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From: "Tony Linde" <ael@star.le.ac.uk>
To: <semantics@us-vo.org>
Subject: Confused
Date: Fri, 8 Nov 2002 19:15:54 -0000
Organization: University of Leicester
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I've seen comments saying that we should use metadata instead of
ontologies, data models instead of ontologies, data models instead of
metadata etc.

So what is the difference? And what do people mean by these terms?

For myself:

Data is information stored electronically.
Metadata is data which describes some other data.
Dataset is a collection of data organised by some principle.
Data model is an ERM of a dataset which describes its underlying
construction.

Ontology is all of the terms and semantic relationships used in some
domain discourse (which may be discovered and stored digitally but not
necessarily).

How about you?

Cheers,
Tony. 

__
Tony Linde                       Phone:  +44 (0)116 223 1292
AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
University of Leicester          Email:  ael@star.le.ac.uk
Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
 

From - Wed Nov 20 10:35:02 2002
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From: "Tony Linde" <ael@star.le.ac.uk>
To: <semantics@us-vo.org>
Subject: Topic Maps: Draft Reference Model
Date: Wed, 20 Nov 2002 09:25:48 -0000
Organization: University of Leicester
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>From the Cover Pages:

ISO SC34 Publishes Draft Reference Model for Topic Maps (RM4TM).

A draft of "The Reference Model for Topic Maps (RM4TM)" has been
published by members of the ISO Topic Map Models Project. The Reference
Model defines an abstract graph structure for the representation of
relationships between subjects, rules for defining Applications of the
Topic Maps paradigm, and rules for processing the information contained
in topic maps. Topic Maps help make "subject" information accessible
from a single location. http://xml.coverpages.org/ni2002-11-16-a.html

Cheers,
Tony. 

__
Tony Linde                       Phone:  +44 (0)116 223 1292
AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
University of Leicester          Email:  ael@star.le.ac.uk
Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
 

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Date: Tue, 12 Nov 2002 11:09:34 -0500
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 Edition + plug-ins for US-$ 890]
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  Has anyone tried out this software?  There is a free version available=20
as well.
Ed

-------- Original Message --------
Subject: Special Offer for Newsletter subscribers: OntoEdit Inference=20
Edition + plug-ins for US-$ 890
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From: Guy Rixon <gtr@ast.cam.ac.uk>
To: Tony Linde <ael@star.le.ac.uk>
cc: semantics@us-vo.org
Subject: RE: Confused
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IIRC, the IVOA process for defining bits of data model (and the process is
semi-formaly defined, but I don't have the URL to hand) goes like:

1. Define the new data-model fragement in UML. Churn, iterate until happy.

2. Represent the model as XMI.

3. Send the XMI to some mailing list at iova.net.

4. Discuss, churn, iterate until consensus or until everybody gives up.

5. Assuming consensus on the object model, produce an XML schema to govern
applications of it.

So, yes, it's a very, very structural thing.  In fact, the output is 100%
structural and semantic stuff can only be included as comments.  As you note,
you can't interrogate this kind of model to learn its semantics.

Thing is, we can do this _now_, whereas the higher-level semantic stuff seems
to depends on tools and techniques that we, the service implementors don't
know (saving the presence of the people on this list who _do_ know this stuff
coz they invented it) and which seem a bit vaporous anyway. (OK, 100% and
condensing, but still not quite there yet.)


On Mon, 11 Nov 2002, Tony Linde wrote:

> I think you're right about it being an implementation issue, Guy. I
> think the confusion arises because, having spent twenty years or more
> with 'data model' being an ERM (or similar) diagram produced before
> implementing a database design, I don't see how it can be used as
> 'metadata' or an 'ontology'.
>
> However, I guess if the model is produced using UML and stored as XMI
> then it could be interrogated.
>
> Is this what the 'data model' people are doing? Specifying a data model
> for VOs that can also be interrogated as metadata? In which case what
> standards are being used for the data model format?
>
> I guess this is a useful way of storing structural metadata with some
> relationship information in the links between 'tables' but I wonder how
> much and what type of information cannot be stored in this way. And is
> it important to what we want to do?
>
> I think the biggest potential problem is that it IS structural. An
> ontology or loosely stored metadata does not mandate how the data itself
> is stored. An important point when many projects are working towards an
> interoperable VO but not using or even based on the same implementation.
> A data model may enforce structures that some people do not want to use.
>
> Hmm, what do others think?
>
> Cheers,
> Tony.
>
> > -----Original Message-----
> > From: Guy Rixon [mailto:gtr@ast.cam.ac.uk]
> > Sent: 10 November 2002 16:28
> > To: Tony Linde
> > Cc: semantics@us-vo.org
> > Subject: Re: Confused
> >
> >
> > Tony,
> >
> > perhaps it's an implementation dispute rather than a definition thing?
> >
> > The IVOA data models are now specified to be expressible
> > using UML.  That is, they only contain relationships "is a"
> > and "has a" (and perhaps "owns" if we distinguish composition
> > from aggregation).  The ontological content is restricted, so
> > much of this modelling can be done with existing tools that
> > support OOA.
> >
> > Conversely, if we use lots of relationships, then we have to
> > use specialised tools from recent ontology research; tools
> > that look vaporous right now.
> >
> > I think your definitions are right.  I also think that many
> > VO folk ignore the ontological theory behind their current
> > modelling because it's not necesary to know the thory to use
> > the technique.
> >
> > On Fri, 8 Nov 2002, Tony Linde wrote:
> >
> > > I've seen comments saying that we should use metadata instead of
> > > ontologies, data models instead of ontologies, data models
> > instead of
> > > metadata etc.
> > >
> > > So what is the difference? And what do people mean by these terms?
> > >
> > > For myself:
> > >
> > > Data is information stored electronically.
> > > Metadata is data which describes some other data.
> > > Dataset is a collection of data organised by some principle. Data
> > > model is an ERM of a dataset which describes its underlying
> > > construction.
> > >
> > > Ontology is all of the terms and semantic relationships
> > used in some
> > > domain discourse (which may be discovered and stored
> > digitally but not
> > > necessarily).
> > >
> > > How about you?
> > >
> > > Cheers,
> > > Tony.
> > >
> > > __
> > > Tony Linde                       Phone:  +44 (0)116 223 1292
> > > AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
> > > Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
> > > University of Leicester          Email:  ael@star.le.ac.uk
> > > Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
> > >
> > >
> > >
> >
> > Guy Rixon 				        gtr@ast.cam.ac.uk
> > Institute of Astronomy   	                Tel: +44-1223-337542
> > Madingley Road, Cambridge, UK, CB3 0HA		Fax:
> > +44-1223-337523
> >
>
>

Guy Rixon 				        gtr@ast.cam.ac.uk
Institute of Astronomy   	                Tel: +44-1223-337542
Madingley Road, Cambridge, UK, CB3 0HA		Fax: +44-1223-337523

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I think you're right about it being an implementation issue, Guy. I
think the confusion arises because, having spent twenty years or more
with 'data model' being an ERM (or similar) diagram produced before
implementing a database design, I don't see how it can be used as
'metadata' or an 'ontology'. 

However, I guess if the model is produced using UML and stored as XMI
then it could be interrogated.

Is this what the 'data model' people are doing? Specifying a data model
for VOs that can also be interrogated as metadata? In which case what
standards are being used for the data model format?

I guess this is a useful way of storing structural metadata with some
relationship information in the links between 'tables' but I wonder how
much and what type of information cannot be stored in this way. And is
it important to what we want to do?

I think the biggest potential problem is that it IS structural. An
ontology or loosely stored metadata does not mandate how the data itself
is stored. An important point when many projects are working towards an
interoperable VO but not using or even based on the same implementation.
A data model may enforce structures that some people do not want to use.

Hmm, what do others think?

Cheers,
Tony. 

> -----Original Message-----
> From: Guy Rixon [mailto:gtr@ast.cam.ac.uk] 
> Sent: 10 November 2002 16:28
> To: Tony Linde
> Cc: semantics@us-vo.org
> Subject: Re: Confused
> 
> 
> Tony,
> 
> perhaps it's an implementation dispute rather than a definition thing?
> 
> The IVOA data models are now specified to be expressible 
> using UML.  That is, they only contain relationships "is a" 
> and "has a" (and perhaps "owns" if we distinguish composition 
> from aggregation).  The ontological content is restricted, so 
> much of this modelling can be done with existing tools that 
> support OOA.
> 
> Conversely, if we use lots of relationships, then we have to 
> use specialised tools from recent ontology research; tools 
> that look vaporous right now.
> 
> I think your definitions are right.  I also think that many 
> VO folk ignore the ontological theory behind their current 
> modelling because it's not necesary to know the thory to use 
> the technique.
> 
> On Fri, 8 Nov 2002, Tony Linde wrote:
> 
> > I've seen comments saying that we should use metadata instead of 
> > ontologies, data models instead of ontologies, data models 
> instead of 
> > metadata etc.
> >
> > So what is the difference? And what do people mean by these terms?
> >
> > For myself:
> >
> > Data is information stored electronically.
> > Metadata is data which describes some other data.
> > Dataset is a collection of data organised by some principle. Data 
> > model is an ERM of a dataset which describes its underlying 
> > construction.
> >
> > Ontology is all of the terms and semantic relationships 
> used in some 
> > domain discourse (which may be discovered and stored 
> digitally but not 
> > necessarily).
> >
> > How about you?
> >
> > Cheers,
> > Tony.
> >
> > __
> > Tony Linde                       Phone:  +44 (0)116 223 1292
> > AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
> > Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
> > University of Leicester          Email:  ael@star.le.ac.uk
> > Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
> >
> >
> >
> 
> Guy Rixon 				        gtr@ast.cam.ac.uk
> Institute of Astronomy   	                Tel: +44-1223-337542
> Madingley Road, Cambridge, UK, CB3 0HA		Fax: 
> +44-1223-337523
> 

From - Mon Nov 11 10:16:56 2002
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From: Guy Rixon <gtr@ast.cam.ac.uk>
To: Tony Linde <ael@star.le.ac.uk>
cc: semantics@us-vo.org
Subject: Re: Confused
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Tony,

perhaps it's an implementation dispute rather than a definition thing?

The IVOA data models are now specified to be expressible using UML.  That is,
they only contain relationships "is a" and "has a" (and perhaps "owns" if we
distinguish composition from aggregation).  The ontological content is
restricted, so much of this modelling can be done with existing tools that
support OOA.

Conversely, if we use lots of relationships, then we have to use specialised
tools from recent ontology research; tools that look vaporous right now.

I think your definitions are right.  I also think that many VO folk ignore the
ontological theory behind their current modelling because it's not necesary to
know the thory to use the technique.

On Fri, 8 Nov 2002, Tony Linde wrote:

> I've seen comments saying that we should use metadata instead of
> ontologies, data models instead of ontologies, data models instead of
> metadata etc.
>
> So what is the difference? And what do people mean by these terms?
>
> For myself:
>
> Data is information stored electronically.
> Metadata is data which describes some other data.
> Dataset is a collection of data organised by some principle.
> Data model is an ERM of a dataset which describes its underlying
> construction.
>
> Ontology is all of the terms and semantic relationships used in some
> domain discourse (which may be discovered and stored digitally but not
> necessarily).
>
> How about you?
>
> Cheers,
> Tony.
>
> __
> Tony Linde                       Phone:  +44 (0)116 223 1292
> AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
> Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
> University of Leicester          Email:  ael@star.le.ac.uk
> Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
>
>
>

Guy Rixon 				        gtr@ast.cam.ac.uk
Institute of Astronomy   	                Tel: +44-1223-337542
Madingley Road, Cambridge, UK, CB3 0HA		Fax: +44-1223-337523

From - Mon Nov 11 14:09:25 2002
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Date: Sun, 10 Nov 2002 09:11:14 -0800
To: <semantics@us-vo.org>
From: Reagan Moore <moore@sdsc.edu>
Subject: Re: Confused
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I would like to add the definitions we are using for these terms in 
the development of knowledge management systems at SDSC:

- data consists of bits (zeros and ones)
- information is a semantic tag that is applied to data (typically a 
name that we assign to selected bits).  We use XML syntax to annotate 
data.
- metadata is the combination of the semantic tag and the associated 
bits (we typically store metadata in a database)
- knowledge is a relationship that is defined on the semantic tags. 
Examples are semantic/logical relationships ("isa" and "hasa"), 
structural/spatial relationships, procedural/temporal relationships.
- a data model is a structural relationship that is applied to data. 
Note that the structural relationships can be manipulated by methods. 
Methods in turn are procedural relationships that can be applied to 
the named structural components of the data model.
- ontologies are structural relationships imposed on semantic labels. 
Usually, the choice of semantic terms, and the choice of 
relationships between the terms are combined in the ontology.  Most 
ontologies focus on semantic/logical relationships.  The result is a 
concept space or a domain map.  When we organize semantic terms using 
procedural relationships, we create a process map that can be used to 
describe workflow systems.  When we organize semantic terms using 
spatial relationships, we create an atlas that can be manipulated by 
a GIS system.

Reagan Moore


>I've seen comments saying that we should use metadata instead of
>ontologies, data models instead of ontologies, data models instead of
>metadata etc.
>
>So what is the difference? And what do people mean by these terms?
>
>For myself:
>
>Data is information stored electronically.
>Metadata is data which describes some other data.
>Dataset is a collection of data organised by some principle.
>Data model is an ERM of a dataset which describes its underlying
>construction.
>
>Ontology is all of the terms and semantic relationships used in some
>domain discourse (which may be discovered and stored digitally but not
>necessarily).
>
>How about you?
>
>Cheers,
>Tony.
>
>__
>Tony Linde                       Phone:  +44 (0)116 223 1292
>AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
>Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
>University of Leicester          Email:  ael@star.le.ac.uk
>Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
>

From - Mon Oct 21 10:06:45 2002
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Date: Fri, 18 Oct 2002 17:24:13 +0100 (GMT Daylight Time)
From: Sean Bechhofer <seanb@cs.man.ac.uk>
To: semantics@us-vo.org
Subject: Re: Use of DAML+OIL/SkiCal and iCalendar in DAML+OIL
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I think I tried to post this a while back, but it didn't seem to come
through....

On Sun, 6 Oct 2002, Alan Rector wrote:

> Tony - Dan, Libby and Greg
>
> Thanks to Tony for bringing the paper to our attention.
>
> A question for the authors...
>
> Most of the issues concern namespaces and equivalence which I
> shall leave to Sean.

> Towards the end of the paper you have an almost throw away comment
> that
>
>     "Another significant problem was the awkward syntax and limited
> expressivity..."
>
> Leaving aside the awkward syntax, I would be curious to know specific
> examples of the  problems with expressivity in your concrete
> task.  The reference to Pat Hayes isn't helpful because I know
> his theoretical position.  The question is, "What happens in practice?"

I too (as an implementor) have struggled with the issue of awkward syntax.
Collaping the richer models down into the RDF triple model makes things
hard (from an implementation point of view) and produces effectively
unreadable syntax (from a user point of view). However, that shouldn't
necessarily be a problem -- rather it's a requirement for good end-user
tools. RDF shouldn't be seen as a human readable syntax, but as a
mechanism for exchange between machines.

As with Alan, I'd be interested in knowing where the expressivity is
insufficient.

In the concluding section, there's a comment:

"Where DAML+oil is used to describe relations between objects in
ontologies written by different authors, connecting the ontologies
involves hypothesising what the author meant by the ontology. A machine
readable DAML+oil ontology does not capture all the aspects of the world
in the area which it claims to represent, and so there is immense
potential for error, still more so when the ontologies are defined in RDF
Schema or Mime directories or other means less precise than DAML+oil."

This is a good point, and one that's present regardless of the
representation used. One of our hypotheses is that the explicit modelling
capabilities of richer languages will help to alleviate the problems of
interpreting the author's original intent.

"Even within a single ontology, the degree of precision that DAML+oil
enables you to describe between objects is in many cases greater than the
degree of precision that you know pertains in those particular
circumstances. This means that arbitrary decisions are made for those
descriptions, leading to errors of interpretation, and, paradoxically, a
reduction in precision, because of the introduction of this random noise."

Again, are there examples of this? The use of a rich language does not
mandate that one has to use all the functionality. We could quite easily
define simple taxonomies (or even a completely flat vocabulary) using D+O.
Indeed, one of our approaches to building models is to do precisely this
-- start out with a simple taxonomic structure and then incrementally
refine this through definition.

Greg later wrote:

>I am sure all these problems are old hat for others and I am surely the
>least qualified to criticize DAML+OIL. After the fact I would say that
>SkiCal just wasn't "hierarchal" enough to make sense in DAML+OIL and I am
>not quite sure what would be, but Alan has asked for a response, maybe we
>can talk a bit about this on Wednesday and I can brush up on the work and
>be more concrete, otherwise I realize that this too is an "argument with
>out evidence".

Looking briefly at the iCal format, it does look to be lacking many
intensionally defined classes, which is the sort of area that D+O is good
at tackling. iCal seems rather to give a kind of top level schema for the
sort of information that you might want to store about events. I think
that where this kind of scenario would benefit is in the modelling of the
vocabulary that is then used to populate that schema. For example, the
kinds of person that may be involved in an event, or the different kinds
of venue where an event may be held.

Cheers,

	Sean

-- 
Sean Bechhofer
seanb@cs.man.ac.uk
http://www.cs.man.ac.uk/~seanb



From - Sun Oct 20 19:22:30 2002
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 2.0b) available]
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-------- Original Message --------
Subject: SMORE - Semantic Markup, Ontology, and RDF Editor (version 
2.0b) available
Date: Wed, 9 Oct 2002 21:05:45 -0700 (PDT)
From: Aditya Kalyanpur <swap_adityak@yahoo.com>
Reply-To: Aditya Kalyanpur <swap_adityak@yahoo.com>
To: gswsg@listserv.gsfc.nasa.gov, www-rdf-interest@w3.org



Hi,
  SMORE - Semantic Markup, Ontology, and RDF Editor
version 2.0b is now available for download. The aim of
this tool is to allow users to markup their documents
in RDF/XML using web ontologies in association
with user-defined terms and elements. For a brief
introduction and download link, please check the
following url:

http://www.mindswap.org/~aditkal/editor.shtml

  Feel free to try the beta version and let me know
your thoughts on it.  

Thanks,
Aditya.

MIND SWAP Research Group (http://www.mindswap.org)
University of Maryland, College Park

__________________________________________________
Do you Yahoo!?
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From - Sun Oct 20 19:22:34 2002
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From: "Tony Linde" <ael@star.le.ac.uk>
To: <semantics@us-vo.org>
Subject: RE: UCDs, metadata and AstroOntology
Date: Thu, 17 Oct 2002 16:53:56 +0100
Organization: University of Leicester
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> If we agree that each column needs a metadata description 
> then where else do we store it?

Does it matter? As long as it accompanies the data (or is easily
accessible), is in a fixed position (eg a section of the VOTable) and
programs know what to do with it (eg provide clickable links from column
name into appropriate place in metadata description), then the column
name need only be reasonable in the context of the table and not in any
wider sense.

I think we need to decide whether UCDs are meant to be column names or
metadata. This will determine how they are developed in the future.
Trying to make them mean both things will make it difficult to decide
their development. 

>From what I've seen, it seems that people want them to be metadata with
relatively simplistic semantic content. In that case, let's forget the
idea of creating rich and meaningful column names and concentrate on
what metadata is required for catalog, table and column data and then
modify VOTable to carry that metadata. CDS can then incorporate the same
ideas into their tools and the column names themselves can be simplified
(or left as they are if that's what is decided).

Cheers,
Tony. 

> -----Original Message-----
> From: owner-semantics@us-vo.org 
> [mailto:owner-semantics@us-vo.org] On Behalf Of Anita Richards
> Sent: 17 October 2002 12:57
> To: semantics@us-vo.org
> Subject: RE: UCDs, metadata and AstroOntology
> 
> 
> 
> > 
> > > ... As I understand it, the UCDs _are_ the meta data
> > > for each column but they are dynamic, ie built up out of 
> > > atoms from the column or the header or possibly higher levels 
> > > depending on the query.
> > 
> > I'm not sure I understand what you mean by them being 
> dynamic. Once a 
> > UCD is assigned to a column, it is fixed, n'est-ce pas?
> 
> I was using 'UCD' to mean metadata built up out of atoms, and 
> I ws thinking that if some of the metadata is in the header 
> and some is identifiying column labels then the relevant UCD 
> for a particular search might contain more or less atoms 
> strung together.  But, yes, the individual atoms have to be 
> fixed I hope!
> 
> ......
> > 
> > As you said above, UCDs are metadata, not column names, so 
> why not use 
> > the column names as the column names and store the metadata 
> separately 
> > in a form that makes it easy to access and use.
> 
> Because the original column names are often very obscure?  Or 
> are we at cross purposes, is Tony assuming that we have 
> already replaced every original column label that says 
> 'brightness' or 'Mags' or ??? with one saying 'PHOT"? etc?  
> If we agree that each column needs a metadata description 
> then where else do we store it?
> 
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
> Dr. Anita M. S. Richards, AVO Astronomer
> MERLIN/VLBI National Facility, University of Manchester, 
> Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, 
> U.K.           
> tel +44 (0)1477 572683 (direct); 571321 (switchboard); 571618 (fax). 	
> 
> 

From - Sun Oct 20 19:22:34 2002
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From: Anita Richards <amsr@jb.man.ac.uk>
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> 
> > ... As I understand it, the UCDs _are_ the meta data 
> > for each column but they are dynamic, ie built up out of 
> > atoms from the column or the header or possibly higher levels 
> > depending on the query.
> 
> I'm not sure I understand what you mean by them being dynamic. Once a
> UCD is assigned to a column, it is fixed, n'est-ce pas?

I was using 'UCD' to mean metadata built up out of atoms, and I ws
thinking that if some of the metadata is in the header and some is
identifiying column labels then the relevant UCD for a particular search
might contain more or less atoms strung together.  But, yes, the
individual atoms have to be fixed I hope!

......
> 
> As you said above, UCDs are metadata, not column names, so why not use
> the column names as the column names and store the metadata separately
> in a form that makes it easy to access and use.

Because the original column names are often very obscure?  Or are we at
cross purposes, is Tony assuming that we have already replaced every
original column label that says 'brightness' or 'Mags' or ??? with one
saying 'PHOT"? etc?  
If we agree that each column needs a metadata description then where else
do we store it?

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
Dr. Anita M. S. Richards, AVO Astronomer
MERLIN/VLBI National Facility, University of Manchester, 
Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, U.K.           
tel +44 (0)1477 572683 (direct); 571321 (switchboard); 571618 (fax). 	


From - Sun Oct 20 19:22:34 2002
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From: "Tony Linde" <ael@star.le.ac.uk>
To: <semantics@us-vo.org>
Subject: RE: UCDs, metadata and AstroOntology
Date: Thu, 17 Oct 2002 11:20:19 +0100
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> -----Original Message-----
> From: owner-semantics@us-vo.org 
> [mailto:owner-semantics@us-vo.org] On Behalf Of Anita Richards
> Sent: 16 October 2002 14:38
...
> In practice, catalogues might contain any information 
> anywhere...

I guess this relates to 'annotation' - the process of adding metadata to
articles, data tables etc. A big job but one that CDS does now and which
the bioinformaticians have obviously developed various bits of software
to help with.

> ... As I understand it, the UCDs _are_ the meta data 
> for each column but they are dynamic, ie built up out of 
> atoms from the column or the header or possibly higher levels 
> depending on the query.

I'm not sure I understand what you mean by them being dynamic. Once a
UCD is assigned to a column, it is fixed, n'est-ce pas?

> -----Original Message-----
> From: Guy Rixon [mailto:gtr@ast.cam.ac.uk] 
> Sent: 16 October 2002 15:48
...
> ... For me, UCDs ARE 
> metadata but ARE NOT names.

I think I'm getting the message now :)

And I guess I should have realised that from the name: unified column
DESCRIPTORS.

> I propose that a programme reading, say, a VOTable should be 
> able to find and use columns of that table for which it knows 
> the semantics independently of some ontological service.  

Which is basically saying that all or some of the metadata should be
embedded in the VOTable, so any piece of data should carry its metadata
around with it. I have no argument with that, though I guess in some
cases it'll be better not to (cannot think of an example offhand).

> 1. To make the parsing self-contained.  Collating bits of 
> metadata from many parts of a document makes a programme complicated.

I don't think I agree with that. To me, parsing is always more difficult
than looking in a specific place for a specific piece of data. If
metadata is carried in a specific place in the VOTable, it'll be
relatively easy for a program to look for it there and use it.

As you said above, UCDs are metadata, not column names, so why not use
the column names as the column names and store the metadata separately
in a form that makes it easy to access and use.

> -----Original Message-----
> From: Ray Plante [mailto:rplante@poplar.ncsa.uiuc.edu] 
> Sent: 16 October 2002 16:05
...
> Last week, a number of us attended a workshop at SAO on 
> developing data models for the VO...

Do you have a write-up on any papers presented or outcomes of the
meeting?

> As many of you know, I'm partial to a data-model-based metadata 
> definition;

I'm not sure what you mean by 'data-model-based metadata', Ray? Can you
explain this more or point to any papers you've written that expalin it?
Thanks.

Cheers,
Tony. 
__
Tony Linde                       Phone:  +44 (0)116 223 1292
AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
University of Leicester          Email:  ael@star.le.ac.uk
Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
 

From - Sun Oct 20 19:22:34 2002
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From: "Tony Linde" <ael@star.le.ac.uk>
To: <semantics@us-vo.org>
Subject: Nature feature: Putting a name on it 
Date: Thu, 17 Oct 2002 09:44:13 +0100
Organization: University of Leicester
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Feature article in Nature about gene annotation:

http://www.nature.com/cgi-taf/DynaPage.taf?file=/nature/journal/v419/n69
08/full/419755a_fs.html

I guess if astronomers want to get serious about AstroOntology, we're
going to need a similar degree of effort in automating the process of
annotation. Or are the two fields so different that a different approach
is called for?

Cheers,
Tony. 
__
Tony Linde                       Phone:  +44 (0)116 223 1292
AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
University of Leicester          Email:  ael@star.le.ac.uk
Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
 

From - Sun Oct  6 22:11:25 2002
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Tony - Dan, Libby and Greg

Thanks to Tony for bringing the paper to our attention.

A question for the authors...

Most of the issues concern namespaces and equivalence which I
shall leave to Sean.

Towards the end of the paper you have an almost throw away comment
that

    "Another significant problem was the awkward syntax and limited
expressivity..."

Leaving aside the awkward syntax, I would be curious to know specific
examples of the  problems with expressivity in your concrete
task.  The reference to Pat Hayes isn't helpful because I know
his theoretical position.  The question is, "What happens in practice?"

I know which things have caused problems in  building
biomedical ontologies.  I think it is very important to know, concretely,
what causes  problems to others in other fields.
Otherwise we are arguing without evidence.

Thanks

Alan

--
Alan L Rector
Professor of Medical Informatics
Department of Computer Science
University of Manchester
Manchester M13 9PL, UK
TEL: +44-161-275-6188/6239/7183
FAX: +44-161-275-6204
email: rector@cs.man.ac.uk
web: www.cs.man.ac.uk/mig
        www.opengalen.org




Tony Linde wrote:

> Ran across this paper at:
>   http://www.ilrt.bristol.ac.uk/discovery/2002/03/skical-daml/
>
> It deals with applying DAML+OIL approach to an existing application
> (SkiCal). I'd be interested to get Sean's comments on how they
> approached the problem and their conclusions about DAML+OIL.
>
> (I'll be glad when OWL takes over - it's easier to type!)
>
> Cheers,
> Tony.
>
> __
> Tony Linde                       Phone:  +44 (0)116 223 1292
> AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
> Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
> University of Leicester          Email:  tol@star.le.ac.uk
> Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
>



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Subject: Re: UMLS (Unified Medical Language System)
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Roy

The UMLS is a major resource managed by the US National Library of
Medicine.  It provides a cross reference of most of the major medical
and many bio ontologies.  Lots of information available on the web.

It is probably more a resource to link to and develop from than develop.

It's free, but there is a fairly complex licensing agreement because
much of the material contained is subject to various copyright agreements.

What can be re-used depends on the category of IP agreement in the
license.

Regards

Alan


Roy Williams wrote:

> I saw a link to this in my email this morning, the Unified Medical
> Language System (*), a compendium of different vocabularies about
> medicine. It is sorted and classified in different ways, and has
> licenced software to go with it.
>
> "The Metathesaurus preserves the meanings, attributes, hierarchical
> connections, and other relationships between terms present in its source
> vocabularies, while adding certain basic information about each of its
> concepts and establishing synonymy and new relationships between
> concepts and terms from different source vocabularies.
>
> METATHESAURUS SIZE: 113,699,627 BYTES.
> CONCEPT UNIQUE IDENTIFIERS (CUIs): 729,248
> SYNONYMS: 1,598,176
>
> I wonder if this is something we could develop as a VO resource? There
> are varous candidate vocabularies that we could uses as a basis listed
> below(**).
>
> It looks like NIH have spent a lot of resouces on UMLS, and I wonder
> exactly how people use it, and more importantly for us, how such a thing
> might help the VO community?
>
> Roy Williams
> ---------
> Caltech Center for Advanced Computing Research
> mail    roy@cacr.caltech.edu
> voice   +1 626 395 3670
>
> -----------------------------------------------
> (*) The UMLS system is explained here:
> http://www.nlm.nih.gov/research/umls/META2.HTML
>
> This is a list of all the vocaularies that UMLS has subsumed
> http://www.nlm.nih.gov/research/umls/METAA1.HTML
>
> This is a list of "semantic types"
> http://umlsinfo.nlm.nih.gov/styfile.html
>
> -------------------------
> (**) Some Astronomy Vocabularies
> UCD vocabulary
> http://vizier.u-strasbg.fr/doc/UCD.htx
>
> Astronomy Thesaurus
> http://msowww.anu.edu.au/library/thesaurus/
>
> American Institute of Physics
> http://www.aip.org/pacs/pacs01/pacs0190.htm

--
Alan L Rector
Professor of Medical Informatics
Department of Computer Science
University of Manchester
Manchester M13 9PL, UK
TEL: +44-161-275-6188/6239/7183
FAX: +44-161-275-6204
email: rector@cs.man.ac.uk
web: www.cs.man.ac.uk/mig
        www.opengalen.org


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Thanks to Carole and Sean, I think I understand what I was trying to say
earlier better now....


> Of course in biology there are different classifications and
> definitions -- there is no standard definition for what a gene is for
> example. DAML+OIL allows multiple definitions, and will report on
> definitions that are inconsistent. What you do then is an interesting
> story. And it depends on what you want to use the ontology / taxonomy
> for.

It is much worse in astronomy though because no-one dies or even sues if
we define something in ten different ways...  So I do not think the people
constructing ontologies should have to sort out genuine inconsistencies
(just avoid accidentally creating more ourselves!)

> So, onto the subject of contradictions and inconsistency. I say that
> all Widgets are blue, while you think that Widgets are red. So in our
> ontology, I say:
> 
>   Widget -> colour blue
> 
> and you say
> 
>   Widget -> colour red
> 
> If we also have some constraints that say that blue and red are
> mutually exclusive, then we have arrived at a contradiction. 

This implies that we should avoid mutually exclusive definitions within an
ontology for astronomy, because people can disagree about definitions, or
definitions can change with time.  For example, an optical astronomer
might say that all stars with an emission line at 500 nm is a green fairy,
and those with a line at 700 nm are red fairies.  A radio astromoner might
then use an insensitive survey to find that only red fairies had radio
emission and classify all radio stars as red fairies.  However if green
fairies do have weak radio emission, some radio stars in a more sensitive
survey could be misclassified.

So, suppose a star cannot actually be both, we (as in the ontology
authors) do not want to have to decide, and we do not want to throw out
the information either.

I suppose this is really the 'individual' case, but there are also cases
of contradictory definitions of precisely measured properties, e.g.
whether a red fairy is a variable star with a period of <400 days or <350
days and a green fairy has a period of >400 or >350 days.....

But I think the implications for an ontology user are the same: if I was
searching for all the green fairies in a galaxy, I would want a warning
about those which were classified as red and as green in radio and optical
catalogues respectively as well as those which were classified according
to an ambiguous definition (periods of around 375 days).

What I think would be useful is if we could constrain properties to be
"contradictory" as a description, of perhaps just as "linked", so that any
query which involved returning a description or list of (a) green
fairy(ies)  would automatically note any also classified as red....

> One solution to this is to use the classification as a "conceptual
> coat rack" and hang "extralogical" information off it. This is the
> kind of thing that the RuleML initiative is aimed at. This then allows
> us to state things about OWL classes that are not necessarily part of
> the ontological or intensional definition of the class, but which we
> want to make available to applications.

Um, is that similar to what I am suggesting above?  



- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
Dr. Anita M. S. Richards, AVO Astronomer
MERLIN/VLBI National Facility, University of Manchester, 
Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, U.K.           
tel +44 (0)1477 572683 (direct); 571321 (switchboard); 571618 (fax). 	


From - Sun Sep 29 11:41:18 2002
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I saw a link to this in my email this morning, the Unified Medical
Language System (*), a compendium of different vocabularies about
medicine. It is sorted and classified in different ways, and has
licenced software to go with it.

"The Metathesaurus preserves the meanings, attributes, hierarchical
connections, and other relationships between terms present in its source
vocabularies, while adding certain basic information about each of its
concepts and establishing synonymy and new relationships between
concepts and terms from different source vocabularies.

METATHESAURUS SIZE: 113,699,627 BYTES.
CONCEPT UNIQUE IDENTIFIERS (CUIs): 729,248
SYNONYMS: 1,598,176

I wonder if this is something we could develop as a VO resource? There
are varous candidate vocabularies that we could uses as a basis listed
below(**).

It looks like NIH have spent a lot of resouces on UMLS, and I wonder
exactly how people use it, and more importantly for us, how such a thing
might help the VO community?

Roy Williams
---------
Caltech Center for Advanced Computing Research
mail    roy@cacr.caltech.edu
voice   +1 626 395 3670


-----------------------------------------------
(*) The UMLS system is explained here:
http://www.nlm.nih.gov/research/umls/META2.HTML

This is a list of all the vocaularies that UMLS has subsumed
http://www.nlm.nih.gov/research/umls/METAA1.HTML

This is a list of "semantic types"
http://umlsinfo.nlm.nih.gov/styfile.html

-------------------------
(**) Some Astronomy Vocabularies
UCD vocabulary
http://vizier.u-strasbg.fr/doc/UCD.htx

Astronomy Thesaurus
http://msowww.anu.edu.au/library/thesaurus/

American Institute of Physics
http://www.aip.org/pacs/pacs01/pacs0190.htm






From - Fri Sep 27 15:59:37 2002
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From: "Tony Linde" <tol@star.le.ac.uk>
To: <semantics@us-vo.org>
Subject: Taxonomy issues
Date: Fri, 27 Sep 2002 14:44:49 +0100
Organization: University of Leicester
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A letter in Nature today (Vol 419, 26 Sept, p 337) raises the concern
that creating a 'taxonomy portal' (taxonomy in the sense of species
classification) could lead to the imposition of a standard view of what
an object is or is not, whereas, at the moment, two authors can review
the same evidence and come to different conclusions about the
classification of a species.

I think this is an issue that will come to the fore in the creation of
an AstroOntology which might sit at the core of our VO's registries and
workflow engines. 

Is it possible using DAML+OIL or equivalents to classify the same object
as two apparently contradictory things? I assume not. But both authors
must be allowed to classify an object as different things. So how is
this issue resolved?

Cheers,
Tony. 

__
Tony Linde                       Phone:  +44 (0)116 223 1292
AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
University of Leicester          Email:  tol@star.le.ac.uk
Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
 

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Subject: Re: Taxonomy issues
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Addendum

Some groups in the medical area draw the following distinctions which may be
helpful

    "Terming" - finding the linguistic unit corresponding to a concept
    "coding" - finding the concept in a logical sense
    "classification" - classifying it according to some specific purpose, usually
            an externally imposed set of classes from WHO, a funding body, etc.
    "Grouping" - an even more arbitrary grouping together of classes and codes,
            usually tied to management, payment, or planning, which are typically
            linked by their relative cost/expenditure/resource implications rather than
            any affinity within the domain of discourse - e.g. uncomplicated
            appendicectomy and brief hospitalisation for pneumnia might find themselves
            in the same 'group' because they both involve roughly 3 days hospitalisation.

Alan


Alan Rector wrote:

> Anita, Carole and all
>
> The medical world draws a sharp distinction between "classifications" and "conceptual
> models".  "There are many reasons for creating classifications, e.g. epidemiological
> studies, payment for procedures, bibliographic retrieval, etc.  The classification
> criteri may be logical or pragmatic, e.g. many epidemiological classifications have
> more to do with the history of what diseases were important in 1900 than they
> do with any logical structure of our understanding today -- but that is still how
> they
> must be reported to the World Health Organisation for international statistics.
>
> "Logic based ontologies" (just "ontologies" for short) on the other hand are, or
> should be, purely logical.  The hierarchy is based on pure subsumption,. i.e.
> necessary implication.   If well built, they will be likely to exhibit certain sorts
> of emergent behaviour - i.e. you can't predict all the logical consequences from any
> rich set of relationships. However, they will be lawful (indeed logical), and changes
> will have predictable consequences - this is very important in the issue of revisions
> which you allude to.
>
> On the other hand, the source of the information in the logical structure may require
>
> domain experts - e.g. astronomers - or may be induced (we hope) from various corpora.
>
> There is a trade-off between logical rigour and match to pragmatic behaviour.
> How you manage that trade off depends on the applications.  For clinical
> decision making a high degree of rigour is required.  For many information
> retrieval tasks, pragmatic behaviour is more important.
>
> As systems scale up, the trade-offs become more problematic because
> humans' memory capacity is exceeded so we can't remember the
> idiosyncrasies.  On the one hand, non-logical behaviour becomes awkward
> because it gives rise to increasing numbers of exceptions to be dealt by
> any software operation; on the other, our ability to construct fully
> logical structures without relying on emergent behaviour decreases.
>
> Our belief is that least one important task is to provide tools that make
> easier the building of logical ontologies,
> or if you prefer of logical views of conceptual representations -which
> may have many and diverse origins, emergent or a priori.
>
> Regards
>
> Alan
>
> --
> Alan L Rector
> Professor of Medical Informatics
> Department of Computer Science
> University of Manchester
> Manchester M13 9PL, UK
> TEL: +44-161-275-6188/6239/7183
> FAX: +44-161-275-6204
> email: rector@cs.man.ac.uk
> web: www.cs.man.ac.uk/mig
>         www.opengalen.org
>
> Carole Goble wrote:
>
> > Anita
> >
> > > >
> > > > A great advantage of an emergent behaviour system is that the computers do
> > > > the work, and there is no need to hire a librarian who is also an expert in
> > > > astronomy.
> > >
> >
> > In fact it isn't true at all in my opinion. Emergent behaviours need just as much
> > effort. It also depends what kind of decision making you are doing on the
> > results. If its for some search tool used by a person you may not care if its is
> > screwed or odd; if its the basis of an automated decision procedure for composing
> > some web services or steering a simulation you probably do care.
> >
> > >
> > > True up to a point, but the emerging system will need an overhaul every so
> > > often.  The CDS allocate UCDs automatically to new catalogues, which
> > > works very well but occasionally something inappropriate slips in and then
> > > propagates, so a periodic review by someone who is indeed both a librarian
> > > and has a wide knowledge of astronomy is going to be required.
> > >
> >
> > Emergent behaviour needs reasoning perhaps more than a priori schemes in order to
> > identify inconsistencies so you can do something about them. Inconsistencies may
> > well be represented -- which leads to diverging ontologies with some common and
> > some alternatives, which means effectively handling different ontologies with
> > varying degrees of ontological commitment. The point here is that to be ignorant
> > or oblivious of inconsistencies is undesirable.
> >
> > The idea that there are two different worlds - emergent and a priori -- is naive
> > and a false.  The semantic web effort is based on the merging of both approaches.
> > hence all the effort in ontology learning.
> >
> > Of course in biology there are different classifications and definitions -- there
> > is no standard definition for what a gene is for example. DAML+OIL allows
> > multiple definitions, and will report on definitions that are inconsistent. What
> > you do then is an interesting story. And it depends on what you want to use the
> > ontology / taxonomy for.
> >
> > My colleague Sean Bechhofer offers these insights below.   A key point he makes
> > is: are you talking about individuals or concepts? Some of the examples seem to
> > confuse the two. Ontologies are about concepts. Knowledge bases are about
> > individuals. They are different spaces.
> >
> > Cheers
> >
> > Carole
> >
> > Sean writes:
> >
> > Quick answer:
> >
> > It depends.
> >
> > Slightly longer answer:
> >
> > It depends on what you mean by "classifying objects".
> >
> > Even longer answer:
> >
> > [Apologies for introducing some technical stuff here, but I think you
> > have to understand exactly what classification in OWL means in order
> > to explain this -- I will use "OWL" rather than DAML+OIL as it's
> > likely to become the standard and it's easier to type :-). Also
> > apologies if at any point I'm entering into Grandma/egg sucking
> > territory.]
> >
> > OWL allows us to define classes of objects and possibly apply
> > reasoning techniques to discover relationships between those classes
> > of objects. An interpretation of an OWL ontology maps the classes in
> > the ontology to collections of objects in the domain (the instances of
> > the class). We can then do reasoning over the ontology because we have
> > a precise and unambiguous interpretation of what it *means* when we
> > form a composite class description using the constructors in the
> > language.
> >
> > So, for example, if I talk about the class (Cat or Dog) I know
> > *exactly* what the interpretation of this is -- it is all the
> > instances in the domain that are either instances of the class Cat or
> > the class Dog. The reasoning that we perform about class subsumptions
> > is then based on those interpretations. Essentially, if we can show
> > that in *any* interpretation of the ontology, it must be the case that
> > any instance of B must be an instance of A, then we can deduce that B
> > is a subclass of A. This, in general, is what we (i.e. myself and my
> > colleagues) tend to mean when we talk about classification -- it's the
> > organisation of *classes* into a hierarchy using class subsumption.
> >
> > Once we have defined an OWL ontology, the relationships between the
> > classes in the ontology are then not "up for discussion" -- the
> > semantics tells us precisely when classes will subsume, and when they
> > will not. (This all assumes, of course that you buy into the
> > underlying semantics of OWL. You can choose not to, of course and then
> > interpret the classes in whatever way you choose, but if you do that
> > then this discussion is not for you anyway.). The ontology represents
> > some kind of indefeasible state of the world. If I want to use your
> > ontology, then I have to make a commitment to believing the way that
> > you have structured the world -- that's what using ontologies does for
> > us. It provides the shared conceptualisation. With a language like
> > OWL, not only do we get shared *vocabulary*, but we also get explicit
> > descriptions of what we mean. If I say in my ontology that (I use a
> > non-astronomical example here for two reasons: a) it helps to avoid
> > technical nit-picking; and more importantly b) I know nothing about
> > astronomy :-)
> >
> >   CatLover == Person with more than 3 Cats
> >
> > then I'm being explicit here about what I mean. You may disagree and
> > say "oh no, a cat lover doesn't have to *have* lots of cats, they just
> > have to love them". However, at this point, we can now discuss the
> > definition and possibly refine it. The key point is that rather than
> > encoding the characteristics of the class in the name or some
> > documentation as happens in traditional controlled vocabularies, we
> > are providing a "machine interpretable" description, which will allow
> > us to make inferences about the classes.
> >
> > So, onto the subject of contradictions and inconsistency. I say that
> > all Widgets are blue, while you think that Widgets are red. So in our
> > ontology, I say:
> >
> >   Widget -> colour blue
> >
> > and you say
> >
> >   Widget -> colour red
> >
> > If we also have some constraints that say that blue and red are
> > mutually exclusive, then we have arrived at a contradiction. It is
> > simply *not possible* for anything to meet the criteria that we have
> > said must hold for something to be an instance of the class Widget, so
> > the class is inconsistent. The reasoner will be able to tell us
> > this. If, after "full and frank discussions", we still maintain these
> > views, then it's simply the case that we do *not* share a common
> > conceptualisation of our domain. What I mean by Widget is different to
> > what you mean by Widget. At this point we either go our separate ways,
> > or alternatively say nothing in the ontology about the colour of
> > Widgets, which although now less detailed, now reflects our *shared*
> > understanding.
> >
> > Alternatively, we might have different views on the same class. A
> > classic example here is that of the Triangle. I might define a
> > Triangle as being a polygon with three sides. You say its a polygon
> > with three angles. These are, in fact perfectly acceptable (and
> > mutually consistent) alternative definitions for the class of
> > Triangles. OWL allows us to supply such alternative definitions, and
> > the reasoner will tell us when these definitions are consistent and
> > when they are not.
> >
> > One solution to this is to use the classification as a "conceptual
> > coat rack" and hang "extralogical" information off it. This is the
> > kind of thing that the RuleML initiative is aimed at. This then allows
> > us to state things about OWL classes that are not necessarily part of
> > the ontological or intensional definition of the class, but which we
> > want to make available to applications.
> >
> > If when you talk about "classifying objects", you actually mean
> > describing individuals, then the situation is slightly different. The
> > usual picture (from the Description Logic perspective, which has
> > strongly influenced the web ontology language work) is that we have an
> > ontology (or "T-Box" or "schema") that describes the classes of the
> > domain (as above). We then have a collection of instances (or "A-box")
> > along with information describing the properties that particular
> > individuals have. There is a slight blurring of these worlds due to
> > some of the constructors in OWL, but it's worth thinking about it this
> > way.
> >
> > Now once we have our schema or ontology fixed, we can make assertions
> > about objects in the world. You might think that star Beta-X-17 is a
> > Red Dwarf. I might say it's a Green Fairy (is my lack of astronomical
> > knowledge showing??? :-). Let us assume that these two assertions are
> > contradictory. However this is now a disagreement about the properties
> > of a particular *individual*, rather than a disagreement about the
> > properties of the classes in the ontology.
> >
> > An analogy is that of database and schema. We may agree on the schema
> > of our database (people have names, addresses and so on), but disagree
> > on who lives at No.14 Acacia Avenue. This is an discrepancy at the
> > data level (that we may want to be informed about), but does not
> > change the fact that we agree about the general way the world fits
> > together.
> >
> > So in this case, resolving the discrepancy concerning our different
> > descriptions of Beta-X-17 is not an *ontology* issue, rather an issue
> > about the *use* of that ontology.
> >
> > This problem is not exclusive to OWL -- we could easily have
> > contradictory descriptions of Beta-X-17 using some controlled
> > vocabulary or terminology. I guess the interesting thing here though
> > is that the richer language allows us to spot that there really *is* a
> > contradiction between our opinions. Indeed, allowing contradictory
> > descriptions of individuals is key to supporting the Semantic Web --
> > it certainly will not be the case that all the information out there
> > will agree!
> >
> > Cheers,
> >
> >         Sean
> > --
> > Sean Bechhofer
> > seanb@cs.man.ac.uk
> > http://www.cs.man.ac.uk/~seanb
> >
> > >
> > > best wishes
> > >
> > > Anita
> > >
> > > - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> > > Dr. Anita M. S. Richards, AVO Astronomer
> > > MERLIN/VLBI National Facility, University of Manchester,
> > > Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, U.K.
> > > tel +44 (0)1477 572683 (direct); 571321 (switchboard); 571618 (fax).

--
Alan L Rector
Professor of Medical Informatics
Department of Computer Science
University of Manchester
Manchester M13 9PL, UK
TEL: +44-161-275-6188/6239/7183
FAX: +44-161-275-6204
email: rector@cs.man.ac.uk
web: www.cs.man.ac.uk/mig
        www.opengalen.org


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Anita, Carole and all

The medical world draws a sharp distinction between "classifications" and "conceptual
models".  "There are many reasons for creating classifications, e.g. epidemiological
studies, payment for procedures, bibliographic retrieval, etc.  The classification
criteri may be logical or pragmatic, e.g. many epidemiological classifications have
more to do with the history of what diseases were important in 1900 than they
do with any logical structure of our understanding today -- but that is still how
they
must be reported to the World Health Organisation for international statistics.

"Logic based ontologies" (just "ontologies" for short) on the other hand are, or
should be, purely logical.  The hierarchy is based on pure subsumption,. i.e.
necessary implication.   If well built, they will be likely to exhibit certain sorts
of emergent behaviour - i.e. you can't predict all the logical consequences from any
rich set of relationships. However, they will be lawful (indeed logical), and changes
will have predictable consequences - this is very important in the issue of revisions
which you allude to.

On the other hand, the source of the information in the logical structure may require

domain experts - e.g. astronomers - or may be induced (we hope) from various corpora.

There is a trade-off between logical rigour and match to pragmatic behaviour.
How you manage that trade off depends on the applications.  For clinical
decision making a high degree of rigour is required.  For many information
retrieval tasks, pragmatic behaviour is more important.

As systems scale up, the trade-offs become more problematic because
humans' memory capacity is exceeded so we can't remember the
idiosyncrasies.  On the one hand, non-logical behaviour becomes awkward
because it gives rise to increasing numbers of exceptions to be dealt by
any software operation; on the other, our ability to construct fully
logical structures without relying on emergent behaviour decreases.

Our belief is that least one important task is to provide tools that make
easier the building of logical ontologies,
or if you prefer of logical views of conceptual representations -which
may have many and diverse origins, emergent or a priori.

Regards

Alan

--
Alan L Rector
Professor of Medical Informatics
Department of Computer Science
University of Manchester
Manchester M13 9PL, UK
TEL: +44-161-275-6188/6239/7183
FAX: +44-161-275-6204
email: rector@cs.man.ac.uk
web: www.cs.man.ac.uk/mig
        www.opengalen.org



Carole Goble wrote:

> Anita
>
> > >
> > > A great advantage of an emergent behaviour system is that the computers do
> > > the work, and there is no need to hire a librarian who is also an expert in
> > > astronomy.
> >
>
> In fact it isn't true at all in my opinion. Emergent behaviours need just as much
> effort. It also depends what kind of decision making you are doing on the
> results. If its for some search tool used by a person you may not care if its is
> screwed or odd; if its the basis of an automated decision procedure for composing
> some web services or steering a simulation you probably do care.
>
> >
> > True up to a point, but the emerging system will need an overhaul every so
> > often.  The CDS allocate UCDs automatically to new catalogues, which
> > works very well but occasionally something inappropriate slips in and then
> > propagates, so a periodic review by someone who is indeed both a librarian
> > and has a wide knowledge of astronomy is going to be required.
> >
>
> Emergent behaviour needs reasoning perhaps more than a priori schemes in order to
> identify inconsistencies so you can do something about them. Inconsistencies may
> well be represented -- which leads to diverging ontologies with some common and
> some alternatives, which means effectively handling different ontologies with
> varying degrees of ontological commitment. The point here is that to be ignorant
> or oblivious of inconsistencies is undesirable.
>
> The idea that there are two different worlds - emergent and a priori -- is naive
> and a false.  The semantic web effort is based on the merging of both approaches.
> hence all the effort in ontology learning.
>
> Of course in biology there are different classifications and definitions -- there
> is no standard definition for what a gene is for example. DAML+OIL allows
> multiple definitions, and will report on definitions that are inconsistent. What
> you do then is an interesting story. And it depends on what you want to use the
> ontology / taxonomy for.
>
> My colleague Sean Bechhofer offers these insights below.   A key point he makes
> is: are you talking about individuals or concepts? Some of the examples seem to
> confuse the two. Ontologies are about concepts. Knowledge bases are about
> individuals. They are different spaces.
>
> Cheers
>
> Carole
>
> Sean writes:
>
> Quick answer:
>
> It depends.
>
> Slightly longer answer:
>
> It depends on what you mean by "classifying objects".
>
> Even longer answer:
>
> [Apologies for introducing some technical stuff here, but I think you
> have to understand exactly what classification in OWL means in order
> to explain this -- I will use "OWL" rather than DAML+OIL as it's
> likely to become the standard and it's easier to type :-). Also
> apologies if at any point I'm entering into Grandma/egg sucking
> territory.]
>
> OWL allows us to define classes of objects and possibly apply
> reasoning techniques to discover relationships between those classes
> of objects. An interpretation of an OWL ontology maps the classes in
> the ontology to collections of objects in the domain (the instances of
> the class). We can then do reasoning over the ontology because we have
> a precise and unambiguous interpretation of what it *means* when we
> form a composite class description using the constructors in the
> language.
>
> So, for example, if I talk about the class (Cat or Dog) I know
> *exactly* what the interpretation of this is -- it is all the
> instances in the domain that are either instances of the class Cat or
> the class Dog. The reasoning that we perform about class subsumptions
> is then based on those interpretations. Essentially, if we can show
> that in *any* interpretation of the ontology, it must be the case that
> any instance of B must be an instance of A, then we can deduce that B
> is a subclass of A. This, in general, is what we (i.e. myself and my
> colleagues) tend to mean when we talk about classification -- it's the
> organisation of *classes* into a hierarchy using class subsumption.
>
> Once we have defined an OWL ontology, the relationships between the
> classes in the ontology are then not "up for discussion" -- the
> semantics tells us precisely when classes will subsume, and when they
> will not. (This all assumes, of course that you buy into the
> underlying semantics of OWL. You can choose not to, of course and then
> interpret the classes in whatever way you choose, but if you do that
> then this discussion is not for you anyway.). The ontology represents
> some kind of indefeasible state of the world. If I want to use your
> ontology, then I have to make a commitment to believing the way that
> you have structured the world -- that's what using ontologies does for
> us. It provides the shared conceptualisation. With a language like
> OWL, not only do we get shared *vocabulary*, but we also get explicit
> descriptions of what we mean. If I say in my ontology that (I use a
> non-astronomical example here for two reasons: a) it helps to avoid
> technical nit-picking; and more importantly b) I know nothing about
> astronomy :-)
>
>   CatLover == Person with more than 3 Cats
>
> then I'm being explicit here about what I mean. You may disagree and
> say "oh no, a cat lover doesn't have to *have* lots of cats, they just
> have to love them". However, at this point, we can now discuss the
> definition and possibly refine it. The key point is that rather than
> encoding the characteristics of the class in the name or some
> documentation as happens in traditional controlled vocabularies, we
> are providing a "machine interpretable" description, which will allow
> us to make inferences about the classes.
>
> So, onto the subject of contradictions and inconsistency. I say that
> all Widgets are blue, while you think that Widgets are red. So in our
> ontology, I say:
>
>   Widget -> colour blue
>
> and you say
>
>   Widget -> colour red
>
> If we also have some constraints that say that blue and red are
> mutually exclusive, then we have arrived at a contradiction. It is
> simply *not possible* for anything to meet the criteria that we have
> said must hold for something to be an instance of the class Widget, so
> the class is inconsistent. The reasoner will be able to tell us
> this. If, after "full and frank discussions", we still maintain these
> views, then it's simply the case that we do *not* share a common
> conceptualisation of our domain. What I mean by Widget is different to
> what you mean by Widget. At this point we either go our separate ways,
> or alternatively say nothing in the ontology about the colour of
> Widgets, which although now less detailed, now reflects our *shared*
> understanding.
>
> Alternatively, we might have different views on the same class. A
> classic example here is that of the Triangle. I might define a
> Triangle as being a polygon with three sides. You say its a polygon
> with three angles. These are, in fact perfectly acceptable (and
> mutually consistent) alternative definitions for the class of
> Triangles. OWL allows us to supply such alternative definitions, and
> the reasoner will tell us when these definitions are consistent and
> when they are not.
>
> One solution to this is to use the classification as a "conceptual
> coat rack" and hang "extralogical" information off it. This is the
> kind of thing that the RuleML initiative is aimed at. This then allows
> us to state things about OWL classes that are not necessarily part of
> the ontological or intensional definition of the class, but which we
> want to make available to applications.
>
> If when you talk about "classifying objects", you actually mean
> describing individuals, then the situation is slightly different. The
> usual picture (from the Description Logic perspective, which has
> strongly influenced the web ontology language work) is that we have an
> ontology (or "T-Box" or "schema") that describes the classes of the
> domain (as above). We then have a collection of instances (or "A-box")
> along with information describing the properties that particular
> individuals have. There is a slight blurring of these worlds due to
> some of the constructors in OWL, but it's worth thinking about it this
> way.
>
> Now once we have our schema or ontology fixed, we can make assertions
> about objects in the world. You might think that star Beta-X-17 is a
> Red Dwarf. I might say it's a Green Fairy (is my lack of astronomical
> knowledge showing??? :-). Let us assume that these two assertions are
> contradictory. However this is now a disagreement about the properties
> of a particular *individual*, rather than a disagreement about the
> properties of the classes in the ontology.
>
> An analogy is that of database and schema. We may agree on the schema
> of our database (people have names, addresses and so on), but disagree
> on who lives at No.14 Acacia Avenue. This is an discrepancy at the
> data level (that we may want to be informed about), but does not
> change the fact that we agree about the general way the world fits
> together.
>
> So in this case, resolving the discrepancy concerning our different
> descriptions of Beta-X-17 is not an *ontology* issue, rather an issue
> about the *use* of that ontology.
>
> This problem is not exclusive to OWL -- we could easily have
> contradictory descriptions of Beta-X-17 using some controlled
> vocabulary or terminology. I guess the interesting thing here though
> is that the richer language allows us to spot that there really *is* a
> contradiction between our opinions. Indeed, allowing contradictory
> descriptions of individuals is key to supporting the Semantic Web --
> it certainly will not be the case that all the information out there
> will agree!
>
> Cheers,
>
>         Sean
> --
> Sean Bechhofer
> seanb@cs.man.ac.uk
> http://www.cs.man.ac.uk/~seanb
>
> >
> > best wishes
> >
> > Anita
> >
> > - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> > Dr. Anita M. S. Richards, AVO Astronomer
> > MERLIN/VLBI National Facility, University of Manchester,
> > Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, U.K.
> > tel +44 (0)1477 572683 (direct); 571321 (switchboard); 571618 (fax).



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Date: Sat, 28 Sep 2002 15:42:16 +0100
From: Carole Goble <carole@cs.man.ac.uk>
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Subject: Re: Taxonomy issues
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Anita

> >
> > A great advantage of an emergent behaviour system is that the computers do
> > the work, and there is no need to hire a librarian who is also an expert in
> > astronomy.
>

In fact it isn't true at all in my opinion. Emergent behaviours need just as much
effort. It also depends what kind of decision making you are doing on the
results. If its for some search tool used by a person you may not care if its is
screwed or odd; if its the basis of an automated decision procedure for composing
some web services or steering a simulation you probably do care.

>
> True up to a point, but the emerging system will need an overhaul every so
> often.  The CDS allocate UCDs automatically to new catalogues, which
> works very well but occasionally something inappropriate slips in and then
> propagates, so a periodic review by someone who is indeed both a librarian
> and has a wide knowledge of astronomy is going to be required.
>

Emergent behaviour needs reasoning perhaps more than a priori schemes in order to
identify inconsistencies so you can do something about them. Inconsistencies may
well be represented -- which leads to diverging ontologies with some common and
some alternatives, which means effectively handling different ontologies with
varying degrees of ontological commitment. The point here is that to be ignorant
or oblivious of inconsistencies is undesirable.

The idea that there are two different worlds - emergent and a priori -- is naive
and a false.  The semantic web effort is based on the merging of both approaches.
hence all the effort in ontology learning.

Of course in biology there are different classifications and definitions -- there
is no standard definition for what a gene is for example. DAML+OIL allows
multiple definitions, and will report on definitions that are inconsistent. What
you do then is an interesting story. And it depends on what you want to use the
ontology / taxonomy for.

My colleague Sean Bechhofer offers these insights below.   A key point he makes
is: are you talking about individuals or concepts? Some of the examples seem to
confuse the two. Ontologies are about concepts. Knowledge bases are about
individuals. They are different spaces.

Cheers


Carole


Sean writes:

Quick answer:

It depends.

Slightly longer answer:

It depends on what you mean by "classifying objects".

Even longer answer:

[Apologies for introducing some technical stuff here, but I think you
have to understand exactly what classification in OWL means in order
to explain this -- I will use "OWL" rather than DAML+OIL as it's
likely to become the standard and it's easier to type :-). Also
apologies if at any point I'm entering into Grandma/egg sucking
territory.]

OWL allows us to define classes of objects and possibly apply
reasoning techniques to discover relationships between those classes
of objects. An interpretation of an OWL ontology maps the classes in
the ontology to collections of objects in the domain (the instances of
the class). We can then do reasoning over the ontology because we have
a precise and unambiguous interpretation of what it *means* when we
form a composite class description using the constructors in the
language.

So, for example, if I talk about the class (Cat or Dog) I know
*exactly* what the interpretation of this is -- it is all the
instances in the domain that are either instances of the class Cat or
the class Dog. The reasoning that we perform about class subsumptions
is then based on those interpretations. Essentially, if we can show
that in *any* interpretation of the ontology, it must be the case that
any instance of B must be an instance of A, then we can deduce that B
is a subclass of A. This, in general, is what we (i.e. myself and my
colleagues) tend to mean when we talk about classification -- it's the
organisation of *classes* into a hierarchy using class subsumption.

Once we have defined an OWL ontology, the relationships between the
classes in the ontology are then not "up for discussion" -- the
semantics tells us precisely when classes will subsume, and when they
will not. (This all assumes, of course that you buy into the
underlying semantics of OWL. You can choose not to, of course and then
interpret the classes in whatever way you choose, but if you do that
then this discussion is not for you anyway.). The ontology represents
some kind of indefeasible state of the world. If I want to use your
ontology, then I have to make a commitment to believing the way that
you have structured the world -- that's what using ontologies does for
us. It provides the shared conceptualisation. With a language like
OWL, not only do we get shared *vocabulary*, but we also get explicit
descriptions of what we mean. If I say in my ontology that (I use a
non-astronomical example here for two reasons: a) it helps to avoid
technical nit-picking; and more importantly b) I know nothing about
astronomy :-)

  CatLover == Person with more than 3 Cats

then I'm being explicit here about what I mean. You may disagree and
say "oh no, a cat lover doesn't have to *have* lots of cats, they just
have to love them". However, at this point, we can now discuss the
definition and possibly refine it. The key point is that rather than
encoding the characteristics of the class in the name or some
documentation as happens in traditional controlled vocabularies, we
are providing a "machine interpretable" description, which will allow
us to make inferences about the classes.

So, onto the subject of contradictions and inconsistency. I say that
all Widgets are blue, while you think that Widgets are red. So in our
ontology, I say:

  Widget -> colour blue

and you say

  Widget -> colour red

If we also have some constraints that say that blue and red are
mutually exclusive, then we have arrived at a contradiction. It is
simply *not possible* for anything to meet the criteria that we have
said must hold for something to be an instance of the class Widget, so
the class is inconsistent. The reasoner will be able to tell us
this. If, after "full and frank discussions", we still maintain these
views, then it's simply the case that we do *not* share a common
conceptualisation of our domain. What I mean by Widget is different to
what you mean by Widget. At this point we either go our separate ways,
or alternatively say nothing in the ontology about the colour of
Widgets, which although now less detailed, now reflects our *shared*
understanding.

Alternatively, we might have different views on the same class. A
classic example here is that of the Triangle. I might define a
Triangle as being a polygon with three sides. You say its a polygon
with three angles. These are, in fact perfectly acceptable (and
mutually consistent) alternative definitions for the class of
Triangles. OWL allows us to supply such alternative definitions, and
the reasoner will tell us when these definitions are consistent and
when they are not.

One solution to this is to use the classification as a "conceptual
coat rack" and hang "extralogical" information off it. This is the
kind of thing that the RuleML initiative is aimed at. This then allows
us to state things about OWL classes that are not necessarily part of
the ontological or intensional definition of the class, but which we
want to make available to applications.

If when you talk about "classifying objects", you actually mean
describing individuals, then the situation is slightly different. The
usual picture (from the Description Logic perspective, which has
strongly influenced the web ontology language work) is that we have an
ontology (or "T-Box" or "schema") that describes the classes of the
domain (as above). We then have a collection of instances (or "A-box")
along with information describing the properties that particular
individuals have. There is a slight blurring of these worlds due to
some of the constructors in OWL, but it's worth thinking about it this
way.

Now once we have our schema or ontology fixed, we can make assertions
about objects in the world. You might think that star Beta-X-17 is a
Red Dwarf. I might say it's a Green Fairy (is my lack of astronomical
knowledge showing??? :-). Let us assume that these two assertions are
contradictory. However this is now a disagreement about the properties
of a particular *individual*, rather than a disagreement about the
properties of the classes in the ontology.

An analogy is that of database and schema. We may agree on the schema
of our database (people have names, addresses and so on), but disagree
on who lives at No.14 Acacia Avenue. This is an discrepancy at the
data level (that we may want to be informed about), but does not
change the fact that we agree about the general way the world fits
together.

So in this case, resolving the discrepancy concerning our different
descriptions of Beta-X-17 is not an *ontology* issue, rather an issue
about the *use* of that ontology.

This problem is not exclusive to OWL -- we could easily have
contradictory descriptions of Beta-X-17 using some controlled
vocabulary or terminology. I guess the interesting thing here though
is that the richer language allows us to spot that there really *is* a
contradiction between our opinions. Indeed, allowing contradictory
descriptions of individuals is key to supporting the Semantic Web --
it certainly will not be the case that all the information out there
will agree!

Cheers,

        Sean
--
Sean Bechhofer
seanb@cs.man.ac.uk
http://www.cs.man.ac.uk/~seanb



>
> best wishes
>
> Anita
>
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> Dr. Anita M. S. Richards, AVO Astronomer
> MERLIN/VLBI National Facility, University of Manchester,
> Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, U.K.
> tel +44 (0)1477 572683 (direct); 571321 (switchboard); 571618 (fax).

From - Sun Sep 29 11:41:18 2002
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> 
> A great advantage of an emergent behaviour system is that the computers do
> the work, and there is no need to hire a librarian who is also an expert in
> astronomy.

True up to a point, but the emerging system will need an overhaul every so
often.  The CDS allocate UCDs automatically to new catalogues, which
works very well but occasionally something inappropriate slips in and then
propagates, so a periodic review by someone who is indeed both a librarian
and has a wide knowledge of astronomy is going to be required. 

best wishes

Anita

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
Dr. Anita M. S. Richards, AVO Astronomer
MERLIN/VLBI National Facility, University of Manchester, 
Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, U.K.           
tel +44 (0)1477 572683 (direct); 571321 (switchboard); 571618 (fax). 	


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Date: Fri, 27 Sep 2002 12:22:23 -0700 (PDT)
From: Ashish Mahabal <aam@astro.caltech.edu>
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The Taxonomy issue is a perfect context to illustrate the scoping
methodology  that Topic Maps have (and other KO/KR manifestations have to
a varying extent under different names):

Taking up the examples that George provided, for each object rather than
putting it in a bin, we just leave it as an object (not very helpful) but
then have multiple scopes which tell us what all it has been / can be
classified as under different contexts. Each such scope, for a given
object, comes with a pointer that tells you where the "classification"
came from and that can take you to more links whcih tell you how dubious
or reliable the classification is.

Thus when you search for a particular scope within objects (radio Es in
the NGP region), you get all objects which have been defined with that
scope (rdio Es), and in addition you get to see all the other scopes
(classifications) those objects may have coming from other sources.

-------------------

Decreasing positional error bars or multiple imaging (for example, under
better conditions) or other reasons may revise the classifications too and
the adopted system will have to have room for that.

-ashish

Ashish Mahabal, Caltech Astronomy, Pasadena, CA 91125
http://www.astro.caltech.edu/~aam aam@astro.caltech.edu

Signatures are a waste of bandwidth.



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From: "Roy Williams" <roy@cacr.caltech.edu>
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Subject: Re: Taxonomy issues
Date: Fri, 27 Sep 2002 12:01:34 -0700
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> When I attended the Sematic Web Workshop at Stanford last year, there
> was a clear distinction between the knowlege-representation(KR), "a
> priori ontology" people and the "emergent behavior" people. The KR
> folks build us systems that make sense, but sometimes cannot handle
> flexible or fuzzy classification schemas. The emergent behavior folks
> build systems that can perhaps handle the fuzziness of the real world,
> but occasionally spout nonsense. Hmmm.

A great advantage of an emergent behaviour system is that the computers do
the work, and there is no need to hire a librarian who is also an expert in
astronomy.

--------
Caltech Center for Advanced Computing Research
roy@cacr.caltech.edu
626 395 3670

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Date: Fri, 27 Sep 2002 12:36:31 -0600
From: Boyd Waters <bwaters+sylph@aoc.nrao.edu>
To: semantics@us-vo.org
Subject: Re: Taxonomy issues
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On Fri, 27 Sep 2002 14:44:49 +0100
"Tony Linde" <tol@star.le.ac.uk> wrote:

> Is it possible using DAML+OIL or equivalents to classify the same object
> as two apparently contradictory things? I assume not. But both authors
> must be allowed to classify an object as different things. So how is
> this issue resolved?

Taxonomy hierarchies are trees -- directed, acyclic graphs -- but in
general, classification schemes need not be. I believe it is possible
to construct ontologies that are not trees, in order to handle the
classification conundrum that you mention.

I have been playing with a classification scheme in which one simply
assigns classification tags (call them "classes") to
entities. Initially, there is no class hierarchy; you must explicitly
call out all the classes to which an entity belongs, rather than
assume that attribution of a particular class implies attribution of
other classes (as would be the case in some implicit class hierarchy).

A collection of these explictly-classified entities -- call it a
training set -- can be used to construct a graph that represents the
correlations between classes.

This correlation graph can be fed back into the entity set to "fill
in" implicit classifications for those entities for which such class
tags are missing; the system suggests classes for these entites. Such
classifcations may be formally accepted or denied, which provides more
information to the graph contructor.

Pretty soon, you have an emergent classification scheme that is quite
useful: you reach a point where you don't have to call out all of the
explicit classifications.

Consider two search engines, Google and Yahoo. Yahoo started out as a
hierarchy of web pages: you traverse the tree to find web sites of
interest, and at each node is a number of web sites that had the
same classification. Google makes no attempt to classify pages, but
rather assumes that pages connected via a hyperlink are related
somehow; Google constructs a correlation graph for the web.


For a constrained knowlege domain -- e.g., "Astronomy" -- an a priori
ontology certainly exists, and needs to be used to verify the validity
of the correlation graph -- the emergent ontology. (When you type in a
search phrase for Google, you often get lots of unrelated items. It
is usually a mistake to assign any scientific significance to these
"outliers".)

Currently, my graph constructor simply solves for correlation. But it
should be possible to solve more-sophisticated constraints; I could
have a set of production rules that modify the correlation
strengths. One could provide an explicit (a priori) ontology to the
system by means of such rules. But I suspect that it would be better
to simply seed the system with a training set that expressed the a
priori ontology.

When I attended the Sematic Web Workshop at Stanford last year, there
was a clear distinction between the knowlege-representation(KR), "a
priori ontology" people and the "emergent behavior" people. The KR
folks build us systems that make sense, but sometimes cannot handle
flexible or fuzzy classification schemas. The emergent behavior folks
build systems that can perhaps handle the fuzziness of the real world,
but occasionally spout nonsense. Hmmm.

I suppose I'm an "emergent behavior" person. I have played with these
things for years; I once (briefly!) worked for a shiny new Internet
start-up company that tried to deliver a web search system very
similiar to the classification scheme I describe here: Collaborative
Filtering. The system worked remarkably well. (And never made it to
product stage...)

-- boyd

Boyd Waters
National Radio Astronomy Observatory
PO BOX 0
Socorro NM 87801
http://www.nrao.edu/~bwaters

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From: "S. G. Djorgovski" <george@astro.caltech.edu>
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OK, I have to weigh in on this.  Astronomical classifications are very
different from those in biology, say.  We use the word "classification"
in several different meanings.  It is important to distinguish between:

- Physically distinct classes which derive from the basic measurements, 
e.g., a radio source, an E galaxy, an IRAS 60um source, a QSO host ..., 
where obviously multiple classes can and should be assigned; they are
all correct.

- Really physical classes, e.g., QSO, normal galaxy, MS star, GRB, planet ...
They can manifest as different measurement-based classes, e.g., a QSO may
or may not be radio-loud, and a radio source may or may not be QSO.

- Measurement-based classifications where there are boundary cases, e.g.,
star/galaxy classif., where you can have what in the old FOCAS is called
"stars with a fuzz"; this can be parametrized in some way (probability of
classification, PSF-ness...)  This is actually a subset of:

- Classes assigned statistically and objectively by some clustering algorithm
operating in some parameter space (a very much VO-type study), which then have
to be interpreted physically.

- Conventionally or subjectivelly assigned classes, such as the Hubble types,
which can easily differ by a class or two between different human classifiers,
different algorithms, wavelength, seeing, ... and which bear some, but not a
perfect correlation to something physically meaningful.

There are several complications:

- An object morphologically classified as a "star" (= PSF-like) could
physically be really a star, or a QSO, or a slow-moving asteroid in a short
exposure, or an optical transient of some sort, etc.  There may be an
equivalent situation with the clustering analysis more generally.  In other
words, operationally and objectively defined classes can contain multiple
physical classes of objects (and v.v.), and for some sources this may be
known or suspected, and in some cases not.

- Blended sources of different classes (in any of the senses listed above),
where a dual class is suggested by the data.

- Of course, measurement errors can move source in and out of the classes
in any one of these senses of classification.

As a practising astronomer, I would like to have a complete picture without
someone's particular value judgement imposed.  So, if I search by position
or indeed any non-class parameter, I'd like to know about ALL classifications
assigned to every source, with some suitable tracers as to where did they
come from.  If I search by class (e.g., give me all radio-loud E's in this
part of the sky), then I also want to have all sources for which there is
at least one such classificastion, but I also want to know about other classes
that might have been assigned for any one of them.

So, I would say that any technical solutions need to be liberal enough to
allow for this diversity, and then provide down-filtering tools.

Now, the really interesting issue in my mind is the danger of missing something
new by forcibly shoving every source in some pre-existing classification bin
or a set thereof.  It is crucial to avoid this, and to design tools which would
isolate "anomalous" sources, while not delivering TB's of garbage along with
them.  Discovery of new types of sources and phenomena is likely to be one
of the key types of VO-based astronomy, so the information infrastructure 
should be designed to facilitate this.

Should we introduce a classification or ontology or whatever of sources
"(possibly/probably/certainly) anomalous" ?  And how does that get done?
Now, there is a problem worthy of this community...

Sorry for the ramble, but I had to get it off my chest.   George Djorgovski

From - Sun Sep 29 11:41:17 2002
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From: "Tony Linde" <tol@star.le.ac.uk>
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Subject: RE: Taxonomy issues
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Thanks, Anita. 

> So we will have to allow an object to be multiply classified.

No problem with that if the classifications are not mutually exclusive,
ie you are simply locating the object along multiple, orthogonal axes.

> There are a few classifications which one might naively want 
> to make exclusive e.g. elliptical or spiral, Seyfert 1 or 
> Seyfert 2 (or more complex sub-groups).

The problem could be where an object sits on the boundary between two
classes. One observer may classify it one way and another the other way,
simply because their analyses of the data are based on two different but
equally respectable techniques.

> Do you think it would work to have a 'security of 
> classification flag'? 

Should be possible, but we would have to discard any idea of mutually
exclusive classes from the ontology which could make checking new
classifications rather a waste of time.

I wonder how the bioinformaticians handle this?

> Or do the search at the time of query - for each object found 
> classified as an elliptical, check it is not also classified 
> as a spiral.

But allow user to specify whether such objects are or are not used. Yes.

Cheers,
Tony. 

> -----Original Message-----
> From: owner-semantics@us-vo.org 
> [mailto:owner-semantics@us-vo.org] On Behalf Of Anita Richards
> Sent: 27 September 2002 16:39
...
> Is a matter of how we restrict the classification classes 
> within an ontology? There are some multiple definitions which 
> are not due to disagreements anyway, and there is also the 
> important point which older astronomers tend to be more 
> careful about, which is that we don't really know what 
> anything is anyway (outside the solar system places where 
> probes have been), so really everything should be 'has the 
> appearance of'/'behaves like' or ' is in the direction of' 
> rather than 'is a' or 'is at' 
> but most of us are more definate just because it is shorter....
> 
> but for example, a galaxy can have multiple names (NGC 6xxx = 
> Markarian 348 = ...), it can a starburst galaxy and a ULIRG 
> (ultra-luminous IR
> galaxy) and a megamaser galaxy (producing bright line 
> emission) and a Seyfert 1 and a spiral....
> 
> So we will have to allow an object to be multiply classified.
> 
> There are a few classifications which one might naively want 
> to make exclusive e.g. elliptical or spiral, Seyfert 1 or 
> Seyfert 2 (or more complex sub-groups). However the problem 
> you raise suggests this would be a bad idea unless there is a 
> very good reason for doing so.  And I think we can have 
> multiple descriptions?  e.g. a car can be both 'red' and 
> 'sports' in the example the Manchester Computing people showed us.
> 
> The trickier question is how we respond to queries, e.g. 
> suppose one catalogue classifies Gridlock A (the brightest 
> radio source in a new constellation named after AstroGrid) as 
> an elliptical, another classifies it as a spiral and the 
> automatic classification routine which we run on Sky Survey 
> plates says it is an irregular.
> 
> If someone says 'what is Gridlock A' we can give them all 3 (or more
> definitions) with references.
> 
> But if someone says 'give me all the ellipticals in Gridlock 
> A' what do we do?  (actually, this is the sort of thing which 
> someone  raised at TIVO, if you look for outliers, for every 
> one interesting and unique object you may get 10 or 100 
> misclassifications/measurement errors..)
> 
> Do you think it would work to have a 'security of 
> classification flag'? This would have to involve some sort of 
> check-list of contradictory classifications - a 'contrdiction 
> exists' property?
> 
> This could work two ways:
> When a catalogue is contributed, check objects with these 
> classifications against existing entries and flag those with 
> contradictions.  Of course, this does not mean that an 
> uncontradicted classification is correct...
> 
> Or do the search at the time of query - for each object found 
> classified as an elliptical, check it is not also classified 
> as a spiral.
> 
> Either way initially the VO could just give a contradiction 
> flag and a reference.  Eventually we could in some cases give 
> an estimate of reliability based on e.g. catalogue 
> resolution, sensitivity, age, or even some VO panel of 
> experts for very large or significant catalogues (in the 
> way that at present we would have a heirachy of position 
> accuracy catalogues, starting with Hiparchos and finishing 
> with the Almagest (or maybe gamma ray catalogues...).
> 
> (For stars it is worse, as they should not be e.g. both 
> spectral type A and G at the same time, and if they are that 
> implies either a mistake or a binary.  But in the case of 
> measurements taken many years apart it could mean it has 
> evolved.  Galaxies don't evolve that fast (but they could 
> have companions within the field of view I suppose...).
> 
> cheers
> a
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
> Dr. Anita M. S. Richards, AVO Astronomer
> MERLIN/VLBI National Facility, University of Manchester, 
> Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, 
> U.K.           
> tel +44 (0)1477 572683 (direct); 571321 (switchboard); 571618 (fax). 	
> 
> 
> 
> 

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Subject: Re: Taxonomy issues
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On Fri, 27 Sep 2002, Tony Linde wrote:

> A letter in Nature today (Vol 419, 26 Sept, p 337) raises the concern
> that creating a 'taxonomy portal' (taxonomy in the sense of species
> classification) could lead to the imposition of a standard view ....

> Is it possible using DAML+OIL or equivalents to classify the same object
> as two apparently contradictory things? I assume not. But both authors
> must be allowed to classify an object as different things.... 

Is a matter of how we restrict the classification classes within an
ontology?
There are some multiple definitions which are not due to disagreements
anyway, and there is also the important point which older astronomers tend
to be more careful about, which is that we don't really know what anything
is anyway (outside the solar system places where probes have been), so
really everything should be 'has the appearance of'/'behaves like' or '
is in the direction of'
rather than 'is a' or 'is at' 
but most of us are more definate just because it is shorter....

but for example, a galaxy can have multiple names (NGC 6xxx = Markarian
348 = ...), it can a starburst galaxy and a ULIRG (ultra-luminous IR
galaxy) and a megamaser galaxy (producing bright line emission) and a
Seyfert 1 and a spiral....

So we will have to allow an object to be multiply classified.

There are a few classifications which one might naively want to make
exclusive e.g. elliptical or spiral, Seyfert 1 or Seyfert 2 (or more
complex sub-groups). However the problem you raise suggests this would
be a bad idea unless there is a very good reason for doing so.  And I think we
can have multiple descriptions?  e.g. a car can be both 'red' and 'sports'
in the example the Manchester Computing people showed us.

The trickier question is how we respond to queries, e.g. suppose one
catalogue classifies Gridlock A (the brightest radio source in a new
constellation named after AstroGrid) as an elliptical, another classifies
it as a spiral and the automatic classification routine which we run on
Sky Survey plates says it is an irregular.

If someone says 'what is Gridlock A' we can give them all 3 (or more
definitions) with references.

But if someone says 'give me all the ellipticals in Gridlock A' what do we
do?  (actually, this is the sort of thing which someone  raised at
TIVO, if you look for outliers, for every one interesting and unique
object you may get 10 or 100 misclassifications/measurement errors..)

Do you think it would work to have a 'security of classification flag'?
This would have to involve some sort of check-list of contradictory
classifications - a 'contrdiction exists' property?

This could work two ways:
When a catalogue is contributed, check objects with these classifications
against existing entries and flag those with contradictions.  Of course,
this does not mean that an uncontradicted classification is correct...

Or do the search at the time of query - for each object found classified
as an elliptical, check it is not also classified as a spiral.

Either way initially the VO could just give a contradiction flag and a
reference.  Eventually we could in some cases give an estimate of
reliability based on e.g. catalogue resolution, sensitivity, age, or even
some VO panel of experts for very large or significant catalogues (in the 
way that at present we would have a heirachy of position accuracy
catalogues, starting with Hiparchos and finishing with the Almagest (or
maybe gamma ray catalogues...).

(For stars it is worse, as they should not be e.g. both spectral type A
and G at the same time, and if they are that implies either a mistake or a
binary.  But in the case of measurements taken many years apart it could
mean it has evolved.  Galaxies don't evolve that fast (but they could have
companions within the field of view I suppose...).

cheers
a
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
Dr. Anita M. S. Richards, AVO Astronomer
MERLIN/VLBI National Facility, University of Manchester, 
Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, U.K.           
tel +44 (0)1477 572683 (direct); 571321 (switchboard); 571618 (fax). 	




From - Tue Sep 24 08:20:21 2002
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From: "Roy Williams" <roy@cacr.caltech.edu>
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Subject: Welcome to VO semantics
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Following a meeting last week of the IVOA (International Virtual
Observatories Alliance), it was decided to set up a working group on how
Virtual Observatories can use "knowledge engineering", how they can become
part of the "semantic web". Subjects include semantics (and what that
means), ontologies (and what that means), XML representations of knowledge,
descriptive logic and DAML/OIL, Topic Maps, RDF, resource registries. (What
else?)

I have tried to think of who would be interested in this topic (see below),
but do not be bound by my narrow view: registration is open, send mail to
majordomo@us-vo.org with message "subscribe semantics". (If you do not want
to be part of this list, write to majordomo with "unsubscribe semantics".)

Please subscribe, encourage colleagues to subscribe, or forward this message
to your own mailing list.

This discussion list is archived at http://archives.us-vo.org/semantics/ I
have taken the liberty of resending some points of view from my mail spool
to the archive already, so please take a look to see some opinions that are
already there (Mahabal, Ludasher, Plante, Linde, myself).

Please come forth with your opinions and experience. We would like our
Virtual Observatory projects to be at the forefront of the Semantic Web.
Right?

Thank You
Roy Williams
-----------------------

(*) currently subscribed:

Sebastien Derriere, FR
Markus Dolensky, DE
Francoise Genova, FR
Carole Goble, UK
Tony Linde, UK
Bertram Ludascher, US
Ashish Mahabal, US
Reagan Moore, US
Ray Plante, US
Anita Richards, UK
Boyd Waters, US
Roy Williams, US


--------
Caltech Center for Advanced Computing Research
roy@cacr.caltech.edu
626 395 3670

From - Thu Sep 26 08:38:57 2002
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From: "Tony Linde" <tol@star.le.ac.uk>
To: <semantics@us-vo.org>
Subject: Ontology-based querying
Date: Wed, 25 Sep 2002 23:56:06 +0100
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I've posted a short page of musings (late night stuff so fairly
rambling) about how an ontological approach to querying might lead to
more intelligent assistance in formulating queries against new datasets.
Could some of the ontology experts here cast an eye over it and tell me
if it is drivel, wishful thinking or can already be done by naďve
computer science undergrads.

Basically, I've asked if it is possible to encode the metadata about
various selection criteria in such a way that the inference engine might
be told the desired metadata of a catalog (eg that it contains a list of
brown dwarfs) and could then deduce the correct selection criteria and
datasets to apply them to.

I'm looking to find a practical use (or future use) of the ontological
approach that will engage astronomers.


Cheers,
Tony.
__
Tony Linde                       Phone:  +44 (0)116 223 1292
AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
University of Leicester          Email:  tol@star.le.ac.uk
Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org 



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From: "Tony Linde" <tol@star.le.ac.uk>
To: <semantics@us-vo.org>
Subject: Ontology-based querying
Date: Wed, 25 Sep 2002 23:57:32 +0100
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I've posted a short page of musings (late night stuff so fairly
rambling) about how an ontological approach to querying might lead to
more intelligent assistance in formulating queries against new datasets.
Could some of the ontology experts here cast an eye over it and tell me
if it is drivel, wishful thinking or can already be done by naďve
computer science undergrads.

Basically, I've asked if it is possible to encode the metadata about
various selection criteria in such a way that the inference engine might
be told the desired metadata of a catalog (eg that it contains a list of
brown dwarfs) and could then deduce the correct selection criteria and
datasets to apply them to.

I'm looking to find a practical use (or future use) of the ontological
approach that will engage astronomers.

Link to page:
http://wiki.astrogrid.org/bin/view/Astrogrid/OntologyBasedSelection


Cheers,
Tony.
__
Tony Linde                       Phone:  +44 (0)116 223 1292
AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
University of Leicester          Email:  tol@star.le.ac.uk
Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org 



From - Sun Oct 20 19:22:33 2002
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From: Sean Bechhofer <seanb@cs.man.ac.uk>
To: Ashish Mahabal <aam@astro.caltech.edu>
cc: Tony Linde <tol@star.le.ac.uk>, <semantics@us-vo.org>
Subject: Re: Ontology-based queries
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On Tue, 15 Oct 2002, Ashish Mahabal wrote:

>
> Tony wrote:
>
> >On the other hand, if we modify the above query to be:
>
> > Object is-of-type SNR
> >  AND Source registers-in-wavelength X-Ray
> >  AND Object is-within (1 arcmin) of-region (05 25 00 -69 38)
>
> >I think we hit difficulties. I cannot see how an ontology-based query
> >like this could work.

OWL will include support for (unary) datatypes, so this kind of
expression/query can be represented.

> The above query is likely to be expanded out to:
>
>  Object is-of-type SNR
>   AND Source registers-in-wavelength X-Ray
>   AND Object has-RA > x.y
>   AND Object has-RA < z.w
>   AND Object has-DEC > a.b
>   AND Object has-DEC < c.d
>
> But then, as you imply, the question of a subclass versus individual
> objects would arise and the query may have to be split into two sections:
> apples and oranges. Do just the first part first using an ontology:

There's no reason why an OWL query engine would not be able to answer
queries like this. As Ashish points out, the query is likely to be
answered through a division of labour between the ontological part and the
datatype part. OWL makes a clear separation between datatype and object
properties, and there are proposed architectures for reasoners (see [1])
that will support precisely this kind of query.

>  Object is-of-type SNR
>   AND Source registers-in-wavelength X-Ray
>
> and then on the resulting set do the SQL like query
>
> select * where Object has-RA > x.y
>   AND Object has-RA < z.w
>   AND Object has-DEC > a.b
>   AND Object has-DEC < c.d
>
> However, if we can store the classes (SNR, X-ray) with an object along
> with its attributes (RA, Dec), we could do the two in one fell swoop.
>
> Whatever way is chosen, an important point to remember will be that the
> query should magically rearrange itself so that the first clause is likely
> to return the smallest number. Otherwise if we go through a large number
> of objects only to throw away most of them at a later point, its a waste
> of resources. But perhaps this point will come up much later.

Of course, query optimisation is essential. I would hope that this would
be part of the reasoner's responsibility, so a client application would
not have to worry about this (much as is the case with standard query
engines).

	Sean

[1] http://www.cs.man.ac.uk/~panz/Zhilin/download/Paper/Pan-Horrocks-datatype-2002.pdf
-- 
Sean Bechhofer
seanb@cs.man.ac.uk
http://www.cs.man.ac.uk/~seanb


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From: Ashish Mahabal <aam@astro.caltech.edu>
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Subject: Re: Ontology-based queries
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Hi Sean,

>> Whatever way is chosen, an important point to remember will be that the
>> query should magically rearrange itself so that the first clause is
>>likely
>> to return the smallest number. Otherwise if we go through a large
>>number
>> of objects only to throw away most of them at a later point, its a
>>waste
>> of resources. But perhaps this point will come up much later.

> Of course, query optimisation is essential. I would hope that this would
> be part of the reasoner's responsibility, so a client application would
> not have to worry about this (much as is the case with standard query
> engines).

However, and this is putting more onus on the tools, if someone makes a
dumb query, we will not want the resources of everybody else who also
query the same computing pool to be tied up. In case of a stand-alone
system it may not matter much, the person will just have to wait. But here
others may have to wait unnecessarily too.

A simple mechanism, at least for some "standard" query parameters could be
to store their sizes and implement the query so that smaller numbers come
first. It will go wrong sometimes, but if designed right, will save time
for all in most instances. Do any of the current, or under development,
tools have anything like this?

-ashish

Ashish Mahabal, Caltech Astronomy, Pasadena, CA 91125
http://www.astro.caltech.edu/~aam aam@astro.caltech.edu

RAM DISK is not an installation procedure!

From - Sun Oct 20 19:22:33 2002
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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: <semantics@us-vo.org>
Subject: RE: Ontology-based queries
Date: Wed, 16 Oct 2002 17:22:07 +0100
Organization: University of Leicester
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OWL sounds good - when are we likely to see the first editors/reasoners?

>
http://www.cs.man.ac.uk/~panz/Zhilin/download/Paper/Pan-Horrocks-datatyp
e-2002.pdf

Strewth! And I thought astronomy papers were difficult to read :)

Cheers,
Tony. 

> -----Original Message-----
> From: Sean Bechhofer [mailto:seanb@cs.man.ac.uk] 
> Sent: 16 October 2002 17:17
> To: Ashish Mahabal
> Cc: Tony Linde; semantics@us-vo.org
> Subject: Re: Ontology-based queries
> 
> 
> On Tue, 15 Oct 2002, Ashish Mahabal wrote:
> 
> >
> > Tony wrote:
> >
> > >On the other hand, if we modify the above query to be:
> >
> > > Object is-of-type SNR
> > >  AND Source registers-in-wavelength X-Ray
> > >  AND Object is-within (1 arcmin) of-region (05 25 00 -69 38)
> >
> > >I think we hit difficulties. I cannot see how an 
> ontology-based query 
> > >like this could work.
> 
> OWL will include support for (unary) datatypes, so this kind 
> of expression/query can be represented.
> 
> > The above query is likely to be expanded out to:
> >
> >  Object is-of-type SNR
> >   AND Source registers-in-wavelength X-Ray
> >   AND Object has-RA > x.y
> >   AND Object has-RA < z.w
> >   AND Object has-DEC > a.b
> >   AND Object has-DEC < c.d
> >
> > But then, as you imply, the question of a subclass versus 
> individual 
> > objects would arise and the query may have to be split into two 
> > sections: apples and oranges. Do just the first part first using an 
> > ontology:
> 
> There's no reason why an OWL query engine would not be able 
> to answer queries like this. As Ashish points out, the query 
> is likely to be answered through a division of labour between 
> the ontological part and the datatype part. OWL makes a clear 
> separation between datatype and object properties, and there 
> are proposed architectures for reasoners (see [1]) that will 
> support precisely this kind of query.
> 
> >  Object is-of-type SNR
> >   AND Source registers-in-wavelength X-Ray
> >
> > and then on the resulting set do the SQL like query
> >
> > select * where Object has-RA > x.y
> >   AND Object has-RA < z.w
> >   AND Object has-DEC > a.b
> >   AND Object has-DEC < c.d
> >
> > However, if we can store the classes (SNR, X-ray) with an 
> object along 
> > with its attributes (RA, Dec), we could do the two in one 
> fell swoop.
> >
> > Whatever way is chosen, an important point to remember will be that 
> > the query should magically rearrange itself so that the 
> first clause 
> > is likely to return the smallest number. Otherwise if we go 
> through a 
> > large number of objects only to throw away most of them at a later 
> > point, its a waste of resources. But perhaps this point 
> will come up 
> > much later.
> 
> Of course, query optimisation is essential. I would hope that 
> this would be part of the reasoner's responsibility, so a 
> client application would not have to worry about this (much 
> as is the case with standard query engines).
> 
> 	Sean
> 
> [1] 
> http://www.cs.man.ac.uk/~panz/Zhilin/download/Paper/Pan-Horroc
ks-datatype-2002.pdf
-- 
Sean Bechhofer
seanb@cs.man.ac.uk
http://www.cs.man.ac.uk/~seanb


From - Sun Oct 20 19:22:32 2002
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From: "Tony Linde" <tol@star.le.ac.uk>
To: <semantics@us-vo.org>
Subject: UCDs, metadata and AstroOntology
Date: Wed, 16 Oct 2002 12:05:09 +0100
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There have been a few papers on the AstroGrid wiki recently arguing for
some changes to the structure and composition of UCDs. This was
discussed at an AVO Interoperability meeting in Strasbourg where the
ideas were well received.

(
For the non-astronomers, UCDs are Unified Column Descriptors, used by
CDS to 'rename' columns in astronomical tables to a standard naming
scheme - check out:
   http://vizier.u-strasbg.fr/UCD/
)

Guy Rixon first argued for splitting the UCDs into 'atoms':
  http://wiki.astrogrid.org/bin/view/Astrogrid/RefactoringUCDs
followed by a suggestion of some atom names:
  http://wiki.astrogrid.org/bin/view/Astrogrid/UCDAtomsPreliminaryList
and Anita Richards followed suit with a slightly alternative approach to
the naming of atoms:
  http://wiki.astrogrid.org/bin/view/Astrogrid/WhatAreUCDsFor

Not to be left out, I've jumped in with:
  http://wiki.astrogrid.org/bin/view/Astrogrid/AreUCDsMetadata
arguing that some of these atomic combinations are embedding metadata
into the column names when it should be kept separate and distinct.

The reason for raising this here is that I could see the atomising of
UCDs, if CDS decide to adopt this approach, being a useful first step
towards creating an AstroOntology (not that I am in any way suggesting
that the argument *for* an AstroOntology is settled).

What do people think? Should UCD names for specific columns contain
everything to make them unique across all of astronomy or only within a
table? Will refactoring of the UCDs into atoms help in creating a final
AstroOntology?

For the non-astronomers reading this list, please contribute. Have you
come across similar problems in other fields? How were they solved?
Should column names reflect the full meaning of a column or only its
meaning within the context of the table in which it occurs? What are the
pros and cons?

Cheers,
Tony. 

__
Tony Linde                       Phone:  +44 (0)116 223 1292
AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
University of Leicester          Email:  tol@star.le.ac.uk
Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
 

From - Sun Oct 20 19:22:33 2002
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From: Guy Rixon <gtr@ast.cam.ac.uk>
To: Ray Plante <rplante@ncsa.uiuc.edu>
cc: Tony Linde <tol@star.le.ac.uk>, <semantics@us-vo.org>
Subject: Re: UCDs, metadata and AstroOntology
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I understand Ray's concerns for smooth migration.  How about these two
schemes?

1. Start with the existing UCDs: use them as atoms.  Add some of the new atoms
as determinatives where the existing UCDs are ambiguous.  E.g. where
INST_BANDPASS could mn a number of things, extend it to

INST_BANDPASS/wavelength/central
INST_BANDPASS/wavelength/extent
INST_BANDPASS/frequency/central

etc.  (substitute your own favourite terms for the actual determinatives)

2. If we define the new UCDs as tuples, it may be easier to see how they fit
in to existing schemes.  We may avoid getting hbung up on notation.

Guy Rixon 				        gtr@ast.cam.ac.uk
Institute of Astronomy   	                Tel: +44-1223-337542
Madingley Road, Cambridge, UK, CB3 0HA		Fax: +44-1223-337523


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Date: Wed, 16 Oct 2002 10:05:16 -0500 (CDT)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: Tony Linde <tol@star.le.ac.uk>
cc: semantics@us-vo.org
Subject: Re: UCDs, metadata and AstroOntology
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Hi,

I agree that with Guy's supposition that UCDs are molecules in which it 
would be useful to have access to atoms and some refactoring would be 
helpful.  I'd like to jump in with my own take on how UCDs might be 
revamped as well as float a roadmap for how we might migrate.  

A general concern that I have had with UCDs is their limited 
role as tags to simple data.  In addition to attaching meaning to table 
columns, we have need to express more complex information that doesn't 
fit well (and often does not appear) in a table column.  The most obvious 
is a coordinate system description.  Arnold Rots has been working up a 
data model for space-time coordinates including some XML markup that can 
be used to describe a system.  He has also recommended some UCDs that 
map into components of this model.  I find it inelegant that we have two 
separate systems to tag this information.  

Last week, a number of us attended a workshop at SAO on developing data 
models for the VO.  One of the issues I'm interested in here is how 
metadata definitions can drop out of a data model.  At this workshop, we 
played with a data model to describe a bandpass that led to some possible 
XML markup for encoding the information.  I was struck that specific 
"atoms" of information could be identified by its XPath location, which is 
normally quite simple.  For example "Bandpass/EffectiveWavelength".  If 
This atom is part of a filter description, we might refer to it as 
"Filter/Bandpass/EffectiveWavelength".  This, of course, is remarkably 
like UCDs where / replaces _.  The nice thing in my mind is the direct 
relationship between this UCD-like tag and XML markup and the data model; 
no explicit mapping needed.

As many of you know, I'm partial to a data-model-based metadata 
definition; however, I don't believe in building a comprehensive model 
that covers everything at once.  This is done a bit at a time.  That 
means if we move to this model, we have to do it in a way that plays well 
with the UCDs we are already using.  Some keys to doing this:
  * namespaces associated with: 
      parts of a data model
      related metdata
      UCDs
  * one should be able to define and experiment with any of the above 
      three types without doing going through the full modeling process.
  * any model, metadata, or UCDs recommended for wide (IVOA) adoption 
      should be required to explicitly define the mappings to the current 
      set of UCDs.

cheers,
Ray




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From: Guy Rixon <gtr@ast.cam.ac.uk>
To: Tony Linde <tol@star.le.ac.uk>
cc: semantics@us-vo.org
Subject: Re: UCDs, metadata and AstroOntology
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In response to Tony's paper on UCDs, I'd like to expand briefly on my view of
what UCDs are for.  For me, UCDs ARE metadata but ARE NOT names.  UCDs are
small collections of truths about (vectors of) data that allow a machine to
get a minimal understanding of how to treat those data.  Column names are
different.

I propose that a programme reading, say, a VOTable should be able to find and
use columns of that table for which it knows the semantics independently of
some ontological service.  I.e., the minimal metadata for using the table
should be included.  Example: find and plot all flux measurements in a
VOTable.  To do this, the programme could usefully search for an atom
"energy-flux".  It could also make use of a complementatry atom indicating
which filter system a flux came from; it might use this to lable a point in
the plot.  The programme would also need to know accurately how a photometric
measurement was presented; otherwise, it might try to combine incompatible
quantities on the same plot.  "Something to do with brightness" isn't a
sufficient description of flux-related quantiities.

Why UCDs as lengthy character strings?  Why not tuples, e.g. XML complex
types.

1. To make the parsing self-contained.  Collating bits of metadata from
many parts of a document makes a programme complicated.

2. To allow the UCDs to be read outside XML, where the only parsing is pattern
matching.

3. To keep the UCDs readable by humans.

Guy Rixon 				        gtr@ast.cam.ac.uk
Institute of Astronomy   	                Tel: +44-1223-337542
Madingley Road, Cambridge, UK, CB3 0HA		Fax: +44-1223-337523

From - Sun Oct 20 19:22:32 2002
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From: Anita Richards <amsr@jb.man.ac.uk>
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> Not to be left out, I've jumped in with:
>   http://wiki.astrogrid.org/bin/view/Astrogrid/AreUCDsMetadata
> arguing that some of these atomic combinations are embedding metadata
> into the column names when it should be kept separate and distinct.

Hi Tony et al.,

I think Tony is right that in some cases the UCDs appear to have too much
detail.  However if I understand his first two questions correctly, the
reason why I suggested the prefixes (or separate but necessary atoms,
whatever order they are in) is that, for example,
INST_FREQ  value Radio would be all the possible observing frequency
ranges of an instrument 
OBS_FREQ  value 1.6 GHz  would be the observing frequency for a particular
observation and at present the flux density of a source in that
observation is given by
PHOT_RADIO_1.6G

or, another example,
OBSTY_POS would be the geographical location of an observatory
OBS_POS   would be the pointing position of the instrument for a
particular observation
SOURCE_POS would be the position of a source within that field of view.

Similarly, if I have understood Guy's example, LENGTH_WAVELENGTH means
something like BANDWIDTH but WAVELENGTH could also be the peak of a
spectral line, or possibly also used as a measure of other quantities like
power spectra formed by Fourier transforming almost anything, or in
wavelet analysis (I am not sure about this exactly, but I do know that
'power spectrum' does not necessarily mean a distribution of energy...).
This does not invalidate Tony's arguments (although it does mean that we
should all - including astronomers - realise that other parts of the field
use terms by 'custom and practice' which are far removed from their formal
meanings.).  We do have to keep the original column names as occasionally
the UCD allocation will go wrong whatever rules you use.

If I understand correctly, what Tony is saying is that e.g. _if_ a
catalogue has the observing frequency in in the header then the source
flux density just needs to be PHOT.

To me that is still using atomised UCDs as metadata, it is simply allowing
their location to be split up, so that in order to execute a query 'find
sources within (cone) with a flux density >10 mJy at 1.6 GHz' the query
engine would select catalogues which covered the necessary position range
and which contained 1.6 GHz measurements, and ideally this would be done
by searching metadata in the catalogue headers.  It would then select
sources and return their properties using the required constraints on the
values held in column entries identified by the column metadata.  I would
call these UCDs.

In practice, catalogues might contain any information anywhere.  For
example, a catalogue might have in the header 'radio sources > 100 mJy'
but not contain any flux densities in the catalogue itself.  Or it might
contain no frequency information in the header but be a catalogue of a
particular type of source, and for each source have flux density
measurements at a number of frequencies, hence PHOT_RADIO_1.6G etc.  
Unless we are going to reconstruct every catalogue so that certain
information comes in the header there is no rigid structure which can tell
you where to find which metadata.  Of course, we can make recommendations,
because it will be much more efficient to be able to select catalogues
from their headers as a first step, and maybe convert or encourage the
authors to convert major catalogues to the most convenient format, but (at
least at first) I am not sure how efficient it would be to get the headers
'right' for every catalogue, or even how useful it would be in the above
example, if a catalogue had measurements for active stars from radio to
x-ray...

I think the point of atomised UCDs is that they could come anywhere in a
catalogue, e.g. every atom in the header would be taken to prefix every
appropriate column description atom, and if columns contained arrays then
they would in turn be prefixed by the higher levels (for example a pair of
columns containing a value and an error could be implicitly thought of as
an array) and the query engine would ahve to know what as 'appropriate'.
And whatever happens there will have to be the first step of converting
the wierd things people call columns and the ways they describe catalogues
into a common 'language'.  As I understand it, the UCDs _are_ the meta
data for each column but they are dynamic, ie built up out of atoms from
the column or the header or possibly higher levels depending on the query.


- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
Dr. Anita M. S. Richards, AVO Astronomer
MERLIN/VLBI National Facility, University of Manchester, 
Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, U.K.           
tel +44 (0)1477 572683 (direct); 571321 (switchboard); 571618 (fax). 	




From - Sun Oct 20 19:22:32 2002
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Tony wrote:

>On the other hand, if we modify the above query to be:

> Object is-of-type SNR
>  AND Source registers-in-wavelength X-Ray
>  AND Object is-within (1 arcmin) of-region (05 25 00 -69 38)

>I think we hit difficulties. I cannot see how an ontology-based query
>like this could work.

The above query is likely to be expanded out to:

 Object is-of-type SNR
  AND Source registers-in-wavelength X-Ray
  AND Object has-RA > x.y
  AND Object has-RA < z.w
  AND Object has-DEC > a.b
  AND Object has-DEC < c.d

But then, as you imply, the question of a subclass versus individual
objects would arise and the query may have to be split into two sections:
apples and oranges. Do just the first part first using an ontology:

 Object is-of-type SNR
  AND Source registers-in-wavelength X-Ray

and then on the resulting set do the SQL like query

select * where Object has-RA > x.y
  AND Object has-RA < z.w
  AND Object has-DEC > a.b
  AND Object has-DEC < c.d

However, if we can store the classes (SNR, X-ray) with an object along
with its attributes (RA, Dec), we could do the two in one fell swoop.

Whatever way is chosen, an important point to remember will be that the
query should magically rearrange itself so that the first clause is likely
to return the smallest number. Otherwise if we go through a large number
of objects only to throw away most of them at a later point, its a waste
of resources. But perhaps this point will come up much later.

-ashish

Ashish Mahabal, Caltech Astronomy, Pasadena, CA 91125
http://www.astro.caltech.edu/~aam aam@astro.caltech.edu

Basic unit of laryngitis: 1 hoarsepower

From - Sun Oct 20 19:22:32 2002
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Reply-To: <tol@star.le.ac.uk>
From: "Tony Linde" <tol@star.le.ac.uk>
To: <semantics@us-vo.org>
Subject: Ontology-based queries
Date: Tue, 15 Oct 2002 18:56:04 +0100
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Based mainly on what Sean has said, is it correct to say that, given a
reasonable AstroOntology, if I want to find:
 
 Object is-of-type SNR
  AND Source registers-in-wavelength X-Ray

what the interpreter does is to formulate a class of the above type and
then find all objects which are instances of subclasses of that class,
whether explicitly or implicitly stated to be so.

If my supposition is correct, it seems that an ontology-based approach
to querying a registry would have significant benefits here since we
don't need to make sure that objects are classified in every way that
they might be queried. SQL queries of this type are notoriously
difficult to code and get to work efficiently.

On the other hand, if we modify the above query to be:

 Object is-of-type SNR
  AND Source registers-in-wavelength X-Ray
  AND Object is-within (1 arcmin) of-region (05 25 00 -69 38)

I think we hit difficulties. I cannot see how an ontology-based query
like this could work.

Is this right? Or am I trying to compare apples and oranges?

Cheers,
Tony. 

__
Tony Linde                       Phone:  +44 (0)116 223 1292
AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
University of Leicester          Email:  tol@star.le.ac.uk
Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
 

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Reply-To: <tol@star.le.ac.uk>
From: "Tony Linde" <tol@star.le.ac.uk>
To: <semantics@us-vo.org>
Subject: Ontology-based queries
Date: Tue, 15 Oct 2002 18:56:04 +0100
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Based mainly on what Sean has said, is it correct to say that, given a
reasonable AstroOntology, if I want to find:
 
 Object is-of-type SNR
  AND Source registers-in-wavelength X-Ray

what the interpreter does is to formulate a class of the above type and
then find all objects which are instances of subclasses of that class,
whether explicitly or implicitly stated to be so.

If my supposition is correct, it seems that an ontology-based approach
to querying a registry would have significant benefits here since we
don't need to make sure that objects are classified in every way that
they might be queried. SQL queries of this type are notoriously
difficult to code and get to work efficiently.

On the other hand, if we modify the above query to be:

 Object is-of-type SNR
  AND Source registers-in-wavelength X-Ray
  AND Object is-within (1 arcmin) of-region (05 25 00 -69 38)

I think we hit difficulties. I cannot see how an ontology-based query
like this could work.

Is this right? Or am I trying to compare apples and oranges?

Cheers,
Tony. 

__
Tony Linde                       Phone:  +44 (0)116 223 1292
AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
University of Leicester          Email:  tol@star.le.ac.uk
Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
 

From - Tue Nov 19 10:04:12 2002
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Date: Fri, 11 Oct 2002 11:38:56 +0100 (GMT Daylight Time)
From: Sean Bechhofer <seanb@cs.man.ac.uk>
To: rector@man.ac.uk
cc: tol@star.le.ac.uk, <semantics@us-vo.org>, <greg@skical.org>,
   <danbri@w3.org>, <libby.miller@bristol.ac.uk>
Subject: Re: Use of DAML+OIL/SkiCal and iCalendar in DAML+OIL
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On Sun, 6 Oct 2002, Alan Rector wrote:

> Tony - Dan, Libby and Greg
>
> Thanks to Tony for bringing the paper to our attention.
>
> A question for the authors...
>
> Most of the issues concern namespaces and equivalence which I
> shall leave to Sean.

> Towards the end of the paper you have an almost throw away comment
> that
>
>     "Another significant problem was the awkward syntax and limited
> expressivity..."
>
> Leaving aside the awkward syntax, I would be curious to know specific
> examples of the  problems with expressivity in your concrete
> task.  The reference to Pat Hayes isn't helpful because I know
> his theoretical position.  The question is, "What happens in practice?"

I too (as an implementor) have struggled with the issue of awkward syntax.
Collaping the richer models down into the RDF triple model makes things
hard (from an implementation point of view) and produces effectively
unreadable syntax (from a user point of view). However, that shouldn't
necessarily be a problem -- rather it's a requirement for good end-user
tools. RDF shouldn't be seen as a human readable syntax, but as a
mechanism for exchange between machines.

As with Alan, I'd be interested in knowing where the expressivity is
insufficient.

In the concluding section, there's a comment:

"Where DAML+oil is used to describe relations between objects in
ontologies written by different authors, connecting the ontologies
involves hypothesising what the author meant by the ontology. A machine
readable DAML+oil ontology does not capture all the aspects of the world
in the area which it claims to represent, and so there is immense
potential for error, still more so when the ontologies are defined in RDF
Schema or Mime directories or other means less precise than DAML+oil."

This is a good point, and one that's present regardless of the
representation used. One of our hypotheses is that the explicit modelling
capabilities of richer languages will help to alleviate the problems of
interpreting the author's original intent.

"Even within a single ontology, the degree of precision that DAML+oil
enables you to describe between objects is in many cases greater than the
degree of precision that you know pertains in those particular
circumstances. This means that arbitrary decisions are made for those
descriptions, leading to errors of interpretation, and, paradoxically, a
reduction in precision, because of the introduction of this random noise."

Again, are there examples of this? The use of a rich language does not
mandate that one has to use all the functionality. We could quite easily
define simple taxonomies (or even a completely flat vocabulary) using D+O.
Indeed, one of our approaches to building models is to do precisely this
-- start out with a simple taxonomic structure and then incrementally
refine this through definition.

Greg later wrote:

>I am sure all these problems are old hat for others and I am surely the
>least qualified to criticize DAML+OIL. After the fact I would say that
>SkiCal just wasn't "hierarchal" enough to make sense in DAML+OIL and I am
>not quite sure what would be, but Alan has asked for a response, maybe we
>can talk a bit about this on Wednesday and I can brush up on the work and
>be more concrete, otherwise I realize that this too is an "argument with
>out evidence".

Looking briefly at the iCal format, it does look to be lacking many
intensionally defined classes, which is the sort of area that D+O is good
at tackling. iCal seems rather to give a kind of top level schema for the
sort of information that you might want to store about events. I think
that where this kind of scenario would benefit is in the modelling of the
vocabulary that is then used to populate that schema. For example, the
kinds of person that may be involved in an event, or the different kinds
of venue where an event may be held.

Cheers,

	Sean

-- 
Sean Bechhofer
seanb@cs.man.ac.uk
http://www.cs.man.ac.uk/~seanb

From - Wed Oct  9 13:58:08 2002
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From: "Tony Linde" <tol@star.le.ac.uk>
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Subject: FW: ERCIM News No 51 published: Semantic Web
Date: Wed, 9 Oct 2002 12:41:13 +0100
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For everyone's information:

-----Original Message-----
From: Peter Kunz [mailto:peter.kunz@ercim.org] 
Sent: 09 October 2002 08:32
To: Peter Kunz
Subject: ERCIM News No 51 published


ERCIM NEWS No 51
Special Theme: Semantic Web
has just been published at http://www.ercim.org/publication/Ercim_News/

==============================================================

The ERCIM News website http://www.ercim.org/publication/Ercim_News/
offers:
- FREE SUBSCRIPTION to the printed edition
- previous issues online back to 1994
- full text search of the current and former issues
- ordering paper copies of back issues available on stock

==============================================================
ERCIM FELLOWSHIP PROGRAMME: DEADLINE 31 OCTOBER
ERCIM offers postdoctoral fellowships in leading European information
technology research centres. Fellowships are of 18 months duration,
generally spent in two research centres. Competitive salary. Deadline
for applications: 31 October 2002 Full description of the programme,
conditions and the online application form can be found at
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==============================================================
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See also:
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From - Mon Oct  7 11:46:31 2002
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From: "Greg FitzPatrick" <greg@skical.org>
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   "Par Lannero" <par.lannero@metamatrix.se>
Subject: RE: Use of DAML+OIL/SkiCal and iCalendar in DAML+OIL
Date: Mon, 7 Oct 2002 10:31:48 +0200
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Alan and Tony

It has been a while since I worked on this and my memory isn't all that great.

I remember that I was quite enthusiastic about the annotated walkthru created to exemplify  DAML+OIL.  It seemed to me that we could just rewrite the walkthru using SkiCal instead of the existing examples and I started out with that intention, replacing animals with events and so on.

The further I got into this experiment, the more apparent it became to me how artificial the exemplifying ontology of the walkthru was.  Yes, of course it was just a bunch of made up examples, but as I progressed it became increasingly difficult to discern instance from schema.  There seemed to be a slightly tautological aspect to the entire walkthru which I had missed prior to my attempt to reuse it.  

Obviously there is a danger in picking fictional examples out of your head (populating an idea) to exemplify a structure since those examples are always going to fit.   

I am sure all these problems are old hat for others and I am surely the least qualified to criticize DAML+OIL. After the fact I would say that SkiCal just wasn't "hierarchal" enough to make sense in DAML+OIL and I am not quite sure what would be, but Alan has asked for a response, maybe we can talk a bit about this on Wednesday and I can brush up on the work and be more concrete, otherwise I realize that this too is an "argument with out evidence".
            
Greg

P.S.
  
I have jokingly said to Libby and Dan that I think all schema examples should be about aliens and written in at least Russian, or some other language or topic that those involved in the schema work do not understand.  I am sure the "self-evident" nature of the IPO example invariably used in schema walkthroughs (though not in the DAML+OIL instance) have caused considerable damage.

       



-----Original Message-----
From: Alan Rector [mailto:rector@cs.man.ac.uk]
Sent: Sunday, October 06, 2002 12:19 PM
To: tol@star.le.ac.uk
Cc: semantics@us-vo.org; greg@skical.org; danbri@w3.org;
libby.miller@bristol.ac.uk
Subject: Re: Use of DAML+OIL/SkiCal and iCalendar in DAML+OIL


Tony - Dan, Libby and Greg

Thanks to Tony for bringing the paper to our attention.

A question for the authors...

Most of the issues concern namespaces and equivalence which I
shall leave to Sean.

Towards the end of the paper you have an almost throw away comment
that

    "Another significant problem was the awkward syntax and limited
expressivity..."

Leaving aside the awkward syntax, I would be curious to know specific
examples of the  problems with expressivity in your concrete
task.  The reference to Pat Hayes isn't helpful because I know
his theoretical position.  The question is, "What happens in practice?"

I know which things have caused problems in  building
biomedical ontologies.  I think it is very important to know, concretely,
what causes  problems to others in other fields.
Otherwise we are arguing without evidence.

Thanks

Alan

--
Alan L Rector
Professor of Medical Informatics
Department of Computer Science
University of Manchester
Manchester M13 9PL, UK
TEL: +44-161-275-6188/6239/7183
FAX: +44-161-275-6204
email: rector@cs.man.ac.uk
web: www.cs.man.ac.uk/mig
        www.opengalen.org




Tony Linde wrote:

> Ran across this paper at:
>   http://www.ilrt.bristol.ac.uk/discovery/2002/03/skical-daml/
>
> It deals with applying DAML+OIL approach to an existing application
> (SkiCal). I'd be interested to get Sean's comments on how they
> approached the problem and their conclusions about DAML+OIL.
>
> (I'll be glad when OWL takes over - it's easier to type!)
>
> Cheers,
> Tony.
>
> __
> Tony Linde                       Phone:  +44 (0)116 223 1292
> AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
> Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
> University of Leicester          Email:  tol@star.le.ac.uk
> Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
>





From - Tue Oct  8 09:47:09 2002
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Subject: Gravitational Lens, Ontological Dispersion.
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http://cfa-www.harvard.edu/castles/index.html

A good illustration of some typical ontological issues discussed lately.
... could provide a good test bed for any tool you could think about ...

What objects are classified here?

-- The title of the page is : "Gravitational Lens Data Base"
-- The presentation says : "We will provide information and data on gravitational lens
systems".
Follows a table of "Multiply Imaged Systems" including a chilling grade system :(
"... likelihood that the object is a lens:
A=I'd bet my life, B=I'd bet your life, C=I'd bet your life and you should worry."

Take one of the "objects" classified here, say "PG 1115+080" - Grade A, not a too risky
one :)
PG 1115+080 is the "Lens Name" ("standard name for the lens"). So far, so good ...

But look at the reference papers to find out various types for the same guy ...

 -- Gravitational Lens
 -- Galaxy Lens
 -- Gravitational Lens System
 -- Quadruply Imaged Quasar
 -- Quadruple Gravitational Lens
 -- Gravitational Mirage
 -- Multiple QSO
 -- Triple QSO

So what does PG1115 + 08 identifies?

-- The (set of) QSO(s) of which image is distorded?
-- The massive system (galaxy?) provoking the lens effect?
-- The system "QSO + lens"?
-- The whole region of space-time where the lens effect takes place?
-- The apparent source(s) on the sky?

-- All of those, in different scopes?

And if it's only one of those, what are the identifiers for the others, if necessary?

In short, what are the data at
http://cfa-www.harvard.edu/castles/PG1115.html
exactly about?

Looks like the lens effect is also provoking some ontological dispersion ;-)

Is Virtual Observatory Semantics supposed to tackle that kind of issues?

Bernard


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From: "Bernard Vatant" <bernard.vatant@mondeca.com>
To: <semantics@us-vo.org>
Cc: "Nikita Ogievetsky" <nogievet@cogx.com>
References: <005e01c26de5$fb22b790$b524d28f@bunyip>
Subject: Re: Use of DAML+OIL/SkiCal and iCalendar in DAML+OIL
Date: Mon, 7 Oct 2002 19:29:35 +0200
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*Tony Linde
> In the scientific domain, such as with astronomical VOs, it is
> different. While we still have the issue of determining the right way to
> map concepts as classes, whether using a data modelling or ontological
> approach, there is an additional problem with creating the instances.
> Three people may analyse the same data for a given point in the sky: one
> will say the object is a brown dwarf, one will say it is a 'green fairy'
> and the third may say that the readings are simply errors in the
> instrument. All three 'statements' must be possible about the same set
> of data points.

This is fairly close to the situation exposed at
http://archives.us-vo.org/semantics/0033.html

A Topic Map view of such a situation would be as following:

- The observation data set itself is a specific resource (image, spectrum, whatever ...)
- It is identified by some locator URI, and attached some relevant metadata (observation
source, date, quality, format ...).
In Topic Maps terminology, this resource is an "addressable subject", stored somewhere in
the network, and retrievable through its locator. It is represented by a specific topic,
say "Obs-ABCD-1234".
- This topic can be classified through various hierarchies (observation type, bandwidth,
instrument, protocol ...)
- This topic is related to other topics like Instrument X, Team Z, Observatory K, Project
W, through specific associations.

All the above, expressed by a specific network of associations involving topic
"Obs-ABCD-1234", is completely independent of and distinct from any out there object - if
any - this observation is supposed to "represent", "show" or "be Image Of".
All the above looks like regular "enterprise content" and is likely to be managed as such,
with not too many ontological issues: objects and types in it are not too much
controversial in identity, they are like any other down-to-earth business objects.

Now you got your two interpretations of "Obs-ABCD-1234" as so many distinct topics.

"BD_0524-0867"     (instanceOf "Brown Dwarf")
"GF_4567"            (instanceOf "Green Fairy")

The observation interpretation can now expressed as specific associations, in different
scopes,
like:

(1) Observation-Interpretation [observation: Obs-ABCD-1234, object: Brown Dwarf 0524-0867]

If you consider there is no out-there object, but just instrumental artifact, just
classify Obs-ABCD-1234 as junk :)

> Or perhaps what we're looking for is a way in which the set of data
> points is only ever represented by these 'statements'. The 'object' is
> never instantiated as an instance of one or other classes - bit like
> quantum superposition except that resolution is never absolute :)

The above way to do is somehow avoiding the quantum superposition effect, by making the
interpretation different in different scopes. "BD_0524-0867" is a brown dwarf by
definition. I can always say there exists an instance of the class Brown Dwarf called
BD_0524-0867 - even with the status of unproven assertion, and try to gather consistent
information about it. That there "is" an object out there "belonging" "really" to the
brown dwarf class is another (metaphysic) issue.

All the problem is to know if the assertion expressed by (1) is consistent with:
-- the current definition of brown dwarf class
-- consistent interpretation of Obs-ABCD-1234
-- previous data/information/knowledge, if any, concerning BD_0524-0867

The superposition effect happens only if you want to consider different interpretations as
likely. But it's a very good analogy. And BTW Nikita Ogievetsky, (former neutrino
physicist and now topic maps guru) has developed the notion of "quantum topic maps".
A fascinating aspect of it is that, like a quantum object, any subject is changed by (not
to say made of) the assertions you make on it (interpreted as interactions), and is not a
static out-there realistic "thing". I forward this to Nikita, hoping to see him jump in
the debate with fascinating insights :))

See http://www.cogx.com/kt2002/

Bernard

-------------------------------------------------------------------
Bernard Vatant
Consultant - Mondeca
www.mondeca.com
Chair - OASIS TM PubSubj Technical Committee
www.oasis-open.org/committees/tm-pubsubj/
-------------------------------------------------------------------

From - Mon Oct  7 11:59:50 2002
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From: "Tony Linde" <tol@star.le.ac.uk>
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Subject: RE: Use of DAML+OIL/SkiCal and iCalendar in DAML+OIL
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Greg,

Thanks for pitching in here. I think Alan's comment that 'it is very
important to know, concretely, what causes problems to others in other
fields' is exactly right. 

I guess what applications people (which I mostly fit into) are looking
for is some idea of the types of problem domain that an ontological
approach will and will not fit. And the ontology people are looking to
iron out the problems that do arise.

It seems to me that the SkiCal experiment was akin to problems in the
business arena. In the past I've spent a long time trying to define the
structure of a problem, mapping the right classes and structures that,
together, will make it easiest to instantiate business objects and
processes and then building an application around them. The uncertainty
here was in getting the right class to map a set of objects. Lots of
mappings could work; the trick was choosing the best one. 

Given that you'd already done this to get the application working, the
ontological work was of little extra benefit. And, even if starting from
scratch, the effort involved was greater than the original modelling
effort. No?

In the scientific domain, such as with astronomical VOs, it is
different. While we still have the issue of determining the right way to
map concepts as classes, whether using a data modelling or ontological
approach, there is an additional problem with creating the instances.
Three people may analyse the same data for a given point in the sky: one
will say the object is a brown dwarf, one will say it is a 'green fairy'
and the third may say that the readings are simply errors in the
instrument. All three 'statements' must be possible about the same set
of data points. 

The additional benefit we're looking for from an ontological approach is
the use of an inference engine to tell us when one set of statements is
the same or different to another set. Whether that can then be put to
practical use is another question.

Or perhaps what we're looking for is a way in which the set of data
points is only ever represented by these 'statements'. The 'object' is
never instantiated as an instance of one or other classes - bit like
quantum superposition except that resolution is never absolute :) I
wonder if this will affect the way we design our VO more fundamentally
than I though - worth thinking about.

<humming sound as Tony disappears into another reverie...>

Cheers,
Tony. 

> -----Original Message-----
> From: Greg FitzPatrick [mailto:greg@skical.org] 
> Sent: 07 October 2002 09:32
> To: rector@man.ac.uk; tol@star.le.ac.uk
> Cc: semantics@us-vo.org; danbri@w3.org; 
> libby.miller@bristol.ac.uk; Par Lannero
> Subject: RE: Use of DAML+OIL/SkiCal and iCalendar in DAML+OIL
> 
> 
> Alan and Tony
> 
> It has been a while since I worked on this and my memory 
> isn't all that great.
> 
> I remember that I was quite enthusiastic about the annotated 
> walkthru created to exemplify  DAML+OIL.  It seemed to me 
> that we could just rewrite the walkthru using SkiCal instead 
> of the existing examples and I started out with that 
> intention, replacing animals with events and so on.
> 
> The further I got into this experiment, the more apparent it 
> became to me how artificial the exemplifying ontology of the 
> walkthru was.  Yes, of course it was just a bunch of made up 
> examples, but as I progressed it became increasingly 
> difficult to discern instance from schema.  There seemed to 
> be a slightly tautological aspect to the entire walkthru 
> which I had missed prior to my attempt to reuse it.  
> 
> Obviously there is a danger in picking fictional examples out 
> of your head (populating an idea) to exemplify a structure 
> since those examples are always going to fit.   
> 
> I am sure all these problems are old hat for others and I am 
> surely the least qualified to criticize DAML+OIL. After the 
> fact I would say that SkiCal just wasn't "hierarchal" enough 
> to make sense in DAML+OIL and I am not quite sure what would 
> be, but Alan has asked for a response, maybe we can talk a 
> bit about this on Wednesday and I can brush up on the work 
> and be more concrete, otherwise I realize that this too is an 
> "argument with out evidence".
>             
> Greg
> 
> P.S.
>   
> I have jokingly said to Libby and Dan that I think all schema 
> examples should be about aliens and written in at least 
> Russian, or some other language or topic that those involved 
> in the schema work do not understand.  I am sure the 
> "self-evident" nature of the IPO example invariably used in 
> schema walkthroughs (though not in the DAML+OIL instance) 
> have caused considerable damage.
> 
>        
> 
> 
> 
> -----Original Message-----
> From: Alan Rector [mailto:rector@cs.man.ac.uk]
> Sent: Sunday, October 06, 2002 12:19 PM
> To: tol@star.le.ac.uk
> Cc: semantics@us-vo.org; greg@skical.org; danbri@w3.org; 
> libby.miller@bristol.ac.uk
> Subject: Re: Use of DAML+OIL/SkiCal and iCalendar in DAML+OIL
> 
> 
> Tony - Dan, Libby and Greg
> 
> Thanks to Tony for bringing the paper to our attention.
> 
> A question for the authors...
> 
> Most of the issues concern namespaces and equivalence which I 
> shall leave to Sean.
> 
> Towards the end of the paper you have an almost throw away 
> comment that
> 
>     "Another significant problem was the awkward syntax and 
> limited expressivity..."
> 
> Leaving aside the awkward syntax, I would be curious to know 
> specific examples of the  problems with expressivity in your 
> concrete task.  The reference to Pat Hayes isn't helpful 
> because I know his theoretical position.  The question is, 
> "What happens in practice?"
> 
> I know which things have caused problems in  building 
> biomedical ontologies.  I think it is very important to know, 
> concretely, what causes  problems to others in other fields. 
> Otherwise we are arguing without evidence.
> 
> Thanks
> 
> Alan
> 
> --
> Alan L Rector
> Professor of Medical Informatics
> Department of Computer Science
> University of Manchester
> Manchester M13 9PL, UK
> TEL: +44-161-275-6188/6239/7183
> FAX: +44-161-275-6204
> email: rector@cs.man.ac.uk
> web: www.cs.man.ac.uk/mig
>         www.opengalen.org
> 
> 
> 
> 
> Tony Linde wrote:
> 
> > Ran across this paper at:
> >   http://www.ilrt.bristol.ac.uk/discovery/2002/03/skical-daml/
> >
> > It deals with applying DAML+OIL approach to an existing application 
> > (SkiCal). I'd be interested to get Sean's comments on how they 
> > approached the problem and their conclusions about DAML+OIL.
> >
> > (I'll be glad when OWL takes over - it's easier to type!)
> >
> > Cheers,
> > Tony.
> >
> > __
> > Tony Linde                       Phone:  +44 (0)116 223 1292
> > AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
> > Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
> > University of Leicester          Email:  tol@star.le.ac.uk
> > Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
> >
> 
> 
> 
> 

From - Sun Oct  6 22:11:24 2002
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Ran across this paper at:
  http://www.ilrt.bristol.ac.uk/discovery/2002/03/skical-daml/

It deals with applying DAML+OIL approach to an existing application
(SkiCal). I'd be interested to get Sean's comments on how they
approached the problem and their conclusions about DAML+OIL.

(I'll be glad when OWL takes over - it's easier to type!)

Cheers,
Tony. 

__
Tony Linde                       Phone:  +44 (0)116 223 1292
AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
University of Leicester          Email:  tol@star.le.ac.uk
Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
 

From - Sun Oct  6 22:11:24 2002
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Subject: RE: Where to start (was: Ontology for Dummies)
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I found Sean's complicated example very interesting. And I'm going to go
back to my ontology-based querying topic...

Both of the classes below could be represented (in a complicated way) as
SQL queries. Can we do the reverse then and represent queries as classes
and then use the inference engine to deduce when one query is a subclass
or superclass of another to make inferences about the actual or
potential results. 

And, to bring in the discussion on another topic (though I've not had
time yet to read the related stack of papers on my desk), could we
therefore define 'distance' between queries and make inferences from the
distances.

Cheers,
Tony. 

> -----Original Message-----
> From: owner-semantics@us-vo.org 
> [mailto:owner-semantics@us-vo.org] On Behalf Of Sean Bechhofer
> Sent: 04 October 2002 14:19
> To: Bernard Vatant
> Cc: semantics@us-vo.org
> Subject: Re: Where to start (was: Ontology for Dummies)
...
> As a more complicated example (which is again, I'm afraid, 
> non-astronomical), consider the class of people who have a 
> son and all of who's children are Lawyers. In OWL, I'd say 
> something like:
> 
> PersonWithSonAndAllLawyerChildren =
>  Person AND
>  all child Lawyer
>  some child Male
> 
> How would I represent this information using TMs? And how do 
> I then ensure that I can tell that the class:
> 
> PersonWithSonAndDaughterBothLawyers =
>   Person AND
>   exact 2 child
>   some child (Male AND Lawyer)
>   some child (Female AND Lawyer)
> 
> is a subclass of the first one, e.g. any instances of 
> PersonWithSonAndDaughterBothLawyers are necessarily instances 
> of PersonsWithSonAndLawyerChildren (which then allows me to 
> do things like induce a taxonomy from my definitions).
... 

From - Sun Oct  6 22:11:24 2002
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From: Sean Bechhofer <seanb@cs.man.ac.uk>
To: Bernard Vatant <bernard.vatant@mondeca.com>
cc: semantics@us-vo.org
Subject: Re: Where to start (was: Ontology for Dummies)
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On Fri, 4 Oct 2002, Bernard Vatant wrote:

> *Sean
> > If this discussion is proving uninteresting or irrelevant to the mailing
> > list, please let us know and we can take it elsewhere....
>
> Assuming that Tony's answer to that is representative, let's keep on for a while :)
>
> *SB
> > I suppose the issue here is that I think that inference is crucial if
> > we're going to get added value from machine processing (and really have a
> > *Semantic* web).
>
> Agreed. I guess no one will argue on that. But OTOH I guess users (astronomers)
> want also added value in the human-machine interface also. And, the way I figure it, OWL
> would be good for the machine processing added value, but TM would be good for the
> human-machine interface added value. That goes along the lines of what Carol wrote in a
> previous post that we should not look as those technologies as concurrents, looking for
> the "killer app", but audit what each of them could bring, and eventually put the pieces
> where they fit. The tricky thing is to figure how to make them work together ...

Absolutely. I would never claim that any single technology will solve all
our problems! As you say, we need nice things for users to look
at/interact with and well-defined formal things for machines to work with
along with a seamless integration between the two :-)) I guess this kind
of discussion helps to inform us of the boundaries of the constituent
parts.

> *BV
> > > Is there less semantics in the TM expression than in the OWL expression?
> > > Let alone the capacity of the latter to draw inferences ...
>
> That was not begging the answer, but a reallly naive question :)
>
> *SB
> > I'm afraid I don't quite follow this, and don't see where the semantics
> > are here.
>
> Oh, you mean by semantics here the machine-interpretability, right?

Oh yes. In this context when I talk about semantics I (pretty much)
*always* mean machine-intepretability. That's what (in my opinion) the
"semantics" in the Semantic Web is all about.

	Sean

-- 
Sean Bechhofer
seanb@cs.man.ac.uk
http://www.cs.man.ac.uk/~seanb


From - Fri Oct  4 17:14:39 2002
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*Sean
> If this discussion is proving uninteresting or irrelevant to the mailing
> list, please let us know and we can take it elsewhere....

Assuming that Tony's answer to that is representative, let's keep on for a while :)

*SB
> I suppose the issue here is that I think that inference is crucial if
> we're going to get added value from machine processing (and really have a
> *Semantic* web).

Agreed. I guess no one will argue on that. But OTOH I guess users (astronomers)
want also added value in the human-machine interface also. And, the way I figure it, OWL
would be good for the machine processing added value, but TM would be good for the
human-machine interface added value. That goes along the lines of what Carol wrote in a
previous post that we should not look as those technologies as concurrents, looking for
the "killer app", but audit what each of them could bring, and eventually put the pieces
where they fit. The tricky thing is to figure how to make them work together ...

*BV
> > Is there less semantics in the TM expression than in the OWL expression?
> > Let alone the capacity of the latter to draw inferences ...

That was not begging the answer, but a reallly naive question :)

*SB
> I'm afraid I don't quite follow this, and don't see where the semantics
> are here.

Oh, you mean by semantics here the machine-interpretability, right?

> How do I know (without you having to tell me extra stuff about
> the interpretation of your particular association types) that the
> assertion above should be interpreted as the given constraint? I.e. that
> class_colour restricts the class to having the particular colour. Is this
> how I *always* interpret an association type? And if not, how do I ensure
> that this information is conveyed?

OK. Good point. There is indeed no way to make sure about that, in a completely automatic
way, from inside the topic map.
The interpretation of class_colour association has to put in the loop some external
definition of the association type,
e.g. through a published subject indicator.

*SB
> As a more complicated example ... <snip/>

I think there is no need for the more complicated example :)

Cheers

Bernard

From - Fri Oct  4 16:40:29 2002
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From: "Tony Linde" <tol@star.le.ac.uk>
To: <semantics@us-vo.org>
Subject: RE: Where to start (was: Ontology for Dummies)
Date: Fri, 4 Oct 2002 14:36:44 +0100
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> If this discussion is proving uninteresting or irrelevant to 
> the mailing list, please let us know and we can take it elsewhere....

No, this is very interesting. Key to my own interest is the *usefulness*
of an ontology. And I'm learning more about it all as well!

Carry on, guys.

Cheers,
Tony. 

> -----Original Message-----
> From: owner-semantics@us-vo.org 
> [mailto:owner-semantics@us-vo.org] On Behalf Of Sean Bechhofer
> Sent: 04 October 2002 14:19
> To: Bernard Vatant
> Cc: semantics@us-vo.org
> Subject: Re: Where to start (was: Ontology for Dummies)
> 
> 
> 
> If this discussion is proving uninteresting or irrelevant to 
> the mailing list, please let us know and we can take it elsewhere....
> 
> On Fri, 4 Oct 2002, Bernard Vatant wrote:
> 
> > * Sean Bechhofer
...

From - Fri Oct  4 15:30:31 2002
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From: Sean Bechhofer <seanb@cs.man.ac.uk>
To: Bernard Vatant <bernard.vatant@mondeca.com>
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If this discussion is proving uninteresting or irrelevant to the mailing
list, please let us know and we can take it elsewhere....

On Fri, 4 Oct 2002, Bernard Vatant wrote:

> * Sean Bechhofer
> > Topic Maps and OWL (hereafter referred to as TM and OWL to save
> > typing) *are* different. This is not to say that one is "better" than
> > the other though -- they are *different*, and are suitable for
> > different purposes. TMs provide a kind of model of "back of the book
> > indexes", a way of indexing particular occurrences of topics or
> > subjects. In my opinion, they are not a framework for representing
> > ontologies (** see below).
>
> This is controversial, even TM folks are not quite clear on that.
> TM are a framework for representing taxonomies and semantic networks.
> What is missing (so far) is the constraint and inference layer.

Ok. I suppose the issue here is that I think that inference is crucial if
we're going to get added value from machine processing (and really have a
*Semantic* web).

> > The crucial point with OWL is that we have a well-defined notion of
> > what it means when we say:
> >
> > telephone -> all colour black
> >
> > i.e. all telephones can *only* have the colour black.
>
> Anyway. I don't see why TM could not express that by using specific topics and
> associations.
>
> Define a topic representing the class "telephone"
> Define a topic representing the concept "colour'
> Define a topic representing the colour "black"
> Define a topic representing the concept "class"
> Define a topic representing the association type "class_colour"
>
> Every one of the above being defined as a Published Subject if possible.
>
> Then define an instance of the association-type "class_colour"
> where "telephone" plays the role of "class" and "black" plays the role of "colour"
>
> class_colour (class: "telephone" ; colour: "black")
>
> And, at will, constrain the domain of validity of this assertion by a convenient scope,
> like "1930, USSR" ;-)
>
> Is there less semantics in the TM expression than in the OWL expression?
> Let alone the capacity of the latter to draw inferences ...

I'm afraid I don't quite follow this, and don't see where the semantics
are here. How do I know (without you having to tell me extra stuff about
the interpretation of your particular association types) that the
assertion above should be interpreted as the given constraint? I.e. that
class_colour restricts the class to having the particular colour. Is this
how I *always* interpret an association type? And if not, how do I ensure
that this information is conveyed?

As a more complicated example (which is again, I'm afraid,
non-astronomical), consider the class of people who have a son and all of
who's children are Lawyers. In OWL, I'd say something like:

PersonWithSonAndAllLawyerChildren =
 Person AND
 all child Lawyer
 some child Male

How would I represent this information using TMs? And how do I then ensure
that I can tell that the class:

PersonWithSonAndDaughterBothLawyers =
  Person AND
  exact 2 child
  some child (Male AND Lawyer)
  some child (Female AND Lawyer)

is a subclass of the first one, e.g. any instances of
PersonWithSonAndDaughterBothLawyers are necessarily instances of
PersonsWithSonAndLawyerChildren (which then allows me to do things like
induce a taxonomy from my definitions).

Cheers,

	Sean

-- 
Sean Bechhofer
seanb@cs.man.ac.uk
http://www.cs.man.ac.uk/~seanb


From - Fri Oct  4 14:47:35 2002
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A little more about TM, to follow-up with Sean

*Tony Linde:
> > I don't want to spark an OntoWar, but could people (participants and
> > lurkers alike) say if there is any significant difference between a
> > topic map approach to ontologies and an OWL (or its ancestors') language
> > approach.

* Sean Bechhofer
> Topic Maps and OWL (hereafter referred to as TM and OWL to save
> typing) *are* different. This is not to say that one is "better" than
> the other though -- they are *different*, and are suitable for
> different purposes. TMs provide a kind of model of "back of the book
> indexes", a way of indexing particular occurrences of topics or
> subjects. In my opinion, they are not a framework for representing
> ontologies (** see below).

This is controversial, even TM folks are not quite clear on that.
TM are a framework for representing taxonomies and semantic networks.
What is missing (so far) is the constraint and inference layer.

> Again, in the interests of world peace and
> harmony, this is not intended as a diss or put-down of TMs -- there
> are other things that TMs will do better than an approach like OWL.

Agreed :)  But could you expand on what you expect TM to express better than OWL?

> OWL is a language and framework for representing ontological knowledge
> and information about the way that the world is structured and fits
> together. As such it has a well-defined semantics (in terms of a model
> theory) that allows us to know precisely what we mean when we use the
> constructors in the language to define a particular class of
> individuals.
>
> Turning back to an old example from KR, what does the following mean?
>
>    -------------             ---------
>    | telephone |--- colour ---| black |
>    -------------             ---------
>
> o Telephones are black?
> o All telephones are black?
> o Telephones can be black?
> o There is a telephone which is black?
>
> The crucial point with OWL is that we have a well-defined notion of
> what it means when we say:
>
> telephone -> all colour black
>
> i.e. all telephones can *only* have the colour black.

Well. Maybe we should use more astronomical examples :)

Anyway. I don't see why TM could not express that by using specific topics and
associations.

Define a topic representing the class "telephone"
Define a topic representing the concept "colour'
Define a topic representing the colour "black"
Define a topic representing the concept "class"
Define a topic representing the association type "class_colour"

Every one of the above being defined as a Published Subject if possible.

Then define an instance of the association-type "class_colour"
where "telephone" plays the role of "class" and "black" plays the role of "colour"

class_colour (class: "telephone" ; colour: "black")

And, at will, constrain the domain of validity of this assertion by a convenient scope,
like "1930, USSR" ;-)

Is there less semantics in the TM expression than in the OWL expression?
Let alone the capacity of the latter to draw inferences ...

Bernard

-------------------------------------------------------------------
Bernard Vatant
Consultant - Mondeca
www.mondeca.com
Chair - OASIS TM PubSubj Technical Committee
www.oasis-open.org/committees/tm-pubsubj/
-------------------------------------------------------------------

From - Fri Oct  4 14:37:58 2002
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Date: Fri, 4 Oct 2002 08:23:41 -0400 (EDT)
From: Kirk Borne <borne@rings.gsfc.nasa.gov>
Reply-To: Kirk Borne <borne@rings.gsfc.nasa.gov>
Subject: Contect Interchange Mediation, etc.
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Hi.  FYI ...


Stuart Madnick (MIT) presented a very interesting talk at
NASA-Goddard this week on intelligent information aggregation.
Though he was speaking primarily from a business-world perspective,
there were many aspects of his talk that were very relevant to our
VO discussions, including aggregators and their related semantics.
What are aggregators?  Madnick said ....

   "Aggregators are entities that collect information from a 
    wide range of sources, with or without prior agreement, and 
    add value through post-aggregation services.  Major technical 
    challenges relate to the automated and intelligent integration
    of information.  New Web-page extraction tools, context sensitive 
    mediators, and agent technologies have greatly reduced the barriers 
    to constructing aggregators."

I found a list of papers by his MIT research group.  He mentioned 
one paper in particular -- "The Misguided Silver Bullet: What XML 
Will and Will NOT Do to Help Information Integration" -- which is 
paper number 111 on this interesting list of papers ...

         http://ebusiness.mit.edu/research/papers-number.html

There appear to be a few other interesting-looking papers on information
aggregation, semantics, ontologies, and taxonomies.

- Kirk
+------------------------------------+-------------------------------------+
| Dr. Kirk D. Borne                  | mailto:Kirk.Borne@gsfc.nasa.gov     |
| Institute for Science & Technology, Raytheon (IST@R)                     |
| NASA Goddard Space Flight Center   |                                     |
| Astrophysics Data Facility         | Phone: 301-286-0696                 |
| Code 631                           |     or 301-286-2772:Kathy Starling  |
| Greenbelt, MD  20771               | FAX:   301-286-1771                 |
+------------------------------------+-------------------------------------+
  US Virtual Observatory:  http://us-vo.org/
  Staff page:     http://rings.gsfc.nasa.gov/~borne/bio_borne_kirk.html
  Raytheon ITSS:  http://itss.raytheon.com/capabilities/

From - Fri Oct  4 12:16:08 2002
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Date: Fri, 4 Oct 2002 10:22:56 +0100 (GMT Daylight Time)
From: Sean Bechhofer <seanb@cs.man.ac.uk>
To: Tony Linde <tol@star.le.ac.uk>
cc: semantics@us-vo.org, Phillip Lord <p.lord@russet.org.uk>
Subject: RE: Where to start (was: Ontology for Dummies)
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On Wed, 2 Oct 2002, Tony Linde wrote:

> Welcome Steve.
>
> I don't want to spark an OntoWar, but could people (participants and
> lurkers alike) say if there is any significant difference between a
> topic map approach to ontologies and an OWL (or its ancestors') language
> approach.

Not sure if I qualify as lurker or participanet, but here goes! I'd
certainly like to avoid an OntoWar too -- so it's perhaps worth saying
that the following is purely *my* opinion and should not necessarily be
taken as representative of the entire DAML+OIL/OWL community. There, that
should do it :-).

Topic Maps and OWL (hereafter referred to as TM and OWL to save
typing) *are* different. This is not to say that one is "better" than
the other though -- they are *different*, and are suitable for
different purposes. TMs provide a kind of model of "back of the book
indexes", a way of indexing particular occurrences of topics or
subjects. In my opinion, they are not a framework for representing
ontologies (** see below). Again, in the interests of world peace and
harmony, this is not intended as a diss or put-down of TMs -- there
are other things that TMs will do better than an approach like OWL.

OWL is a language and framework for representing ontological knowledge
and information about the way that the world is structured and fits
together. As such it has a well-defined semantics (in terms of a model
theory) that allows us to know precisely what we mean when we use the
constructors in the language to define a particular class of
individuals.

Turning back to an old example from KR, what does the following mean?

   -------------             ---------
   | telephone |--- colour ---| black |
   -------------             ---------

o Telephones are black?
o All telephones are black?
o Telephones can be black?
o There is a telephone which is black?

The crucial point with OWL is that we have a well-defined notion of
what it means when we say:

telephone -> all colour black

i.e. all telephones can *only* have the colour black.

Drawing comparisons between TMs and RDF is not the same as drawing
comparisons between TMs and OWL. The language that OWL provides for
describing the domain is significantly richer than that provided by
RDF(S). RDF(S) effectively provides us with a taxonomic hierarchy and some
relationships between classes. We can't actually *define* things or talk
about, for example, the class of planets that have particular properties
(or at least not in a way that then allows us to draw any *inferences*
from that information, which is one of the key aspects of OWL). There's
very little inference that can be drawn, other than computing the
transitive closure of the hierarchies (i.e. running up and down the
subClassOf relationship).

As one of my colleagues has pointed out, it's relatively easy in all
these representations to put information *in*, but in order to get
anything other than non-trivial information *out*, you need the
semantics.

(**) Of course, we can always get into a discussion about what an
ontology is or isn't, which could go on for a long time :-). For the
purposes of this discussion though, I'm claiming that an ontology is
more than just a taxonomy or hierarchy, but has additional information
about the properties or definitions of the classes that you're talking
about. This is of course, not to dismiss taxonomies and simple
controlled vocabularies -- one can get a long way with such things. If
you look at the experiences of the medical and biology communities,
however, maintaining and constructing such vocabularies becomes
problematic when the models get large. This is where an approach using
a richer language and computational support can benefit (e.g. see the
experiences of GALEN (http://www.opengalen.org), and more recently
using DAML+OIL, GONG (http://gong.man.ac.uk)).

Cheers,

	Sean

-- 
Sean Bechhofer
seanb@cs.man.ac.uk
http://www.cs.man.ac.uk/~seanb


From - Thu Oct  3 16:08:04 2002
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At 14:00 02/10/02 +0100, Tony Linde wrote:
>I don't want to spark an OntoWar,

Good, because I for one wouldn't participate :-)

>but could people (participants and
>lurkers alike) say if there is any significant difference between a
>topic map approach to ontologies and an OWL (or its ancestors') language
>approach.

There are differences, but I don't believe they are significant for the
VO work at this stage. Although Ontopia is a topic map company, our
philosophy is to look for synergies; for example, we often use RDF in
combination with topic maps. The reason we can do so is because we use
published subjects to establish semantics in a manner that works across
various formalisms.

For those that are interested, I have tried to summarize some thoughts
on the relationship between topic maps and RDF in my "Ten Theses on Topic
Maps and RDF" at

   http://www.ontopia.net/topicmaps/materials/rdf.html

Steve

--
Steve Pepper, Chief Executive Officer <pepper@ontopia.net>
Convenor, ISO/IEC JTC1/SC34/WG3  Editor, XTM (XML Topic Maps)
Ontopia AS, Waldemar Thranes gt. 98, N-0175 Oslo, Norway.
http://www.ontopia.net/ phone: +47-23233080 GSM: +47-90827246

From - Wed Oct  2 17:44:25 2002
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From: "Tony Linde" <tol@star.le.ac.uk>
To: <semantics@us-vo.org>
Subject: RE: Where to start (was: Ontology for Dummies)
Date: Wed, 2 Oct 2002 15:27:42 +0100
Organization: University of Leicester
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Roy et al,

My own goal (apart from those of engaging in stimulating discussion and
enjoying the virtual company of interesting people!) from the work that
lies behind and drives this discussion is to demonstrate the practical
applicability of an ontological approach to:

 - VO Registry:
    - a sort of cross between your (1) & (3)
 - VO Workflow
    - bit like your (2)
    - but more expert guidance in putting jobs together

But to do any of this, I think, requires more knowledge about ontologies
(like the ontological distance discussion) and then some help in setting
up the trials.

Cheers,
Tony. 

> -----Original Message-----
> From: owner-semantics@us-vo.org 
> [mailto:owner-semantics@us-vo.org] On Behalf Of Roy Williams
> Sent: 02 October 2002 15:13
> To: semantics@us-vo.org
> Subject: Re: Where to start (was: Ontology for Dummies)
> 
> 
> Tony et al
> 
> What I am looking for from this discussion is a project that 
> brings together astronomical data and  what I will call 
> Knowledge Engineering. Something where a 6-month effort by 
> one person leads to a demo where the viewer would be a bit 
> impressed at what the Virtual Observatory can do, (even if 
> that person is still an astronomer in the Fortran club!)
> 
> It may be that the topics under management are:
> 
> (1) Physical objects, such as galaxies. Of course NED and 
> Simbad already do a good job there, and they have been doing 
> that for years. Is there a capability that can be added to NED?
> 
> (2) Data types a la UCD. "Find me services that consume 
> Orbital Eccentricity and also a Light Curve". "Given a table 
> that has Johnson Photometry, can this be converted to Gunn 
> Photometry?"
> 
> (3) Services and Published Data -- a VO registry. Yellow 
> pages and classifications of data providers and their data, 
> but without employing a full-time librarian. How can someone 
> publish their own data/services into this system?
> 
> How can we see something good from Knowledge Engineering 
> without investing many years and millions of currency units?
> 
> Roy
> 
> ---------
> Caltech Center for Advanced Computing Research
> mail    roy@cacr.caltech.edu
> voice   +1 626 395 3670
> 

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From: "Roy Williams" <roy@cacr.caltech.edu>
To: <semantics@us-vo.org>
References: <000901c26a1a$1ded7370$b524d28f@bunyip>
Subject: Re: Where to start (was: Ontology for Dummies)
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Tony et al

What I am looking for from this discussion is a project that brings
together astronomical data and  what I will call Knowledge Engineering.
Something where a 6-month effort by one person leads to a demo where the
viewer would be a bit impressed at what the Virtual Observatory can do,
(even if that person is still an astronomer in the Fortran club!)

It may be that the topics under management are:

(1) Physical objects, such as galaxies. Of course NED and Simbad already
do a good job there, and they have been doing that for years. Is there a
capability that can be added to NED?

(2) Data types a la UCD. "Find me services that consume Orbital
Eccentricity and also a Light Curve". "Given a table that has Johnson
Photometry, can this be converted to Gunn Photometry?"

(3) Services and Published Data -- a VO registry. Yellow pages and
classifications of data providers and their data, but without employing
a full-time librarian. How can someone publish their own data/services
into this system?

How can we see something good from Knowledge Engineering without
investing many years and millions of currency units?

Roy

---------
Caltech Center for Advanced Computing Research
mail    roy@cacr.caltech.edu
voice   +1 626 395 3670

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Date: Wed, 2 Oct 2002 09:49:56 -0400 (EDT)
From: Kirk Borne <borne@rings.gsfc.nasa.gov>
Reply-To: Kirk Borne <borne@rings.gsfc.nasa.gov>
Subject: RE: Where to start (was: Ontology for Dummies)
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Thank you Tony.  I can live with that, and (in fact) that is what
I had hoped to receive from this list.

- Kirk


> From: "Tony Linde" <tol@star.le.ac.uk>
> To: <semantics@us-vo.org>
> Subject: RE: Where to start (was: Ontology for Dummies)
> Date: Wed, 2 Oct 2002 14:46:32 +0100
> 
> Kirk, the mailing list was partly set up as the latter. But the problems
> we face and our need for practical solutions are the same as those of
> any other scientific project looking at the issue of ontologies. It is
> natural that we should work with other branches of e-Science.
> (Especially in the case of AstroGrid; we have close links with myGrid, a
> bioinformatics project under the same umbrella of 'UK e-Science'.)
> 
> If this interworking means that we have to explain a little astronomy to
> the bioinformaticians and they have to explain some genetics in return
> then that can only be to our mutual benefit.
> 
> Cheers,
> Tony. 
> __
> Tony Linde                       Phone:  +44 (0)116 223 1292
> AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
> Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
> University of Leicester          Email:  tol@star.le.ac.uk
> Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
>  
> 
> > -----Original Message-----
> > From: Kirk Borne [mailto:borne@rings.gsfc.nasa.gov] 
> > Sent: 02 October 2002 14:12
> > To: semantics@us-vo.org; tol@star.le.ac.uk
> > Cc: seanb@cs.man.ac.uk; p.lord@russet.org.uk
> > Subject: RE: Where to start (was: Ontology for Dummies)
> > 
> > 
> > Hi.  As a 'lurker', I would like to ask :  is this a mailing 
> > list for Ontology/Semantics discussions or is it a list for 
> > Virtual Observatory discussions related to 
> > ontology/semantics?  I thought that it was the latter.
> > 
> > - Kirk
> > +------------------------------------+------------------------
> > -------------+
> > | Dr. Kirk D. Borne                  | 
> > mailto:Kirk.Borne@gsfc.nasa.gov     |
> > | Institute for Science & Technology, Raytheon (IST@R)        
> >              |
> > | NASA Goddard Space Flight Center   |                        
> >              |
> > | Astrophysics Data Facility         | Phone: 301-286-0696    
> >              |
> > | Code 631                           |     or 
> > 301-286-2772:Kathy Starling  |
> > | Greenbelt, MD  20771               | FAX:   301-286-1771    
> >              |
> > +------------------------------------+------------------------
> > -------------+
> >   US Virtual Observatory:  http://us-vo.org/
> >   Staff page:     
> > http://rings.gsfc.nasa.gov/~borne/bio_borne_kirk.html
> >   Raytheon ITSS:  http://itss.raytheon.com/capabilities/
> > 
> > 
> > > From: "Tony Linde" <tol@star.le.ac.uk>
> > > To: <semantics@us-vo.org>
> > > Cc: "'seanb'" <seanb@cs.man.ac.uk>, "Phillip Lord" 
> > > <p.lord@russet.org.uk>
> > > Subject: RE: Where to start (was: Ontology for Dummies)
> > > Date: Wed, 2 Oct 2002 14:00:16 +0100
> > > 
> > > Welcome Steve.
> > > 
> > > I don't want to spark an OntoWar, but could people 
> > (participants and 
> > > lurkers alike) say if there is any significant difference between a 
> > > topic map approach to ontologies and an OWL (or its ancestors') 
> > > language approach.
> > > 
> > > Are there other approaches of significance?
> > > 
> > > Cheers,
> > > Tony.
> > > 
> > > > -----Original Message-----
> > > > From: owner-semantics@us-vo.org
> > > > [mailto:owner-semantics@us-vo.org] On Behalf Of Steve Pepper
> > > > Sent: 02 October 2002 12:47
> > > > To: semantics@us-vo.org
> > > > Subject: Where to start (was: Ontology for Dummies)
> > > > 
> > > > 
> > > > Thanks to Ashish Mahabal for bringing this forum to my attention.
> > > > 
> > > > Tony Linde wrote (about "Ontology for Dummies"):
> > > > >I know, there isn't such a book, so what can we (the
> > > > non-experts) have
> > > > >to get us up to speed. Can we come up with suggested texts
> > > > that would
> > > > >take a non-expert from basics through to understanding why
> > > > and how to
> > > > >encode a subject domain ontology and why and how to use 
> > it in one 
> > > > >or
> > > > >more applications.
> > > > 
> > > > Here are a couple of papers that I've found useful:
> > > > 
> > > > * Deborah McGuinness' chapter in the forthcoming "Spinning
> > > > the Semantic
> > > >    Web", called "Ontologies Come of Age":
> > > > 
> > > >    
> > > > http://www.ksl.stanford.edu/people/dlm/papers/ontologies-come-
> > > > of-age-mit-press-(with-citation).htm
> > > > 
> > > > * "Ontology Development 101: A Guide to Creating Your 
> > First Ontology"
> > > >    by Natalya F. Noy  and Deborah L. McGuinness
> > > > 
> > > >    
> > > > http://protege.stanford.edu/publications/ontology_development/
> > > > ontology101-noy-mcguinness.html
> > > > 
> > > > I don't know of anything that discusses ontology design with
> > > > specific reference to topic maps (apart from internal course 
> > > > material here at Ontopia), but the principles are pretty 
> > > > simple. If you've read "The TAO of Topic Maps" [1] you know 
> > > > that the core concepts in topic maps are Topics, 
> > > > Associations, and Occurrences (hence "TAO"). Each of these 
> > > > can be classified by type (topic types, association types, 
> > > > occurrence types)
> > > > - and types are themselves also topics...
> > > > 
> > > > Thus "Puccini" is a topic of type "composer", and "composer"
> > > > is also a topic. The association (relationship) between the 
> > > > topic "Puccini" and the topic "Tosca" (which is of type 
> > > > "opera") is of type "composed by", which is also a topic. An 
> > > > information resource containing the libretto of Tosca would 
> > > > be an occurrence (of type "libretto") of the topic "Tosca".
> > > > 
> > > > In this example, the (typing) topics "composer", "opera",
> > > > "composed by" and "libretto" constitute the ontology -- or 
> > > > what some people term the "upper ontology". The "lower 
> > > > ontology" consists of the individuals, "Puccini", "Tosca" etc.
> > > > 
> > > > (Apologies for not being able to give you examples from your
> > > > own domain: The only "stars" I am familiar with are ones like 
> > > > Maria Callas and Pavarotti :-)
> > > > 
> > > > It seems to me (correct me if I am wrong!) that what this
> > > > initiative needs is
> > > > 
> > > > (1) agreement, as far as possible, on a common upper 
> > ontology and how
> > > >      to *identify* the classes it consists of
> > > > (2) agreement on how to identify a useful common subset of known
> > > >      individuals, but without (necessarily) assigning those
> > > > individuals
> > > >      to classes (since this might be controversial).
> > > > 
> > > > As soon as you have that, everyone can start making their own
> > > > assertions about any of the subjects in question in such a 
> > > > way that knowledge about them can be aggregated, shared 
> > and reused.
> > > > 
> > > > I would advise you to apply the KISS principle. You will
> > > > experience an almost irresistible temptation to bite off more 
> > > > than you can chew, to "overmodel", to get embroiled in 
> > > > endless discussions about almost unresolvable details. Resist 
> > > > that temptation! Agree on the minimal common subset that is 
> > > > actually useful and extend it later as necessary. In 
> > > > particular, don't bother at this stage to try and express 
> > > > complex constraints on the classes you identify for the upper 
> > > > ontology.
> > > > 
> > > > Finally, I would advise you to look seriously at the
> > > > Published Subject initiatives taking place under the auspices 
> > > > of OASIS:
> > > > 
> > >     http://www.oasis-open.org/committees/tm-pubsubj/
> > > 
> > > You will achieve a lot in a short time if you concentrate 
> > on defining 
> > > published subjects for your upper and lower ontologies. Among other 
> > > things, it will make the choice of knowledge representation 
> > formalism 
> > > less important, since published subjects allow multiple 
> > formalisms to 
> > > interoperate. If anyone is interested in pursuing such a 
> > course, say 
> > > so (in a new thread) and Bernard Vatant and I can explain how to go 
> > > about it.
> > > 
> > > I wish you luck in your endeavours and will continue to 
> > lurk here in 
> > > case I can be of use.
> > > 
> > > Steve
> > > 
> > > [1] http://www.ontopia.net/topicmaps/materials/tao.html
> > > 
> > > --
> > > Steve Pepper, Chief Executive Officer <pepper@ontopia.net> 
> > Convenor, 
> > > ISO/IEC JTC1/SC34/WG3  Editor, XTM (XML Topic Maps) Ontopia AS, 
> > > Waldemar Thranes gt. 98, N-0175 Oslo, Norway. 
> http://www.ontopia.net/ 
> > phone:
> > +47-23233080 GSM: +47-90827246

From - Wed Oct  2 17:44:25 2002
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From: "Tony Linde" <tol@star.le.ac.uk>
To: <semantics@us-vo.org>
Subject: RE: Where to start (was: Ontology for Dummies)
Date: Wed, 2 Oct 2002 14:46:32 +0100
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Kirk, the mailing list was partly set up as the latter. But the problems
we face and our need for practical solutions are the same as those of
any other scientific project looking at the issue of ontologies. It is
natural that we should work with other branches of e-Science.
(Especially in the case of AstroGrid; we have close links with myGrid, a
bioinformatics project under the same umbrella of 'UK e-Science'.)

If this interworking means that we have to explain a little astronomy to
the bioinformaticians and they have to explain some genetics in return
then that can only be to our mutual benefit.

Cheers,
Tony. 
__
Tony Linde                       Phone:  +44 (0)116 223 1292
AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
University of Leicester          Email:  tol@star.le.ac.uk
Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
 

> -----Original Message-----
> From: Kirk Borne [mailto:borne@rings.gsfc.nasa.gov] 
> Sent: 02 October 2002 14:12
> To: semantics@us-vo.org; tol@star.le.ac.uk
> Cc: seanb@cs.man.ac.uk; p.lord@russet.org.uk
> Subject: RE: Where to start (was: Ontology for Dummies)
> 
> 
> Hi.  As a 'lurker', I would like to ask :  is this a mailing 
> list for Ontology/Semantics discussions or is it a list for 
> Virtual Observatory discussions related to 
> ontology/semantics?  I thought that it was the latter.
> 
> - Kirk
> +------------------------------------+------------------------
> -------------+
> | Dr. Kirk D. Borne                  | 
> mailto:Kirk.Borne@gsfc.nasa.gov     |
> | Institute for Science & Technology, Raytheon (IST@R)        
>              |
> | NASA Goddard Space Flight Center   |                        
>              |
> | Astrophysics Data Facility         | Phone: 301-286-0696    
>              |
> | Code 631                           |     or 
> 301-286-2772:Kathy Starling  |
> | Greenbelt, MD  20771               | FAX:   301-286-1771    
>              |
> +------------------------------------+------------------------
> -------------+
>   US Virtual Observatory:  http://us-vo.org/
>   Staff page:     
> http://rings.gsfc.nasa.gov/~borne/bio_borne_kirk.html
>   Raytheon ITSS:  http://itss.raytheon.com/capabilities/
> 
> 
> > From: "Tony Linde" <tol@star.le.ac.uk>
> > To: <semantics@us-vo.org>
> > Cc: "'seanb'" <seanb@cs.man.ac.uk>, "Phillip Lord" 
> > <p.lord@russet.org.uk>
> > Subject: RE: Where to start (was: Ontology for Dummies)
> > Date: Wed, 2 Oct 2002 14:00:16 +0100
> > 
> > Welcome Steve.
> > 
> > I don't want to spark an OntoWar, but could people 
> (participants and 
> > lurkers alike) say if there is any significant difference between a 
> > topic map approach to ontologies and an OWL (or its ancestors') 
> > language approach.
> > 
> > Are there other approaches of significance?
> > 
> > Cheers,
> > Tony.
> > 
> > > -----Original Message-----
> > > From: owner-semantics@us-vo.org
> > > [mailto:owner-semantics@us-vo.org] On Behalf Of Steve Pepper
> > > Sent: 02 October 2002 12:47
> > > To: semantics@us-vo.org
> > > Subject: Where to start (was: Ontology for Dummies)
> > > 
> > > 
> > > Thanks to Ashish Mahabal for bringing this forum to my attention.
> > > 
> > > Tony Linde wrote (about "Ontology for Dummies"):
> > > >I know, there isn't such a book, so what can we (the
> > > non-experts) have
> > > >to get us up to speed. Can we come up with suggested texts
> > > that would
> > > >take a non-expert from basics through to understanding why
> > > and how to
> > > >encode a subject domain ontology and why and how to use 
> it in one 
> > > >or
> > > >more applications.
> > > 
> > > Here are a couple of papers that I've found useful:
> > > 
> > > * Deborah McGuinness' chapter in the forthcoming "Spinning
> > > the Semantic
> > >    Web", called "Ontologies Come of Age":
> > > 
> > >    
> > > http://www.ksl.stanford.edu/people/dlm/papers/ontologies-come-
> > > of-age-mit-press-(with-citation).htm
> > > 
> > > * "Ontology Development 101: A Guide to Creating Your 
> First Ontology"
> > >    by Natalya F. Noy  and Deborah L. McGuinness
> > > 
> > >    
> > > http://protege.stanford.edu/publications/ontology_development/
> > > ontology101-noy-mcguinness.html
> > > 
> > > I don't know of anything that discusses ontology design with
> > > specific reference to topic maps (apart from internal course 
> > > material here at Ontopia), but the principles are pretty 
> > > simple. If you've read "The TAO of Topic Maps" [1] you know 
> > > that the core concepts in topic maps are Topics, 
> > > Associations, and Occurrences (hence "TAO"). Each of these 
> > > can be classified by type (topic types, association types, 
> > > occurrence types)
> > > - and types are themselves also topics...
> > > 
> > > Thus "Puccini" is a topic of type "composer", and "composer"
> > > is also a topic. The association (relationship) between the 
> > > topic "Puccini" and the topic "Tosca" (which is of type 
> > > "opera") is of type "composed by", which is also a topic. An 
> > > information resource containing the libretto of Tosca would 
> > > be an occurrence (of type "libretto") of the topic "Tosca".
> > > 
> > > In this example, the (typing) topics "composer", "opera",
> > > "composed by" and "libretto" constitute the ontology -- or 
> > > what some people term the "upper ontology". The "lower 
> > > ontology" consists of the individuals, "Puccini", "Tosca" etc.
> > > 
> > > (Apologies for not being able to give you examples from your
> > > own domain: The only "stars" I am familiar with are ones like 
> > > Maria Callas and Pavarotti :-)
> > > 
> > > It seems to me (correct me if I am wrong!) that what this
> > > initiative needs is
> > > 
> > > (1) agreement, as far as possible, on a common upper 
> ontology and how
> > >      to *identify* the classes it consists of
> > > (2) agreement on how to identify a useful common subset of known
> > >      individuals, but without (necessarily) assigning those
> > > individuals
> > >      to classes (since this might be controversial).
> > > 
> > > As soon as you have that, everyone can start making their own
> > > assertions about any of the subjects in question in such a 
> > > way that knowledge about them can be aggregated, shared 
> and reused.
> > > 
> > > I would advise you to apply the KISS principle. You will
> > > experience an almost irresistible temptation to bite off more 
> > > than you can chew, to "overmodel", to get embroiled in 
> > > endless discussions about almost unresolvable details. Resist 
> > > that temptation! Agree on the minimal common subset that is 
> > > actually useful and extend it later as necessary. In 
> > > particular, don't bother at this stage to try and express 
> > > complex constraints on the classes you identify for the upper 
> > > ontology.
> > > 
> > > Finally, I would advise you to look seriously at the
> > > Published Subject initiatives taking place under the auspices 
> > > of OASIS:
> > > 
> >     http://www.oasis-open.org/committees/tm-pubsubj/
> > 
> > You will achieve a lot in a short time if you concentrate 
> on defining 
> > published subjects for your upper and lower ontologies. Among other 
> > things, it will make the choice of knowledge representation 
> formalism 
> > less important, since published subjects allow multiple 
> formalisms to 
> > interoperate. If anyone is interested in pursuing such a 
> course, say 
> > so (in a new thread) and Bernard Vatant and I can explain how to go 
> > about it.
> > 
> > I wish you luck in your endeavours and will continue to 
> lurk here in 
> > case I can be of use.
> > 
> > Steve
> > 
> > [1] http://www.ontopia.net/topicmaps/materials/tao.html
> > 
> > --
> > Steve Pepper, Chief Executive Officer <pepper@ontopia.net> 
> Convenor, 
> > ISO/IEC JTC1/SC34/WG3  Editor, XTM (XML Topic Maps) Ontopia AS, 
> > Waldemar Thranes gt. 98, N-0175 Oslo, Norway. 
http://www.ontopia.net/ 
> phone:
> +47-23233080 GSM: +47-90827246

From - Wed Oct  2 10:56:02 2002
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Date: Sat, 28 Sep 2002 17:54:39 -0700
To: Anita Richards <amsr@jb.man.ac.uk>
From: Reagan Moore <moore@sdsc.edu>
Subject: Re: Taxonomy issues
Cc: semantics@us-vo.org
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Anita:
You are correctly describing the situation.

One approach is to characterize semantic labels by the community that 
uses a particular definition.  This allows definitions to change in 
time and to change between communities.

A second approach is provide a "learning context" (term used in the 
education community) for each semantic label.  The "learning context" 
defines the related semantic labels and identifies relationships 
between the labels that are appropriate for a particular community. 
In the education context, a semantic label such as "sun" has a less 
sophisticated meaning when presented in the 3rd grade, than it does 
as a graduate student.  The "learning context" is a function of the 
level of sophistication of the student.

Similarly, the "learning context" for terms in astronomy depend upon 
the particular sub-discipline.  An ontology can be used to define the 
different "learning contexts" associated with the semantic labels 
used by each of the sub-disciplines, without requiring that everyone 
agree on a single exact meaning for each term.

Reagan Moore



>Thanks to Carole and Sean, I think I understand what I was trying to say
>earlier better now....
>
>
>> Of course in biology there are different classifications and
>> definitions -- there is no standard definition for what a gene is for
>> example. DAML+OIL allows multiple definitions, and will report on
>> definitions that are inconsistent. What you do then is an interesting
>> story. And it depends on what you want to use the ontology / taxonomy
>> for.
>
>It is much worse in astronomy though because no-one dies or even sues if
>we define something in ten different ways...  So I do not think the people
>constructing ontologies should have to sort out genuine inconsistencies
>(just avoid accidentally creating more ourselves!)
>
>> So, onto the subject of contradictions and inconsistency. I say that
>> all Widgets are blue, while you think that Widgets are red. So in our
>> ontology, I say:
>>
>>   Widget -> colour blue
>>
>> and you say
>>
>>   Widget -> colour red
>>
>> If we also have some constraints that say that blue and red are
>> mutually exclusive, then we have arrived at a contradiction.
>
>This implies that we should avoid mutually exclusive definitions within an
>ontology for astronomy, because people can disagree about definitions, or
>definitions can change with time.  For example, an optical astronomer
>might say that all stars with an emission line at 500 nm is a green fairy,
>and those with a line at 700 nm are red fairies.  A radio astromoner might
>then use an insensitive survey to find that only red fairies had radio
>emission and classify all radio stars as red fairies.  However if green
>fairies do have weak radio emission, some radio stars in a more sensitive
>survey could be misclassified.
>
>So, suppose a star cannot actually be both, we (as in the ontology
>authors) do not want to have to decide, and we do not want to throw out
>the information either.
>
>I suppose this is really the 'individual' case, but there are also cases
>of contradictory definitions of precisely measured properties, e.g.
>whether a red fairy is a variable star with a period of <400 days or <350
>days and a green fairy has a period of >400 or >350 days.....
>
>But I think the implications for an ontology user are the same: if I was
>searching for all the green fairies in a galaxy, I would want a warning
>about those which were classified as red and as green in radio and optical
>catalogues respectively as well as those which were classified according
>to an ambiguous definition (periods of around 375 days).
>
>What I think would be useful is if we could constrain properties to be
>"contradictory" as a description, of perhaps just as "linked", so that any
>query which involved returning a description or list of (a) green
>fairy(ies)  would automatically note any also classified as red....
>
>> One solution to this is to use the classification as a "conceptual
>> coat rack" and hang "extralogical" information off it. This is the
>> kind of thing that the RuleML initiative is aimed at. This then allows
>> us to state things about OWL classes that are not necessarily part of
>> the ontological or intensional definition of the class, but which we
>> want to make available to applications.
>
>Um, is that similar to what I am suggesting above?
>
>
>
>- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
>Dr. Anita M. S. Richards, AVO Astronomer
>MERLIN/VLBI National Facility, University of Manchester,
>Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, U.K.
>tel +44 (0)1477 572683 (direct); 571321 (switchboard); 571618 (fax).

From - Wed Oct  2 17:44:25 2002
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Date: Wed, 2 Oct 2002 09:11:59 -0400 (EDT)
From: Kirk Borne <borne@rings.gsfc.nasa.gov>
Reply-To: Kirk Borne <borne@rings.gsfc.nasa.gov>
Subject: RE: Where to start (was: Ontology for Dummies)
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Hi.  As a 'lurker', I would like to ask :  is this a mailing list
for Ontology/Semantics discussions or is it a list for Virtual
Observatory discussions related to ontology/semantics?  I thought
that it was the latter.

- Kirk
+------------------------------------+-------------------------------------+
| Dr. Kirk D. Borne                  | mailto:Kirk.Borne@gsfc.nasa.gov     |
| Institute for Science & Technology, Raytheon (IST@R)                     |
| NASA Goddard Space Flight Center   |                                     |
| Astrophysics Data Facility         | Phone: 301-286-0696                 |
| Code 631                           |     or 301-286-2772:Kathy Starling  |
| Greenbelt, MD  20771               | FAX:   301-286-1771                 |
+------------------------------------+-------------------------------------+
  US Virtual Observatory:  http://us-vo.org/
  Staff page:     http://rings.gsfc.nasa.gov/~borne/bio_borne_kirk.html
  Raytheon ITSS:  http://itss.raytheon.com/capabilities/


> From: "Tony Linde" <tol@star.le.ac.uk>
> To: <semantics@us-vo.org>
> Cc: "'seanb'" <seanb@cs.man.ac.uk>, "Phillip Lord" <p.lord@russet.org.uk>
> Subject: RE: Where to start (was: Ontology for Dummies)
> Date: Wed, 2 Oct 2002 14:00:16 +0100
> 
> Welcome Steve.
> 
> I don't want to spark an OntoWar, but could people (participants and
> lurkers alike) say if there is any significant difference between a
> topic map approach to ontologies and an OWL (or its ancestors') language
> approach.
> 
> Are there other approaches of significance?
> 
> Cheers,
> Tony. 
> 
> > -----Original Message-----
> > From: owner-semantics@us-vo.org 
> > [mailto:owner-semantics@us-vo.org] On Behalf Of Steve Pepper
> > Sent: 02 October 2002 12:47
> > To: semantics@us-vo.org
> > Subject: Where to start (was: Ontology for Dummies)
> > 
> > 
> > Thanks to Ashish Mahabal for bringing this forum to my attention.
> > 
> > Tony Linde wrote (about "Ontology for Dummies"):
> > >I know, there isn't such a book, so what can we (the 
> > non-experts) have 
> > >to get us up to speed. Can we come up with suggested texts 
> > that would 
> > >take a non-expert from basics through to understanding why 
> > and how to 
> > >encode a subject domain ontology and why and how to use it in one or 
> > >more applications.
> > 
> > Here are a couple of papers that I've found useful:
> > 
> > * Deborah McGuinness' chapter in the forthcoming "Spinning 
> > the Semantic
> >    Web", called "Ontologies Come of Age":
> > 
> >    
> > http://www.ksl.stanford.edu/people/dlm/papers/ontologies-come-
> > of-age-mit-press-(with-citation).htm
> > 
> > * "Ontology Development 101: A Guide to Creating Your First Ontology"
> >    by Natalya F. Noy  and Deborah L. McGuinness
> > 
> >    
> > http://protege.stanford.edu/publications/ontology_development/
> > ontology101-noy-mcguinness.html
> > 
> > I don't know of anything that discusses ontology design with 
> > specific reference to topic maps (apart from internal course 
> > material here at Ontopia), but the principles are pretty 
> > simple. If you've read "The TAO of Topic Maps" [1] you know 
> > that the core concepts in topic maps are Topics, 
> > Associations, and Occurrences (hence "TAO"). Each of these 
> > can be classified by type (topic types, association types, 
> > occurrence types)
> > - and types are themselves also topics...
> > 
> > Thus "Puccini" is a topic of type "composer", and "composer" 
> > is also a topic. The association (relationship) between the 
> > topic "Puccini" and the topic "Tosca" (which is of type 
> > "opera") is of type "composed by", which is also a topic. An 
> > information resource containing the libretto of Tosca would 
> > be an occurrence (of type "libretto") of the topic "Tosca".
> > 
> > In this example, the (typing) topics "composer", "opera", 
> > "composed by" and "libretto" constitute the ontology -- or 
> > what some people term the "upper ontology". The "lower 
> > ontology" consists of the individuals, "Puccini", "Tosca" etc.
> > 
> > (Apologies for not being able to give you examples from your 
> > own domain: The only "stars" I am familiar with are ones like 
> > Maria Callas and Pavarotti :-)
> > 
> > It seems to me (correct me if I am wrong!) that what this 
> > initiative needs is
> > 
> > (1) agreement, as far as possible, on a common upper ontology and how
> >      to *identify* the classes it consists of
> > (2) agreement on how to identify a useful common subset of known
> >      individuals, but without (necessarily) assigning those 
> > individuals
> >      to classes (since this might be controversial).
> > 
> > As soon as you have that, everyone can start making their own 
> > assertions about any of the subjects in question in such a 
> > way that knowledge about them can be aggregated, shared and reused.
> > 
> > I would advise you to apply the KISS principle. You will 
> > experience an almost irresistible temptation to bite off more 
> > than you can chew, to "overmodel", to get embroiled in 
> > endless discussions about almost unresolvable details. Resist 
> > that temptation! Agree on the minimal common subset that is 
> > actually useful and extend it later as necessary. In 
> > particular, don't bother at this stage to try and express 
> > complex constraints on the classes you identify for the upper 
> > ontology.
> > 
> > Finally, I would advise you to look seriously at the 
> > Published Subject initiatives taking place under the auspices 
> > of OASIS:
> > 
>     http://www.oasis-open.org/committees/tm-pubsubj/
> 
> You will achieve a lot in a short time if you concentrate on defining
> published subjects for your upper and lower ontologies. Among other
> things, it will make the choice of knowledge representation formalism
> less important, since published subjects allow multiple formalisms to
> interoperate. If anyone is interested in pursuing such a course, say so
> (in a new thread) and Bernard Vatant and I can explain how to go about
> it.
> 
> I wish you luck in your endeavours and will continue to lurk here in
> case I can be of use.
> 
> Steve
> 
> [1] http://www.ontopia.net/topicmaps/materials/tao.html
> 
> --
> Steve Pepper, Chief Executive Officer <pepper@ontopia.net> Convenor,
> ISO/IEC JTC1/SC34/WG3  Editor, XTM (XML Topic Maps) Ontopia AS, Waldemar
> Thranes gt. 98, N-0175 Oslo, Norway. http://www.ontopia.net/ phone:
> +47-23233080 GSM: +47-90827246

From - Wed Oct  2 15:17:18 2002
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Subject: RE: Where to start (was: Ontology for Dummies)
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Welcome Steve.

I don't want to spark an OntoWar, but could people (participants and
lurkers alike) say if there is any significant difference between a
topic map approach to ontologies and an OWL (or its ancestors') language
approach.

Are there other approaches of significance?

Cheers,
Tony. 

> -----Original Message-----
> From: owner-semantics@us-vo.org 
> [mailto:owner-semantics@us-vo.org] On Behalf Of Steve Pepper
> Sent: 02 October 2002 12:47
> To: semantics@us-vo.org
> Subject: Where to start (was: Ontology for Dummies)
> 
> 
> Thanks to Ashish Mahabal for bringing this forum to my attention.
> 
> Tony Linde wrote (about "Ontology for Dummies"):
> >I know, there isn't such a book, so what can we (the 
> non-experts) have 
> >to get us up to speed. Can we come up with suggested texts 
> that would 
> >take a non-expert from basics through to understanding why 
> and how to 
> >encode a subject domain ontology and why and how to use it in one or 
> >more applications.
> 
> Here are a couple of papers that I've found useful:
> 
> * Deborah McGuinness' chapter in the forthcoming "Spinning 
> the Semantic
>    Web", called "Ontologies Come of Age":
> 
>    
> http://www.ksl.stanford.edu/people/dlm/papers/ontologies-come-
> of-age-mit-press-(with-citation).htm
> 
> * "Ontology Development 101: A Guide to Creating Your First Ontology"
>    by Natalya F. Noy  and Deborah L. McGuinness
> 
>    
> http://protege.stanford.edu/publications/ontology_development/
> ontology101-noy-mcguinness.html
> 
> I don't know of anything that discusses ontology design with 
> specific reference to topic maps (apart from internal course 
> material here at Ontopia), but the principles are pretty 
> simple. If you've read "The TAO of Topic Maps" [1] you know 
> that the core concepts in topic maps are Topics, 
> Associations, and Occurrences (hence "TAO"). Each of these 
> can be classified by type (topic types, association types, 
> occurrence types)
> - and types are themselves also topics...
> 
> Thus "Puccini" is a topic of type "composer", and "composer" 
> is also a topic. The association (relationship) between the 
> topic "Puccini" and the topic "Tosca" (which is of type 
> "opera") is of type "composed by", which is also a topic. An 
> information resource containing the libretto of Tosca would 
> be an occurrence (of type "libretto") of the topic "Tosca".
> 
> In this example, the (typing) topics "composer", "opera", 
> "composed by" and "libretto" constitute the ontology -- or 
> what some people term the "upper ontology". The "lower 
> ontology" consists of the individuals, "Puccini", "Tosca" etc.
> 
> (Apologies for not being able to give you examples from your 
> own domain: The only "stars" I am familiar with are ones like 
> Maria Callas and Pavarotti :-)
> 
> It seems to me (correct me if I am wrong!) that what this 
> initiative needs is
> 
> (1) agreement, as far as possible, on a common upper ontology and how
>      to *identify* the classes it consists of
> (2) agreement on how to identify a useful common subset of known
>      individuals, but without (necessarily) assigning those 
> individuals
>      to classes (since this might be controversial).
> 
> As soon as you have that, everyone can start making their own 
> assertions about any of the subjects in question in such a 
> way that knowledge about them can be aggregated, shared and reused.
> 
> I would advise you to apply the KISS principle. You will 
> experience an almost irresistible temptation to bite off more 
> than you can chew, to "overmodel", to get embroiled in 
> endless discussions about almost unresolvable details. Resist 
> that temptation! Agree on the minimal common subset that is 
> actually useful and extend it later as necessary. In 
> particular, don't bother at this stage to try and express 
> complex constraints on the classes you identify for the upper 
> ontology.
> 
> Finally, I would advise you to look seriously at the 
> Published Subject initiatives taking place under the auspices 
> of OASIS:
> 
    http://www.oasis-open.org/committees/tm-pubsubj/

You will achieve a lot in a short time if you concentrate on defining
published subjects for your upper and lower ontologies. Among other
things, it will make the choice of knowledge representation formalism
less important, since published subjects allow multiple formalisms to
interoperate. If anyone is interested in pursuing such a course, say so
(in a new thread) and Bernard Vatant and I can explain how to go about
it.

I wish you luck in your endeavours and will continue to lurk here in
case I can be of use.

Steve

[1] http://www.ontopia.net/topicmaps/materials/tao.html

--
Steve Pepper, Chief Executive Officer <pepper@ontopia.net> Convenor,
ISO/IEC JTC1/SC34/WG3  Editor, XTM (XML Topic Maps) Ontopia AS, Waldemar
Thranes gt. 98, N-0175 Oslo, Norway. http://www.ontopia.net/ phone:
+47-23233080 GSM: +47-90827246

From - Wed Oct  2 13:47:16 2002
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Date: Wed, 02 Oct 2002 13:47:15 +0200
To: semantics@us-vo.org
From: Steve Pepper <pepper@ontopia.net>
Subject: Where to start (was: Ontology for Dummies)
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Thanks to Ashish Mahabal for bringing this forum to my attention.

Tony Linde wrote (about "Ontology for Dummies"):
>I know, there isn't such a book, so what can we (the non-experts) have
>to get us up to speed. Can we come up with suggested texts that would
>take a non-expert from basics through to understanding why and how to
>encode a subject domain ontology and why and how to use it in one or
>more applications.

Here are a couple of papers that I've found useful:

* Deborah McGuinness' chapter in the forthcoming "Spinning the Semantic
   Web", called "Ontologies Come of Age":

   http://www.ksl.stanford.edu/people/dlm/papers/ontologies-come-of-age-mit-press-(with-citation).htm

* "Ontology Development 101: A Guide to Creating Your First Ontology"
   by Natalya F. Noy  and Deborah L. McGuinness

   http://protege.stanford.edu/publications/ontology_development/ontology101-noy-mcguinness.html

I don't know of anything that discusses ontology design with specific
reference to topic maps (apart from internal course material here at
Ontopia), but the principles are pretty simple. If you've read "The TAO
of Topic Maps" [1] you know that the core concepts in topic maps are
Topics, Associations, and Occurrences (hence "TAO"). Each of these can
be classified by type (topic types, association types, occurrence types)
- and types are themselves also topics...

Thus "Puccini" is a topic of type "composer", and "composer" is also
a topic. The association (relationship) between the topic "Puccini" and
the topic "Tosca" (which is of type "opera") is of type "composed by",
which is also a topic. An information resource containing the libretto
of Tosca would be an occurrence (of type "libretto") of the topic "Tosca".

In this example, the (typing) topics "composer", "opera", "composed by"
and "libretto" constitute the ontology -- or what some people term the
"upper ontology". The "lower ontology" consists of the individuals,
"Puccini", "Tosca" etc.

(Apologies for not being able to give you examples from your own domain:
The only "stars" I am familiar with are ones like Maria Callas and
Pavarotti :-)

It seems to me (correct me if I am wrong!) that what this initiative
needs is

(1) agreement, as far as possible, on a common upper ontology and how
     to *identify* the classes it consists of
(2) agreement on how to identify a useful common subset of known
     individuals, but without (necessarily) assigning those individuals
     to classes (since this might be controversial).

As soon as you have that, everyone can start making their own
assertions about any of the subjects in question in such a way that
knowledge about them can be aggregated, shared and reused.

I would advise you to apply the KISS principle. You will experience an
almost irresistible temptation to bite off more than you can chew, to
"overmodel", to get embroiled in endless discussions about almost
unresolvable details. Resist that temptation! Agree on the minimal
common subset that is actually useful and extend it later as necessary.
In particular, don't bother at this stage to try and express complex
constraints on the classes you identify for the upper ontology.

Finally, I would advise you to look seriously at the Published Subject
initiatives taking place under the auspices of OASIS:

    http://www.oasis-open.org/committees/tm-pubsubj/

You will achieve a lot in a short time if you concentrate on defining
published subjects for your upper and lower ontologies. Among other
things, it will make the choice of knowledge representation formalism
less important, since published subjects allow multiple formalisms to
interoperate. If anyone is interested in pursuing such a course, say
so (in a new thread) and Bernard Vatant and I can explain how to go
about it.

I wish you luck in your endeavours and will continue to lurk here in
case I can be of use.

Steve

[1] http://www.ontopia.net/topicmaps/materials/tao.html

--
Steve Pepper, Chief Executive Officer <pepper@ontopia.net>
Convenor, ISO/IEC JTC1/SC34/WG3  Editor, XTM (XML Topic Maps)
Ontopia AS, Waldemar Thranes gt. 98, N-0175 Oslo, Norway.
http://www.ontopia.net/ phone: +47-23233080 GSM: +47-90827246

From - Wed Oct  2 13:41:27 2002
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>>>>> "Carole" == Carole Goble <carole@cs.man.ac.uk> writes:

  Carole> Semantic distance in ontologies is a hot topic. It differs
  Carole> between ontologies that have asserted structure and those
  Carole> that have inferred (like OWL).

  Carole> I'm copying this message to two people to follow up (I'm ni
  Carole> a workshop right now :-) )

  Carole> a. Phil Lord who ahs developed semantic closeness measyres
  Carole>    for the Gene
  Carole> Ontology and has two papers on it

  Carole> b. Sean Bechhofer who has done work on how to do semantic
  Carole>    closeness in
  Carole> inferred taxonomies and aslo has a paper on it.

  Carole> Guys -- please point to thes epapers



I've put draft copies of the papers onto my website (see .sig). There
are also several talks, and a poster on the same topic, which all say
pretty much the same thing.

Cheers

Phil



-- 
Phillip Lord,				Phone: +44 (0) 161 275 6138
PostDoctoral Research Associate,        Email: p.lord@russet.org.uk
Department of Computer Science          http://www.russet.org.uk  
Kilburn Building                        http://www.cs.man.ac.uk/~phillord
University of Manchester                
Oxford Road
Manchester
M13 9PL

From - Wed Oct  2 11:58:07 2002
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Semantic distance in ontologies is a hot topic. It differs between
ontologies that have asserted structure and those that have inferred (like
OWL).

I'm copying this message to two people to follow up (I'm ni a workshop
right now :-) )

a. Phil Lord who ahs developed semantic closeness measyres for the Gene
Ontology and has two papers on it

b. Sean Bechhofer who has done work on how to do semantic closeness in
inferred taxonomies and aslo has a paper on it.

Guys -- please point to thes epapers

Carole




> It strikes me that, in order to have an ontology-based system make
> suggestions about a given topic (of the type: also look at topic X), we
> need a concept of 'distance' between classes.
>
> Would it be possible to add a 'closeness' factor to a
> relationship-type. This factor would have values (for simplicity) of
> [positive, neutral, negative]. Any two classes tied by that
> relationship-type would be 'close' if the closeness factor of the
> relationship-type was positive and 'far away' if negative; if the
> factor was neutral, then nothing could be said about their closeness.
>
> Subsumption relationships ('is a type of', 'is a component of') would
> most likely be positive, while antonymic relationships ('is distinct
> from') would be negative relationships. Neutral relationships might be
> ??? (can't think of one :).
>
> A class would then be closest to other classes with which it had the
> greater number of relationships with 'positive' closeness over those
> with 'negative' closeness (eg distance to the class could be computed
> by number of positive relationships minus number of negative
> relationships).
>
> Is this reasonable? Has 'distance' been defined already? Is it feasible
> (eg with OilEdit and DAML+OIL, say)?
>
> Cheers,
> Tony.
>
> __
> Tony Linde                       Phone:  +44 (0)116 223 1292
> AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
> Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
> University of Leicester          Email:  tol@star.le.ac.uk
> Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
>



From - Wed Oct  2 12:18:29 2002
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From: Sean Bechhofer <seanb@cs.man.ac.uk>
To: carole@cs.man.ac.uk
cc: tol@star.le.ac.uk, <semantics@us-vo.org>, <pwlord@cs.man.ac.uk>
Subject: Re: Ontological distance
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On Wed, 2 Oct 2002 carole@cs.man.ac.uk wrote:

>
> Semantic distance in ontologies is a hot topic. It differs between
> ontologies that have asserted structure and those that have inferred (like
> OWL).
>
> I'm copying this message to two people to follow up (I'm ni a workshop
> right now :-) )
>
> a. Phil Lord who ahs developed semantic closeness measyres for the Gene
> Ontology and has two papers on it
>
> b. Sean Bechhofer who has done work on how to do semantic closeness in
> inferred taxonomies and aslo has a paper on it.
>

This was discussed in:

@INPROCEEDINGS{bechhofer99:classification,
  AUTHOR = {Sean Bechhofer and Carole Goble},
  TITLE = {{Classification Based Navigation and Retrieval for Picture
Archives}},
  BOOKTITLE = {IFIP WG2.6 Conference on Data Semantics, DS8},
  YEAR = 1999,
  ADDRESS = {Rotorua, New Zealand},
  MONTH = {January}
}

http://potato.cs.man.ac.uk/papers/ds8.pdf

Cheers,

	Sean

-- 
Sean Bechhofer
seanb@cs.man.ac.uk
http://www.cs.man.ac.uk/~seanb


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From: "Bernard Vatant" <bernard.vatant@mondeca.com>
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References: <000301c269e9$d064f950$b524d28f@bunyip>
Subject: Topic Maps, Scope and Subject Identity  [RE: Taxonomy issues]
Date: Wed, 2 Oct 2002 10:58:00 +0200
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Honorable astro-semantic folks

I've been just notified today the existence of this forum by Steve Pepper, one of the
Topic Maps "gurus", who gently remembered that I had both the hat of topic maps "expert"
and the one of (life-long amateur) astronomer. As a matter of fact, I've had recently some
exchanges with Ashish Mahabal about Topic Maps in the VO project, and I'm happy to jump on
the occasion to bring more Topic Maps flavor in this semantic pot :))

About Taxonomy issues, I want to confirm that Topic Maps "scope" is exactly intended to
handle those situations of multiple views on a single object: multiple names, multiple
classifications, multiple interpretations ... as Ashish has pointed.

Another issue that can be tackled by scope is controversial or hypothetical object
identity, e.g., "Is IR-Source A the same "object" than X-Source B?"

What TM approach will do in such a case is defining each of those as a distinct "subject"
(of conversation), distinct from each other and of any "object" out there - a distinction
in fact very crucial to Astronomy! Each "subject" is represented as a specific topic, say
"IR_A" and "X_B".

Information about each of those subjects (classifications, observations, data,
interpretation, papers, ...) will be attached to the respective topics. If at some point
in time the two sources are somehow "proven" to be different "manifestations of the same
object", say "Quasar_Z", you can either:

-- Merge the three topics, but keep "IR_A" and "X_B" characteristics distinct through
scope mechanism.

-- Keep the topics classified as "sources" independent of the topic classified "object",
and link them through "object-manifestation" associations, asserting that, e.g.

In (the scope of) IR bandwidth observations, "Quasar_Z" is identified as "IR_A".

If you want to add the information that this identification is still controversial, it can
be added as a scope element too ...


Hope that helps

Bernard

-------------------------------------------------------------------
Bernard Vatant
www.universimmedia.com

Consultant - Mondeca
www.mondeca.com

Chair - OASIS TM PubSubj Technical Committee
www.oasis-open.org/committees/tm-pubsubj/
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From - Wed Oct  2 10:56:13 2002
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From: "Tony Linde" <tol@star.le.ac.uk>
To: <semantics@us-vo.org>
Subject: Ontological distance
Date: Wed, 2 Oct 2002 09:18:10 +0100
Organization: University of Leicester
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It strikes me that, in order to have an ontology-based system make
suggestions about a given topic (of the type: also look at topic X), we
need a concept of 'distance' between classes. 

Would it be possible to add a 'closeness' factor to a relationship-type.
This factor would have values (for simplicity) of [positive, neutral,
negative]. Any two classes tied by that relationship-type would be
'close' if the closeness factor of the relationship-type was positive
and 'far away' if negative; if the factor was neutral, then nothing
could be said about their closeness.

Subsumption relationships ('is a type of', 'is a component of') would
most likely be positive, while antonymic relationships ('is distinct
from') would be negative relationships. Neutral relationships might be
??? (can't think of one :).

A class would then be closest to other classes with which it had the
greater number of relationships with 'positive' closeness over those
with 'negative' closeness (eg distance to the class could be computed by
number of positive relationships minus number of negative
relationships).

Is this reasonable? Has 'distance' been defined already? Is it feasible
(eg with OilEdit and DAML+OIL, say)?

Cheers,
Tony. 

__
Tony Linde                       Phone:  +44 (0)116 223 1292
AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
University of Leicester          Email:  tol@star.le.ac.uk
Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
 

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From: "Tony Linde" <tol@star.le.ac.uk>
To: <semantics@us-vo.org>
Subject: Ontology for Dummies
Date: Wed, 2 Oct 2002 09:00:46 +0100
Organization: University of Leicester
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I know, there isn't such a book, so what can we (the non-experts) have
to get us up to speed. Can we come up with suggested texts that would
take a non-expert from basics through to understanding why and how to
encode a subject domain ontology and why and how to use it in one or
more applications.

Can people suggest books and web sites (tutorial oriented) in the
following categories (or others if I'm off beam):

Overview of ontologies
Introduction to DL
Aspects of DL applicable to ontologies
Basics of any ontology language
Coding an ontology in {DAML+OIL, OWL, etc.}
Specific applications of ontological approach to problem solving

I've found the following site:
http://www.cs.man.ac.uk/~franconi/dl/course/
Would any of these books be useful in the above sections? If so, which?

Cheers,
Tony. 

__
Tony Linde                       Phone:  +44 (0)116 223 1292
AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
University of Leicester          Email:  tol@star.le.ac.uk
Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
 

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From: "Roy Williams" <roy@cacr.caltech.edu>
To: <semantics@us-vo.org>, "Reagan Moore" <moore@sdsc.edu>,
   "Amarnath Gupta" <gupta@sdsc.edu>
References: <FJEBJKODDEKKLPPCMHFJIEDDCEAA.szalay@jhu.edu> <015401c26705$5f491e40$6401a8c0@cacr.caltech.edu> <v04210106b9bbffe1d4b7@[132.249.200.198]>
Subject: Re: UMLS (Unified Medical Language System)
Date: Mon, 30 Sep 2002 10:44:51 -0700
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> Amarnath Gupta at SDSC has implemented the UMLS ontology ....
> We have used the ontology for tasks such as:
> - parse a report to identify relevant words
> - use the UMLS ontology to identify a broader context that includes
> the identified words
> - access the medpub collection to retrieve similar reports on the same
subject.

Reagan and Amarnath

This sounds like an interesting application of an ontology. I have been
thinking of a similar type of project, taking a paper about astronomy,
finding all the references to galaxies and stars (eg NCG 666), and adding
the relevant citations to NED and Simbad.

A couple of questions:

-- When you parse a report for relevant words, did you start with text, or
pdf, or Word, or Latex, or what?

-- Did the parsing involve a Natural Language parser, or was it a tokenizing
on whitespace?

-- The UMLS has a lot of structure besides a simple set of words. Were any
parts of this structure used?

Roy

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Subject: RE: Taxonomy issues
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A small comment about conflicting definitions:
this is closely related, I feel, to the 'specific vs generic'
UCD issue: we have the general concept of a V magnitude, and
the specific concept of a Johnson V or someone else's V filter.
Sometimes we want to ask a loose question about V mags and 
sometimes we want to be precise.
In the same way, in astronomical practice we sometimes loosely
refer to BL Lac objects (or red fairies, or...) and sometimes
precisely refer to BL Lac objects (by Weedman's 1978 criterion)
or to red fairies (by Richards(2002) velocity criterion). I think
our ontology can define many different flavors of precisely defined
red fairy, tagged by the reference which defines them, as subclasses
of a more broadly defined concept of red fairy. Then we can ask:
is Mu Draconis a red fairy by anyone's definition (is it in the union
of all red fairy definitions), and we can also ask: is Mu Draconis
a Richards(2002) red fairy? Or, more exactly, has someone claimed
that it is a red fairy... and as Tony pointed out, different authors
may have classified it in conflicting ways, and the data they used
may have uncertainties on it or be wrong, but our cloud of red-fairy-related
concepts is still precise. 
 It's when organizing our theory-laden classes in a relational
tree that we'll have to be very careful, and I do think we will
need to support alternate ontologies. Is an SGR (soft gamma repeater)
a nearby neutron star or an object in a distant galaxy? Even when
the question is 99.999 percent decided: is a quasar an active
galactic nucleus (and therefore is a subclass of 'objects contained in
a galaxy') or is it a nearby thing ejected from a galaxy? When Chip
Arp uses the VO, he should be able to impose his redshifts-aren't-cosmological
ontology even though we all know he's wrong. I don't think that fear
should stop us from developing one or a few default ontologies
to represent our model of the universe, although perhaps it would
be dangerous for the IVOA to officially bless one. Gotta have them, though 0
- it's the only way we will be able to go beyond what SIMBAD et al do
and search for the component of the binary star inside a globular
cluster that we are interested in, a situation in which positional
matching is not going to work.
 OK, this wasn't a small comment after all. Sorry!
   - Jonathan McDowell

 .-------------------------------------------------------------------.
 |  Jonathan McDowell            |  phone : (617) 495-7176           |
 |  Harvard-Smithsonian Center   |  fax   : (617) 495-7356           |
 |   for Astrophysics            |                                   |
 |  60 Garden St, MS6            |                                   |
 |  Cambridge MA 02138           | email : jcm@cfa.harvard.edu       |
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From - Sun Sep 29 14:20:04 2002
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From: "Tony Linde" <tol@star.le.ac.uk>
To: <semantics@us-vo.org>
Cc: "'seanb'" <seanb@cs.man.ac.uk>
Subject: RE: Taxonomy issues
Date: Sun, 29 Sep 2002 13:05:12 +0100
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This is a very illuminating discussion. Thanks especially to Sean for
his lucid differentiation between an ontology of classes and instances
of those classes.

It seems that the bottom line is that we should try to get our
'concepts' organised into some logical non-conflicting coherence but
there's no problem with different people classifying individuals as
instances of different classes.

So, our ontology will state that a star cannot be the same as a galaxy
but entity X may be classified by author A as a star and by author B as
a galaxy. And all of this is consistent even though the inference engine
will tell us that there is a conflict between the authors' statements.

**Questions to Sean: does an inference engine work on instances or just
on the classes? Can we store the ontology in OWL format and the
classification of instances in a rdbms (while the instance data may be
stored in FITS files or whatever) and still make inferences?

The more serious issue is that raised by Anita: 'whether a red fairy is
a variable star with a period of <400 days or <350 days and a green
fairy has a period of >400 or >350 days'. The astronomy community, or
that part of it constructing an ontology plugged into a given VO, needs
to decide whether to plump for one or the other definition or allow both
and if the latter, how.

Looking at George's email, his classification of classifications was
illuminating. What I think he is looking for in any 'use' of an ontology
is being able to get at the provenance of any instantiations. So if
entity X is classified by author A as a star, then we need to provide a
record of how that classification was arrived at.

This provenance should include the original source data and any
selections, transformations and analyses which were performed on the
data. This has a couple of implications.

1. We need some way of organising or describing an author's set of
instantiations and their provenance. Namespaces could be one way but,
given that we'll have tens or hundereds of '000s of these, it could get
a little cumbersome. Somehow, an astronomer needs to be able to say: 'I
accept the sets described by authors A, D and M. Please check my own
work against theirs'.

2. We need a language (and ontology) for describing workflows and their
component activities. There has been work in the commercial world on
this, partly subsumed by the term 'organizational memory', which I know
Carole and the Geodise project is working on.

This is partly what I was getting at in my previous email about
'ontology-based querying'. Is there some higher order of classification
for selection criteria (apart from their UCD-operation-Value graph) that
will allow deduction of criteria from the description of a desired set
of results?

The final issue is that of outliers or anomalies. We have to make sure
they aren't shoehorned by the software into inappropriate categories and
also that they can be identified as the target for future research. I'm
not sure whether what has been said protects them or not, highlights
them or not. I don't think they need separate handling but need to be
accounted for in any scheme or approach.

Cheers,
Tony. 
__
Tony Linde                       Phone:  +44 (0)116 223 1292
AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
University of Leicester          Email:  tol@star.le.ac.uk
Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
 

From - Wed Oct  2 10:56:02 2002
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 <015401c26705$5f491e40$6401a8c0@cacr.caltech.edu>
Date: Sat, 28 Sep 2002 17:59:23 -0700
To: <semantics@us-vo.org>, "Roy Williams" <roy@cacr.caltech.edu>
From: Reagan Moore <moore@sdsc.edu>
Subject: Re: UMLS (Unified Medical Language System)
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Roy:
Amarnath Gupta at SDSC has implemented the UMLS ontology in an Oracle 
database.  This is a collection of roughly 2 million terms and some 7 
million relationships.

The goal of the implementation was to understand scalability 
mechanisms for manipulating large ontologies, understand how to map 
the annotated relationships to logical rules, and understand how to 
apply the logical rules to query across collections with disparate 
semantic labels and attributes.

We have used the ontology for tasks such as:

- parse a report to identify relevant words
- use the UMLS ontology to identify a broader context that includes 
the identified words
- access the medpub collection to retrieve similar reports on the same subject.

Reagan


>I saw a link to this in my email this morning, the Unified Medical
>Language System (*), a compendium of different vocabularies about
>medicine. It is sorted and classified in different ways, and has
>licenced software to go with it.
>
>"The Metathesaurus preserves the meanings, attributes, hierarchical
>connections, and other relationships between terms present in its source
>vocabularies, while adding certain basic information about each of its
>concepts and establishing synonymy and new relationships between
>concepts and terms from different source vocabularies.
>
>METATHESAURUS SIZE: 113,699,627 BYTES.
>CONCEPT UNIQUE IDENTIFIERS (CUIs): 729,248
>SYNONYMS: 1,598,176
>
>I wonder if this is something we could develop as a VO resource? There
>are varous candidate vocabularies that we could uses as a basis listed
>below(**).
>
>It looks like NIH have spent a lot of resouces on UMLS, and I wonder
>exactly how people use it, and more importantly for us, how such a thing
>might help the VO community?
>
>Roy Williams
>---------
>Caltech Center for Advanced Computing Research
>mail    roy@cacr.caltech.edu
>voice   +1 626 395 3670
>
>
>-----------------------------------------------
>(*) The UMLS system is explained here:
>http://www.nlm.nih.gov/research/umls/META2.HTML
>
>This is a list of all the vocaularies that UMLS has subsumed
>http://www.nlm.nih.gov/research/umls/METAA1.HTML
>
>This is a list of "semantic types"
>http://umlsinfo.nlm.nih.gov/styfile.html
>
>-------------------------
>(**) Some Astronomy Vocabularies
>UCD vocabulary
>http://vizier.u-strasbg.fr/doc/UCD.htx
>
>Astronomy Thesaurus
>http://msowww.anu.edu.au/library/thesaurus/
>
>American Institute of Physics
>http://www.aip.org/pacs/pacs01/pacs0190.htm

From - Tue Sep 24 14:43:38 2002
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Bertram wrote in his discussion:

> If you need real *reasoning* capabilities, i.e., given a definition of

> a concept A and another definition of a concept B, does one contain or

> exclude the other (or are they equivalent), then you need to look at
> "Description Logics". Probably you do not need this functionality, but

> I just mention it for completeness.

I find this extremely strange as a comment.   Bertram suggests that
there are the "before semantic web" and "after the semantic web"
languages. This is not true.  OWL (see point (b)) is heavily influenced
by Frame-logic work by Karlesruhe. RuleML (see (c) ) is linking Datalog
and Horn Logic with DAML+OIL.  To be so dismissive doesn't do you
justice Bertram!!

(a) The classification based reasoning that DLs give you is EXACTLY the
kind required to build controlled vocabularies. Controlled vocabularies
for content will be the primary use of ontologies in this field I
suspect as they are in biology.  we are using DAML+OIL to rebuild the
Gene Ontology, and I cantell you we aren't doing it for our health. We
are doing it because "we DO need this kind of functionality" to build
large, multi-axial, coordinated and multi-authored ontologies.
Subsumption based reasoning, and its associated query inclusion and
indexing is highly valuable, not to mention the axioms for ensuring
concept satisfaction. I'll put a couple of papers about our experiences
on this on a web site -- they are in press so I have to seek permission
to do so. We have also used these approach in myGrid for describing and
matching services (http://mygrid.man.ac.uk/rpapers.shtml), as have HP
(see http://www2002.org/CDROM/refereed/211/index.html)
All of this is reasoning with *intension*.

If you are arguing about inference over instances with variable, then
that is another argument.  *extensional* reasoning is better served by
conventional database languages and even deductive databases,

For controlled vocabularies Deductive Databases seem like an overkill --
this goes back to your point about "what do you want to do with your
representation".  In fact, DD for ontological reasoning is probably
missing the point.

b) DAML+OIL and OWL (the language that has derived from DAML+OIL,
proposed by W3C WebOnt and now released in draft form) does have the
benefit of a community of tool builders producing parsers, editors,
matching engines, viewers, annotators etc etc.  This should not be
underestimated.  It also gives you a range of reasoning engines, if you
want that sort of thing, or just a common exchange language if you want
that sort of thing too.
I recommend that you take a look at the OWL spec:
http://www.w3.org/2001/sw/WebOnt/
By the way, OWL-Lite is (I believe) supportable by F-Logic reasoners as
well as conventional DL reasoners.

c) The use of Datalog style reasoning with deductive rules is useful, of
course, in particular if one wants to do process modelling and planning
& scheduling  work. Attempts are being made in the Semantic Web world to
incorporate DAML+OIL terms in rule languages. An interesting place to
look at is RuleML  activity:
http://www.dfki.uni-kl.de/ruleml/         I haven't used FLORID in a
long time but I do remember problems with robustness and legacy data,
and wasn't it undecidable as well as intractable?  Tractability is only
obtainable in DD by the Closed World Assumption.  Again, CWA can be
presumed over querying instances, but reasoning about possibilities, as
one would want to to do ontological intensional reasoning, is best
served by the open world assumption.

d) RDF, though a simple graph model, is weak but it is promising for
data integration and does have some reasoning capabilities. The point of
RDF as a graph model is really to support data aggregration through
graph matching --  in the way that TAP does for example
(http://tap.stanford.edu/). You shouldn't lose sight of the fact that
the Semantic Web movement if actually about DATA INTEGRATION and not
about AI at all. This sometimes gets forgotten :-)

e) One of the import things you should not lose sight of is the
"semantic continuum" (trademark Mike Uschold). By this I mean that some
of your ontologies will be no more that simple hierarchies, and some
will need subsumption reasoning. And some will want other forms of
reasoning that take them out of the decidability camp.  Moreover, you
will want to slide along this continuum --starting simple and then
selectively elaborating. Or even going the other way and selectively
simplifying. Have a language that allows you to say as little or as much
as you want in the same framework, and provides reasoning support for
evolution, is darn handy. That is why we use DAML+OIL.

f) Finally -- take care about ontology development vs ontology
deployment. You could use all sort of fancy stuff in design (and I would
argue that it is needed - see (a) ) but then generate a simple
representation for deployment -- say in RDF, or even Topic Maps.  You
cannot assume in the Grid or the Web that your deductive database or
your reasoning engine is available, but you still want to get something
out of your metadata.

Conclusion -- there is no one technology, we need a basket of
technologies working in consort that do the best job for what you need.

Carole


From - Tue Sep 24 17:49:53 2002
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>>>>> "CG" == Carole Goble <carole@cs.man.ac.uk> writes:
CG> 
CG> Bertram wrote in his discussion:
CG> 
>> If you need real *reasoning* capabilities, i.e., given a definition of
CG> 
>> a concept A and another definition of a concept B, does one contain or
CG> 
>> exclude the other (or are they equivalent), then you need to look at
>> "Description Logics". Probably you do not need this functionality, but
CG> 
>> I just mention it for completeness.
CG> 
CG> I find this extremely strange as a comment.   Bertram suggests that
CG> there are the "before semantic web" and "after the semantic web"
CG> languages. This is not true.  OWL (see point (b)) is heavily influenced
CG> by Frame-logic work by Karlesruhe. RuleML (see (c) ) is linking Datalog
CG> and Horn Logic with DAML+OIL.  To be so dismissive doesn't do you
CG> justice Bertram!!

Hi Carole!

Oops.. didn't want to imply that there are before and after the
semantic web languages! (in fact, I tried to locate in which context I 
said the above -- but sure: these are my words ;-)

What I tried to say above is that for the application at hand, it may
or may not be necessary to have *real* reasoning capabilities a la
Description Logics. Often time (at least in applications we have
encountered), a "simpler" reasoning a la Datalog is good enough:
Essentially formula evaluation over a given database
instance. However, sometimes you need the reasoning machinery because
you want to know whether some concept definition implies another, or
is consistent with another etc. Another quite hot application of
reasoning is of course in semantic query optimization.

Another comment I made at some point and that may (but hopefully
doesn't) upset the community is that there are several formalisms out
there that co-exist but it is not clear which one will have the
greatest impact. For example RDF, RDFS vs DAML+OIL.  In some sense
they are complementary, but in another they are competing.

Don't get me wrong: I'm a friend of the Semantic Web! However, in our
data mediation projects, we are still wrestling with some query
processing issues, that's why we have still a few months to go before
we look very closely at the state of the Semantic Web then. (In the
XML querying world we made the same experience that things are in a
flux for a while)

CG> (a) The classification based reasoning that DLs give you is EXACTLY the
CG> kind required to build controlled vocabularies. Controlled vocabularies
CG> for content will be the primary use of ontologies in this field I
CG> suspect as they are in biology.  we are using DAML+OIL to rebuild the

I agree.

CG> Gene Ontology, and I cantell you we aren't doing it for our health. We
CG> are doing it because "we DO need this kind of functionality" to build
CG> large, multi-axial, coordinated and multi-authored ontologies.
CG> Subsumption based reasoning, and its associated query inclusion and
CG> indexing is highly valuable, not to mention the axioms for ensuring
CG> concept satisfaction. I'll put a couple of papers about our experiences
CG> on this on a web site -- they are in press so I have to seek permission
CG> to do so. We have also used these approach in myGrid for describing and
CG> matching services (http://mygrid.man.ac.uk/rpapers.shtml), as have HP
CG> (see http://www2002.org/CDROM/refereed/211/index.html)
CG> All of this is reasoning with *intension*.

Understood.

CG> If you are arguing about inference over instances with variable, then
CG> that is another argument.  *extensional* reasoning is better served by
CG> conventional database languages and even deductive databases,

yes. and again: my comment wasn't meant to dismiss inference at all
(in fact, I'm an old time inference guy myself having worked with
deduction systems and tableaux reasoners of various sorts). 
For example in our ICDE'01 paper I explicitly suggested the use of
description logic to register new concepts relative to an existing
ontology. However, not always does one need reasoning. But I agree,
multi-authored ontologies is a clear case *for* reasoning!

CG> For controlled vocabularies Deductive Databases seem like an overkill --
CG> this goes back to your point about "what do you want to do with your
CG> representation".  In fact, DD for ontological reasoning is probably
CG> missing the point.

I agree that DD would be not appropriate for reasoning with controlled 
vocabularies. But not because they are too powerful, but because they
are too weak.

CG> b) DAML+OIL and OWL (the language that has derived from DAML+OIL,
CG> proposed by W3C WebOnt and now released in draft form) does have the
CG> benefit of a community of tool builders producing parsers, editors,
CG> matching engines, viewers, annotators etc etc.  This should not be
CG> underestimated.  It also gives you a range of reasoning engines, if you
CG> want that sort of thing, or just a common exchange language if you want
CG> that sort of thing too.
CG> I recommend that you take a look at the OWL spec:
CG> http://www.w3.org/2001/sw/WebOnt/
CG> By the way, OWL-Lite is (I believe) supportable by F-Logic reasoners as
CG> well as conventional DL reasoners.

very good -- I haven't stopped by there recently...


CG> c) The use of Datalog style reasoning with deductive rules is useful, of
CG> course, in particular if one wants to do process modelling and planning
CG> & scheduling  work. Attempts are being made in the Semantic Web world to
CG> incorporate DAML+OIL terms in rule languages. An interesting place to
CG> look at is RuleML  activity:
CG> http://www.dfki.uni-kl.de/ruleml/         I haven't used FLORID in a
CG> long time but I do remember problems with robustness and legacy data,
CG> and wasn't it undecidable as well as intractable?  Tractability is only
CG> obtainable in DD by the Closed World Assumption.  Again, CWA can be
CG> presumed over querying instances, but reasoning about possibilities, as
CG> one would want to to do ontological intensional reasoning, is best
CG> served by the open world assumption.


Indeed F-logic (the FLORID and the FLORA implementations e.g.) like
Prolog is Turing complete. However there are decidable fragements. But
then again, one (well, at least we) don't use it for reasoning but for
"formula evaluation" over a given instance. Of course using function
symbols you can reduce reasoning to a query evaluation problem (see
the paper by David Toman in last year's DL workshop).  For specialized
reasoning tasks, in particular with description logics, there is no
doubt that specialized reasoning engines are the way to go and that
they clearly outperform other approaches. A perfect example is FACT!


CG> d) RDF, though a simple graph model, is weak but it is promising for
CG> data integration and does have some reasoning capabilities. The point of
CG> RDF as a graph model is really to support data aggregration through
CG> graph matching --  in the way that TAP does for example
CG> (http://tap.stanford.edu/). You shouldn't lose sight of the fact that
CG> the Semantic Web movement if actually about DATA INTEGRATION and not
CG> about AI at all. This sometimes gets forgotten :-)

that's true. I sometime try to "de-worry" people about the complexity
of some languages and then make some (only slightly) simplifying
statements such as "RDF is just labeled graphs or triples -- done". 
Please forgive =B-)

CG> e) One of the import things you should not lose sight of is the
CG> "semantic continuum" (trademark Mike Uschold). By this I mean that some
CG> of your ontologies will be no more that simple hierarchies, and some
CG> will need subsumption reasoning. And some will want other forms of
CG> reasoning that take them out of the decidability camp.  Moreover, you
CG> will want to slide along this continuum --starting simple and then
CG> selectively elaborating. Or even going the other way and selectively
CG> simplifying. Have a language that allows you to say as little or as much
CG> as you want in the same framework, and provides reasoning support for
CG> evolution, is darn handy. That is why we use DAML+OIL.
CG> 
CG> f) Finally -- take care about ontology development vs ontology
CG> deployment. You could use all sort of fancy stuff in design (and I would
CG> argue that it is needed - see (a) ) but then generate a simple
CG> representation for deployment -- say in RDF, or even Topic Maps.  You
CG> cannot assume in the Grid or the Web that your deductive database or
CG> your reasoning engine is available, but you still want to get something
CG> out of your metadata.
CG> 
CG> Conclusion -- there is no one technology, we need a basket of
CG> technologies working in consort that do the best job for what you need.

I couldn't agree more -- and I hope that if you take the conjunction
of my statements that you can derive "false" (i.e., derive an
inconsistency ;-)

Bertram

CG> 
CG> Carole
CG> 

From - Sun Oct 20 19:22:30 2002
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-------- Original Message --------
Subject: SMORE - Semantic Markup, Ontology, and RDF Editor (version 
2.0b) available
Date: Wed, 9 Oct 2002 21:05:45 -0700 (PDT)
From: Aditya Kalyanpur <swap_adityak@yahoo.com>
Reply-To: Aditya Kalyanpur <swap_adityak@yahoo.com>
To: gswsg@listserv.gsfc.nasa.gov, www-rdf-interest@w3.org



Hi,
  SMORE - Semantic Markup, Ontology, and RDF Editor
version 2.0b is now available for download. The aim of
this tool is to allow users to markup their documents
in RDF/XML using web ontologies in association
with user-defined terms and elements. For a brief
introduction and download link, please check the
following url:

http://www.mindswap.org/~aditkal/editor.shtml

  Feel free to try the beta version and let me know
your thoughts on it.  

Thanks,
Aditya.

MIND SWAP Research Group (http://www.mindswap.org)
University of Maryland, College Park

__________________________________________________
Do you Yahoo!?
Faith Hill - Exclusive Performances, Videos & More
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From - Sun Oct 20 19:22:34 2002
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From: "Tony Linde" <ael@star.le.ac.uk>
To: <semantics@us-vo.org>
Subject: RE: UCDs, metadata and AstroOntology
Date: Thu, 17 Oct 2002 11:20:19 +0100
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> -----Original Message-----
> From: owner-semantics@us-vo.org 
> [mailto:owner-semantics@us-vo.org] On Behalf Of Anita Richards
> Sent: 16 October 2002 14:38
...
> In practice, catalogues might contain any information 
> anywhere...

I guess this relates to 'annotation' - the process of adding metadata to
articles, data tables etc. A big job but one that CDS does now and which
the bioinformaticians have obviously developed various bits of software
to help with.

> ... As I understand it, the UCDs _are_ the meta data 
> for each column but they are dynamic, ie built up out of 
> atoms from the column or the header or possibly higher levels 
> depending on the query.

I'm not sure I understand what you mean by them being dynamic. Once a
UCD is assigned to a column, it is fixed, n'est-ce pas?

> -----Original Message-----
> From: Guy Rixon [mailto:gtr@ast.cam.ac.uk] 
> Sent: 16 October 2002 15:48
...
> ... For me, UCDs ARE 
> metadata but ARE NOT names.

I think I'm getting the message now :)

And I guess I should have realised that from the name: unified column
DESCRIPTORS.

> I propose that a programme reading, say, a VOTable should be 
> able to find and use columns of that table for which it knows 
> the semantics independently of some ontological service.  

Which is basically saying that all or some of the metadata should be
embedded in the VOTable, so any piece of data should carry its metadata
around with it. I have no argument with that, though I guess in some
cases it'll be better not to (cannot think of an example offhand).

> 1. To make the parsing self-contained.  Collating bits of 
> metadata from many parts of a document makes a programme complicated.

I don't think I agree with that. To me, parsing is always more difficult
than looking in a specific place for a specific piece of data. If
metadata is carried in a specific place in the VOTable, it'll be
relatively easy for a program to look for it there and use it.

As you said above, UCDs are metadata, not column names, so why not use
the column names as the column names and store the metadata separately
in a form that makes it easy to access and use.

> -----Original Message-----
> From: Ray Plante [mailto:rplante@poplar.ncsa.uiuc.edu] 
> Sent: 16 October 2002 16:05
...
> Last week, a number of us attended a workshop at SAO on 
> developing data models for the VO...

Do you have a write-up on any papers presented or outcomes of the
meeting?

> As many of you know, I'm partial to a data-model-based metadata 
> definition;

I'm not sure what you mean by 'data-model-based metadata', Ray? Can you
explain this more or point to any papers you've written that expalin it?
Thanks.

Cheers,
Tony. 
__
Tony Linde                       Phone:  +44 (0)116 223 1292
AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
University of Leicester          Email:  ael@star.le.ac.uk
Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
 

From - Mon Oct 21 10:06:45 2002
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From: Sean Bechhofer <seanb@cs.man.ac.uk>
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I think I tried to post this a while back, but it didn't seem to come
through....

On Sun, 6 Oct 2002, Alan Rector wrote:

> Tony - Dan, Libby and Greg
>
> Thanks to Tony for bringing the paper to our attention.
>
> A question for the authors...
>
> Most of the issues concern namespaces and equivalence which I
> shall leave to Sean.

> Towards the end of the paper you have an almost throw away comment
> that
>
>     "Another significant problem was the awkward syntax and limited
> expressivity..."
>
> Leaving aside the awkward syntax, I would be curious to know specific
> examples of the  problems with expressivity in your concrete
> task.  The reference to Pat Hayes isn't helpful because I know
> his theoretical position.  The question is, "What happens in practice?"

I too (as an implementor) have struggled with the issue of awkward syntax.
Collaping the richer models down into the RDF triple model makes things
hard (from an implementation point of view) and produces effectively
unreadable syntax (from a user point of view). However, that shouldn't
necessarily be a problem -- rather it's a requirement for good end-user
tools. RDF shouldn't be seen as a human readable syntax, but as a
mechanism for exchange between machines.

As with Alan, I'd be interested in knowing where the expressivity is
insufficient.

In the concluding section, there's a comment:

"Where DAML+oil is used to describe relations between objects in
ontologies written by different authors, connecting the ontologies
involves hypothesising what the author meant by the ontology. A machine
readable DAML+oil ontology does not capture all the aspects of the world
in the area which it claims to represent, and so there is immense
potential for error, still more so when the ontologies are defined in RDF
Schema or Mime directories or other means less precise than DAML+oil."

This is a good point, and one that's present regardless of the
representation used. One of our hypotheses is that the explicit modelling
capabilities of richer languages will help to alleviate the problems of
interpreting the author's original intent.

"Even within a single ontology, the degree of precision that DAML+oil
enables you to describe between objects is in many cases greater than the
degree of precision that you know pertains in those particular
circumstances. This means that arbitrary decisions are made for those
descriptions, leading to errors of interpretation, and, paradoxically, a
reduction in precision, because of the introduction of this random noise."

Again, are there examples of this? The use of a rich language does not
mandate that one has to use all the functionality. We could quite easily
define simple taxonomies (or even a completely flat vocabulary) using D+O.
Indeed, one of our approaches to building models is to do precisely this
-- start out with a simple taxonomic structure and then incrementally
refine this through definition.

Greg later wrote:

>I am sure all these problems are old hat for others and I am surely the
>least qualified to criticize DAML+OIL. After the fact I would say that
>SkiCal just wasn't "hierarchal" enough to make sense in DAML+OIL and I am
>not quite sure what would be, but Alan has asked for a response, maybe we
>can talk a bit about this on Wednesday and I can brush up on the work and
>be more concrete, otherwise I realize that this too is an "argument with
>out evidence".

Looking briefly at the iCal format, it does look to be lacking many
intensionally defined classes, which is the sort of area that D+O is good
at tackling. iCal seems rather to give a kind of top level schema for the
sort of information that you might want to store about events. I think
that where this kind of scenario would benefit is in the modelling of the
vocabulary that is then used to populate that schema. For example, the
kinds of person that may be involved in an event, or the different kinds
of venue where an event may be held.

Cheers,

	Sean

-- 
Sean Bechhofer
seanb@cs.man.ac.uk
http://www.cs.man.ac.uk/~seanb



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From: "Tony Linde" <tol@star.le.ac.uk>
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Subject: UCL2DAML
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>From http://freshmeat.net/projects/ju2d/?topic_id=97%2C135:

'The Uml2Daml Converter is a GUI application for automated
transformation of UML 1.4 class-diagramms (in XMI 1.1) into DAML+OIL
ontologies. It is also possible to visualise the ontologies as directed
graphs. Since transformations are based on the XMI 1.1 standard,
DAML+OIL ontoligies can be modelled by using any UML tool which is able
to produce XMI 1.1/UML 1.4 compilant exports (such as TogetherJ 6.0).'

Home page is at:
 
http://www.jdev.de/html/en/projects/uml2daml/index.html?select=menu1&ite
m=menu1_3
and download at:
  http://www.jdev.de/files/downloads/jdev-u2d-0.1.tar.gz

I've not managed to get it to work under windows so far.

Cheers,
Tony. 

__
Tony Linde                       Phone:  +44 (0)116 223 1292
AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
University of Leicester          Email:  tol@star.le.ac.uk
Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
 

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From: "Tony Linde" <ael@star.le.ac.uk>
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Subject: Fwd: astronomy ontology... from Ottawa?
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An interesting starting point for an AstroOntology...

On Wed, 5 Feb 2003 14:30:19 +0000 (GMT), "Elizabeth Auden"
<eca@mssl.ucl.ac.uk> said:
> Hi,
> 
> While looking for a definition of white dwarf stars, I just stumbled
> blindly across a very good candidate for an astronomy ontology (complete
> with elements and relationships):
> 
> 
> http://www.site.uottawa.ca:4321/astronomy/index.html
> 
> 
> 
> The page with white dwarf info, for example, is
> 
> http://www.site.uottawa.ca:4321/astronomy/index.html/#whitedwarf
> 
> 
> cheers,
> Elizabeth
> 
> 
> 
> 
__
Tony Linde                       Phone:  +44 (0)116 223 1292
AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
University of Leicester          Email:  ael@star.le.ac.uk
Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org

-- 
http://fastmail.fm - Choose from over 50 domains or use your own

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Hello,

I would like to start the SMORE Browser,
where do I enter my proxy-settings.

> Kind regards
> _________________________________________________
> 
> Mathias Frömmer
> Ingenieur-Assistent (BA)
> 
> 
> GFT Technologies AG
> 
> Curiestraße 5
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---------- Forwarded message ----------
Date: Fri, 21 Feb 2003 13:52:04 -0600
From: Mike Wilde <wilde@mcs.anl.gov>
To: all@griphyn.org
Subject: WWW 2003 Workshop on E-Services and the Semantic Web


CALL FOR PAPERS

WWW 2003 Workshop on E-Services and the Semantic Web
Budapest, Hungary
Tuesday, May 20, 2003

Workshop Co-Chairs:
Fabio Casati (Hewlett-Packard Labs, Palo Alto, USA), E-mail: 
fabio_casati@hp.com
Dimitris Plexousakis (ICS-FORTH and University of Crete, Greece) E-mail: 
dp@ics.forth.gr

Workshop web page: http://www.ics.forth.gr/isl/essw2003/


Theme of the Workshop
---------------------

Two important trends are emerging in the World Wide Web.  The first is
the proliferation of electronic services (e-services) and in particular
of Web services.  The second is the emergence of the so-called
"Semantic Web".  The confluence of these trends forms the basis for
this workshop. The application of Semantic Web technologies to
e-services requires the specification of service capabilities and
behaviors. Such descriptions will enable the automation of a variety of
tasks, including e-service discovery, invocation, composition and
interoperation.

The upcoming technology of electronic services enables the development and 
deployment of loosely coupled, interoperable, distributed, heterogeneous 
systems.
These will help establish relationships amongst service providers, 
customers and intermediaries more rapidly and with reduced setup time and 
cost. The industry has provided the initial building blocks for programmatic
access to e-services, through standards such as UDDI, WSDL, ebXML, BPEL
and SOAP, and through e-service platforms such as WebLogic, .Net and
WebSphere.  Nevertheless, many issues remain largely unresolved. In
particular, many of the initial goals of the early e-service and
Semantic Web visionaries, such as dynamic discovery, binding, and
composition of e-services as well as their secure and reliable
execution, are yet to be reached.
The resolution of these issues, possibly through the provision of
machine-interpretable e-service descriptions through the emergence of
the Semantic Web, could enable fundamentally new approaches to finding,
assembling, executing, and monitoring e-services.

Workshop Topics and Objectives
-----------------------------

The "E-Services and the Semantic Web" workshop will
provide a forum for presentation and discussion of theoretical
foundations, computational techniques, and emerging systems
technologies for e-service description, discovery, and composition.
This will include investigation of e-services issues in:
- the application of the Semantic Web paradigm to e-services
- workflow and distributed systems (e.g., process models for
e-services, transactional properties, security, optimization)
- AI (e.g., knowledge representation and reasoning, ontologies,
planning, and verification)
- databases (e.g., metadata, data management)
The workshop will also address principled applications of these
technologies in areas such as e-commerce, e-business, health care,
scientific computing, education, and e-government.

The following is a non-exhaustive list of topics of interest to the workshop:

Formal Models and Languages for Service Description
Process Models for Composite Services
Service Descriptions and Ontologies
Service Registration, Discovery, and Selection
Service Assembly, Interoperation, and Re-use
Execution and Monitoring of Composite Services
Reasoning about Services and Composite Services
Verification, Proof and Trust Agents
Personalization and Preference Languages
Security
Cross-enterprise service interoperation
Transactional Aspects
Performance Aspects
Distributed and Ambient Computing
Database Services for the Semantic Web
Business and Payment Models
Standards
Applications in Business, Education, Healthcare, Science, Government


Paper Submission and Review
--------------------------

Papers should be submitted via email to the workshop co-chairs
(fabio_casati@hp.com, dp@ics.forth.gr).
Papers submitted to the workshop will undergo a
peer-review process overseen by the program committee co-chairs. Each paper 
will be reviewed by three program commitee members. Accepted papers will 
appear in informal electronic and/or printed proceedings that will be made 
available prior to the workshop. Selected workshop papers will possibly be 
invited for inclusion in a special issue of an international journal.

Papers should not exceed 5000 words (approximately 12 pages) in length and
must be submitted in Postscript or PDF. Short papers (up to 6 pages)
describing early research results are also welcome.


Important Dates
---------------

Deadline of electronic submission: March 10, 2003
Author notification: April 14, 2003
Workshop: May 20, 2003


Workshop Program Committee:

Gustavo Alonso (ETH Zurich)
Boualem Benatallah (Univ. of South Wales)
Bernard Burg (Hewlett-Packard Corp.)
Chris Bussler (Oracle Corp., USA)
Vassilis Christophides (ICS-FORTH, Greece)
Sara Comai (Politecnico di Milano, Italy)
Jonathan Dale (Fujitsu Labs of America, USA)
Asuman Dogac (Middle East Technical University, Turkey)
Alon Halevy (Univ. of Washington, USA)
Sheila McIlraith (Stanford University, USA)
Peter Patel-Schneider (Bell Labs, USA)
Barbara Pernici (Politechnico Di Milano, Italy)
Jerome Simeon (Bell Labs, USA)
Mike Wilde (Argonne National Laboratory, USA)
Steven Willmott (Universitat Politecnica de Catalunya, Spain)

Workshop Steering Committee:

Fabio Casati (Hewlett-Packard)
Vassilis Christophides (ICS-FORTH Crete, Greece)
Rick Hull (Lucent)
Sheila McIlraith (Stanford University)
Dimitris Plexousakis (University of Crete, Greece)

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Date: Thu, 20 Mar 2003 14:22:34 -0500
From: Ed Shaya <edward.j.shaya.1@gsfc.nasa.gov>
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I send this now only to the Knowledge Engineering discussion group.
If after the flames die down there are still pieces left, I will
submit it to the Metadata discussion group.  If any stubs remain after
that, it can go to the VO Query Language discussion group where it
hopefully can be a basis for query development.


Let's first look at a high level model of astronomical knowledge, a
sort of ontology on which to base astronomical ontology.  After this,
we can look into a highest level data model and then see if we
can somehow tie them together so that queries for knowledge can be
transformed into queries on data via a data model.  For this paper,
I just examine the mappings between knowledge and data and not
worry about the mechanics of when or which application takes care of
each step.

1. Ontology

1.1 Classes

Each class has a name, definition, indicative properties, and
prototypes.  Instances of a class are commonly called objects.
A definition may be held in free flowing text, but it usually includes
a set of defining properties within prescribed ranges.  There may
be other properties that are not official defining properties, but
also typically lie within a range and so indicate possible membership
to the class.  Other classes may be subclasses or superclasses of a
given class.  There would be only one superclass for each class if
they reside in a hierarchical scheme, but allowing for more than one
allows for more general and complex topical maps.  The properties of
a subclass would always have property values with ranges within the
ranges of the class.  Prototypes are merely good, nearby instances
of the class.

1.2 Properties

Each property type has a name, definition, domain of applicability,
and range of possible values.  Instances of property types are
simply called properties.  Properties always have names and value
(sometimes called an argument).  A value may be numbers, string, a
numerical range, or a list of strings, numbers or objects of a class.
The more general case of a bag of heterogeneous object types can be
avoided since there can be a separate property for each class in the
range.  The values of a property usually refer to direct measurement
values on an object or to a mathematical expression involving direct
measurement values.  Part of a property's definition may include
instruction on how to create it from a combination of other properties.

The domain is simply the set of classes for which the property type
is valid.  I am not sure it is absolutely necessary to actually make
such an accounting for astronomy.  If no data center responds to a
query for a specific property on a specific class, then you know all
you need to know.  However, if one provides full domain information for
a property one might prevent many fruitless, time consuming queries
from occurring.  Perhaps domains can be periodically updated from
the registry.

1.3 Modifiers

Properties may require modifiers and these also have name and values.
An example of a modifier is withinApertureOfSize that modifies a
brightness property or hasNeighbor.  Another example is epoch which
states the time of the measurement of a property.  Modifiers may
require modifiers, as in units of an aperture size etc.  Modifier
values usually refer to metadata about the instrument, where and when
it was used to make a property measurement.

1.4 A Property Space

Two or more properties can be combined to create a property space,
that is, an N-dimensional combination of N properties.  Rather than
expressing the range of each dimension as a simple segment on the
number line, an N-d geometric shape is required.  One way of expressing
a polygon in this space is to declare a vector with a specified order
for the N properties and then list a set of such vectors that point
to the vertices of the polygon.  More complex shapes would require
mathematical expressions describing the property shape.  Perhaps SVG
(Scalable Vector Graphics) would be helpful for describing this
as well.

1.5 Hierarchical Classification Schemes

In astronomy, there are several general sets of classes that are
arranged into hierarchical classification schemes. If we wish to
think of these in analogy to trees, then at the base of each tree is
a single object type that generalizes the scheme and every subtype of
astronomical object sits on top as branches extending from the base.
Each branch, extending from the base or extending from another branch
is called a class.  In astronomy the most prominent instance of this
is the classification of astronomical objects that has at its base
any type of object in space, astroObject. Other examples of this are
optical instruments, particles (elementary, atoms, and molecules).
But, note well, often the relationships as one traverses from one
level to the next changes.  Some classes are related to its parent
via a subclassOf property, ie. the properties of the child class
takes a subset of values, while others are connected by isMemberOf
or isComponentOf.


1.7 Topical Map

A topical map is similar to a classification scheme except that a
class can have more than one parent class, thus the topology would
be considerably more complex.  A simple example of this: galaxy has
parent classes stellar system and nebula. I would suspect that property
types would require this as well.  It is probably unavoidable that
every hierarchical classification scheme turns into a topical map as
greater details are added.

2. Data Model

We begin (and end) with a common model of information and data,
that there exists data and metadata.  Data, in the NVO context,
should refer to numerical values of the properties of astronomical
objects (real or simulated) and possibly also to instrument calibration
results.  Description and preservation of these values is, and always
has been, the primary function of data repositories in astronomy.
And, if we make this semantic distinction between data and metadata
it becomes  easier to tie astronomical knowledge to data through
class properties.  For each data value there exists several layers
of metadata (real and virtual) that helps to specify the context of
the value.  Metadata elements consists of metadata terms, sometimes
referred to as keywords, and metadata values.  A metadata element can
hold a value or list of values or another element.  If we wish, we
can adopt a VO rule that the mixed case of an element having a value
and a child element is forbidden.  Then, one has terms that are used
to collect together a number of other terms, and terms that merely
hold values.  What we commonly call the items of our data centers,
the images, tables, collections, data sets, can easily be recast into
this model and then the VO designers do not need to look too hard at
the particular demarcations set by each data center for these vaguely
defined items.

A look at two common types should help to understand this.  A typical
table consists of a list of records; each record is a list of fields
that are, for the most part property values of an object given by
the ID value, usually at the beginning of the record.  The data
are the property values and the ID value is actually a metadata
value specifying the object in study.  There is metadata for each
field explicitly giving detailed information about the name of the
property in each field plus modifiers required of the property type.
On occasion there are exceptional fields that hold metadata rather
than data, such as an epoch which modifies the measurement property.
Because queries are usually formed as constraints in coordinate
values, the data center's search tool needs to be alerted that certain
constraints are going to require looking through the tabular values.
It is therefore important that the resource take note that some of
the metadata values are in the fields of the tables.

An image is a bit more deceptive.  Each cell in the image is a datum.
Where that cell pertains to in the sky and when the image was taken
are metadata values, but it is in a condensed form.  The headers
of the image provide coordinate frame of reference and positioning
information so that the coordinates of the cell can be calculated by a
standard algorithm.  Nevertheless, to a high level query system there
should not be a distinction between obtaining the metadata value at
that coordinate if the metadata for that cell is in an algorithmic
form in a header or explicitly present as it would be in a table.

Are coordinate positions metadata or data?  Are they properties
or modifier of properties?  The answer depends on the context.
The location of an object is a property.  So if you are asking for the
location of a star there is hopefully datavailable on the centroid
of its brightness.  If one asks for a brightness profile, then one
is asking for brightness data and one uses the coordinate metadata
on the location of each data point to form a brightness profile.
Thus a query on brightness distributions is a property search but
the required constraints on the coordinates are modifiers.

3. Transforming Problem Statements into Data Query Language.

3.1 Mappings

Keeping the discussion at this level of abstractness is helpful because
indeed one can plug in any specific metadata vocabulary and/or ontology
and it would not change anything here.  And it appears, atleast at
this vantage point, that software could be developed that allows query
for knowledge using the above high level ontological concepts and
that the connection to the data in the above data model context can
be reliably made.  Properties map into data which resides at the top
of the metadata/data hierarchy, property modifiers map into metadata
terms close to the property elements, objects map to ID fields or
object metadata. Class maps to class metadata, but queries that ask
to descend or ascend the hierarchy/topic map will need to be sent to
a specially prepared classification database.   If the software is
written with this level of abstraction in mind, it should be quite
easy to make modifications in metadata terminology without much fuss.

A common knowledge query is to find objects that are
constrained to a given set of property values.  This then translates
into finding data values with metadata terms corresponding to the
property names or to the combination required to form the requested
property.  If a property has modifiers, it is important that both the
query and the metadata at the data centers include these as well.
And it is of course necessary that there is no mix up of modifiers
that may also be used by some other property.  If the search is
constrained by a range in some property value it would be best if
the metadata is queried for minimum/maximum or coverage information
on the property before beginning an actual hunt through the data.
Minimum and Maximum elements within a field is straightforward, but
coverage/spectral is a bit more difficult to connect with a request
for a specific wavelength band.

3.2 Quality report

Whether the user asks for it or not, it is probably a good idea for
quality information to travel with any property value.  The display
software needs to account for this and allow the user to show or hide
this information.

3.3 Multiple responses

3.3.1  Multiple property values

Several resources may respond with slightly different results.
One needs to know the users desire on what to do with these. Choices
are (weighted) average, mean, mode, standard deviation, or simply
take the best quality one.  Software MUST deal with this in some way,
even if it is to take a simple average for everything.  One nice
procedure is to show, within a table cell, all of the values and then
the requested statistic.

3.3.2 Multiple classification

When a query is made for the class of an object, several resources may
respond with different and perhaps contradictory classifications for
a particular object.  This could be a result of poor resolution,
observational noise, or incomplete data.  Not all multiple
classifications are contradictory since it is possible for the
property space of one class to overlap slightly with the property
space of another class.  Also, there may be incomplete observational
data so that discrimination between classes is not yet possible.

It is merited to return all classes attributed to a given object and
links to the resource.  At this time only a human can review the
observational data to assess quality of classification.  However,
for the sake of large statistical studies there should be a user
option to take either the most recent classification or to drop
contradictory or ambiguous classifications.  Statistics on the number
of objects dropped should be reported to the user for this mode to
be scientifically useful.


3.4 Namespace differences

There are a host of subtle differences in terminology or their meanings
that can exist between each resource and we politely refer to these as
namespace differences.  We know what to do when resources use different
words to mean the same thing;  provide namespaced vocabularies and
then create translation software.  The more difficult problems arise
when the meanings are slightly different.  An example of this that
is often given is V_band flux.  The so called V_band filters can
differ significantly between observers resulting in differences in
throughput that may depend on the color of the object.

This issue can be rephrased into a question of how detailed and
complete can we craft property modifiers.  And, can we provide
translation services between modified properties.  For the V_band
case, the band property modifiers needs to include specification on
the band.  Minimally, a name for the subclass of V_band filters can
be given (perhaps, OCLI/F566 or something like that).  There could be
coefficients for transformation to standard Johnson V_band of the form
(A0 + A1(B-V) + A2(B-V)^2 + A3(V-R) + A4(V-R)^2).  Finally, there
could be a table of the response curve as function of wavelength.
The coefficients of transformation can be derived from that.
This could be a link that is attached to the value of the property.
Of course, to implement this you notice that a request for a V_band
measurement turns out to be a request for B,V,R plus transformation
coefficients etc.  Such is the price for scientifically accurate
knowledge.  With time, data centers may choose to provide photometry
pre-transformed into standardly used bands.  Then the users will
benefit from faster response time and the data center will benefit
from lighter load on their servers.

There are paths to ever improving transformation between differences
in exact meaning of data values.  However, sometimes the information has 
been lost over time and is not recoverable.  All we can do there is to
alert the user to this problem.  Perhaps we will need to color code
results (black means transformed, blue means links to transformations
are available, red means no transformation is known).

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From: "Tony Linde" <ael@star.le.ac.uk>
To: "Semantics" <semantics@ivoa.net>
Subject: Cover pages
Date: Thu, 3 Apr 2003 15:20:38 +0100
Organization: University of Leicester
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>From the cover pages:

"Curing the Web's Identity Crisis: Subject Indicators for RDF." By Steve
Pepper and Sylvia Schwab (Ontopia). Ontopia Technical Report. March 2003.
The paper describes the crisis of identity facing the World Wide Web rooted
in a lack of clarity about the nature of 'resources'.
http://www.ontopia.net/topicmaps/materials/identitycrisis.html
http://xml.coverpages.org/xmlPapers200304.html#Pepper

"Topic Maps Model (TMM)." By Steven R. Newcomb, Sam Hunting, Jan
Algermissen, and Patrick Durusau. Produced for ISO/IEC JTC 1/SC34
Information Technology -- Document Description and Processing Languages.
March 28, 2003. Editor's Draft, Revision 2.30. Reference: ISO/IEC JTC 1/SC34
N0393. See also the previous version (1.0). This draft specifies the
information structure of all topic maps, certain common properties of
topics, and constraints on the values of those properties, etc.
http://www.isotopicmaps.org/tmmm/TMMM-2.30/N0393.html
http://xml.coverpages.org/xmlPapers200303.html#TMMM2

"Living With Topic Maps and RDF. Topic Maps, RDF, DAML, OIL, OWL, TMCL." By
Lars Marius Garshol (Ontopia). Discusses how to do data conversion back and
forth between the two, schema conversion, the use of OWL in topic maps, and
the possibility for a common query language.
http://www.ontopia.net/topicmaps/materials/tmrdf.html
http://xml.coverpages.org/xmlPapers200303.html#Garshol

__
Tony Linde                       Phone:  +44 (0)116 223 1292
AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
University of Leicester          Email:  ael@star.le.ac.uk
Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org


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From: Carole Goble <carole@cs.man.ac.uk>
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Tony

have you guys joined the  GGF Sem-Grd mailing list yet? These would be 
useful contributions

Carole

>>From the cover pages:
>
>"Curing the Web's Identity Crisis: Subject Indicators for RDF." By Steve
>Pepper and Sylvia Schwab (Ontopia). Ontopia Technical Report. March 2003.
>The paper describes the crisis of identity facing the World Wide Web rooted
>in a lack of clarity about the nature of 'resources'.
>http://www.ontopia.net/topicmaps/materials/identitycrisis.html
>http://xml.coverpages.org/xmlPapers200304.html#Pepper
>
>"Topic Maps Model (TMM)." By Steven R. Newcomb, Sam Hunting, Jan
>Algermissen, and Patrick Durusau. Produced for ISO/IEC JTC 1/SC34
>Information Technology -- Document Description and Processing Languages.
>March 28, 2003. Editor's Draft, Revision 2.30. Reference: ISO/IEC JTC 1/SC34
>N0393. See also the previous version (1.0). This draft specifies the
>information structure of all topic maps, certain common properties of
>topics, and constraints on the values of those properties, etc.
>http://www.isotopicmaps.org/tmmm/TMMM-2.30/N0393.html
>http://xml.coverpages.org/xmlPapers200303.html#TMMM2
>
>"Living With Topic Maps and RDF. Topic Maps, RDF, DAML, OIL, OWL, TMCL." By
>Lars Marius Garshol (Ontopia). Discusses how to do data conversion back and
>forth between the two, schema conversion, the use of OWL in topic maps, and
>the possibility for a common query language.
>http://www.ontopia.net/topicmaps/materials/tmrdf.html
>http://xml.coverpages.org/xmlPapers200303.html#Garshol
>
>__
>Tony Linde                       Phone:  +44 (0)116 223 1292
>AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
>Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
>University of Leicester          Email:  ael@star.le.ac.uk
>Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org
>
>  
>


From - Thu Apr  3 23:56:55 2003
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From: "Tony Linde" <ael@star.le.ac.uk>
To: "SemGrid" <sem-grd@gridforum.org>, "Semantics" <semantics@ivoa.net>
Subject: event
Date: Thu, 3 Apr 2003 22:50:24 +0100
Organization: University of Leicester
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Is this event any good?

  International Conference on Ontologies, Databases and Applications of
SEmantics
  http://www.cs.rmit.edu.au/fedconf/odbase/2003/

__
Tony Linde                       Phone:  +44 (0)116 223 1292
AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
University of Leicester          Email:  ael@star.le.ac.uk
Leicester, UK   LE1 7RH          Web:    http://www.astrogrid.org

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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Semantics'" <semantics@ivoa.net>
Subject: RE: Cover pages
Date: Thu, 3 Apr 2003 22:52:06 +0100
Organization: University of Leicester
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Status:   

I have now, Carole :)

> -----Original Message-----
> From: Carole Goble [mailto:carole@cs.man.ac.uk] 
> Sent: 03 April 2003 17:29
> To: ael@star.le.ac.uk
> Cc: Semantics; dder@ecs.soton.ac.uk
> Subject: Re: Cover pages
> 
> 
> 
> 
> Tony
> 
> have you guys joined the  GGF Sem-Grd mailing list yet? These 
> would be 
> useful contributions
> 
> Carole
...

From - Tue Apr 29 11:14:49 2003
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  Hello,

  The paper on UCDs that was submitted to the 
ESSW03 Workshop (E-Services and the Semantic Web)
has been accepted!
  This Workshop is part of the 12th WWW conference
held in Budapest this year (workshop on May 20).
  I have placed a copy of the paper on the Wiki Website:
http://www.ivoa.net/twiki/bin/view/IVOA/IvoaUCD

Sebastien.

-- 
    _______
   /  ~   /, Sebastien Derriere   mailto:derriere@astro.u-strasbg.fr
  / ~~~~ //  Observatoire de Strasbourg    Phone +33 (0) 390 242 444
 /______//   11, rue de l'universite     Telefax +33 (0) 390 242 417
(______(/    F-67000 Strasbourg  France

From owner-grid@eso.org  Fri Sep 19 11:22:39 2003
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From: Nicholas Walton <naw@ast.cam.ac.uk>
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cc: semantic@ivoa.net, <net@ivoa.net>
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Dear All, 

at the upcoming Global Grid Forum meeting in Chicago (5-8 Oct 2003) - see 
www.ggf.org - there will be a Birds of a Feather session which starts of 
the process of forming a Astronomy Research Group at the GGF. I attach the 
draft charter to this message. 

This will give the Astro and IVOA VO communities a chance to input astro 
requirements into the 'grid' standards process. 

I would encourage those of you interested in this area to aim to attend 
this GGF meeting. Hope to see you there. (Note that early registration 
closes sept 26.)

Please forward this message to those that may be interested. 

Yours

Nic Walton

========================================================================
Dr N. A. Walton                  
(AstroGrid Project Scientist)   Tel:   +44 1223 337503 
Institute of Astronomy          FAX:   +44 1223 337523
University of Cambridge         WWW:   http://www.astrogrid.org
Madingley Road                  WWW:   http://www.ast.cam.ac.uk/~naw
Cambridge, CB3 0HA              email: naw@ast.cam.ac.uk
========================================================================


-----------

>From spartz@ggf.org Fri Sep 19 10:16:21 2003
Date: Thu, 18 Sep 2003 13:38:01 -0500
From: Clare Spartz <spartz@ggf.org>
To: ggf-membership@ggf.org
Cc: membership@ggf.org
Subject: [ggf-membership] Just Over Two Weeks Away -- GGF9 - October 4-8 -
    Chicago

GGF9 - The Ninth Global Grid Forum 
October 5-8, Chicago, IL USA 
Chicago Sheraton Hotel and Towers 


42 working groups and research groups gathering for 4 days working 
together to build a standards-based foundation for Grid computing. 

Nine sessions will focus on finalizing proposed charters for new 
working groups and research groups, including: 
	*  Business Process Grid 
	*  Configuration Description, Deployment, and Lifecycle
Management 
	*  Workflow Management 
	*  Grid API 

In addition to working sessions where community practices and 
specifications are being developed, GGF9 will include four full-day
workshops: 
	*  Designing and Building Grid Services (OGSA/OGSI teams) 
	*  Life Sciences Grid (Applications and requirements for 
	   bioinformatics, pharmaceuticals, etc.) 
	*  Peer-to-Peer and Grids: Synergies and Opportunities 
	*  Semantic Grid 


***Important dates are approaching***

Advance Registration - available through September 26  - GGF MEMBERS
save MORE MONEY
http://www.globalgridforum.org/Meetings/ggf9/reg.htm 
Hotel Availability - space and special GGF rate guaranteed through
September 26 
http://www.ggf.org/Meetings/ggf9/lodging.htm 

***GGF9 Schedule***
http://www.globalgridforum.org/Meetings/ggf9/schedule.htm 
Find "Click here to download the full GGF9 Schedule at a Glance" 


The Complete List of Sessions/Workshops and BOFs: 
WORKSHOPS = 4 
		Designing and Building Grid Services, led by Ian Foster
et. al.
		P2P and Grids: Synergies and Opportunities, led by
Andrew Chien et. al.
		Semantic Grid Workshop, led by David de Roure et. al.
		Life Sciences Grid Workshop, led by Abbas Farazdel
et.al. 

WG/RG SESSIONS = 56 
		Grid Checkpoint Recovery (GridCPR-WG) 
		Grid Remote Procedure Call (GridRPC-WG)
		Advanced Collaborative Environments (ACE-RG)
		Applications and Test Beds (APPS-RG)
		Grid Computing Environments (GCE-RG)
		Grid User Services (GUS-RG)
		Life Sciences Grid (LSG-RG)
		Production Grid Management (PGM-RG)
		User Program Development Tools for the Grid (UPDT-RG) 
		Open Grid Service Common Management Model (CMM-WG)
		Open Grid Services Architecture (OGSA-WG)
		Open Grid Services Infrastructure (OGSI-WG)
		Grid Policy Architecture (Policy-RG)
		Grid Protocol Architecture (GPA-RG)
		Semantic Grid (SEM-RG) 
		Data Access and Integration Services (DAIS-WG)
		Data Format Description Language (DFDL-WG)
		GridFTP-WG
		IPv6 (IPv6-WG)
		OGSA Data Replication Services (OREP-WG)
		Data Transport (DT-RG)
		Grid High-Performance Networking (GHPN-RG)
		Persistent Archives (PA-RG) 
		Authorization Frameworks and Mechanisms (AuthZ-WG)
		CA Ops (CAOPs-WG)
		Open Grid Service Architecture Authorization (OGSA
AUTHZ-WG)
		Site Authentication, Authorization, and Accounting
Requirements (SAAA-RG) 
		CIM based Grid Schema (CGS-WG)
		Network Measurement (NM-WG)
		Grid Information Retrieval (GIR-WG)
		Grid Benchmarking (GB-RG)
		Relational Grid Information Services (RGIS-RG) 
		Appliance Aggregation (APPAGG-RG)
		OGSA-P2P-Security (OGSAP2P-RG) 
		Distributed Resource Management Application API
(DRMAA-WG)
		Grid Economic Services Architecture (GESA-WG)
		Grid Resource Allocation Agreement Protocol (GRAAP-WG)
		Job Submission Description Language (JSDL-WG)
		OGSA Resource Usage Service (RUS-WG)
		Usage Record (UR-WG)
		Grid File Systems 


BOF's = 9
		Astronomical Grid Community-RG
		Grid Support for Ubiquitous Computing-RG
		Grid Federations
		Grid Scheduling Ontology-WG
		Workflow Management-RG
		Business Process Grid-WG
		Metadata Management Services Architecture-WG
		Grid API-WG 
		Configuration Description, Deployment, and Lifecycle
Management-WG


GGF Sponsors at GGF9: 
http://www.globalgridforum.org/L_Involved_Sponsors/2003_spons.htm 
GGF9 Participants (as of September 12): 
http://www.globalgridforum.org/Meetings/ggf9/participants.htm 
Exploring Chicago: 
http://www.ci.chi.il.us/Tourism/ 

GGF Members Register NOW: Right Price and Guaranteed Room Rate; Meeting
with the CORE 
international Grid COMMUNITY ; Learning through Workshops; Continue to
BE a part of the GRID action!! 

Contact membership@ggf.org if you've forgotten your Y2003 GGF Individual
Membership number!!

See you in Chicago!!

Clare Spartz 
Director of Marketing and Membership 
Global Grid Forum 
work: +1.630.252.0924 
cell: +1.917.860-9126 
fax: +1.630-252-4466 
spartz@ggf.org 







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Date: Fri, 19 Sep 2003 10:26:14 +0100 (BST)
From: Nicholas Walton <naw@ast.cam.ac.uk>
To: semantics@ivoa.net
Subject: GGF Astro BOF (fwd)
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-- 
========================================================================
Dr N. A. Walton                  
(AstroGrid Project Scientist)   Tel:   +44 1223 337503 
Institute of Astronomy          FAX:   +44 1223 337523
University of Cambridge         WWW:   http://www.astrogrid.org
Madingley Road                  WWW:   http://www.ast.cam.ac.uk/~naw
Cambridge, CB3 0HA              email: naw@ast.cam.ac.uk
========================================================================


---------- Forwarded message ----------
Date: Fri, 19 Sep 2003 10:22:11 +0100 (BST)
From: Nicholas Walton <naw@ast.cam.ac.uk>
To: ivoa@ivoa.net, grid@ivoa.net
Cc: semantic@ivoa.net, net@ivoa.net
Subject: GGF Astro BOF 

Dear All, 

at the upcoming Global Grid Forum meeting in Chicago (5-8 Oct 2003) - see 
www.ggf.org - there will be a Birds of a Feather session which starts of 
the process of forming a Astronomy Research Group at the GGF. I attach the 
draft charter to this message. 

This will give the Astro and IVOA VO communities a chance to input astro 
requirements into the 'grid' standards process. 

I would encourage those of you interested in this area to aim to attend 
this GGF meeting. Hope to see you there. (Note that early registration 
closes sept 26.)

Please forward this message to those that may be interested. 

Yours

Nic Walton

========================================================================
Dr N. A. Walton                  
(AstroGrid Project Scientist)   Tel:   +44 1223 337503 
Institute of Astronomy          FAX:   +44 1223 337523
University of Cambridge         WWW:   http://www.astrogrid.org
Madingley Road                  WWW:   http://www.ast.cam.ac.uk/~naw
Cambridge, CB3 0HA              email: naw@ast.cam.ac.uk
========================================================================


-----------

>From spartz@ggf.org Fri Sep 19 10:16:21 2003
Date: Thu, 18 Sep 2003 13:38:01 -0500
From: Clare Spartz <spartz@ggf.org>
To: ggf-membership@ggf.org
Cc: membership@ggf.org
Subject: [ggf-membership] Just Over Two Weeks Away -- GGF9 - October 4-8 -
    Chicago

GGF9 - The Ninth Global Grid Forum 
October 5-8, Chicago, IL USA 
Chicago Sheraton Hotel and Towers 


42 working groups and research groups gathering for 4 days working 
together to build a standards-based foundation for Grid computing. 

Nine sessions will focus on finalizing proposed charters for new 
working groups and research groups, including: 
	*  Business Process Grid 
	*  Configuration Description, Deployment, and Lifecycle
Management 
	*  Workflow Management 
	*  Grid API 

In addition to working sessions where community practices and 
specifications are being developed, GGF9 will include four full-day
workshops: 
	*  Designing and Building Grid Services (OGSA/OGSI teams) 
	*  Life Sciences Grid (Applications and requirements for 
	   bioinformatics, pharmaceuticals, etc.) 
	*  Peer-to-Peer and Grids: Synergies and Opportunities 
	*  Semantic Grid 


***Important dates are approaching***

Advance Registration - available through September 26  - GGF MEMBERS
save MORE MONEY
http://www.globalgridforum.org/Meetings/ggf9/reg.htm 
Hotel Availability - space and special GGF rate guaranteed through
September 26 
http://www.ggf.org/Meetings/ggf9/lodging.htm 

***GGF9 Schedule***
http://www.globalgridforum.org/Meetings/ggf9/schedule.htm 
Find "Click here to download the full GGF9 Schedule at a Glance" 


The Complete List of Sessions/Workshops and BOFs: 
WORKSHOPS = 4 
		Designing and Building Grid Services, led by Ian Foster
et. al.
		P2P and Grids: Synergies and Opportunities, led by
Andrew Chien et. al.
		Semantic Grid Workshop, led by David de Roure et. al.
		Life Sciences Grid Workshop, led by Abbas Farazdel
et.al. 

WG/RG SESSIONS = 56 
		Grid Checkpoint Recovery (GridCPR-WG) 
		Grid Remote Procedure Call (GridRPC-WG)
		Advanced Collaborative Environments (ACE-RG)
		Applications and Test Beds (APPS-RG)
		Grid Computing Environments (GCE-RG)
		Grid User Services (GUS-RG)
		Life Sciences Grid (LSG-RG)
		Production Grid Management (PGM-RG)
		User Program Development Tools for the Grid (UPDT-RG) 
		Open Grid Service Common Management Model (CMM-WG)
		Open Grid Services Architecture (OGSA-WG)
		Open Grid Services Infrastructure (OGSI-WG)
		Grid Policy Architecture (Policy-RG)
		Grid Protocol Architecture (GPA-RG)
		Semantic Grid (SEM-RG) 
		Data Access and Integration Services (DAIS-WG)
		Data Format Description Language (DFDL-WG)
		GridFTP-WG
		IPv6 (IPv6-WG)
		OGSA Data Replication Services (OREP-WG)
		Data Transport (DT-RG)
		Grid High-Performance Networking (GHPN-RG)
		Persistent Archives (PA-RG) 
		Authorization Frameworks and Mechanisms (AuthZ-WG)
		CA Ops (CAOPs-WG)
		Open Grid Service Architecture Authorization (OGSA
AUTHZ-WG)
		Site Authentication, Authorization, and Accounting
Requirements (SAAA-RG) 
		CIM based Grid Schema (CGS-WG)
		Network Measurement (NM-WG)
		Grid Information Retrieval (GIR-WG)
		Grid Benchmarking (GB-RG)
		Relational Grid Information Services (RGIS-RG) 
		Appliance Aggregation (APPAGG-RG)
		OGSA-P2P-Security (OGSAP2P-RG) 
		Distributed Resource Management Application API
(DRMAA-WG)
		Grid Economic Services Architecture (GESA-WG)
		Grid Resource Allocation Agreement Protocol (GRAAP-WG)
		Job Submission Description Language (JSDL-WG)
		OGSA Resource Usage Service (RUS-WG)
		Usage Record (UR-WG)
		Grid File Systems 


BOF's = 9
		Astronomical Grid Community-RG
		Grid Support for Ubiquitous Computing-RG
		Grid Federations
		Grid Scheduling Ontology-WG
		Workflow Management-RG
		Business Process Grid-WG
		Metadata Management Services Architecture-WG
		Grid API-WG 
		Configuration Description, Deployment, and Lifecycle
Management-WG


GGF Sponsors at GGF9: 
http://www.globalgridforum.org/L_Involved_Sponsors/2003_spons.htm 
GGF9 Participants (as of September 12): 
http://www.globalgridforum.org/Meetings/ggf9/participants.htm 
Exploring Chicago: 
http://www.ci.chi.il.us/Tourism/ 

GGF Members Register NOW: Right Price and Guaranteed Room Rate; Meeting
with the CORE 
international Grid COMMUNITY ; Learning through Workshops; Continue to
BE a part of the GRID action!! 

Contact membership@ggf.org if you've forgotten your Y2003 GGF Individual
Membership number!!

See you in Chicago!!

Clare Spartz 
Director of Marketing and Membership 
Global Grid Forum 
work: +1.630.252.0924 
cell: +1.917.860-9126 
fax: +1.630-252-4466 
spartz@ggf.org 







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From owner-semantics@eso.org  Wed Jun  1 21:21:27 2005
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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: "Semantics" <semantics@ivoa.net>
Subject: FW: [Ontology] UCDs vs ontologies?
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... (double-posted)

Hi Ed,

Count me in too. In fact, you can count a whole sub-group of the VOTech
project, DS5. Check out:
http://wiki.eurovotech.org/bin/view/VOTech/ResourceDiscovery and associated.

And you don't need a new group, there already is one, the semantics
workgroup:

  semantics@ivoa.net
  archive at: http://ivoa.net/forum/semantics/

It was set up after discussions between variouspeople a couple of years ago
but died out.

I'll repost this message there (since I *HATE* cross-posting) and suggest we
all adjourn to the semantics forum for ontology-like discussions.

Cheers,
Tony. 

> -----Original Message-----
> From: owner-dm@eso.org [mailto:owner-dm@eso.org] On Behalf Of Ed Shaya
> Sent: 01 June 2005 19:42
> To: Elizabeth Auden
> Cc: Rob Seaman; ucd-sci@ivoa.net; ucd@ivoa.net; ucd-tech@ivoa.net; 
> Data Model IVOA List
> Subject: Re: [Ontology] UCDs vs ontologies?
> 
> Elizabeth,
>    
>     Hurray.  Another ontology fan.  I have taken the liberty of using 
> OwlDoc in Protege to create a browser readable version of your 
> ontology.  It is at
> 
> http://archive.astro.umd.edu/ont/Documentation/VOEVENT/index.html
> 
> Would you mind if I integrate what you have into the more general 
> ontology that I have been working on?
> http://archive.astro.umd.edu/ont/Documentation/index.html
> (And yes, Rob it does tend to get big, but one can trim it at any 
> level.  I rather see UCDs as a form of topic maps which is quite a 
> close relative of Ontology.  I prefer ontology because I believe one 
> can do more rigorous reasoning and query with it, but many prefer 
> topic maps because they are more loose and easy. )
> 
> Now that there are two of us interested in Ontology we can form a 
> group.  It has been suggested to me that Ontology discussions should 
> reside in the data model group with "[Ontology]" in the subject Re:.  
> So, I am ccing there too and will take the rest of this discussion 
> there.  I hope you are tuned in Elizabeth.
> 
> Ed
> 
> 
> 
> 
> Elizabeth Auden wrote:
> 
> >
> > Incidentally, I've posted a first go at a VOEvent ontology (OWL-DL
> > format) on the VOTech wiki at
> > http://wiki.eurovotech.org/bin/view/VOTech/VoEventOntology. Any 
> > comments on the structure, concepts, and coverage of this
> v0.000000001
> > ontology would be appreciated.
> >
> > cheers,
> > Elizabeth
> >
> 
> 

From owner-semantics@eso.org  Wed Jun  1 21:48:35 2005
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Cross posting from data modeling.

Elizabeth,
   I will try to answer some of your questions posted at the ivoa web site.

   * How do I include objects and properties from one OWL formatted
     ontology into another OWL formatted ontology? For instance, the
     WhenWhere element of the VOEvent schema can "be any legal STC
     expression", according to VOEvent 0.90. It would make more sense
     to develop an ontology(ies) for STC and reference the classes /
     properties from VOEvent than it would be to shoehorn all of STC
     into the VOEvent ontology.

First you need to import the other ontology:
<owl:Ontology rdf:about="">
   <owl:imports rdf:resource="STC.owl"/>
</owl:Ontology>
Then you just use them.  In this case you want 
http://ivoa.org/ont/STC.owl#STCEntity to be a subclass of WhenWhere.  Or 
you could add STCEntity in the range of hasWhenWhere.
Version 3.1 is better at working with multiple ontologies.
By the way, I am planning on working on STC.owl soon.  But you are 
welcome to take a first crack at it if you wish.

   * *Note*: I use the suggested Protege tutorial notation for object
     properties, beginning the property name with "has" or "is".
     However, I use datatype properties to represent attributes, and I
     simply give these properties the name of the attribute. Is this
     bad practice?

I am doing essentially the same thing.  Also, I am making classes begin 
with a capital letter and properties (object or dataproperties) start 
with a lower case letter.  But I could easily be convinced to have both 
start with lower case unless it is a mnemonic or a proper name.

   * The above notation has brought up a problem: for instance, both
     the Param and Importance classes have a value attribute. For
     Param, value should be a string, but for Importance, value should
     be an integer. Should I forget about naming datatype properties
     after attributes and create two new datatype properties,
     hasStringValue and hasIntegerValue?

a) your way.
b) One could just use string and then any number is acceptable as well.
c) One could use xsd:AnySimpleType for value and then in Param restrict 
it to xsd:string and in Importance restrict it to integer.

Note that I prefer q:hasValue which takes a q:Quantity which has datum, 
error, and units.  Of course then one has an issue with datum.

   * The Protege tutorial advises that properties should have
     descriptive, human readable names. The "English Prose Tooltip
     Generator" can take advantage of such property names by turning
     them into specific property descriptions in documentation.

I have not seen this yet.

   * There is currently no hierarchy of "is a" relationships - classes
     are related by "has a" relationships instead. Is this bad
     practice? Should the ontology be reorganized into a hierarchy of
     concepts rather than reflecting the VOEvent schema structure?

You did good.  The terms in VOEvent do have superclasses in the larger 
ontology that I am working on, but these were not needed in what your 
small cut.  As one digs in deeper one may find one needs subclasses.  
Classification may require subclass spectralClassificat which has 
subclass MKClassification which has subclass MKLuminosityClassification etc.

   * Technical detail - the RTML UML for Contact shows one option of
     FirstName plus LastName as an alternative to Name. How do I
     reflect this "!FirstName must be accompanied by LastName"? I bet
     this is a rules engine thing.

Not sure, what you mean.  LastName can be functional, meaning one value 
is required.  Beyond that one can specify the cardinality.

   * Can all cardinalities or 1:N restrictions be set in the rules
     engine, or is there a better way to do that?

In the class menu, right click on the property and choose the 
cardinality.  At least that is how it is in 3.1.

   * Is there any reason for or against making any or all of these
     classes disjoint?

Not here.  Be careful with disjoint.  It can blow up the size of the 
ontology with little benefit.  A case where setting classes as disjoint 
is useful is to explicitly say that you will not tolerate a galaxy 
instance being classified as elliptical in one place and as a spiral in 
another.  You are then saying that we can not go on until this conflict 
is resolved.


Ed

Elizabeth Auden wrote:

>> On the other hand, we're told that the role of UCDs is distinct from 
>> that of ontologies.  An ontology is an (attempt) at expressing the 
>> complete range of some knowledge domain.  Astronomy is a big subject 
>> - its ontology will be big.
>
>
>> Personally, I think the VO community will need to develop several 
>> separate ontologies over time as well as several separate glossaries 
>> of UCDs or UCD-like constructs.  It is not obvious that a glossary of 
>> UCDs for tabular convenience is equivalent to a glossary of UCDs for 
>> VOEvent convenience.  An ontology can afford to be large and unwieldy 
>> to reach its goal of being complete and accurate.
>
>
> Incidentally, I've posted a first go at a VOEvent ontology (OWL-DL 
> format) on the VOTech wiki at 
> http://wiki.eurovotech.org/bin/view/VOTech/VoEventOntology. Any 
> comments on the structure, concepts, and coverage of this v0.000000001 
> ontology would be appreciated.
>
> cheers,
> Elizabeth
>


From owner-semantics@eso.org  Thu Jun  2 11:34:34 2005
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Subject: RE: [Ontology] UCDs vs ontologies?
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Hello all

I've been more or less silently lurking at IVOA work since 2002 or such, and will be happy
to bring some input, bandwidth permitting, to IVOA "ontological effort" - so to speak :)

I had a look at the first cut at
http://wiki.eurovotech.org/pub/VOTech/VoEventOntology/VOEventOntology_v0.1.owl

First remarks, more to come certainly. Please take those as "thinking aloud" at that
point.

- I would suggest the choice of a "proper" IVOA namespace, not the default Protege one
http://www.owl-ontologies.com/unnamed.owl# - which kind of sucks.

Suggestion : http://www.ivoa.net/voevent#
(go under Protege "Metadata" tab to change that). I will use vo: as a shortcut for this
namespace hereafter

- Concerning vo:ucd. Since UCD vocabulary, as I understand, is going to be a controlled
one, should be good to have a class vo:UCD of which instances will be those UCD
descriptors, whatever those will look like at the end of the day. BTW have UCD folks
consider the SKOS [1] format for RDF expression of UCD vocabulary?
Then the current vo:ucd property would shift from owl:DatatypeProperty to
owl:ObjectProperty, and renamed certainly something like vo:hasUCD, with range vo:UCD

- Same remarks for vo:unit. There are a few ontologies of units around that might be worth
considering, like [2]

- The other way round, I'm puzzled by Classes like vo:PublisherID and vo:EventID. Why not
simply have some identifying DatatypeProperty on vo:Publisher and vo:VOEvent? Actually in
RDF, you do not need in theory any specific identifying property, since the URI is *the*
identifier for all classes and instances ... but things may be trickier (see [3] for more
about identity issues).

- I'm not sure about semantics of classes like vo:What vo:WhenWhere and vo:How. I guess
those look like abstract classes needing specific subclasses. What about adding vo:Who?
Maybe they could be gathered under a common superclass like vo:W5 (the 5 W's).

- I agree that declaration of disjoint classes is worth thinking about. Those declarations
are needed when the ontological general framework allows multiple instantiations. In a
scientific framework like IVOA, I'm not sure this is likely to happen. There is in fact
often an implicit assumption in many ontology-driven systems that direct subclasses of
"Thing" are disjoint even if not declared so ...

- Bottom line, more "Big Picture" : Should be good to think about what is VO-specific and
what could be generic to any scientific framework. I'm currently working for a big project
in the framework of Bio-Medical Science [4], I'm aware of similar efforts in Environmental
and Earth Sciences too [5] and there are certainly more ongoing. I think
cross-pollinization of those projects, avoiding overlap and redundancy of efforts, would
be a great thing. Maybe it's time to overcome the trend towards over-specialization
leading to multiplication of domain languages, and de facto as many ontologies as various
science domains. There might be hopefully still some common ontological consensus across
the scientific community at large, on notions such as System, Object, Observation, Event,
Phenomenum, Experiment, Protocol, Model, Hypothesis, Space-Time, Units ... I would be very
happy to participate in any effort to develop such a generic "science ontology" with
experts from various domains. Volunteers, step forward :))

Thanks for your attention.

Bernard

[1] http://www.w3.org/2004/02/skos/
[2] http://sweet.jpl.nasa.gov/ontology/units.owl
[3] http://universimmedia.blogspot.com
[4] http://europa.eu.int/comm/research/fp6/p1/innovative-medicines/index_en.html
[5] http://esto.nasa.gov/conferences/estc2004/papers/a5p1.pdf

**********************************************************************************

Bernard Vatant
Senior Consultant
Knowledge Engineering
bernard.vatant@mondeca.com

"Making Sense of Content" :  http://www.mondeca.com
"Everything is a Subject" :  http://universimmedia.blogspot.com

**********************************************************************************

> -----Message d'origine-----
> De : owner-semantics@eso.org [mailto:owner-semantics@eso.org]De la part
> de Tony Linde
> Envoye : mercredi 1 juin 2005 21:21
> A : Semantics
> Objet : FW: [Ontology] UCDs vs ontologies?
>
>
> ... (double-posted)
>
> Hi Ed,
>
> Count me in too. In fact, you can count a whole sub-group of the VOTech
> project, DS5. Check out:
> http://wiki.eurovotech.org/bin/view/VOTech/ResourceDiscovery and associated.
>
> And you don't need a new group, there already is one, the semantics
> workgroup:
>
>   semantics@ivoa.net
>   archive at: http://ivoa.net/forum/semantics/
>
> It was set up after discussions between variouspeople a couple of years ago
> but died out.
>
> I'll repost this message there (since I *HATE* cross-posting) and suggest we
> all adjourn to the semantics forum for ontology-like discussions.
>
> Cheers,
> Tony.
>
> > -----Original Message-----
> > From: owner-dm@eso.org [mailto:owner-dm@eso.org] On Behalf Of Ed Shaya
> > Sent: 01 June 2005 19:42
> > To: Elizabeth Auden
> > Cc: Rob Seaman; ucd-sci@ivoa.net; ucd@ivoa.net; ucd-tech@ivoa.net;
> > Data Model IVOA List
> > Subject: Re: [Ontology] UCDs vs ontologies?
> >
> > Elizabeth,
> >
> >     Hurray.  Another ontology fan.  I have taken the liberty of using
> > OwlDoc in Protege to create a browser readable version of your
> > ontology.  It is at
> >
> > http://archive.astro.umd.edu/ont/Documentation/VOEVENT/index.html
> >
> > Would you mind if I integrate what you have into the more general
> > ontology that I have been working on?
> > http://archive.astro.umd.edu/ont/Documentation/index.html
> > (And yes, Rob it does tend to get big, but one can trim it at any
> > level.  I rather see UCDs as a form of topic maps which is quite a
> > close relative of Ontology.  I prefer ontology because I believe one
> > can do more rigorous reasoning and query with it, but many prefer
> > topic maps because they are more loose and easy. )
> >
> > Now that there are two of us interested in Ontology we can form a
> > group.  It has been suggested to me that Ontology discussions should
> > reside in the data model group with "[Ontology]" in the subject Re:.
> > So, I am ccing there too and will take the rest of this discussion
> > there.  I hope you are tuned in Elizabeth.
> >
> > Ed
> >
> >
> >
> >
> > Elizabeth Auden wrote:
> >
> > >
> > > Incidentally, I've posted a first go at a VOEvent ontology (OWL-DL
> > > format) on the VOTech wiki at
> > > http://wiki.eurovotech.org/bin/view/VOTech/VoEventOntology. Any
> > > comments on the structure, concepts, and coverage of this
> > v0.000000001
> > > ontology would be appreciated.
> > >
> > > cheers,
> > > Elizabeth
> > >
> >
> >
>


From owner-semantics@eso.org  Thu Jun  2 12:33:14 2005
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From: Elizabeth Auden <eca@mssl.ucl.ac.uk>
To: Semantics <semantics@ivoa.net>
Subject: RE: [Ontology] UCDs vs ontologies?
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Hi Ed,

Thanks for all your comments.

> Would you mind if I integrate what you have into the more general
> ontology that I have been working on?
> http://archive.astro.umd.edu/ont/Documentation/index.html

Yes, that would be fine.

> I will try to answer some of your questions posted at the ivoa web site.

> > How do I include objects and properties from one OWL formatted
> > ontology into another OWL formatted ontology?

> First you need to import the other ontology:

Thanks for that. I'll incorporate the ontology imports and other
suggestions below into the next version of my VOEvent OWL file.

> By the way, I am planning on working on STC.owl soon.  But you are
> welcome to take a first crack at it if you wish.

Race you! I can definitely have a go - I'll aim to post a first cut
towards the end of next week. STC 1.21, yes?

> I am doing essentially the same thing.  Also, I am making classes begin
> with a capital letter and properties (object or dataproperties) start
> with a lower case letter.

Great, I think that our formats will be in agreement then:
Classes: Class, ClassName, NameOfClass
Properties: property, propertyName, nameOfProperty

> But I could easily be convinced to have both start with lower
> case unless it is a mnemonic or a proper name.

Using "IVOA" as an example, would it be better to go with

Classes: IVOAclass, IVOAClass, IvoaClass?
Properties: IVOAproperty, IVOAProperty, ivoaProperty?

> > the Param and Importance classes have a value attribute. For
> > Param, value should be a string, but for Importance, value should
> > be an integer.

> a) your way.
> b) One could just use string and then any number is acceptable as well.
> c) One could use xsd:AnySimpleType for value and then in Param restrict
> it to xsd:string and in Importance restrict it to integer.
> Note that I prefer q:hasValue which takes a q:Quantity which has datum,
> error, and units.  Of course then one has an issue with datum.

Hmm. I will play around with a mix of c) and your suggestion for
"hasValue" and see what happens.

> > "English Prose Tooltip Generator"

> I have not seen this yet.

I haven't either, and googling for the phrase only turns the OWL tutorial
where I found the reference. However, there seem to be a number of other
tooltip generators that provide useful mouse-over documentation. I'll
contact the OWL tutorial guys at Manchester and see what they can tell me
about this software.

> The terms in VOEvent do have superclasses in the larger ontology that I
> am working on, but these were not needed in what your small cut.


I'll leave them alone for now  - it will be interesting to see what
superclasses arise as small ontologies are federated. Bernard brought up a
good point in another email to the IVOA semantics about "What" and
"WhereWhen" being awkward names for classes, although these came from the
VOEvent document. If this small ontology is subsumed into a larger STC or
"all space" ontology, it would make sense to map the What and WhereWhen
concepts to other location and time superclasses. However, if this
ontology should stick closely to the VOEvent schema, What and WhereWhen
may need to stay.

> Re: cardinalities and disjoint

Thanks for the pointers; I'll specify cardinality where appropriate in the
next version and leave out disjoints until a classes that actually need to
be disjoint arise.

cheers,
Elizabeth

From owner-semantics@eso.org  Thu Jun  2 12:50:45 2005
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From: Elizabeth Auden <eca@mssl.ucl.ac.uk>
To: Semantics <semantics@ivoa.net>
Subject: Ontology: "English prose tooltip generator"
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>> > "English Prose Tooltip Generator"
>> I have not seen this yet.

Taking a closer look at the Protege Tutorial where I found this reference 
(http://www.co-ode.org/resources/tutorials/ProtegeOWLTutorial.pdf), the 
guide uses Protege 2.1. A diagram on page 53 shows the English Prose 
Tooltip Generator button in the toolbar next to the "Show Protege-OWL 
Syntax" button.

I'm using Protege 3.0, and I can't see the Tooltip Generator button in my 
toolbar. However, hovering over any class name will bring up a tooltip box 
listing "necessary conditions". The tooltip boxes don't seem to be 
appearing over my property names, however.

cheers,
Elizabeth

From owner-semantics@eso.org  Thu Jun  2 12:56:28 2005
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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: "Semantics" <semantics@ivoa.net>
Subject: Semantics IG charter
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I've been asked by the IVOA Exec to prepare a charter for the Semantics IG
since it seems to have woken up again (and if we keep feeding it regular
stimulants, maybe it'll stay awake this time).

Can I ask for a couple of volunteers to help me knock up a charter that can
be posted to this list for comment and amendment and then to the Exec for
approval?

Thanks,
Tony. 

-- 
Tony Linde
Phone:  +44 (0)116 223 1292      Mobile: +44 (0)7753 603356
Fax:    +44 (0)116 252 3311      Email:  Tony.Linde@leicester.ac.uk
Skype:  callto:tonylinde (home)  callto:tonylinde2 (work)
Post:   Department of Physics & Astronomy, University of Leicester
        Leicester, UK   LE1 7RH
Web:    http://www.star.le.ac.uk/~ael
            
Project Manager, EuroVO VOTech   http://eurovotech.org 
Programme Manager, AstroGrid     http://www.astrogrid.org 
Co-Director,
 Leicester e-Science Centre      http://www.e-science.le.ac.uk/ 

From owner-semantics@eso.org  Thu Jun  2 16:36:38 2005
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Subject: Re: [Ontology] UCDs vs ontologies?
References: <20050531150728.fn26pj7v9fa8okc8@webmail.sic.rm.cnr.it>	 <94643280d46f33e5c88952d520f13f55@Astro.physik.Uni-Goettingen.DE>	 <429D79B3.3@cea.fr> <0a75e9e971886f955bcd71d196c35f79@Astro.physik.Uni-Goettingen.DE>	 <429DBE0C.7060905@cea.fr> <EB6B2AC0-5268-4F2E-8DA7-FCD728C7B9FE@noao.edu> <Pine.LNX.4.61.0506011639350.29094@msslta.mssl.ucl.ac.uk> <429F0EB8.7EFBCA2D@astro.u-strasbg.fr>
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Are these discussions going to be on dm or semantics?  We had better 
decide fast.  I had spoken with Jonathan just a few days ago and he felt 
this logically belonged inside of dm.  I agreed with him because 
Ontology should be a basic component (an early stage) of data modeling.  
But then Tony Linde reminded me that there already is a semantics site 
and that is where it belongs.  That makes sense too.  What do others think?

Ed



Sebastien Derriere wrote:

>[posted to dm only to avoid cross-posting]
>
>Elizabeth Auden wrote:
>  
>
>>Incidentally, I've posted a first go at a VOEvent ontology (OWL-DL format)
>>on the VOTech wiki at
>>http://wiki.eurovotech.org/bin/view/VOTech/VoEventOntology. Any comments
>>on the structure, concepts, and coverage of this v0.000000001 ontology
>>would be appreciated.
>>    
>>
>
>  Hi,
>
>  Reading the questions you list in the above page, I have a comment
>on points 2 and 3.
>  When trying to build small ontologies, I found (and still do find)
>extremely stupid to be "forced" to define one slot dedicated to each
>class
>to indicate "hasSomething".
>  In your example, Contact / hasContact , How / hasHow, What / hasWhat,
>....
>I found this (and this is the case in every example I could find) awful.
>
>  I wish we could define something where we don't have to be omniscients
>when building the ontology, but where the ability to make reasonning
>would
>not be lost. Something like:
>  - Having a class named Property
>  - Having classes Contact, How, What, ... being subclasses of Property
>(these classes might have many superclasses)
>  - Having a unique slot "hasProperty" with a value being a Class, with
>the allowed class "Property" (thus also allowing Property's subclasses)
>
>  That way, instead of having to define zillions of slots (i.e. at least
>one
>per new subclass of Property) and writing:
>
>MyConcept hasContact Contact
>MyConcept hasHow How
>MyConcept hasWhat What
>.... and as many as there are different possible properties
>
>we could simply write things like:
>
>MyConcept hasProperty Property  (with multiple cardinality, this
>would cover all the above: no need to predefine all possible cases)
>
>  and if we need to be more precise (restrict allowed properties):
>
>MyConcept hasProperty (Class with superclass Contact or How or What)
>
>  Anyone experienced could tell if my own view is really really
>wrong? Or incompatible with the way description logics and reasonners
>work? I hope this could make our lives easier when we stop playing
>with toy-ontologies and go into the big ones.
>
>Sebastien.
>  
>

From owner-semantics@eso.org  Thu Jun  2 16:39:16 2005
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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: "Semantics" <semantics@ivoa.net>
Subject: FW: [Ontology] UCDs vs ontologies?
Date: Thu, 2 Jun 2005 15:36:51 +0100
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[forwarded from dm to semantics]

Elizabeth Auden wrote:
> 
> Incidentally, I've posted a first go at a VOEvent ontology (OWL-DL 
> format) on the VOTech wiki at 
> http://wiki.eurovotech.org/bin/view/VOTech/VoEventOntology. Any 
> comments on the structure, concepts, and coverage of this v0.000000001 
> ontology would be appreciated.

  Hi,

  Reading the questions you list in the above page, I have a comment on
points 2 and 3.
  When trying to build small ontologies, I found (and still do find)
extremely stupid to be "forced" to define one slot dedicated to each class
to indicate "hasSomething".
  In your example, Contact / hasContact , How / hasHow, What / hasWhat, ...
I found this (and this is the case in every example I could find) awful.

  I wish we could define something where we don't have to be omniscients
when building the ontology, but where the ability to make reasonning would
not be lost. Something like:
  - Having a class named Property
  - Having classes Contact, How, What, ... being subclasses of Property
(these classes might have many superclasses)
  - Having a unique slot "hasProperty" with a value being a Class, with the
allowed class "Property" (thus also allowing Property's subclasses)

  That way, instead of having to define zillions of slots (i.e. at least one
per new subclass of Property) and writing:

MyConcept hasContact Contact
MyConcept hasHow How
MyConcept hasWhat What
... and as many as there are different possible properties

we could simply write things like:

MyConcept hasProperty Property  (with multiple cardinality, this would cover
all the above: no need to predefine all possible cases)

  and if we need to be more precise (restrict allowed properties):

MyConcept hasProperty (Class with superclass Contact or How or What)

  Anyone experienced could tell if my own view is really really wrong? Or
incompatible with the way description logics and reasonners work? I hope
this could make our lives easier when we stop playing with toy-ontologies
and go into the big ones.

Sebastien.
-- 
    _______
   /  ~   /, Sebastien Derriere   mailto:derriere@astro.u-strasbg.fr
  / ~~~~ //  Observatoire de Strasbourg    Phone +33 (0) 390 242 444
 /______//   11, rue de l'universite     Telefax +33 (0) 390 242 417
(______(/    F-67000 Strasbourg  France

From owner-semantics@eso.org  Thu Jun  2 16:39:30 2005
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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: "Semantics" <semantics@ivoa.net>
Subject: FW: [Ontology] UCDs vs ontologies?
Date: Thu, 2 Jun 2005 15:37:09 +0100
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[forwarded from dm to semantics]

Hi Sebastien,

> That way, instead of having to define zillions of slots (i.e. at least 
> one per new subclass of Property) and writing:
>
> MyConcept hasContact Contact
> MyConcept hasHow How
> MyConcept hasWhat What
> ... and as many as there are different possible properties
>
> we could simply write things like:
>
> MyConcept hasProperty Property  (with multiple cardinality, this would 
> cover all the above: no need to predefine all possible cases)

This is in line with something I read when I first started looking into
ontologies a few years ago, that one way of doing things is to have <10
properties of the generic "has a", "is a" variety.

However, since then I've also read that providing more specific properties
can also reduce confusion if the property has a human-readable /
understandable name. If someone sees that class "Cow" has property
"hasLegs", then you can write Cow hasLegs Legs (4), whereas if "Cow" had
"hasProperty", then you could end up with Cow hasProperty Beak.

Of course, if the ontology goes the first route of having only a few generic
properties, then one only has to be omnicient for each class, so
"hasProperty" could be restricted to "value", "unit", "WhereWhen" or "Legs"
for any given class.

So: many properties or few properties? I could try out two different
versions while the VOEvent ontology is still quite small and see what people
think.

Elizabeth

From owner-semantics@eso.org  Thu Jun  2 16:51:33 2005
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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: "'Ed Shaya'" <edward.j.shaya.1@gsfc.nasa.gov>
Cc: <semantics@ivoa.net>
Subject: RE: [Ontology] UCDs vs ontologies?
Date: Thu, 2 Jun 2005 15:51:07 +0100
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Semantics, ontologies and the like could usefully be claimed by the UCD, DM
or Registry workgroups (and I daresay others if they put their minds to it
:) ).

The Semantics IG is the right place within the IVOA lists for discussions
about this area of *interest*. 

If there are specific standards that need to be developed, we will raise
them with the appropriate workgroup, or, if no such workgroup exists, with
the exec with a view to creating a new workgroup.

Cheers,
Tony. 

> -----Original Message-----
> From: owner-semantics@eso.org 
> [mailto:owner-semantics@eso.org] On Behalf Of Ed Shaya
> Sent: 02 June 2005 15:34
> Cc: dm@ivoa.net; semantics@ivoa.net
> Subject: Re: [Ontology] UCDs vs ontologies?
> 
> Are these discussions going to be on dm or semantics?  We had 
> better decide fast.  I had spoken with Jonathan just a few 
> days ago and he felt this logically belonged inside of dm.  I 
> agreed with him because Ontology should be a basic component 
> (an early stage) of data modeling.  
> But then Tony Linde reminded me that there already is a 
> semantics site and that is where it belongs.  That makes 
> sense too.  What do others think?
> 
> Ed
> 
> 
> 
> Sebastien Derriere wrote:
> 
> >[posted to dm only to avoid cross-posting]
> >
> >Elizabeth Auden wrote:
> >  
> >
> >>Incidentally, I've posted a first go at a VOEvent ontology (OWL-DL 
> >>format) on the VOTech wiki at 
> >>http://wiki.eurovotech.org/bin/view/VOTech/VoEventOntology. Any 
> >>comments on the structure, concepts, and coverage of this 
> v0.000000001 
> >>ontology would be appreciated.
> >>    
> >>
> >
> >  Hi,
> >
> >  Reading the questions you list in the above page, I have a 
> comment on 
> >points 2 and 3.
> >  When trying to build small ontologies, I found (and still do find) 
> >extremely stupid to be "forced" to define one slot dedicated to each 
> >class to indicate "hasSomething".
> >  In your example, Contact / hasContact , How / hasHow, What 
> / hasWhat, 
> >....
> >I found this (and this is the case in every example I could 
> find) awful.
> >
> >  I wish we could define something where we don't have to be 
> >omniscients when building the ontology, but where the 
> ability to make 
> >reasonning would not be lost. Something like:
> >  - Having a class named Property
> >  - Having classes Contact, How, What, ... being subclasses 
> of Property 
> >(these classes might have many superclasses)
> >  - Having a unique slot "hasProperty" with a value being a 
> Class, with 
> >the allowed class "Property" (thus also allowing Property's 
> subclasses)
> >
> >  That way, instead of having to define zillions of slots (i.e. at 
> >least one per new subclass of Property) and writing:
> >
> >MyConcept hasContact Contact
> >MyConcept hasHow How
> >MyConcept hasWhat What
> >.... and as many as there are different possible properties
> >
> >we could simply write things like:
> >
> >MyConcept hasProperty Property  (with multiple cardinality, 
> this would 
> >cover all the above: no need to predefine all possible cases)
> >
> >  and if we need to be more precise (restrict allowed properties):
> >
> >MyConcept hasProperty (Class with superclass Contact or How or What)
> >
> >  Anyone experienced could tell if my own view is really 
> really wrong? 
> >Or incompatible with the way description logics and 
> reasonners work? I 
> >hope this could make our lives easier when we stop playing with 
> >toy-ontologies and go into the big ones.
> >
> >Sebastien.
> >  
> >
> 
> 

From owner-semantics@eso.org  Thu Jun  2 17:35:20 2005
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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: "'Semantics'" <semantics@ivoa.net>
Subject: RE: Semantics IG charter
Date: Thu, 2 Jun 2005 16:34:56 +0100
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Okay, so far I've been asked 'why do we need one?' and 'what is a charter?'.

To answer the first, because it is in the rules of the IVOA, and the second,
check out the following two:

  http://www.ivoa.net/twiki/bin/view/IVOA/IvoaApplications#Charter
  http://www.ivoa.net/twiki/bin/view/IVOA/IvoaTheory#Charter

So, looks like we need about 5-8 bullet points describing what this IG is
about: ideas?

I've also created a starter wiki page for storing docs related to this
effort:
  http://www.ivoa.net/twiki/bin/viewauth/IVOA/IvoaSemantics
(unashamedly ripped-off from Gerard's Theory one, so excuse any bits left in
there)

Cheers,
Tony. 

> -----Original Message-----
> From: owner-semantics@eso.org 
> [mailto:owner-semantics@eso.org] On Behalf Of Tony Linde
> Sent: 02 June 2005 11:56
> To: Semantics
> Subject: Semantics IG charter
> 
> I've been asked by the IVOA Exec to prepare a charter for the 
> Semantics IG since it seems to have woken up again (and if we 
> keep feeding it regular stimulants, maybe it'll stay awake this time).
> 
> Can I ask for a couple of volunteers to help me knock up a 
> charter that can be posted to this list for comment and 
> amendment and then to the Exec for approval?
> 
> Thanks,
> Tony. 
> 
> --
> Tony Linde
> Phone:  +44 (0)116 223 1292      Mobile: +44 (0)7753 603356
> Fax:    +44 (0)116 252 3311      Email:  Tony.Linde@leicester.ac.uk
> Skype:  callto:tonylinde (home)  callto:tonylinde2 (work)
> Post:   Department of Physics & Astronomy, University of Leicester
>         Leicester, UK   LE1 7RH
> Web:    http://www.star.le.ac.uk/~ael
>             
> Project Manager, EuroVO VOTech   http://eurovotech.org 
> Programme Manager, AstroGrid     http://www.astrogrid.org 
> Co-Director,
>  Leicester e-Science Centre      http://www.e-science.le.ac.uk/ 
> 
> 

From owner-semantics@eso.org  Thu Jun  2 17:41:00 2005
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Subject: Re: Semantics IG charter
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On Jun 2, 2005, at 3:56 AM, Tony Linde wrote:

> I've been asked by the IVOA Exec to prepare a charter for the 
> Semantics IG

Tony
I think the idea is that Semantics is the new name for UCD.

Throughout the VO effort, we have been trying to identify "knowledge 
engineering" tools that can be useful and implementable. The only such 
effort that has really taken off has been the UCD effort. I would 
suggest that Semantics and UCD be merged, with the idea that one half 
is the reality of UCD and the other half is the research area of 
ontologies etc.

Roy

From owner-semantics@eso.org  Thu Jun  2 17:45:16 2005
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From: Elizabeth Auden <eca@mssl.ucl.ac.uk>
To: "'Semantics'" <semantics@ivoa.net>
Subject: RE: Semantics IG charter
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> So, looks like we need about 5-8 bullet points describing what this IG is
> about: ideas?

A few starters:

* discuss development of ontologies relating to IVOA schemas
* discuss integration of individual ontologies into an overall "space 
ontology"
* discuss uses and roles for ontologies in a VO context

cheers,
Elizabeth

From owner-semantics@eso.org  Thu Jun  2 17:51:00 2005
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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: "'Roy Williams'" <roy@cacr.caltech.edu>
Cc: "'Semantics'" <semantics@ivoa.net>
Subject: RE: Semantics IG charter
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Hi Roy,

I think you've highlighted the exact reason why we need an Interest Group
separate from the UCD, DM and Registry Work Groups. 

Also, DM think it belongs to them. So, do we fold the UCD group and put it
into the DM group? And since the Registry will *realise* data models,
whether based on ontologies or not, we should move them all under that!
Where do you stop?

Let's keep the IGs for discussion and conceptual work and the WGs for
implementation.

Cheers,
Tony. 

> -----Original Message-----
> From: Roy Williams [mailto:roy@cacr.caltech.edu] 
> Sent: 02 June 2005 16:40
> To: Tony Linde
> Cc: Roy Williams; Semantics
> Subject: Re: Semantics IG charter
> 
> 
> On Jun 2, 2005, at 3:56 AM, Tony Linde wrote:
> 
> > I've been asked by the IVOA Exec to prepare a charter for the 
> > Semantics IG
> 
> Tony
> I think the idea is that Semantics is the new name for UCD.
> 
> Throughout the VO effort, we have been trying to identify 
> "knowledge engineering" tools that can be useful and 
> implementable. The only such effort that has really taken off 
> has been the UCD effort. I would suggest that Semantics and 
> UCD be merged, with the idea that one half is the reality of 
> UCD and the other half is the research area of ontologies etc.
> 
> Roy
> 
> 

From owner-semantics@eso.org  Thu Jun  2 19:01:54 2005
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To: <semantics@ivoa.net>
Subject: RE: Semantics IG charter
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How about:

 * provide a forum for cross-workgroup discussions in the fields of semantic
naming, semantic modelling, semantic querying and the like
    * and to assist in transitioning these ideas into IVOA workgroups
 * take ideas from semantic web, semantic grid and other fields and
determine if they apply to the international Vobs

T.

> -----Original Message-----
> From: owner-semantics@eso.org 
> [mailto:owner-semantics@eso.org] On Behalf Of Elizabeth Auden
> Sent: 02 June 2005 16:45
> To: 'Semantics'
> Subject: RE: Semantics IG charter
> 
> > So, looks like we need about 5-8 bullet points describing 
> what this IG 
> > is
> > about: ideas?
> 
> A few starters:
> 
> * discuss development of ontologies relating to IVOA schemas
> * discuss integration of individual ontologies into an 
> overall "space ontology"
> * discuss uses and roles for ontologies in a VO context
> 
> cheers,
> Elizabeth
> 

From owner-semantics@eso.org  Thu Jun  2 19:08:25 2005
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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: <semantics@ivoa.net>
Subject: Carry on here for now...
Date: Thu, 2 Jun 2005 18:07:55 +0100
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Hi all. I didn't realise I was going to provoke such a storm by offering to
coordinate what seemed to be a newly arisen piece of work. It seems that
both the UCD workgroup and the DM workgroup want to 'own' semantics, while
I've suggested that we need an Interest Group separate from the existing
Work Groups simply as a talking place.

Anyway, I've suggested that the Exec sort it out at its next telecon while
we get on with defining a charter, roadmap and possible actions. At least,
then, if the exec want to put this topic under an existing workgroup,
they'll have some work already to get started with.

Does that sound okay to everyone else as a way forward? Are you happy to
post here until the exec sort out a final home for the work?

Cheers,
Tony. 

-- 
Tony Linde
Phone:  +44 (0)116 223 1292      Mobile: +44 (0)7753 603356
Fax:    +44 (0)116 252 3311      Email:  Tony.Linde@leicester.ac.uk
Skype:  callto:tonylinde (home)  callto:tonylinde2 (work)
Post:   Department of Physics & Astronomy, University of Leicester
        Leicester, UK   LE1 7RH
Web:    http://www.star.le.ac.uk/~ael
            
Project Manager, EuroVO VOTech   http://eurovotech.org 
Programme Manager, AstroGrid     http://www.astrogrid.org 
Co-Director,
 Leicester e-Science Centre      http://www.e-science.le.ac.uk/ 

From owner-semantics@eso.org  Thu Jun  2 19:12:46 2005
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From: "Bernard Vatant" <bernard.vatant@mondeca.com>
To: "Semantics" <semantics@ivoa.net>
Subject: Defining a generic "hasProperty" property ? RE: [Ontology] UCDs vs ontologies?
Date: Thu, 2 Jun 2005 19:12:07 +0200
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Bonjour Sebastien

> When trying to build small ontologies, I found (and still do find)
> extremely stupid to be "forced" to define one slot dedicated to each class
> to indicate "hasSomething".
> In your example, Contact / hasContact , How / hasHow, What / hasWhat, ...
> I found this (and this is the case in every example I could find) awful.

What is really awful is the lack of vocabulary :)
Actually all the point of Object Properties is to make distinct the Class which is the
Property Range (e.g. Contact) from the Property itself (e.g. hasContact). Maybe there it's
the definition of the "hasContact" Range which has to be revisited. Should be perhaps
"Organization", or "Actor", or "Person" ... whatever, in any case a Class of which
definition is independent of the fact that it is the Range of "hasContact". IOW, a sound
ontology should always try and make distinct for any entity the so-called "rigid" or
"essential" properties, and the ones inherited from its relations with other entities
(otherwise called roles). If a class is created "ad hoc" just as the range of some
property, it generally means that something sucks in the model ...

> I wish we could define something where we don't have to be omniscients
> when building the ontology, but where the ability to make reasonning would
> not be lost. Something like:
>   - Having a class named Property
>   - Having classes Contact, How, What, ... being subclasses of Property
> (these classes might have many superclasses)

Hmmm ... "le degre zero de la semantique" ?? :))
In any case, I won't name this Class "Property". Since, if I catch well your point, just
*anything* can be instance of this class, well, there is a built-in class for that in OWL.
It's owl:Thing

>  - Having a unique slot "hasProperty" with a value being a Class, with the
> allowed class "Property" (thus also allowing Property's subclasses)

I'm not sure what you mean by "with a value being a Class". The "Property" class below is
a regular owl:Class, right, not a meta-class? Or is it?

>   That way, instead of having to define zillions of slots (i.e. at least one
> per new subclass of Property) and writing:
>
> MyConcept hasContact Contact
> MyConcept hasHow How
> MyConcept hasWhat What
> ... and as many as there are different possible properties
>
> we could simply write things like:
>
> MyConcept hasProperty Property  (with multiple cardinality, this would cover
> all the above: no need to predefine all possible cases)
>   and if we need to be more precise (restrict allowed properties):
>
> MyConcept hasProperty (Class with superclass Contact or How or What)

I wonder if you are not mixing up two levels of representation. When you write

"MyConcept  hasProperty  foo"

Do you mean that "foo" is a specific value of hasProperty or is it its Range?

IOW, do you mean the above as a strict RDF triple (in this case Property is actually a
meta-class, of which foo is an instance). And BTW your ontology is no more DL.

... or do you mean rather the declaration of a Restriction
For any instance of "MyConcept" , "hasProperty" values are instances of "foo"

<owl:Class rdf:about="MyConcept">
  <rdfs:subClassOf>
    <owl:Restriction>
      <owl:onProperty rdf:resource="http://www.ivoa.net/ontology#hasProperty"/>
      <owl:allValuesFrom rdf:about="#Foo"/>
    </owl:Restriction>
  </rdfs:subClassOf>
</owl:Class>

> Anyone experienced could tell if my own view is really really wrong?

This is engineering, right - unless you claim to catch "The True Ontology of the Real
World" - but hopefully there are not too many such true believers left among astronomers -
so there is nothing "right" or "wrong", only stuff that works, and stuff that don't ...

In that case, I'm afraid this approach is really too lazy, and think about performance of
queries on VERY LARGE DATA BASES. You got one in Strasbourg, I've heard (I'm even in
there, go figure! http://cdsweb.u-strasbg.fr/ftp/cats/afoev/observer). What kind of
queries will you write using "hasProperty", and how many answers will you have to process
to find out all instances of "Contact" for any "VOEvent" about "SN 2005cf". Remember if
you use a generic property, you will have to filter answers by their class - but the query
will find them first, right?

> Or incompatible with the way description logics and reasonners work? I hope
> this could make our lives easier when we stop playing with toy-ontologies
> and go into the big ones.

Sure. So you don't have to be lazy on modeling and look at the queries it will support ...

Bernard

**********************************************************************************

Bernard Vatant
Senior Consultant
Knowledge Engineering
bernard.vatant@mondeca.com

"Making Sense of Content" :  http://www.mondeca.com
"Everything is a Subject" :  http://universimmedia.blogspot.com

**********************************************************************************


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For European (and rich American) participants...

Conference details at:
  http://protege.stanford.edu/conference/2005/

So far, AFAIK, Sebastien, Elizabeth and I will be going. Hey, with enough
people, we could get up an IVOA sub-group :)
(Just don't ask me to organise it!!!)

As it says below, tomorrow is last day for low-cost registration.

Cheers,
Tony. 

-----Original Message-----
From: protege-users-bounce@crg-gw.Stanford.EDU
[mailto:protege-users-bounce@crg-gw.Stanford.EDU] On Behalf Of Jennifer
Vendetti
Sent: 31 May 2005 20:46
To: protege-users@SMI.Stanford.EDU
Subject: [protege-users] 2005 Protege Conference: Early Registration
Deadline Fast Approaching !!


Protege Users,

Please note that the early registration deadline for the Protege Conference
is this Friday, June 3rd.  After June 3rd, the price for registration will
go from $475.00 to $700.00.  We encourage those of you who have not yet
registered but plan to attend the conference to register as soon as
possible.

Looking forward to seeing you in July!

The Protege Team



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From owner-semantics@eso.org  Thu Jun  2 21:45:59 2005
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Cc: Roy Williams <roy@cacr.caltech.edu>
Subject: some semantic puzzles from VOEvent
From: Roy Williams <roy@cacr.caltech.edu>
Date: Thu, 2 Jun 2005 12:45:26 -0700
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Here are some projects and use cases that are of interest to me and the 
VOEvent group, that may be relevant to the Semantics IG.
Roy
-----------------

(1) Adding an interpretation to a VOEvent. In the VOEvent schema, we 
have a "Why" section where the publisher can say  what they think the 
event is (supernova or an outburst of a variable star or a microlensing 
event or GRB etc etc).  We would like a formal vocabulary so that, for 
example, the computer can understand that "Supernova" and "SN" are the 
same thing. However, my simple attempts to do this as a new branch of 
the UCD tree blew up into a storm of controversy. How can we make 
progress here?

(2) Suppose we have a collection of Event observation packets that are 
all about single astrophysical event, but made by different people from 
different telescopes. How can I look at the interpretations ("Why" 
sections) and decide if there is a difference of opinion, or a change 
in interpretation with time? One report says the Event is a Supernova, 
another says it is a SupernovaType1a, another says it is a SN and 
another says "bright source associated with a galaxy". Are these four 
in agreement?

(3) In VOEvent, there is a section for saying what was measured, and it 
is a collection of parameters that are characterized by UCD. For 
example PEAK_COUNT=3243 and R-MAG=17.5 and BANANA_FLUX=4.654. If I have 
a lot of  VOEvent packets that refer to the same astrophysical event,  
can I extract a SED or light-curve (or time-dependent SED) by 
federating all the separate observations?


California Institute of Technology
626 395 3670
--Apple-Mail-20--152110460
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Content-Type: text/enriched;
	charset=US-ASCII

Here are some projects and use cases that are of interest to me and
the VOEvent group, that may be relevant to the Semantics IG.

Roy

-----------------


(1) Adding an interpretation to a VOEvent. In the VOEvent schema, we
have a "Why" section where the publisher can say  what they think the
event is (supernova or an outburst of a variable star or a
microlensing event or GRB etc etc).  We would like a formal vocabulary
so that, for example, the computer can understand that "Supernova" and
"SN" are the same thing. However, my simple attempts to do this as a
new branch of the UCD tree blew up into a storm of controversy. How
can we make progress here?


(2) Suppose we have a collection of Event observation packets that are
all about single astrophysical event, but made by different people
from different telescopes. How can I look at the interpretations
("Why" sections) and decide if there is a difference of opinion, or a
change in interpretation with time? One report says the Event is a
Supernova, another says it is a SupernovaType1a, another says it is a
SN and another says "bright source associated with a galaxy". Are
these four in agreement?


(3) In VOEvent, there is a section for saying what was measured, and
it is a collection of parameters that are characterized by UCD. For
example PEAK_COUNT=3243 and R-MAG=17.5 and BANANA_FLUX=4.654. If I
have a lot of  VOEvent packets that refer to the same astrophysical
event,  can I extract a SED or light-curve (or time-dependent SED) by
federating all the separate observations?



<fontfamily><param>Helvetica</param><smaller><smaller>California
Institute of Technology

626 395 3670</smaller></smaller></fontfamily>
--Apple-Mail-20--152110460--

From owner-semantics@eso.org  Thu Jun  2 22:45:57 2005
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From: Brian Thomas <thomas@astro.umd.edu>
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To: semantics@ivoa.net, dm@ivoa.net
Subject: Quantity in SED, VOEvent (Was: Re: some semantic puzzles from VOEvent
Date: Thu, 2 Jun 2005 16:44:54 -0400
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On Thursday 02 June 2005 03:45 pm, Roy Williams wrote:
> (3) In VOEvent, there is a section for saying what was measured, and it 
> is a collection of parameters that are characterized by UCD. For 
> example PEAK_COUNT=3243 and R-MAG=17.5 and BANANA_FLUX=4.654. If I have 
> a lot of Â VOEvent packets that refer to the same astrophysical event, Â 
> can I extract a SED or light-curve (or time-dependent SED) by 
> federating all the separate observations?
> 

	Roy,

	As was pointed out at the NVO Team meeting in April, this section of
	VOEvent should be captured as quantity(s). This, in tandem with adoption
	of quantities in the measured phenomena portion of the SED model, would
	make what you desire happen more or less seamlessly. I have a quantity-based
	SED model sitting about here somewheres.. from what I recall its not terribly
	different looking than the current non-q sed one.

	=brian

ps cross-posted only because this went to 'semantics' first. Please continue on dm list, 
if desired.

-- 
--------------------------------------
|                                     
| Dr. Brian Thomas                    
|                                     
| Dept of Astronomy                   
| University of Maryland-College Park 
|
| Phone: (301) 405-2312               
| Fax: (301) 314-9067                 
|                                     
--------------------------------------

From owner-dm@eso.org  Thu Jun  2 22:46:08 2005
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From: Brian Thomas <thomas@astro.umd.edu>
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To: semantics@ivoa.net, dm@ivoa.net
Subject: Quantity in SED, VOEvent (Was: Re: some semantic puzzles from VOEvent
Date: Thu, 2 Jun 2005 16:44:54 -0400
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On Thursday 02 June 2005 03:45 pm, Roy Williams wrote:
> (3) In VOEvent, there is a section for saying what was measured, and it 
> is a collection of parameters that are characterized by UCD. For 
> example PEAK_COUNT=3243 and R-MAG=17.5 and BANANA_FLUX=4.654. If I have 
> a lot of Â VOEvent packets that refer to the same astrophysical event, Â 
> can I extract a SED or light-curve (or time-dependent SED) by 
> federating all the separate observations?
> 

	Roy,

	As was pointed out at the NVO Team meeting in April, this section of
	VOEvent should be captured as quantity(s). This, in tandem with adoption
	of quantities in the measured phenomena portion of the SED model, would
	make what you desire happen more or less seamlessly. I have a quantity-based
	SED model sitting about here somewheres.. from what I recall its not terribly
	different looking than the current non-q sed one.

	=brian

ps cross-posted only because this went to 'semantics' first. Please continue on dm list, 
if desired.

-- 
--------------------------------------
|                                     
| Dr. Brian Thomas                    
|                                     
| Dept of Astronomy                   
| University of Maryland-College Park 
|
| Phone: (301) 405-2312               
| Fax: (301) 314-9067                 
|                                     
--------------------------------------

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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: "VOTech-ResourceDiscovery" <ds5@eurovotech.org>, <semantics@ivoa.net>
Subject: FW: [protege-users] 2005 Protege Conference: Early Registration & Hotel Information
Date: Thu, 2 Jun 2005 22:00:01 +0100
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 largely a repeat of previous email, but new info about hotel...

-----Original Message-----
From: protege-users-bounce@crg-gw.Stanford.EDU
[mailto:protege-users-bounce@crg-gw.Stanford.EDU] On Behalf Of Jennifer
Vendetti
Sent: 02 June 2005 17:55
To: protege-users@SMI.Stanford.EDU
Subject: [protege-users] 2005 Protege Conference: Early Registration & Hotel
Information


Protege Users,

Please note that tomorrow (Friday, June 3rd) is the deadline for early
registration.  After Friday, registration fees will increase from $450.00 to
$700.00 for regular registrants and from $200.00 to $400.00 for student
registrants.  Online registration is available on the conference Web site:

http://protege.stanford.edu/conference/2005/register.html

Also, Monday, June 6th is the last day to book a room from the blocks of
rooms reserved for the Protege Conference at hotels Husa Princesa and Husa
Moncloa.  After June 6th, the blocks of rooms will be opened up to the
public and the special conference rates will no longer be available.  More
information about both hotels is available on the conference Web site:

http://protege.stanford.edu/conference/2005/hotels.html


Looking forward to seeing you in July!

The Protege Team



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From owner-semantics@eso.org  Thu Jun  2 23:10:29 2005
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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: <semantics@ivoa.net>
Subject: Capturing conflicting classifications + Annotations
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An area of work which I think needs to be captured and in which
semantic-ish-ness might help, is that of capturing and making available
conflicting information.

So, if we have a source of some sort, one person classifies it as a star and
another as a galaxy. How do we capture that in an ontology? Can the
classifications be rated?

Is there a more general topic here of annotating items in an ontology? Can
we overlay an ontology so that specialised interpretations or annotations
look like they are part of some full ontology? So, if a query is created
with a 'namespace' of AstroOntology+RoyWilliams, then querying on 'galaxies'
will include sources classified differently by RoyWilliams from everyone
else in astronomy.

Cheers,
Tony. 

-- 
Tony Linde
Phone:  +44 (0)116 223 1292      Mobile: +44 (0)7753 603356
Fax:    +44 (0)116 252 3311      Email:  Tony.Linde@leicester.ac.uk
Skype:  callto:tonylinde (home)  callto:tonylinde2 (work)
Post:   Department of Physics & Astronomy, University of Leicester
        Leicester, UK   LE1 7RH
Web:    http://www.star.le.ac.uk/~ael
            
Project Manager, EuroVO VOTech   http://eurovotech.org 
Programme Manager, AstroGrid     http://www.astrogrid.org 
Co-Director,
 Leicester e-Science Centre      http://www.e-science.le.ac.uk/ 

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Date: Fri, 03 Jun 2005 09:34:22 +0200
From: Sebastien Derriere <derriere@newb6.u-strasbg.fr>
Organization: Observatoire de Strasbourg
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Tony Linde wrote:
> 
> Also, Monday, June 6th is the last day to book a room from the blocks of
> rooms reserved for the Protege Conference at hotels Husa Princesa and Husa
> Moncloa.  After June 6th, the blocks of rooms will be opened up to the
> public and the special conference rates will no longer be available.  More
> information about both hotels is available on the conference Web site:
> 
> http://protege.stanford.edu/conference/2005/hotels.html

  FYI, I found that the "conference special rate" is not really 
interesting. Using the regular web pages of the hotel, you can 
find e.g. rooms for 119 euros (conference rate is 159 euro)
at Hotel Husa Princesa.

Sebastien.
-- 
    _______
   /  ~   /, Sebastien Derriere   mailto:derriere@astro.u-strasbg.fr
  / ~~~~ //  Observatoire de Strasbourg    Phone +33 (0) 390 242 444
 /______//   11, rue de l'universite     Telefax +33 (0) 390 242 417
(______(/    F-67000 Strasbourg  France

From owner-semantics@eso.org  Fri Jun  3 10:46:19 2005
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From: "Bernard Vatant" <bernard.vatant@mondeca.com>
To: <semantics@ivoa.net>
Subject: RE: some semantic puzzles from VOEvent
Date: Fri, 3 Jun 2005 10:45:42 +0200
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Some suggestions of tracks to answer Roy's puzzles ...

(1) Adding an interpretation to a VOEvent. In the VOEvent schema, we have a "Why" section
where the publisher can say what they think the event is (supernova or an outburst of a
variable star or a microlensing event or GRB etc etc). We would like a formal vocabulary
so that, for example, the computer can understand that "Supernova" and "SN" are the same
thing. However, my simple attempts to do this as a new branch of the UCD tree blew up into
a storm of controversy. How can we make progress here?

BV : Preliminary question : I've mined the whole IVOA website looking for VOEvent schema,
but could not find it. Is it available somewhere? Even as a draft?
Seems to me that a science ontology should always make distinct the representation of the
*experimental data* (which if I get it right, are what VOEvent(s) are about), and
*interpretations* of those data. The word "event" is overloaded here, since it seems to
encapsulate both, hence the difficulty, frequent in science. Although everyone involved in
experimental science is aware (or should be) in theory of this distinction, in practice
it's often forgotten when there is global implicit agreement on interpretation. When I say
: "This is an infrared image of the planet Jupiter" I somehow forget the distinction. I
should say : "This is the result of a process in which X have gathered bytes using such
telescope, CCD, software ... and that Y interprets as being an image in IR of the planet
Jupiter". But nobody would do that in that case, because everybody knows (or thinks so) or
at least implicitly agrees upon what Jupiter *is* and looks like, what a planet *is*, and
so on. There is a unique (implicit) interpretation in the common (implicit) ontology. Of
course, this breaks for SN or GRB, where the question of interpretation is critical. I've
an old Web Page about that issue [1].

If one wants to clarify and formalize, this distinction has to be captured in the
ontology. The way I see it, roughly and non-exhaustive, and independently of specific data
or even scientific domain (this applies also in Biology, Earth Sciences, whatever). An
"Event" is composed of one "Fact" and one or more "Interpretation(s)". When I say "Fact",
read "experimental fact".

Components of Fact
	What : Data Set (including values, units etc ...)
	When - Where : Space-Time location of the experiment
	How : Tools (Method, Instrument, Protocol ...)
	Who : Actor in the Fact (observer, data curator ...)
	Related Facts : Previous, Follow-up
	Framework : Research Program ...
	Why : Purpose of the event (why the data have been gathered for, hypothesis, whatever)
	...

Components of Interpretation
	Science Object : The thing(s) data are about, and their type
	Model (this is more tricky : includes theoretical framework, world model, ...)
	Who : Who makes the interpretation
	Publication : Various material documenting the interpretation
	Support : Other facts and interpretations contributing to the interpretation
	Similar : Other facts interpreted as being about the same object
	...

I would be happy to propose a more formal description of all that in a OWL format if folks
are interested to review it.

(2) Suppose we have a collection of Event observation packets *that are all about single
astrophysical event*, but made by different people from different telescopes. How can I
look at the interpretations ("Why" sections) and decide if there is a difference of
opinion, or a change in interpretation with time? One report says the Event is a
Supernova, another says it is a SupernovaType1a, another says it is a SN and another says
"bright source associated with a galaxy". Are these four in agreement?

BV : I've underlined *that are all about single astrophysical event*. Think about the
meaning of this sentence at the light of the above distinction. You have different
experimental facts, interpreted as being about the same object. Observer X has taken an
image later interpreted as being a SN 1c in NGC 4038. Other, looking to the same sky
coordinates, have obtained other data that they interpret as being images of the "same"
object in the "same" galaxy (whatever this "sameness" actually means ...). The "object" is
named 2004gt. Looking at some description :
http://www.rochesterastronomy.org/supernova.html#2004gt ... the distinction between the
fact and the interpretation is far from obvious.

Now to answer directly your question about agreement, seems to me that there are three
levels of agreement:
1. Agreement about speaking of the same fact(s) - same observation(s)
2. Agreements about interpretation :
	2.a : Agreement on "sameness" of object across different observations
	2.b : Agreement on type of this object
For all those, all the point is to explicitly identify the subject of conversation.
Agreement between SN and SN 1c interpretations can be inferred if the ontology of objects
declares that SN 1C is a subclass of SN.

(3) In VOEvent, there is a section for saying what was measured, and it is a collection of
parameters that are characterized by UCD. For example PEAK_COUNT=3243 and R-MAG=17.5 and
BANANA_FLUX=4.654. If I have a lot of VOEvent packets that refer to the same astrophysical
event, can I extract a SED or light-curve (or time-dependent SED) by federating all the
separate observations?

BV: The answer is "yes" if the "what was measured" refers to an interpretation with
agreement on 2.a (in terms of object sameness). When I extract a light-curve I am in the
framework of interpretation. I mean there is no light-curve that is a fact, unless it's
directly captured by a single instrument, protocol ... As long as you put together data
from different sources, the agreement about those data being about the same thing supposes
an (there again, most of the time implicit) agreement on a world model where this object
is supposed to "exist".

This seems somehow independent of any agreement on 2.b (type of the object) although it's
not obvious that there can be any agreement on the sameness of an object if there is
disagreement on its type. From a formal viewpoint, suppose you have declared in the
ontology that SN 1a and SN 1c are disjoint subclasses of SN, if interpretation X says that
E is instance of SN 1a and interpretation Y says that E is instance of SN 1b, but agree
that E is the same object (same object identification), I can infer that X and Y are
inconsistent (read : disagree).

Hope that is helpful, and not adding to confusion :))

[1] http://perso.wanadoo.fr/universimmedia/subjects.htm

**********************************************************************************

Bernard Vatant
Senior Consultant
Knowledge Engineering
bernard.vatant@mondeca.com

"Making Sense of Content" :  http://www.mondeca.com
"Everything is a Subject" :  http://universimmedia.blogspot.com

**********************************************************************************



From owner-semantics@eso.org  Fri Jun  3 10:59:35 2005
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From: "Bernard Vatant" <bernard.vatant@mondeca.com>
To: <semantics@ivoa.net>
Subject: RE: Capturing conflicting classifications + Annotations
Date: Fri, 3 Jun 2005 10:59:05 +0200
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Tony

See my previous answer to Roy, where there might be clues about your first question at
least. As long as you make fact and interpretation distinct objects, there is no problem
in qualifying the interpretation by any appropriate attribute (author, date, asserted
quality). You can easily formally define approval, refutation, whatever, like :

"X is an interpretation of E by Roy"
"Tony says that X is *** (whatever you want to qualify it)"

Bernard

> -----Message d'origine-----
> De : owner-semantics@eso.org [mailto:owner-semantics@eso.org]De la part
> de Tony Linde
> Envoye : jeudi 2 juin 2005 23:10
> A : semantics@ivoa.net
> Objet : Capturing conflicting classifications + Annotations
>
>
> An area of work which I think needs to be captured and in which
> semantic-ish-ness might help, is that of capturing and making available
> conflicting information.
>
> So, if we have a source of some sort, one person classifies it as a star and
> another as a galaxy. How do we capture that in an ontology? Can the
> classifications be rated?
>
> Is there a more general topic here of annotating items in an ontology? Can
> we overlay an ontology so that specialised interpretations or annotations
> look like they are part of some full ontology? So, if a query is created
> with a 'namespace' of AstroOntology+RoyWilliams, then querying on 'galaxies'
> will include sources classified differently by RoyWilliams from everyone
> else in astronomy.
>
> Cheers,
> Tony.
>
> --
> Tony Linde
> Phone:  +44 (0)116 223 1292      Mobile: +44 (0)7753 603356
> Fax:    +44 (0)116 252 3311      Email:  Tony.Linde@leicester.ac.uk
> Skype:  callto:tonylinde (home)  callto:tonylinde2 (work)
> Post:   Department of Physics & Astronomy, University of Leicester
>         Leicester, UK   LE1 7RH
> Web:    http://www.star.le.ac.uk/~ael
>
> Project Manager, EuroVO VOTech   http://eurovotech.org
> Programme Manager, AstroGrid     http://www.astrogrid.org
> Co-Director,
>  Leicester e-Science Centre      http://www.e-science.le.ac.uk/
>


From owner-semantics@eso.org  Fri Jun  3 15:00:45 2005
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From: "Bernard Vatant" <bernard.vatant@mondeca.com>
To: <semantics@ivoa.net>
Subject: RE: some semantic puzzles from VOEvent
Date: Fri, 3 Jun 2005 15:00:08 +0200
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Just an addition after eventually finding out the VOEvent schema ...
http://www.ivoa.net/internal/IVOA/IvoaVOEvent/VOEvent-0.90.pdf

... good to see everything I wrote below is mostly useless, since it's all in that
document, basically. Sorry for the noise.
So either I missed the point of the questions, or their point is the difficulty to see the
articulation of the ontology with the data schema, e.g. how many entities, and of which
type is a VOEvent (as a data set) about. In the latter case, maybe what I wrote is worth
reading.

Bernard

> -----Message d'origine-----
> De : owner-semantics@eso.org [mailto:owner-semantics@eso.org]De la part
> de Bernard Vatant
> Envoye : vendredi 3 juin 2005 10:46
> A : semantics@ivoa.net
> Objet : RE: some semantic puzzles from VOEvent
>
>
>
> Some suggestions of tracks to answer Roy's puzzles ...
>
> (1) Adding an interpretation to a VOEvent. In the VOEvent schema, we have a
> "Why" section
> where the publisher can say what they think the event is (supernova or an outburst of a
> variable star or a microlensing event or GRB etc etc). We would like a formal vocabulary
> so that, for example, the computer can understand that "Supernova" and "SN" are the same
> thing. However, my simple attempts to do this as a new branch of the UCD tree
> blew up into
> a storm of controversy. How can we make progress here?
>
> BV : Preliminary question : I've mined the whole IVOA website looking for
> VOEvent schema,
> but could not find it. Is it available somewhere? Even as a draft?
> Seems to me that a science ontology should always make distinct the
> representation of the
> *experimental data* (which if I get it right, are what VOEvent(s) are about), and
> *interpretations* of those data. The word "event" is overloaded here, since it seems to
> encapsulate both, hence the difficulty, frequent in science. Although everyone
> involved in
> experimental science is aware (or should be) in theory of this distinction, in practice
> it's often forgotten when there is global implicit agreement on interpretation.
> When I say
> : "This is an infrared image of the planet Jupiter" I somehow forget the distinction. I
> should say : "This is the result of a process in which X have gathered bytes using such
> telescope, CCD, software ... and that Y interprets as being an image in IR of the planet
> Jupiter". But nobody would do that in that case, because everybody knows (or
> thinks so) or
> at least implicitly agrees upon what Jupiter *is* and looks like, what a planet
> *is*, and
> so on. There is a unique (implicit) interpretation in the common (implicit) ontology. Of
> course, this breaks for SN or GRB, where the question of interpretation is
> critical. I've
> an old Web Page about that issue [1].
>
> If one wants to clarify and formalize, this distinction has to be captured in the
> ontology. The way I see it, roughly and non-exhaustive, and independently of
> specific data
> or even scientific domain (this applies also in Biology, Earth Sciences, whatever). An
> "Event" is composed of one "Fact" and one or more "Interpretation(s)". When I
> say "Fact",
> read "experimental fact".
>
> Components of Fact
> 	What : Data Set (including values, units etc ...)
> 	When - Where : Space-Time location of the experiment
> 	How : Tools (Method, Instrument, Protocol ...)
> 	Who : Actor in the Fact (observer, data curator ...)
> 	Related Facts : Previous, Follow-up
> 	Framework : Research Program ...
> 	Why : Purpose of the event (why the data have been gathered for,
> hypothesis, whatever)
> 	...
>
> Components of Interpretation
> 	Science Object : The thing(s) data are about, and their type
> 	Model (this is more tricky : includes theoretical framework, world model, ...)
> 	Who : Who makes the interpretation
> 	Publication : Various material documenting the interpretation
> 	Support : Other facts and interpretations contributing to the interpretation
> 	Similar : Other facts interpreted as being about the same object
> 	...
>
> I would be happy to propose a more formal description of all that in a OWL
> format if folks
> are interested to review it.
>
> (2) Suppose we have a collection of Event observation packets *that are all about single
> astrophysical event*, but made by different people from different telescopes. How can I
> look at the interpretations ("Why" sections) and decide if there is a difference of
> opinion, or a change in interpretation with time? One report says the Event is a
> Supernova, another says it is a SupernovaType1a, another says it is a SN and
> another says
> "bright source associated with a galaxy". Are these four in agreement?
>
> BV : I've underlined *that are all about single astrophysical event*. Think about the
> meaning of this sentence at the light of the above distinction. You have different
> experimental facts, interpreted as being about the same object. Observer X has taken an
> image later interpreted as being a SN 1c in NGC 4038. Other, looking to the same sky
> coordinates, have obtained other data that they interpret as being images of the "same"
> object in the "same" galaxy (whatever this "sameness" actually means ...). The
> "object" is
> named 2004gt. Looking at some description :
> http://www.rochesterastronomy.org/supernova.html#2004gt ... the distinction between the
> fact and the interpretation is far from obvious.
>
> Now to answer directly your question about agreement, seems to me that there are three
> levels of agreement:
> 1. Agreement about speaking of the same fact(s) - same observation(s)
> 2. Agreements about interpretation :
> 	2.a : Agreement on "sameness" of object across different observations
> 	2.b : Agreement on type of this object
> For all those, all the point is to explicitly identify the subject of conversation.
> Agreement between SN and SN 1c interpretations can be inferred if the ontology
> of objects
> declares that SN 1C is a subclass of SN.
>
> (3) In VOEvent, there is a section for saying what was measured, and it is a
> collection of
> parameters that are characterized by UCD. For example PEAK_COUNT=3243 and R-MAG=17.5 and
> BANANA_FLUX=4.654. If I have a lot of VOEvent packets that refer to the same
> astrophysical
> event, can I extract a SED or light-curve (or time-dependent SED) by federating all the
> separate observations?
>
> BV: The answer is "yes" if the "what was measured" refers to an interpretation with
> agreement on 2.a (in terms of object sameness). When I extract a light-curve I am in the
> framework of interpretation. I mean there is no light-curve that is a fact, unless it's
> directly captured by a single instrument, protocol ... As long as you put together data
> from different sources, the agreement about those data being about the same
> thing supposes
> an (there again, most of the time implicit) agreement on a world model where this object
> is supposed to "exist".
>
> This seems somehow independent of any agreement on 2.b (type of the object)
> although it's
> not obvious that there can be any agreement on the sameness of an object if there is
> disagreement on its type. From a formal viewpoint, suppose you have declared in the
> ontology that SN 1a and SN 1c are disjoint subclasses of SN, if interpretation
> X says that
> E is instance of SN 1a and interpretation Y says that E is instance of SN 1b, but agree
> that E is the same object (same object identification), I can infer that X and Y are
> inconsistent (read : disagree).
>
> Hope that is helpful, and not adding to confusion :))
>
> [1] http://perso.wanadoo.fr/universimmedia/subjects.htm
>
> **********************************************************************************
>
> Bernard Vatant
> Senior Consultant
> Knowledge Engineering
> bernard.vatant@mondeca.com
>
> "Making Sense of Content" :  http://www.mondeca.com
> "Everything is a Subject" :  http://universimmedia.blogspot.com
>
> **********************************************************************************
>
>
>


From owner-semantics@eso.org  Fri Jun  3 16:21:03 2005
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Cc: Rob Seaman <seaman@noao.edu>
From: Rob Seaman <seaman@noao.edu>
Subject: Re: some semantic puzzles from VOEvent
Date: Fri, 3 Jun 2005 07:20:28 -0700
To: semantics@ivoa.net
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On Jun 3, 2005, at 6:00 AM, Bernard Vatant wrote:

> Just an addition after eventually finding out the VOEvent schema ...
> http://www.ivoa.net/internal/IVOA/IvoaVOEvent/VOEvent-0.90.pdf

The document has evolved a bit in response to comments from Kyoto.   
I've appended v0.92.  Rick Hessman has a draft schema that is now  
somewhat out of date:

     http://monet.uni-sw.gwdg.de/twiki/bin/viewauth/VOEvent

> ... good to see everything I wrote below is mostly useless, since  
> it's all in that
> document, basically. Sorry for the noise.

Actually, I found your message very useful.  Roy's questions were  
directed at the hardest issues we met at the workshop.  We (somewhat  
miraculously) reached a consensus on how to simplify the issues for  
the short term, but they haven't gone away.  In short, we're fast  
approaching v1.0 of VOEvent, but v2.0 is anticipated when other VO  
facilities mature sufficiently.  In general, VOEvent will provide an  
excellent motivator for a number of other VO technologies.

Rob Seaman
NOAO

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<HTML><BODY style=3D"word-wrap: break-word; -khtml-nbsp-mode: space; =
-khtml-line-break: after-white-space; "><DIV><DIV>On Jun 3, 2005, at =
6:00 AM, Bernard Vatant wrote:</DIV><BR =
class=3D"Apple-interchange-newline"><BLOCKQUOTE type=3D"cite"><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; ">Just an addition after eventually finding out the =
VOEvent schema ...</DIV><DIV style=3D"margin-top: 0px; margin-right: =
0px; margin-bottom: 0px; margin-left: 0px; "><A =
href=3D"http://www.ivoa.net/internal/IVOA/IvoaVOEvent/VOEvent-0.90.pdf">ht=
tp://www.ivoa.net/internal/IVOA/IvoaVOEvent/VOEvent-0.90.pdf</A></DIV></BL=
OCKQUOTE><DIV><FONT class=3D"Apple-style-span" color=3D"#0000DD"><BR =
class=3D"khtml-block-placeholder"></FONT></DIV><DIV><FONT =
class=3D"Apple-style-span" color=3D"#000000">The document has evolved a =
bit in response to comments from Kyoto.=A0 I've appended v0.92.=A0 Rick =
Hessman has a draft schema that is now somewhat out of =
date:</FONT></DIV><DIV><BR class=3D"khtml-block-placeholder"></DIV><DIV>=A0=
=A0 =A0<A =
href=3D"http://monet.uni-sw.gwdg.de/twiki/bin/viewauth/VOEvent">http://mon=
et.uni-sw.gwdg.de/twiki/bin/viewauth/VOEvent</A></DIV><DIV><FONT =
class=3D"Apple-style-span" color=3D"#0000DD"></FONT></DIV><BR><BLOCKQUOTE =
type=3D"cite"><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; ">... good to see everything I =
wrote below is mostly useless, since it's all in that</DIV><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; ">document, basically. Sorry for the =
noise.</DIV></BLOCKQUOTE><DIV><BR =
class=3D"khtml-block-placeholder"></DIV>Actually, I found your message =
very useful.=A0 Roy's questions were directed at the hardest issues we =
met at the workshop.=A0 We (somewhat miraculously) reached a consensus =
on how to simplify the issues for the short term, but they haven't gone =
away.=A0 In short, we're fast approaching v1.0 of VOEvent, but v2.0 is =
anticipated when other VO facilities mature sufficiently.=A0 In general, =
VOEvent will provide an excellent motivator for a number of other VO =
technologies.</DIV><DIV><BR><BLOCKQUOTE =
type=3D"cite"></BLOCKQUOTE></DIV><DIV><FONT class=3D"Apple-style-span" =
color=3D"#000000">Rob =
Seaman</FONT></DIV><DIV>NOAO</DIV><DIV></DIV></BODY></HTML>=

--Apple-Mail-3--85208119--

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From: Rob Seaman <seaman@noao.edu>
Subject: Re: some semantic puzzles from VOEvent
Date: Fri, 3 Jun 2005 08:34:28 -0700
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> The document has evolved a bit in response to comments from Kyoto.  =20=

> I've appended v0.92.

Woops!  Forgot something.  The document is appended.

Rob
---

=EF=BF=BC=

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<HTML><BODY style=3D"word-wrap: break-word; -khtml-nbsp-mode: space; =
-khtml-line-break: after-white-space; "><DIV><BLOCKQUOTE =
type=3D"cite"><DIV><DIV><FONT class=3D"Apple-style-span" =
color=3D"#000000">The document has evolved a bit in response to comments =
from Kyoto.=A0 I've appended =
v0.92.=A0</FONT></DIV></DIV></BLOCKQUOTE><BR></DIV><DIV>Woops!=A0 Forgot =
something.=A0 The document is appended.</DIV><DIV><BR =
class=3D"khtml-block-placeholder"></DIV><DIV>Rob</DIV><DIV>---</DIV><DIV><=
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From owner-semantics@eso.org  Fri Jun  3 18:35:37 2005
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From: "Bernard Vatant" <bernard.vatant@mondeca.com>
To: <semantics@ivoa.net>
Subject: RE: some semantic puzzles from VOEvent
Date: Fri, 3 Jun 2005 18:35:02 +0200
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Thanks Rob

... both for the document ... and appreciation of usefulness of my prose =
- at least one guy read it :))

Roy's questions were directed at the hardest issues we met at the =
workshop.

I guess so. I'm convinced that "what are our data about?" is indeed the =
hardest nut to crack today - everywhere. Not only in Astronomy, although =
it's the domain where the issue is the more likely to be understood, =
because it's a very old one here - as old as Astronomy itself. In other =
domains, it's worse, because people are often not even aware that there =
is an issue ... even so-called scientists (sigh). Things are improving, =
though. Many people in and around the Semantic Web technologies are =
fully aware that this question is really critical.
Browsing my blog below, you'll find a couple of interesting papers about =
it.

So my interest here (besides my life-long regret not to be the full-time =
astronomer I dreamt to be when I was a child ...) is to find out how =
efforts in various science domains can converge towards the definition =
of some efficient nut-crackers. That could be really useful here and =
everywhere, in this Galaxy and beyond.

Best Regards
*************************************************************************=
*********

Bernard Vatant
Senior Consultant
Knowledge Engineering
bernard.vatant@mondeca.com

"Making Sense of Content" :  http://www.mondeca.com
"Everything is a Subject" :  http://universimmedia.blogspot.com

*************************************************************************=
*********=20

  -----Message d'origine-----
  De : owner-semantics@eso.org [mailto:owner-semantics@eso.org]De la =
part de Rob Seaman
  Envoy=C3=A9 : vendredi 3 juin 2005 17:34
  =C3=80 : semantics@ivoa.net
  Cc : Rob Seaman
  Objet : Re: some semantic puzzles from VOEvent


    The document has evolved a bit in response to comments from Kyoto.? =
I've appended v0.92.?


  Woops!? Forgot something.? The document is appended.


  Rob
  ---


------=_NextPart_000_003A_01C5686A.F4824F90
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	charset="utf-8"
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=EF=BB=BF<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3Dutf-8">
<META content=3D"MSHTML 6.00.2900.2627" name=3DGENERATOR></HEAD>
<BODY=20
style=3D"WORD-WRAP: break-word; khtml-nbsp-mode: space; =
khtml-line-break: after-white-space">
<DIV><SPAN class=3D528171816-03062005><FONT face=3DArial color=3D#0000ff =
size=3D2>Thanks=20
Rob</FONT></SPAN></DIV>
<DIV><SPAN class=3D528171816-03062005><FONT face=3DArial color=3D#0000ff =

size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D528171816-03062005><FONT face=3DArial color=3D#0000ff =
size=3D2>...=20
both for the document ...&nbsp;and appreciation of usefulness of my =
prose - at=20
least one guy read it :))</FONT></SPAN></DIV>
<DIV><SPAN class=3D528171816-03062005><FONT face=3DArial color=3D#0000ff =

size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D528171816-03062005>Roy's questions were directed at =
the hardest=20
issues we met at the workshop.</SPAN></DIV>
<DIV><SPAN class=3D528171816-03062005></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D528171816-03062005><FONT face=3DArial color=3D#0000ff =
size=3D2>I=20
guess so. I'm convinced that&nbsp;"what are our data about?" is =
indeed&nbsp;the=20
hardest nut to crack today - everywhere. Not only in Astronomy, although =
it's=20
the domain where the issue is the more likely to be understood, because =
it's a=20
very old one here&nbsp;- as old as Astronomy itself. In other domains, =
it's=20
worse, because people are often not even aware that there is an issue =
... even=20
so-called scientists (sigh).&nbsp;Things are improving, though. Many =
people in=20
and around the Semantic Web technologies are fully aware that this =
question is=20
really critical.</FONT></SPAN></DIV>
<DIV><SPAN class=3D528171816-03062005><FONT face=3DArial color=3D#0000ff =

size=3D2>Browsing my blog below, you'll find a couple of interesting =
papers about=20
it.</FONT></SPAN></DIV>
<DIV><SPAN class=3D528171816-03062005><FONT face=3DArial color=3D#0000ff =

size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D528171816-03062005><FONT face=3DArial color=3D#0000ff =

size=3D2>So&nbsp;my interest here (besides my life-long regret not to be =
the=20
full-time astronomer&nbsp;I dreamt to be when I was a child ...) is to =
find out=20
how efforts in various science domains can converge towards the =
definition=20
of&nbsp;some efficient nut-crackers. That could be really useful here =
and=20
everywhere, in this Galaxy and beyond.</FONT></SPAN></DIV>
<DIV><SPAN class=3D528171816-03062005><FONT face=3DArial color=3D#0000ff =

size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D528171816-03062005><FONT face=3DArial color=3D#0000ff =
size=3D2>Best=20
Regards</FONT></SPAN></DIV>
<P><FONT=20
size=3D2>****************************************************************=
******************<BR><BR>Bernard=20
Vatant<BR>Senior Consultant<BR>Knowledge=20
Engineering<BR>bernard.vatant@mondeca.com<BR><BR>"Making Sense of =
Content"=20
:&nbsp; <A href=3D"http://www.mondeca.com/"=20
target=3D_blank>http://www.mondeca.com</A><BR>"Everything is a Subject" =
:&nbsp; <A=20
href=3D"http://universimmedia.blogspot.com/"=20
target=3D_blank>http://universimmedia.blogspot.com</A><BR><BR>***********=
***********************************************************************</=
FONT>=20
</P>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px =
solid; MARGIN-RIGHT: 0px">
  <DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
  size=3D2>-----Message d'origine-----<BR><B>De&nbsp;:</B> =
owner-semantics@eso.org=20
  [mailto:owner-semantics@eso.org]<B>De la part de</B> Rob=20
  Seaman<BR><B>Envoy=C3=A9&nbsp;:</B> vendredi 3 juin 2005 =
17:34<BR><B>=C3=80&nbsp;:</B>=20
  semantics@ivoa.net<BR><B>Cc&nbsp;:</B> Rob =
Seaman<BR><B>Objet&nbsp;:</B> Re:=20
  some semantic puzzles from VOEvent<BR><BR></FONT></DIV>
  <DIV>
  <BLOCKQUOTE type=3D"cite">
    <DIV>
    <DIV><FONT class=3DApple-style-span color=3D#000000>The document has =
evolved a=20
    bit in response to comments from Kyoto.? I've appended=20
    v0.92.?</FONT></DIV></DIV></BLOCKQUOTE><BR></DIV>
  <DIV>Woops!? Forgot something.? The document is appended.</DIV>
  <DIV><BR class=3Dkhtml-block-placeholder></DIV>
  <DIV>Rob</DIV>
  <DIV>---</DIV>
  <DIV><BR class=3Dkhtml-block-placeholder></DIV>
  <DIV></DIV></BLOCKQUOTE></BODY></HTML>

------=_NextPart_000_003A_01C5686A.F4824F90--


From owner-semantics@eso.org  Fri Jun  3 20:05:48 2005
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In thinking about how to mesh VOEvent with the science ontology, it 
appears that VOEvent is a kind of Publication.  Perhaps under Report.  
This is where IAU_Circular would also go.  Publications would have 
hasDescription and that would have subProperty hasExplanation.  The 
range of hasExplanation would include Explanation, Hypothesis, Theory, 
Postulate, Fact and Axiom where:
VOEvent would take Hypothesis and Theory
Hypothesis - One of several possible  testable explanations
Theory - Only known explanation  that  fits the  observed  data.

Hypothesis and Theory could in turn have hasExplanation of:
Postulate - statements of assumptions needed to continue the line of 
reasoning.
Axiom - a truth commonly accepted and in no need of proof.
Fact -  Real world facts (New York is in the US) and Mathematically or 
logically proven statements.

The VOEvent is different from  ast:Event because an instance of an 
ast:Event is the event itself not claims about the event.   However, 
times, locations and measurements of the event do belong in ast:Event. 
Once there is a theory of the event it can be subclassed to the specific 
type of event that it is (ast:supernova etc).

Ed


From owner-semantics@eso.org  Fri Jun  3 20:38:55 2005
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From: Rob Seaman <seaman@noao.edu>
Subject: Re: some semantic puzzles from VOEvent
Date: Fri, 3 Jun 2005 11:38:05 -0700
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Bernard Vatant comments on Roy's VOEvent issues:

> (1) [...]  We would like a formal vocabulary so that, for example,  
> the computer can understand that "Supernova" and "SN" are the same  
> thing. However, my simple attempts to do this as a new branch of  
> the UCD tree blew up into a storm of controversy. How can we make  
> progress here?

>> everybody knows (or thinks so) or at least implicitly agrees upon  
>> what Jupiter *is* and looks like, what a planet *is*, and so on.  
>> There is a unique (implicit) interpretation in the common  
>> (implicit) ontology.

"Jupiter" is a proper name for a specific entity.  That  
identification is simply a definition under the control of the  
appropriate IAU committee or some other international body.  There is  
intrinsic ambiguity, however, with the definition of classes of  
objects - with nouns that don't correspond to proper names.  What is  
a planet?  What is a gas giant?  For many purposes the answers to  
these questions are obvious, something like: a gravitationally bound  
non-stellar entity orbiting a star.  (Although it quickly becomes  
obvious that all definitions depend on other definitions.)  For other  
purposes, such as the characterization of planetary atmospheres or  
magnetic fields, the precise transition from Jupiter to  
interplanetary space may be hazy indeed.

As far as the storm of UCD controversy - isn't that where the fun  
is?  My characterization of Rick Hessman is that he will pursue his  
<Concept> factory whether or not it is associated with UCDs or other  
VO standards.  The only controversy is to avoid splitting the  
development tree :-)

> (2) [...] One report says the Event is a Supernova, another says it  
> is a SupernovaType1a, another says it is a SN and another says  
> "bright source associated with a galaxy". Are these four in agreement?

>> Observer X has taken an image later interpreted as being a SN 1c  
>> in NGC 4038. Other, looking to the same sky
>> coordinates, have obtained other data that they interpret as being  
>> images of the "same" object in the "same" galaxy (whatever this  
>> "sameness" actually means ...).

I presume synonyms such as "Supernova" and "SN" will be trivial to  
handle.  Less trivial might the the example at the bottom of section  
3.7 of the VOEvent specification.  The object or process that has a  
proper name of "Tycho's Stella Nova" is classified as "SN 1a".  An  
assertion is made that this is associated with the object/process  
called "3C 10" which is classified as a "supernova remnant".   
Astronomy abounds with famous objects for which large numbers of  
reliable identifications and classifications of various sorts are  
available.  We are more interested in how to classify the question  
marks - in precisely the terra incognito of the emerging ontological  
maps.  A description of the science that was current last year is not  
going to prove exceptionally helpful.  A successful ontology will be  
one that includes an easy process for growth and hypothesis.

> (3) [...] If I have a lot of VOEvent packets that refer to the same  
> astrophysical event, can I extract a SED or light-curve (or time- 
> dependent SED) by federating all the separate observations?

>> As long as you put together data from different sources, the  
>> agreement about those data being about the same thing supposes an  
>> (there again, most of the time implicit) agreement on a world  
>> model where this object is supposed to "exist".

I think the issue here is broader than VOEvent.  VOEvent is a  
mechanism for alerting systems and personnel to transient events.  A  
VOEvent might well trigger a VO query that would result in the  
generation of a light-curve or SED.  These secondary data products or  
inferences might then generate a followup VOEvent aimed at producing  
further observations to confirm or extend some resulting hypothesis.

Rob Seaman
NOAO

From owner-semantics@eso.org  Sat Jun  4 01:58:06 2005
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From: Rob Seaman <seaman@noao.edu>
Subject: Re: some remarks on VOEvent
Date: Fri, 3 Jun 2005 16:57:19 -0700
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On Jun 3, 2005, at 11:05 AM, Ed Shaya wrote:

> Hypothesis - One of several possible testable explanations
> Theory - Only known explanation that fits the observed  data.
> Postulate - statements of assumptions needed to continue the line  
> of reasoning.
> Axiom - a truth commonly accepted and in no need of proof.
> Fact -  Real world facts (New York is in the US) and Mathematically  
> or logically proven statements.

I'm concerned at an apparent emphasis here toward a "science fair"  
model of the scientific method.  Successful science is more often  
inductive, not deductive.  The difference between a fact and a  
hypothesis is one of degree, not absolute confirmation via theory.   
Theories are often only approximately correct - and approximation is  
often much more than good enough a foundation for drawing further  
inferences.

Postulates are extremely frequent in astronomy - axioms extremely rare.

> The VOEvent is different from  ast:Event because an instance of an  
> ast:Event is the event itself not claims about the event.    
> However, times, locations and measurements of the event do belong  
> in ast:Event. Once there is a theory of the event it can be  
> subclassed to the specific type of event that it is (ast:supernova  
> etc).

Which begs the question of the definition of "event".  We may know  
one when we see one - Tycho's SN was apparently hard to miss - but  
even the distinction between an "object" and a "process" is fuzzy.  A  
star can be viewed as a 10 billion year nuclear process.  Is an event  
simply a process with a big amplitude of short fuse?  Define  
"short".  Define "big".

I understand a VOEvent - I've had a hand in its definition.  I fear  
the entire astronomical community will never understand an ast:Event  
well enough to make it useful.  (Would be delighted to be proven  
wrong...)

To put it another way, the most interesting events are like UFOs -  
theories are hard to come by.  The benefit of ontologies and UCDs and  
other semantic "technology" is precisely to help us to winnow out the  
pie plates and weather balloons.  It is the UFO sightings that are  
left after all the current theories are exhausted that we are  
interested in.

The only reason to classify Snarks is to find Boojums.

Rob Seaman
NOAO

From owner-semantics@eso.org  Sat Jun  4 02:25:26 2005
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From: Roy Williams <roy@cacr.caltech.edu>
Subject: Re: some remarks on VOEvent
Date: Fri, 3 Jun 2005 17:24:39 -0700
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On Jun 3, 2005, at 4:57 PM, Rob Seaman wrote:

> On Jun 3, 2005, at 11:05 AM, Ed Shaya wrote:
>
>> Hypothesis - One of several possible testable explanations
>> Theory - Only known explanation that fits the observed  data.
>> Postulate - statements of assumptions needed to continue the line of 
>> reasoning.
>> Axiom - a truth commonly accepted and in no need of proof.
>> Fact -  Real world facts (New York is in the US) and Mathematically 
>> or logically proven statements.
>
> I'm concerned at an apparent emphasis here toward a "science fair" 
> model of the scientific method.  Successful science is more often 
> inductive, not deductive.  The difference between a fact and a 
> hypothesis is one of degree, not absolute confirmation via theory.  
> Theories are often only approximately correct - and approximation is 
> often much more than good enough a foundation for drawing further 
> inferences.

We model this in VOEvent by allowing the publisher of the event to 
separate information into different areas. It is the responsibility of 
the publisher to put statements in these areas.
Who (is the publisher et al),
What (are the parameter values),
WhereWhen (the space-time coordinates),
How (the observation is made), and
Why (opinions of publisher: Interpretation, Hypothesis, Classification, 
Importance, etc etc).
>
>> The VOEvent is different from  ast:Event because an instance of an 
>> ast:Event is the event itself not claims about the event.   However, 
>> times, locations and measurements of the event do belong in 
>> ast:Event. Once there is a theory of the event it can be subclassed 
>> to the specific type of event that it is (ast:supernova etc).
>
> Which begs the question of the definition of "event".  We may know one 
> when we see one - Tycho's SN was apparently hard to miss - but even 
> the distinction between an "object" and a "process" is fuzzy.  A star 
> can be viewed as a 10 billion year nuclear process.  Is an event 
> simply a process with a big amplitude of short fuse?  Define "short".  
> Define "big".

More properly we should *not* say VOEvent represents an astrophysical 
event, but rather it represents an *observation* of an event. Each 
observation is assigned an ID. Suppose we assume that when a VOEvent 
cites another, then it is concerning the same event. Therefore we can 
group all the observations that are linked through a chain of citation, 
and try to associate the group with an astrophysical source. Note that 
this group may include null observations -- "we measured flux from five 
galaxies in the error circle, and one was anomalous". Thus our 
technology needs to find these clusters of VOEvents even when they are 
published to different registries. It is the same as the distributed 
cross-match problem, but using event IDs in place of sky position.
>
> I understand a VOEvent - I've had a hand in its definition.  I fear 
> the entire astronomical community will never understand an ast:Event 
> well enough to make it useful.  (Would be delighted to be proven 
> wrong...)
>
> To put it another way, the most interesting events are like UFOs - 
> theories are hard to come by.  The benefit of ontologies and UCDs and 
> other semantic "technology" is precisely to help us to winnow out the 
> pie plates and weather balloons.  It is the UFO sightings that are 
> left after all the current theories are exhausted that we are 
> interested in.
>
> The only reason to classify Snarks is to find Boojums.

From owner-semantics@eso.org  Sat Jun  4 08:02:20 2005
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Subject: Re: some remarks on VOEvent
Date: Fri, 3 Jun 2005 23:01:52 -0700
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Roy says:

> More properly we should *not* say VOEvent represents an  
> astrophysical event, but rather it represents an *observation* of  
> an event.

And "observation" is the default role to distinguish actual VOEvent  
packets from tests and predictions.  It's the word "event" that is  
shaky.  An astronomical event can extend vast distances and persist  
over immense periods of time.  The observations that we're tracing  
together as followup VOEvents may well involve detections of distinct  
physical effects arising from disjoint regions of space-time.  We can  
trust that causality ultimately ties it all together - but causality  
is inferred, not observed.

One could argue that the semantic structure of a VOEvent is on a more  
stable footing than the astronomical ontology we would hope to lean  
it upon.  My point?  My point is that a single static astronomical  
ontology is a vain hope - rather, we need a flexible mechanism for  
building and extending a rich network of context dependent ontologies  
as time and tide require.

That's actually a good example that may illuminate these issues.  It  
would be straightforward to describe a specific ocean tide  
measurement in a VOEvent packet.  These are certainly observations of  
astronomical events, after all.  Conjectures on tidal expressions in  
astronomical ontologies?  Will these support generalized central  
force representations?  And will they be expressed as spatial  
derivatives of Kepler's or Newton's laws?  Or, rather, directly as an  
inverse cube?

Rob

From owner-semantics@eso.org  Sat Jun  4 09:30:23 2005
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On Fri, 3 Jun 2005, Rob Seaman wrote:

......

> That's actually a good example that may illuminate these issues.  It
> would be straightforward to describe a specific ocean tide
> measurement in a VOEvent packet.  These are certainly observations of
> astronomical events, after all.  Conjectures on tidal expressions in
> astronomical ontologies?  Will these support generalized central
> force representations?  And will they be expressed as spatial
> derivatives of Kepler's or Newton's laws?  Or, rather, directly as an
> inverse cube?

Or a comet breaking up. Once it is seen to break up, does each part form a
separate VOEvent? Or is it a single VOEvent extending over larger and
larger distance. What when some of the pieces have banged into a planet
and others have not?

This question has been asked before:
Should we try to describe everything for everyone? Or should we choose
"sensible" (clearly a politically incorrect term in this context, what I
mean is events that 3-sigma astronomers care about) events and build more
stable structures around those?

-ashish

Ashish Mahabal, Caltech Astronomy, Pasadena, CA 91125
http://www.astro.caltech.edu/~aam aam at astro.caltech.edu

My computer isn't that nervous...it's just a bit ANSI.

From owner-semantics@eso.org  Sat Jun  4 16:15:59 2005
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Rob Seaman wrote:

> Roy says:
>
>> More properly we should *not* say VOEvent represents an  
>> astrophysical event, but rather it represents an *observation* of  an 
>> event.
>
>
> And "observation" is the default role to distinguish actual VOEvent  
> packets from tests and predictions.  It's the word "event" that is  
> shaky.  An astronomical event can extend vast distances and persist  
> over immense periods of time.  The observations that we're tracing  
> together as followup VOEvents may well involve detections of distinct  
> physical effects arising from disjoint regions of space-time.  We can  
> trust that causality ultimately ties it all together - but causality  
> is inferred, not observed.
>
   I'm afraid I don't get what you are flaming about here.  Why is it 
possible to define a VOEvent but not an event?
I thought the VOEvent is the VO publication of an observation of an 
ast:event.  So an ast:event is anything you would create a VOEvent 
about.  VOEvent is similar to an IAU-Circular which is the rapidly 
published information about an ongoing  rapidly developing event (or 
process if you want).  The circular is not the event, one needs to 
ontologicaly separate the two.  Because VOEvent is a publication it 
automatically inherits properties of a Publication such as 
DateOfPublication and Author (which may not be the same as the 
Observer).  These things would not normally be in the properties of an 
ast:event.

> One could argue that the semantic structure of a VOEvent is on a more  
> stable footing than the astronomical ontology we would hope to lean  
> it upon.  My point?  My point is that a single static astronomical  
> ontology is a vain hope - rather, we need a flexible mechanism for  
> building and extending a rich network of context dependent ontologies  
> as time and tide require.
>
Ontology allows one to use natural language to make statements and 
query.  The whole idea is to bring the flexibility of human language to 
machines (but perhaps to make it a bit clearer).  If you think this is a 
vain hope then why are you on this list?

> That's actually a good example that may illuminate these issues.  It  
> would be straightforward to describe a specific ocean tide  
> measurement in a VOEvent packet.  These are certainly observations of  
> astronomical events, after all.  Conjectures on tidal expressions in  
> astronomical ontologies?  Will these support generalized central  
> force representations?  And will they be expressed as spatial  
> derivatives of Kepler's or Newton's laws?  Or, rather, directly as an  
> inverse cube?
>
Ah.  So what you want is inflexibility.  You want to ensure that 
VOEvents do not have explanations of explanations or any other deep 
discussion of the event.   Indeed, OWL is not good for cutting off 
discussion.  It is always possible to make statements about statements 
and to extend classes on the fly.  XML Schema is much better for 
defining specific hard to alter structure.  So that is fine.  If the VO 
wants hardwired structures it should study the issue with Ontologies 
(because only in ontologies can you see the big picture with 
relationships between all of the components of the langauge)   and then 
use that as a starting point for creating limiting UML or Schema.

However, if one day there were a tide that went around the earth that 
was two time larger than any previously recorded tide,  I for one would 
like to see hypothesis and the detailed explanation of these with 
discussions of spatial derivatives and wave equations as soon as 
possible.  VOEvent might be a mechanism to spread this as rapidly as 
possible.  You might argue that there are no applications that could do 
anything with such details, but we are working on that too.

Ed

> Rob



From owner-semantics@eso.org  Sat Jun  4 18:38:20 2005
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From: Rob Seaman <seaman@noao.edu>
Subject: Fwd: some remarks on VOEvent
Date: Sat, 4 Jun 2005 09:36:28 -0700
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On Jun 4, 2005, at 7:13 AM, Ed Shaya wrote:

>   I'm afraid I don't get what you are flaming about here.  Why is  
> it possible to define a VOEvent but not an event?

My apologies if I seemed to be flaming.  I thought we were just  
having a conversation - expressing diverse views.

A VOEvent - as Roy helpfully pointed out - is the report of an  
observation.  Hundreds of years of scientific developments have  
provided very fine grained utilitarian definitions of "observation"  
and "measurement" and other experimental concepts - and of specific  
flavor reports of same.  "Event" is a nice flexible English word -  
but more on the theoretical side than the experimental.  In its  
colloquial sense, the word "event" is likely broader in its  
connotations in astronomy than in any other discipline.  I thought  
the point of ontology was precisely to capture colloquial meanings in  
a bottle.  I suspect "event" is one such word that will be hard to so  
capture.  My worry - a worry that I've heard others express without  
deeming them to be flaming - is that "ontology" is a synonym for "non- 
pragmatic".

> Ontology allows one to use natural language to make statements and  
> query.  The whole idea is to bring the flexibility of human  
> language to machines (but perhaps to make it a bit clearer).  If  
> you think this is a vain hope then why are you on this list?

I don't think it is a vain hope to build targeted ontologies - note  
the plural.  I'm on the list because all of a sudden there are four  
or more lists for discussing VO semantics and we keep being shuffled  
off to the next list over.  VOEvent presents an interesting  
opportunity for the VO to wrestle with real world semantic  
requirements.  Should this particular list be renamed  
"ontology@ivoa.net"?  Can semantics be profitably pursued as an  
activity separate from other VO work?

> Ah.  So what you want is inflexibility.  You want to ensure that  
> VOEvents do not have explanations of explanations or any other deep  
> discussion of the event.

Not what I want at all.  Although I might suggest that "deep  
discussion" is an emergent property from a long sequence of richly  
braided followup packets.  To optimize its utility, a single VOEvent  
will typically express a single coherent observation or hypothesis.   
VOEvent is a specific VO facility with a clear mission - to report  
alerts to the community via software agents.  In many instances,  
VOEvents will be used to trigger more in depth analysis via other VO  
facilities.  An "alert" and a "deep discussion" are indeed quite  
different modes of communication.

> If the VO wants hardwired structures it should study the issue with  
> Ontologies (because only in ontologies can you see the big picture  
> with relationships between all of the components of the langauge)   
> and then use that as a starting point for creating limiting UML or  
> Schema.

"Limiting UML"?  :-)  If an ontology is something so open-ended that  
UML is seen to be limited by comparison, then perhaps Merriam-Webster  
is right to call ontology a branch of metaphysics.  I was just  
standing up for ontologies the other day on one of the gazillions of  
UCD lists.  There is little point to UCDs without an underlying  
ontological formalism.  But by the same token, there is little point  
to ontologies if they aren't seen to be pragmatically wrestling with  
real world issues - at least on occasion.  VOEvent is an opportunity  
for elucidating real world requirements and building real world VO  
systems.

Phenomenologically yours,

Rob



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<HTML><BODY style=3D"word-wrap: break-word; -khtml-nbsp-mode: space; =
-khtml-line-break: after-white-space; "><DIV><DIV><DIV><DIV><DIV><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 12px;"><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;"><FONT class=3D"Apple-style-span" =
color=3D"#000000"><FONT class=3D"Apple-style-span" face=3D"Lucida Sans" =
size=3D"3"><SPAN class=3D"Apple-style-span" style=3D"font-size: =
12px;"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;">On Jun 4, 2005, at =
7:13 AM, Ed Shaya =
wrote:</SPAN></FONT></SPAN></FONT></FONT></SPAN></FONT></SPAN></DIV><FONT =
class=3D"Apple-style-span" color=3D"#000000"><FONT =
class=3D"Apple-style-span" face=3D"Lucida Sans"><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;"><BR =
class=3D"Apple-interchange-newline"></SPAN></FONT></FONT></FONT><BLOCKQUOT=
E type=3D"cite"><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; "><SPAN =
class=3D"Apple-converted-space"><FONT class=3D"Apple-style-span" =
face=3D"Lucida Sans"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;"><FONT =
class=3D"Apple-style-span" =
color=3D"#0000FF">=A0=A0</FONT></SPAN></FONT></FONT></SPAN><FONT =
class=3D"Apple-style-span" face=3D"Lucida Sans"><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;"><FONT class=3D"Apple-style-span" =
color=3D"#0000FF">I'm afraid I don't get what you are flaming about =
here.</FONT></SPAN></FONT></FONT><SPAN =
class=3D"Apple-converted-space"><FONT class=3D"Apple-style-span" =
face=3D"Lucida Sans"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;"><FONT =
class=3D"Apple-style-span" color=3D"#0000FF">=A0 =
</FONT></SPAN></FONT></FONT></SPAN><FONT class=3D"Apple-style-span" =
face=3D"Lucida Sans"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;"><FONT =
class=3D"Apple-style-span" color=3D"#0000FF">Why is it possible to =
define a VOEvent but not an =
event?</FONT></SPAN></FONT></FONT></DIV></BLOCKQUOTE><DIV><FONT =
class=3D"Apple-style-span" color=3D"#000000"><FONT =
class=3D"Apple-style-span" face=3D"Lucida Sans"><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;"><BR =
class=3D"khtml-block-placeholder"></SPAN></FONT></FONT></FONT></DIV><FONT =
class=3D"Apple-style-span" color=3D"#000000"><FONT =
class=3D"Apple-style-span" face=3D"Lucida Sans"><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;">My apologies if I seemed to be flaming.=A0 I =
thought we were just having a conversation - expressing diverse =
views.</SPAN></FONT></FONT></FONT></DIV><DIV><FONT =
class=3D"Apple-style-span" color=3D"#000000"><FONT =
class=3D"Apple-style-span" face=3D"Lucida Sans"><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;"><BR =
class=3D"khtml-block-placeholder"></SPAN></FONT></FONT></FONT></DIV><DIV><=
FONT class=3D"Apple-style-span" color=3D"#000000"><FONT =
class=3D"Apple-style-span" face=3D"Lucida Sans"><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;">A VOEvent - as Roy helpfully pointed out - is =
the report of an observation.=A0 Hundreds of years of scientific =
developments have provided very fine grained utilitarian definitions of =
"observation" and "measurement" and other experimental concepts - and of =
specific flavor reports of same.=A0 "Event" is a nice flexible English =
word - but more on the theoretical side than the =
experimental.</SPAN></FONT></FONT></FONT><FONT class=3D"Apple-style-span" =
color=3D"#000000"><FONT class=3D"Apple-style-span" face=3D"Lucida =
Sans"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;"></SPAN>=A0=A0<FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;">In its colloquial sense, the word "event" is =
likely broader in its connotations in astronomy than in any other =
discipline.=A0 I thought the point of ontology was precisely to capture =
colloquial meanings in a bottle. =A0I suspect "event" is one such word =
that will be hard to so capture. =
=A0</SPAN></FONT></FONT></FONT></FONT><FONT class=3D"Apple-style-span" =
color=3D"#000000"><FONT class=3D"Apple-style-span" face=3D"Lucida =
Sans"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;">My worry - a worry =
that I've heard others express without deeming them to be flaming - is =
that "ontology" is a synonym for =
"non-pragmatic".</SPAN></FONT></FONT></FONT></DIV><DIV><FONT =
class=3D"Apple-style-span" color=3D"#000000"><FONT =
class=3D"Apple-style-span" face=3D"Lucida Sans"><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;"><BR></SPAN></FONT></FONT></FONT><BLOCKQUOTE =
type=3D"cite"><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; "><FONT class=3D"Apple-style-span" =
face=3D"Lucida Sans"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;"><FONT =
class=3D"Apple-style-span" color=3D"#0000FF">Ontology allows one to use =
natural language to make statements and =
query.</FONT></SPAN></FONT></FONT><SPAN =
class=3D"Apple-converted-space"><FONT class=3D"Apple-style-span" =
face=3D"Lucida Sans"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;"><FONT =
class=3D"Apple-style-span" color=3D"#0000FF">=A0 =
</FONT></SPAN></FONT></FONT></SPAN><FONT class=3D"Apple-style-span" =
face=3D"Lucida Sans"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;"><FONT =
class=3D"Apple-style-span" color=3D"#0000FF">The whole idea is to bring =
the flexibility of human language to machines (but perhaps to make it a =
bit clearer).</FONT></SPAN></FONT></FONT><SPAN =
class=3D"Apple-converted-space"><FONT class=3D"Apple-style-span" =
face=3D"Lucida Sans"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;"><FONT =
class=3D"Apple-style-span" color=3D"#0000FF">=A0 =
</FONT></SPAN></FONT></FONT></SPAN><FONT class=3D"Apple-style-span" =
face=3D"Lucida Sans"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;"><FONT =
class=3D"Apple-style-span" color=3D"#0000FF">If you think this is a vain =
hope then why are you on this =
list?</FONT></SPAN></FONT></FONT></DIV></BLOCKQUOTE><DIV><FONT =
class=3D"Apple-style-span" color=3D"#000000"><FONT =
class=3D"Apple-style-span" face=3D"Lucida Sans"><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;"><BR =
class=3D"khtml-block-placeholder"></SPAN></FONT></FONT></FONT></DIV><FONT =
class=3D"Apple-style-span" color=3D"#000000"><FONT =
class=3D"Apple-style-span" face=3D"Lucida Sans"><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;">I don't think it is a vain hope to build =
targeted ontologies - note the plural.=A0 I'm on the list because all of =
a sudden there are four or more lists for discussing VO semantics and we =
keep being shuffled off to the next list over.=A0 VOEvent presents an =
interesting opportunity for the VO to wrestle with real world semantic =
requirements.=A0 Should this particular list be renamed =
"</SPAN></FONT></FONT></FONT><A href=3D"mailto:ontology@ivoa.net"><FONT =
class=3D"Apple-style-span" color=3D"#000000"><FONT =
class=3D"Apple-style-span" face=3D"Lucida Sans"><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: =
13px;">ontology@ivoa.net</SPAN></FONT></FONT></FONT></A><FONT =
class=3D"Apple-style-span" color=3D"#000000"><FONT =
class=3D"Apple-style-span" face=3D"Lucida Sans"><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;">"?=A0 Can semantics be profitably pursued as =
an activity separate from other VO =
work?</SPAN></FONT></FONT></FONT></DIV><DIV><FONT =
class=3D"Apple-style-span" color=3D"#000000"><FONT =
class=3D"Apple-style-span" face=3D"Lucida Sans"><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;"><BR =
class=3D"khtml-block-placeholder"></SPAN></FONT></FONT></FONT></DIV><DIV =
style=3D"text-align: justify;"><BLOCKQUOTE type=3D"cite"><BLOCKQUOTE =
type=3D"cite"></BLOCKQUOTE><DIV style=3D"margin-top: 0px; margin-right: =
0px; margin-bottom: 0px; margin-left: 0px; "><FONT =
class=3D"Apple-style-span" face=3D"Lucida Sans"><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;"><FONT class=3D"Apple-style-span" =
color=3D"#0000FF">Ah.</FONT></SPAN></FONT></FONT><SPAN =
class=3D"Apple-converted-space"><FONT class=3D"Apple-style-span" =
face=3D"Lucida Sans"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;"><FONT =
class=3D"Apple-style-span" color=3D"#0000FF">=A0 =
</FONT></SPAN></FONT></FONT></SPAN><FONT class=3D"Apple-style-span" =
face=3D"Lucida Sans"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;"><FONT =
class=3D"Apple-style-span" color=3D"#0000FF">So what you want is =
inflexibility.=A0=A0You want to ensure that VOEvents do not have =
explanations of explanations or any other deep discussion of the =
event.</FONT></SPAN></FONT></FONT></DIV></BLOCKQUOTE><DIV =
style=3D"text-align: justify;"><FONT class=3D"Apple-style-span" =
color=3D"#000000"><FONT class=3D"Apple-style-span" face=3D"Lucida =
Sans"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;"><BR =
class=3D"khtml-block-placeholder"></SPAN></FONT></FONT></FONT></DIV><FONT =
class=3D"Apple-style-span" color=3D"#000000"><FONT =
class=3D"Apple-style-span" face=3D"Lucida Sans"><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;">Not what I want at all.=A0 Although I might =
suggest that "deep discussion" is an emergent property from a long =
sequence of richly braided followup packets.=A0 To optimize its utility, =
a single VOEvent will typically express a single coherent observation or =
hypothesis.=A0 VOEvent is a specific VO facility with a clear mission - =
to report alerts to the community via software agents.=A0 In many =
instances, VOEvents will be used to trigger more in depth analysis via =
other VO facilities.=A0 An "alert" and a "deep discussion" are indeed =
quite different modes of =
communication.</SPAN></FONT></FONT></FONT></DIV><DIV style=3D"text-align: =
justify;"><FONT class=3D"Apple-style-span" color=3D"#000000"><FONT =
class=3D"Apple-style-span" face=3D"Lucida Sans"><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;"><BR></SPAN></FONT></FONT></FONT><BLOCKQUOTE =
type=3D"cite"><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; "><SPAN =
class=3D"Apple-converted-space"><FONT class=3D"Apple-style-span" =
face=3D"Lucida Sans"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;"> =
</SPAN></FONT></FONT></SPAN><FONT class=3D"Apple-style-span" =
face=3D"Lucida Sans"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;"><FONT =
class=3D"Apple-style-span" color=3D"#0000FF">If the VO wants hardwired =
structures it should study the issue with Ontologies (because only in =
ontologies can you see the big picture with relationships between all of =
the components of the langauge)=A0</FONT></SPAN></FONT></FONT><SPAN =
class=3D"Apple-converted-space"><FONT class=3D"Apple-style-span" =
face=3D"Lucida Sans"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;"><FONT =
class=3D"Apple-style-span" color=3D"#0000FF"> =
</FONT></SPAN></FONT></FONT></SPAN><FONT class=3D"Apple-style-span" =
face=3D"Lucida Sans"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;"><FONT =
class=3D"Apple-style-span" color=3D"#0000FF">and then use that as a =
starting point for creating limiting UML or =
Schema.</FONT></SPAN></FONT></FONT><FONT class=3D"Apple-style-span" =
face=3D"Lucida Sans"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;"><FONT =
class=3D"Apple-style-span" =
color=3D"#0000FF"><BR></FONT></SPAN></FONT></FONT></DIV></BLOCKQUOTE><FONT=
 class=3D"Apple-style-span" color=3D"#000000"><FONT =
class=3D"Apple-style-span" face=3D"Lucida Sans"><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;"><BR></SPAN></FONT></FONT></FONT></DIV><DIV =
style=3D"text-align: justify;"><FONT class=3D"Apple-style-span" =
color=3D"#000000"><FONT class=3D"Apple-style-span" face=3D"Lucida =
Sans"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;">"Limiting UML"?=A0 =
:-)=A0 If an ontology is something so open-ended that UML is seen to be =
limited by comparison, then perhaps Merriam-Webster is right to call =
ontology a branch of metaphysics.=A0 I was just standing up for =
ontologies the other day on one of the gazillions of UCD lists.=A0 There =
is little point to UCDs without an underlying ontological formalism.=A0 =
But by the same token, there is little point to ontologies if they =
aren't seen to be pragmatically wrestling with real world issues - at =
least on occasion.=A0 VOEvent is an opportunity for elucidating real =
world requirements and building real world VO =
systems.</SPAN></FONT></FONT></FONT></DIV><DIV style=3D"text-align: =
justify;"><FONT class=3D"Apple-style-span" face=3D"Lucida Sans" =
size=3D"3"><SPAN class=3D"Apple-style-span" style=3D"font-size: =
13px;"><BR class=3D"khtml-block-placeholder"></SPAN></FONT></DIV><DIV =
style=3D"text-align: justify;"><FONT class=3D"Apple-style-span" =
face=3D"Lucida Sans" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;">Phenomenologically =
yours,</SPAN></FONT></DIV><DIV style=3D"text-align: justify;"><FONT =
class=3D"Apple-style-span" color=3D"#000000"><FONT =
class=3D"Apple-style-span" face=3D"Lucida Sans"><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;"><BR></SPAN></FONT></FONT></FONT></DIV><DIV =
style=3D"text-align: justify;"><FONT class=3D"Apple-style-span" =
color=3D"#000000"><FONT class=3D"Apple-style-span" face=3D"Lucida =
Sans"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: =
13px;">Rob</SPAN></FONT></FONT></FONT></DIV></DIV></DIV><BR></DIV><BR></BO=
DY></HTML>=

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Cc: Roy Williams <roy@cacr.caltech.edu>, Rob Seaman <seaman@noao.edu>
From: Roy Williams <roy@cacr.caltech.edu>
Subject: Re: some remarks on VOEvent
Date: Sat, 4 Jun 2005 10:22:10 -0700
To: semantics@ivoa.net
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> On Fri, 3 Jun 2005, Rob Seaman wrote:
>> That's actually a good example that may illuminate these issues.  It
>> would be straightforward to describe a specific ocean tide
>> measurement in a VOEvent packet.  These are certainly observations of
>> astronomical events, after all.  Conjectures on tidal expressions in
>> astronomical ontologies?  Will these support generalized central
>> force representations?  And will they be expressed as spatial
>> derivatives of Kepler's or Newton's laws?  Or, rather, directly as an
>> inverse cube?
>
On Jun 4, 2005, at 12:29 AM, Ashish Mahabal wrote:
> Or a comet breaking up. Once it is seen to break up, does each part 
> form a
> separate VOEvent? Or is it a single VOEvent extending over larger and
> larger distance. What when some of the pieces have banged into a planet
> and others have not?

The key is to let the event publisher make the difficult decisions. If 
the publisher submits new VOEvent packets for each piece of comet with 
no citation, then they are separate. If the publisher chooses to cites 
a unique previous VOEvent that refers to the whole comet, then they are 
linked by citation chain, and we consider the whole "intra-cited" group 
to be one astrophysical event.
>
> This question has been asked before:
> Should we try to describe everything for everyone?

NO NO and NO. But we should give people "on the scene" the opportunity 
and space to use their scientific judgement to make descriptions as 
they see fit.

From owner-semantics@eso.org  Sat Jun  4 22:16:31 2005
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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: <semantics@ivoa.net>
Subject: boundaries
Date: Sat, 4 Jun 2005 21:16:05 +0100
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The discussions here on VOEvent have been interesting but I feel we may be
straying into the territory of the VOEvent workgroup.

While it is certainly useful for the Semantics IG to discuss in generic
terms what the scope of the AstroOntology ought to be and to use the VOEvent
case as an example, I think it might be more appropriate, where a group of
experts and interested parties does exist, to pass specific questions of
term definition to that group for resolution. Semantics IG can then
concentrate on conceptual issues such as how we define ontologies, how we
make them useful and extensible and where they might be used in the VObs
architecture.

What do others think about the boundary between this group and the
workgroups? And what is the best way to capture that boundary in the charter
of the group?

Cheers,
Tony. 

-- 
Tony Linde
Phone:  +44 (0)116 223 1292      Mobile: +44 (0)7753 603356
Fax:    +44 (0)116 252 3311      Email:  Tony.Linde@leicester.ac.uk
Skype:  callto:tonylinde (home)  callto:tonylinde2 (work)
Post:   Department of Physics & Astronomy, University of Leicester
        Leicester, UK   LE1 7RH
Web:    http://www.star.le.ac.uk/~ael
            
Project Manager, EuroVO VOTech   http://eurovotech.org 
Programme Manager, AstroGrid     http://www.astrogrid.org 
Co-Director,
 Leicester e-Science Centre      http://www.e-science.le.ac.uk/ 

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Cc: Rob Seaman <seaman@noao.edu>
From: Rob Seaman <seaman@noao.edu>
Subject: Re: boundaries
Date: Sat, 4 Jun 2005 23:44:08 -0700
To: semantics@ivoa.net
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> What do others think about the boundary between this group and the  
> workgroups? And what is the best way to capture that boundary in  
> the charter of the group?

The semantics forum has existed since September 2002 (and I for one  
have been receiving it since the beginning).  Prior to 4 days ago,  
there had been 91 messages in 31 months.  79 of those messages came  
in the first month and a half of the list's existence.  Over the next  
two and a half years, there were a grand total of a dozen messages.   
There have been about three dozen messages in the last few days.  Is  
it truly necessary, or desirable, to throttle back the first  
interesting discussion that comes along?  Note that the mailing list  
has a threaded archive (http://www.ivoa.net/forum/semantics) for  
those who would prefer to skip entire topics.

That said, the best way to muffle a discussion you don't want to have  
is to start an alternate discussion about something that interests  
you more.

Rob Seaman
NOAO
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<HTML><BODY style=3D"word-wrap: break-word; -khtml-nbsp-mode: space; =
-khtml-line-break: after-white-space; "><DIV><BLOCKQUOTE =
type=3D"cite"><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; ">What do others think about the =
boundary between this group and the=A0workgroups? And what is the best =
way to capture that boundary in the charter=A0of the =
group?</DIV></BLOCKQUOTE></DIV><FONT class=3D"Apple-style-span" =
color=3D"#0000DD"><DIV><BR =
class=3D"khtml-block-placeholder"></DIV></FONT><DIV><SPAN =
class=3D"Apple-style-span">The semantics forum has existed since =
September 2002 (and I for one have been receiving it since the =
beginning).=A0 Prior to 4 days ago, there had been 91 messages in 31 =
months.=A0 79 of those messages came in the first month and a half of =
the list's existence.=A0 Over the next two and a half years, there were =
a grand total of a dozen messages.=A0 There have been about three dozen =
messages in the last few days.=A0 Is it truly necessary, or desirable, =
to throttle back the first interesting discussion that comes along?=A0 =
Note that the mailing list has a threaded archive (<A =
href=3D"http://www.ivoa.net/forum/semantics">http://www.ivoa.net/forum/sem=
antics</A>)=A0</SPAN><SPAN class=3D"Apple-style-span">for those who =
would prefer to skip entire topics.</SPAN></DIV><DIV><BR =
class=3D"khtml-block-placeholder"></DIV><DIV>That said, the best way to =
muffle a discussion you don't want to have is to start an alternate =
discussion about something that interests you more.</DIV><DIV><BR =
class=3D"khtml-block-placeholder"></DIV><DIV>Rob =
Seaman</DIV><DIV>NOAO</DIV></BODY></HTML>=

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From owner-semantics@eso.org  Sun Jun  5 11:45:03 2005
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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: <semantics@ivoa.net>
Subject: RE: boundaries
Date: Sun, 5 Jun 2005 10:43:13 +0100
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Hi Rob,
 
I was not trying to throttle the discussion but asking if this was the best
place for it. As you say, this group has only recently revived. In that
revival, there's been claims from other groups that 'semantics' really
belongs to them: the ucd and dm groups have made that claim and registry and
voql could also claim the space. I want to ensure that this group does
continue because I believe it has a useful purpose in stimulating just such
discussions and more besides and that there is a need for an interest group
where conceptual discussions can reside. But we need to be able to recognise
when it is time for a discussion to be handed off to an existing specialist
workgroup.
 
So, what I was asking for were guidelines that could go into the charter
that recognise that boundaries do exist, that they will be fuzzy but that
when it is obvious that they've been crossed, we hand over to existing
workgroups or recommend that a new one be created.
 
There may be several ways that the boundary might be crossed, eg:
 
1. the sem.ig gets onto discussing how a voevent and its structure might be
accomodated within the overall AstroOntology; this discussion ends up
discussing what a voevent is and how it is distinguished from non-voevents;
we hand over to the voevent.wg for a resolution; when they've discussed and
defined the distinction we incorporate it into the conceptual ontology.
 
2. the voevent group discusses how their data model might be represented;
they create schemas and models and want to incorporate that into the
AstroOntology; they hand over what they've done to this group; we add the
voevent concepts to the overall ontology in a way that suits the way
voevents might be used and discuss ways in which this ontology might be used
by existing apps that handle voevents and by existing semantic apps that
currently do not.
 
I don't pretend that I fully (or even partially) understand the voevent
discussions taking part here and if they are mainly conceptual rather than
practical and are only about ontological distinctions then I'm happy for it
to continue. But I'd like an assurance from Roy that this is the case and
that the discussions are not better sited in his list (which is where I
assume all the voevent experts are hanging out).
 
Cheers,
Tony.


  _____  

From: owner-semantics@eso.org [mailto:owner-semantics@eso.org] On Behalf Of
Rob Seaman
Sent: 05 June 2005 07:44
To: semantics@ivoa.net
Cc: Rob Seaman
Subject: Re: boundaries



What do others think about the boundary between this group and the
workgroups? And what is the best way to capture that boundary in the charter
of the group?



The semantics forum has existed since September 2002 (and I for one have
been receiving it since the beginning). Prior to 4 days ago, there had been
91 messages in 31 months. 79 of those messages came in the first month and a
half of the list's existence. Over the next two and a half years, there were
a grand total of a dozen messages. There have been about three dozen
messages in the last few days. Is it truly necessary, or desirable, to
throttle back the first interesting discussion that comes along? Note that
the mailing list has a threaded archive
(http://www.ivoa.net/forum/semantics) for those who would prefer to skip
entire topics.

That said, the best way to muffle a discussion you don't want to have is to
start an alternate discussion about something that interests you more.

Rob Seaman
NOAO


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<BODY=20
style=3D"WORD-WRAP: break-word; khtml-nbsp-mode: space; =
khtml-line-break: after-white-space">
<DIV dir=3Dltr align=3Dleft><SPAN class=3D201301709-05062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Hi Rob,</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D201301709-05062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D201301709-05062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>I was not trying to throttle the discussion but =
asking if=20
this was the best place for it. As you say, this group has only recently =

revived. In that revival, there's been claims from other groups that =
'semantics'=20
really belongs to them: the ucd and dm groups have made that claim and =
registry=20
and voql could also claim the space. I want to ensure that this group =
does=20
continue because I believe it has a useful purpose in stimulating just =
such=20
discussions and more besides and that there is a need for an =
<STRONG>interest=20
group</STRONG> where conceptual discussions can reside. But we need to =
be able=20
to recognise when it is time for a discussion to be handed off to an=20
existing&nbsp;specialist workgroup.</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D201301709-05062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D201301709-05062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>So, what I was asking for were =
<U>guidelines</U> that could=20
go into the charter that recognise that boundaries do exist, that they =
will be=20
fuzzy but that when it is obvious that they've been crossed, we hand =
over to=20
existing workgroups or recommend that a new one be =
created.</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D201301709-05062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D201301709-05062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>There may be several ways that the boundary =
might be=20
crossed, eg:</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D201301709-05062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D201301709-05062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>1. the sem.ig gets onto discussing how a =
voevent and its=20
structure might be accomodated within the overall AstroOntology; this =
discussion=20
ends up discussing what a voevent is and how it is distinguished from=20
non-voevents; we hand over to the voevent.wg for a resolution; when =
they've=20
discussed and defined the distinction we incorporate it into the =
conceptual=20
ontology.</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D201301709-05062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D201301709-05062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>2. the voevent group discusses how their data =
model might=20
be represented; they create schemas and models and want to incorporate =
that into=20
the AstroOntology; they hand over what they've done&nbsp;to this group; =
we add=20
the voevent concepts to the overall ontology in a way that suits the way =

voevents might be used and discuss ways in which this ontology might be =
used by=20
existing apps that handle voevents and by existing semantic apps that =
currently=20
do not.</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D201301709-05062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D201301709-05062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>I don't pretend that I fully (or even =
partially) understand=20
the voevent discussions taking part here and if they are mainly =
conceptual=20
rather than practical and are only about ontological distinctions then =
I'm happy=20
for it to continue. But I'd like an assurance from Roy that this is the =
case and=20
that the discussions are not better sited in his list (which is where I =
assume=20
all the voevent experts are hanging out).</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D201301709-05062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D201301709-05062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Cheers,</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D201301709-05062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Tony.</FONT></SPAN></DIV><BR>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px =
solid; MARGIN-RIGHT: 0px">
  <DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
  <HR tabIndex=3D-1>
  <FONT face=3DTahoma size=3D2><B>From:</B> owner-semantics@eso.org=20
  [mailto:owner-semantics@eso.org] <B>On Behalf Of </B>Rob=20
  Seaman<BR><B>Sent:</B> 05 June 2005 07:44<BR><B>To:</B>=20
  semantics@ivoa.net<BR><B>Cc:</B> Rob Seaman<BR><B>Subject:</B> Re:=20
  boundaries<BR></FONT><BR></DIV>
  <DIV></DIV>
  <DIV>
  <BLOCKQUOTE type=3D"cite">
    <DIV style=3D"MARGIN: 0px">What do others think about the boundary =
between=20
    this group and the workgroups? And what is the best way to capture =
that=20
    boundary in the charter of the group?</DIV></BLOCKQUOTE></DIV><FONT=20
  class=3DApple-style-span color=3D#0000dd>
  <DIV><BR class=3Dkhtml-block-placeholder></DIV></FONT>
  <DIV><SPAN class=3DApple-style-span>The semantics forum has existed =
since=20
  September 2002 (and I for one have been receiving it since the =
beginning).=20
  Prior to 4 days ago, there had been 91 messages in 31 months. 79 of =
those=20
  messages came in the first month and a half of the list's existence. =
Over the=20
  next two and a half years, there were a grand total of a dozen =
messages. There=20
  have been about three dozen messages in the last few days. Is it truly =

  necessary, or desirable, to throttle back the first interesting =
discussion=20
  that comes along? Note that the mailing list has a threaded archive =
(<A=20
  =
href=3D"http://www.ivoa.net/forum/semantics">http://www.ivoa.net/forum/se=
mantics</A>)=20
  </SPAN><SPAN class=3DApple-style-span>for those who would prefer to =
skip entire=20
  topics.</SPAN></DIV>
  <DIV><BR class=3Dkhtml-block-placeholder></DIV>
  <DIV>That said, the best way to muffle a discussion you don't want to =
have is=20
  to start an alternate discussion about something that interests you=20
more.</DIV>
  <DIV><BR class=3Dkhtml-block-placeholder></DIV>
  <DIV>Rob Seaman</DIV>
  <DIV>NOAO</DIV></BLOCKQUOTE></BODY></HTML>

------=_NextPart_000_000A_01C569BB.602119B0--

From owner-semantics@eso.org  Sun Jun  5 13:57:45 2005
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Rob Seaman wrote:

> On Jun 4, 2005, at 7:13 AM, Ed Shaya wrote:
>
>>   I'm afraid I don't get what you are flaming about here.  Why is it 
>> possible to define a VOEvent but not an event?
>
>
> My apologies if I seemed to be flaming.  I thought we were just having 
> a conversation - expressing diverse views.
>
> A VOEvent - as Roy helpfully pointed out - is the report of an 
> observation.  Hundreds of years of scientific developments have 
> provided very fine grained utilitarian definitions of "observation" 
> and "measurement" and other experimental concepts - and of specific 
> flavor reports of same.  "Event" is a nice flexible English word - but 
> more on the theoretical side than the experimental.  In its colloquial 
> sense, the word "event" is likely broader in its connotations in 
> astronomy than in any other discipline.  I thought the point of 
> ontology was precisely to capture colloquial meanings in a bottle.  I 
> suspect "event" is one such word that will be hard to so capture.  

There is no bottle requirement.  Where one can define precisely, one 
does.  Where one can't, one does not.  The ontology will not collapse if 
the words big and little are in there.
Also, ast:event does not need to be the same as top_ont:event.  If you 
want, there can be a vo:event that is separate from ast:event.

> My worry - a worry that I've heard others express without deeming them 
> to be flaming - is that "ontology" is a synonym for "non-pragmatic".
>
We of this workgroup do hereby deem this as flaming and ban such 
expressions from this list forevermore.  All agreed, say aye.

>> Ontology allows one to use natural language to make statements and 
>> query.  The whole idea is to bring the flexibility of human language 
>> to machines (but perhaps to make it a bit clearer).  If you think 
>> this is a vain hope then why are you on this list?
>
>
> I don't think it is a vain hope to build targeted ontologies - note 
> the plural. 

Look at the VOEvent.owl.  It has no superclasses and no subclasses.  The 
properties are all hasObject where Object is simply the thing it has, 
every time.  This is what happens when you create targeted Ontologies 
that are small and not tied into overarching ontologies.   If we are to 
have a consistent vocabulary and more importantly if we are to make 
progress in our lifetimes without getting bogged down by the gridlock of 
interdependencies we need overarching ontologies first.  Afterwards we 
can go deep into specific subfields. If you look at the ontologies I've 
been working on there are targeted ontologies: physics, geometry, 
chemistry, astronomy, general science, and quantities.  Not the targets 
you had in mind.  But all quite necessary.

> 'm on the list because all of a sudden there are four or more lists 
> for discussing VO semantics and we keep being shuffled off to the next 
> list over.  VOEvent presents an interesting opportunity for the VO to 
> wrestle with real world semantic requirements.  Should this particular 
> list be renamed "ontology@ivoa.net <mailto:ontology@ivoa.net>"?

Maybe so.  It was resurrected because I was requesting an [Ontology] 
subgroup in DM.

> Can semantics be profitably pursued as an activity separate from other 
> VO work?
>
I think the idea is for this group to experiment with Ontology and when 
the benefits to the other groups are clear we will inform them.  If this 
is successful then the day may come when UCD and DM are superfluous. 
Also, there would be many uses for any good scientific ontology, so this 
work may be profitable to a much wider group than the IVOA.

>> Ah.  So what you want is inflexibility.  You want to ensure that 
>> VOEvents do not have explanations of explanations or any other deep 
>> discussion of the event.
>
>
> Not what I want at all.  Although I might suggest that "deep 
> discussion" is an emergent property from a long sequence of richly 
> braided followup packets.  To optimize its utility, a single VOEvent 
> will typically express a single coherent observation or hypothesis.  
> VOEvent is a specific VO facility with a clear mission - to report 
> alerts to the community via software agents.  In many instances, 
> VOEvents will be used to trigger more in depth analysis via other VO 
> facilities.  An "alert" and a "deep discussion" are indeed quite 
> different modes of communication.

>
>> If the VO wants hardwired structures it should study the issue with 
>> Ontologies (because only in ontologies can you see the big picture 
>> with relationships between all of the components of the langauge)  
>> and then use that as a starting point for creating limiting UML or 
>> Schema.
>
>
> "Limiting UML"?  :-)  If an ontology is something so open-ended that 
> UML is seen to be limited by comparison, then perhaps Merriam-Webster 
> is right to call ontology a branch of metaphysics.  I was just 
> standing up for ontologies the other day on one of the gazillions of 
> UCD lists.  There is little point to UCDs without an underlying 
> ontological formalism.  But by the same token, there is little point 
> to ontologies if they aren't seen to be pragmatically wrestling with 
> real world issues - at least on occasion.

> VOEvent is an opportunity for elucidating real world requirements and 
> building real world VO systems.
>
UML and Schema are limiting in the sense of providing a predefined 
structure and order.  In RDF the information can come in any order and 
the root is always RDF so one can add any desired extra information.  It 
is not clear which is more pragmatic, but if you happen to need 
structure then by all means create a schema.  You can annotate the 
schema with terms from an ontology.

> Phenomenologically yours,
>
> Rob
>
>

From owner-semantics@eso.org  Mon Jun  6 16:12:27 2005
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From: Brian Thomas <thomas@astro.umd.edu>
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On Sunday 05 June 2005 07:57 am, Ed Shaya wrote:
> > My worry - a worry that I've heard others express without deeming them 
> > to be flaming - is that "ontology" is a synonym for "non-pragmatic".
> >
> We of this workgroup do hereby deem this as flaming and ban such 
> expressions from this list forevermore.  All agreed, say aye.

	aye!!

-- 
--------------------------------------
|                                     
| Dr. Brian Thomas                    
|                                     
| Dept of Astronomy                   
| University of Maryland-College Park 
|
| Phone: (301) 405-2312               
| Fax: (301) 314-9067                 
|                                     
--------------------------------------

From owner-semantics@eso.org  Mon Jun  6 16:31:56 2005
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From: "Bernard Vatant" <bernard.vatant@mondeca.com>
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Subject: RE: some semantic puzzles from VOEvent
Date: Mon, 6 Jun 2005 16:31:15 +0200
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Hello Rob

> Bernard Vatant comments on Roy's VOEvent issues:
>
> > (1) [...]  We would like a formal vocabulary so that, for example,
> > the computer can understand that "Supernova" and "SN" are the same
> > thing..

> >> everybody knows (or thinks so) or at least implicitly agrees upon
> >> what Jupiter *is* and looks like, what a planet *is*, and so on.
> >> There is a unique (implicit) interpretation in the common
> >> (implicit) ontology.

> "Jupiter" is a proper name for a specific entity.  That
> identification is simply a definition under the control of the
> appropriate IAU committee or some other international body.

OK. When I wrote "Jupiter", I did not mean the name, but was implicitly referring to this
"entity generally agreed upon to have some sort of permanent existence as a System Solar
major component, and which is called Jupiter ... etc." My point is that, generally
speaking, given the proper context, there is not much ambiguity in the astronomical
community about the definition of this particular object.

> There is  intrinsic ambiguity, however, with the definition of classes of
> objects - with nouns that don't correspond to proper names.

Certainly, this is a general issue. Actually all efficient disambiguation processes assume
there is inter-agreement on the class(es) of objects, but this agreement is often implicit
and impossible to formalize. You have a lot of ways to identify a person among six billion
ones (e-mail address, postal address, name + birthdate + birthplace, welfare number,
passport number, ... or any combination of those to make sure). But nobody has found so
far a consensual definition of what an human *is*. Ditto for the instance "Jupiter", more
easy to define than its class "planet". Think of poor Pluto :)

> What is a planet?  What is a gas giant?  For many purposes the answers to
> these questions are obvious, something like: a gravitationally bound
> non-stellar entity orbiting a star.  (Although it quickly becomes
> obvious that all definitions depend on other definitions.)  For other
> purposes, such as the characterization of planetary atmospheres or
> magnetic fields, the precise transition from Jupiter to
> interplanetary space may be hazy indeed.

Sure : even more simple questions are tricky : what is the minimal size for a planet? for
an asteroid? for a comet? Every value would be arbitrary, although nobody I guess would
call a body of mass a few grams orbiting the Sun a planet ... All those issues boil down
to the good old undecidable question "What is the minimal number of grains to make a
sandheap?"

> > (2) [...] One report says the Event is a Supernova, another says it
> > is a SupernovaType1a, another says it is a SN and another says
> > "bright source associated with a galaxy". Are these four in agreement?
>
> >> Observer X has taken an image later interpreted as being a SN 1c
> >> in NGC 4038. Other, looking to the same sky
> >> coordinates, have obtained other data that they interpret as being
> >> images of the "same" object in the "same" galaxy (whatever this
> >> "sameness" actually means ...).
>
> I presume synonyms such as "Supernova" and "SN" will be trivial to
> handle.

Sure enough. It's plain synonymy here.

> Less trivial might the the example at the bottom of section
> 3.7 of the VOEvent specification.  The object or process that has a
> proper name of "Tycho's Stella Nova" is classified as "SN 1a".  An
> assertion is made that this is associated with the object/process
> called "3C 10" which is classified as a "supernova remnant".
> Astronomy abounds with famous objects for which large numbers of
> reliable identifications and classifications of various sorts are
> available.  We are more interested in how to classify the question
> marks - in precisely the terra incognito of the emerging ontological
> maps.  A description of the science that was current last year is not
> going to prove exceptionally helpful.  A successful ontology will be
> one that includes an easy process for growth and hypothesis.

I agree completely. That's why I insisted on the different ontological layers that seem to
be blurred in the definition of an event, or for that matter an object. And, first of all,
the process of isolating such or such pack of data from the rest of the data continuum (so
to speak) is itself on the level of interpretation. This act of separating a particular
set of data (e.g., this particular pack of photons captured by this instrument under such
and such experimental conditions) is somehow arbitrary. Why this part of the sky? Why this
part of the camera field? One could try fuzzy but generic "objective" definitions, based
on some kind of discontinuity in the data background, either space-like for an object (a
more or less steady source of light is defined as an object because the sky background is
more or less black), or space+time-like for an event or a process (the data flow changes
at some point). But such definitions would be as arbitrary as the definition of a planet
minimal size. Moreover, this separation is most of the time based on pre-existing
classification schemes. "Our eyes see light, our brains see things".

IOW, there is no object or event pre-existing to interpretation of data.

> > (3) [...] If I have a lot of VOEvent packets that refer to the same
> > astrophysical event, can I extract a SED or light-curve (or time-
> > dependent SED) by federating all the separate observations?
>
> >> As long as you put together data from different sources, the
> >> agreement about those data being about the same thing supposes an
> >> (there again, most of the time implicit) agreement on a world
> >> model where this object is supposed to "exist".
>
> I think the issue here is broader than VOEvent ...

Certainly! That's why maybe the ontology approach should not stick too much to the
specific data model of VOEvent to begin with, but incorporate this into a high-level
description of the scientific *process*.

More to come ...

Bernard

**********************************************************************************

Bernard Vatant
Senior Consultant
Knowledge Engineering
bernard.vatant@mondeca.com

"Making Sense of Content" :  http://www.mondeca.com
"Everything is a Subject" :  http://universimmedia.blogspot.com

**********************************************************************************



From owner-semantics@eso.org  Mon Jun  6 16:44:28 2005
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From: "Bernard Vatant" <bernard.vatant@mondeca.com>
To: <semantics@ivoa.net>
Subject: RE: some remarks on VOEvent
Date: Mon, 6 Jun 2005 16:43:55 +0200
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... to follow-up with my previous message ...

Roy Williams wrote :

> More properly we should *not* say VOEvent represents an astrophysical
> event, but rather it represents an *observation* of an event. Each
> observation is assigned an ID.

Agreed, iff "an *observation* of an event" is not taken in a naive realistic view of the
world, a la ...

1. There was an event to observe (outthere, independently of mine, or any other,
observation)
2. I was there, lucky man/woman to catch it : see my data.

... but puts the observation first, and then the event definition, a la :

1. I happened to capture this pack of data.
2. They seem to make together enough sense, according to my/our current knowledge - or
still better, to our *lack* of knowledge - to be encapsulated inside an "event box".
3. My first interpretation is bla bla ...

Bernard

**********************************************************************************

Bernard Vatant
Senior Consultant
Knowledge Engineering
bernard.vatant@mondeca.com

"Making Sense of Content" :  http://www.mondeca.com
"Everything is a Subject" :  http://universimmedia.blogspot.com

**********************************************************************************


From owner-semantics@eso.org  Mon Jun  6 17:55:57 2005
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From: Ed Shaya <edward.j.shaya.1@gsfc.nasa.gov>
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Bernard,
    I agree with this also.  Doesn't this all mean that VOEvent should 
hasObservation?  Shouldn't we be working with Jonathan's UML of an 
Observation to create that Ontology first.  Most of what is in the  
VOEvent presented at the last NVO meeting is like Observation but done 
in a different way.   I could understand wanting a simpler format for 
Observation but the better way to provide that is to have restrictions 
on Observation.  Perhaps there can be a SimpleFormatObservation subclass 
of Observation.
    I would think a VOEvent could take multiple Observations.  For 
instance, one day one has images and spectra and then three days later 
one has more images and spectra.   One notices significant changes in 
both so you send out a VOEvent. Are there 4 Observations or 1?  And what 
if you include supporting Observations by a colleague at another 
observatory?

Ed

Bernard Vatant wrote:

>.... to follow-up with my previous message ...
>
>Roy Williams wrote :
>
>  
>
>>More properly we should *not* say VOEvent represents an astrophysical
>>event, but rather it represents an *observation* of an event. Each
>>observation is assigned an ID.
>>    
>>
>
>Agreed, iff "an *observation* of an event" is not taken in a naive realistic view of the
>world, a la ...
>
>1. There was an event to observe (outthere, independently of mine, or any other,
>observation)
>2. I was there, lucky man/woman to catch it : see my data.
>
>.... but puts the observation first, and then the event definition, a la :
>
>1. I happened to capture this pack of data.
>2. They seem to make together enough sense, according to my/our current knowledge - or
>still better, to our *lack* of knowledge - to be encapsulated inside an "event box".
>3. My first interpretation is bla bla ...
>
>Bernard
>
>**********************************************************************************
>
>Bernard Vatant
>Senior Consultant
>Knowledge Engineering
>bernard.vatant@mondeca.com
>
>"Making Sense of Content" :  http://www.mondeca.com
>"Everything is a Subject" :  http://universimmedia.blogspot.com
>
>**********************************************************************************
>
>
>
>  
>

From owner-semantics@eso.org  Mon Jun  6 18:01:35 2005
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From: Elizabeth Auden <eca@mssl.ucl.ac.uk>
To: semantics@ivoa.net
Subject: Re: some remarks on VOEvent
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>   I would think a VOEvent could take multiple Observations.  For instance, 
> one day one has images and spectra and then three days later one has more 
> images and spectra.   One notices significant changes in both so you send out 
> a VOEvent. Are there 4 Observations or 1?  And what if you include supporting 
> Observations by a colleague at another observatory?

Swift provides a good example of this - when MSSL has round-the-clock 
gamma-ray burst duty, part of the responsibilities include coordinating 
other instruments for multi-wavelength observations of the afterglow.

Elizabeth

From owner-semantics@eso.org  Mon Jun  6 18:06:44 2005
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And if one wants to autoconvert UML to OWL there is this tool at

http://afrodita.rcub.bg.ac.yu/~gasevic/projects/UMLtoOWL/


      UMLtoOWL: Converter from UML to OWL

 


      General information

The UMLtoOWL tool converts extended Ontology UML Profile (OUP) models in 
XML Metadata Interchange (XMI) format to The Web Ontology Language (OWL) 
<http://www.w3.org/TR/2004/REC-owl-ref-20040210> ontologies. The tool is 
implemented by using eXtensible Stylesheet Language Transformation 
(XSLT). With UMLtoOWL we do not need to modify the existing UML tools. A 
UML tool can export an XMI document that an XSLT processor (e.g. Xalan 
Java 2 <http://xml.apache.org/xalan-j/index.html>) can use as input. An 
OWL document is produced as the output, and this format can be imported 
into a tool specialized for ontology development (e.g. Protégé 
<http://protege.stanford.edu/>) where it can be further refined.

This work is a part of the Good Old AI <http://goodoldai.org.yu/> 
research effort to develop an MDA based ontology infrastructure 
<http://www.comsis.fon.bg.ac.yu/ComSISpdf/Volume01/Papers/DraganDjuric.pdf>.

Ed




Bernard Vatant wrote:

>.... to follow-up with my previous message ...
>
>Roy Williams wrote :
>
>  
>
>>More properly we should *not* say VOEvent represents an astrophysical
>>event, but rather it represents an *observation* of an event. Each
>>observation is assigned an ID.
>>    
>>
>
>Agreed, iff "an *observation* of an event" is not taken in a naive realistic view of the
>world, a la ...
>
>1. There was an event to observe (outthere, independently of mine, or any other,
>observation)
>2. I was there, lucky man/woman to catch it : see my data.
>
>.... but puts the observation first, and then the event definition, a la :
>
>1. I happened to capture this pack of data.
>2. They seem to make together enough sense, according to my/our current knowledge - or
>still better, to our *lack* of knowledge - to be encapsulated inside an "event box".
>3. My first interpretation is bla bla ...
>
>Bernard
>
>**********************************************************************************
>
>Bernard Vatant
>Senior Consultant
>Knowledge Engineering
>bernard.vatant@mondeca.com
>
>"Making Sense of Content" :  http://www.mondeca.com
>"Everything is a Subject" :  http://universimmedia.blogspot.com
>
>**********************************************************************************
>
>
>
>  
>

From owner-semantics@eso.org  Mon Jun  6 18:43:47 2005
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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: <semantics@ivoa.net>
Subject: RE: some remarks on VOEvent
Date: Mon, 6 Jun 2005 17:43:23 +0100
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Ooohhh!!  Toys!!  Finally something *I* can understand :)

Now, anyone got an ontology-friendly UML tool?

T. 

> -----Original Message-----
> From: owner-semantics@eso.org 
> [mailto:owner-semantics@eso.org] On Behalf Of Ed Shaya
> Sent: 06 June 2005 17:06
> To: semantics@ivoa.net
> Subject: Re: some remarks on VOEvent
> 
> And if one wants to autoconvert UML to OWL there is this tool at
> 
> http://afrodita.rcub.bg.ac.yu/~gasevic/projects/UMLtoOWL/
> 
> 
>       UMLtoOWL: Converter from UML to OWL
> 
>  
> 
> 
>       General information
> 
> The UMLtoOWL tool converts extended Ontology UML Profile 
> (OUP) models in XML Metadata Interchange (XMI) format to The 
> Web Ontology Language (OWL) 
> <http://www.w3.org/TR/2004/REC-owl-ref-20040210> ontologies. 
> The tool is implemented by using eXtensible Stylesheet 
> Language Transformation (XSLT). With UMLtoOWL we do not need 
> to modify the existing UML tools. A UML tool can export an 
> XMI document that an XSLT processor (e.g. Xalan Java 2 
> <http://xml.apache.org/xalan-j/index.html>) can use as input. 
> An OWL document is produced as the output, and this format 
> can be imported into a tool specialized for ontology 
> development (e.g. Protégé
> <http://protege.stanford.edu/>) where it can be further refined.
> 
> This work is a part of the Good Old AI 
> <http://goodoldai.org.yu/> research effort to develop an MDA 
> based ontology infrastructure 
> <http://www.comsis.fon.bg.ac.yu/ComSISpdf/Volume01/Papers/Drag
> anDjuric.pdf>.
> 
> Ed
> 
> 
> 
> 
> Bernard Vatant wrote:
> 
> >.... to follow-up with my previous message ...
> >
> >Roy Williams wrote :
> >
> >  
> >
> >>More properly we should *not* say VOEvent represents an 
> astrophysical 
> >>event, but rather it represents an *observation* of an event. Each 
> >>observation is assigned an ID.
> >>    
> >>
> >
> >Agreed, iff "an *observation* of an event" is not taken in a naive 
> >realistic view of the world, a la ...
> >
> >1. There was an event to observe (outthere, independently of 
> mine, or 
> >any other,
> >observation)
> >2. I was there, lucky man/woman to catch it : see my data.
> >
> >.... but puts the observation first, and then the event 
> definition, a la :
> >
> >1. I happened to capture this pack of data.
> >2. They seem to make together enough sense, according to 
> my/our current 
> >knowledge - or still better, to our *lack* of knowledge - to 
> be encapsulated inside an "event box".
> >3. My first interpretation is bla bla ...
> >
> >Bernard
> >
> >*************************************************************
> **********
> >***********
> >
> >Bernard Vatant
> >Senior Consultant
> >Knowledge Engineering
> >bernard.vatant@mondeca.com
> >
> >"Making Sense of Content" :  http://www.mondeca.com "Everything is a 
> >Subject" :  http://universimmedia.blogspot.com
> >
> >*************************************************************
> **********
> >***********
> >
> >
> >
> >  
> >
> 
> 


From owner-semantics@eso.org  Mon Jun  6 19:06:47 2005
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Date: Mon, 06 Jun 2005 13:06:21 -0400
From: Ed Shaya <edward.j.shaya.1@gsfc.nasa.gov>
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The Poseiden UML tool has been tested with the ontology UML Profile and 
metamodel (for a description see:
http://www.metamodel.com/wisme-2004/present/9.pdf).  Apparently, you can 
not take a standard UML and just transform it to OWL.  One needs to 
incorporate the profile and metamodel first.

Ed


Tony Linde wrote:

>Ooohhh!!  Toys!!  Finally something *I* can understand :)
>
>Now, anyone got an ontology-friendly UML tool?
>
>T. 
>
>  
>
>>-----Original Message-----
>>From: owner-semantics@eso.org 
>>[mailto:owner-semantics@eso.org] On Behalf Of Ed Shaya
>>Sent: 06 June 2005 17:06
>>To: semantics@ivoa.net
>>Subject: Re: some remarks on VOEvent
>>
>>And if one wants to autoconvert UML to OWL there is this tool at
>>
>>http://afrodita.rcub.bg.ac.yu/~gasevic/projects/UMLtoOWL/
>>
>>
>>      UMLtoOWL: Converter from UML to OWL
>>
>> 
>>
>>
>>      General information
>>
>>The UMLtoOWL tool converts extended Ontology UML Profile 
>>(OUP) models in XML Metadata Interchange (XMI) format to The 
>>Web Ontology Language (OWL) 
>><http://www.w3.org/TR/2004/REC-owl-ref-20040210> ontologies. 
>>The tool is implemented by using eXtensible Stylesheet 
>>Language Transformation (XSLT). With UMLtoOWL we do not need 
>>to modify the existing UML tools. A UML tool can export an 
>>XMI document that an XSLT processor (e.g. Xalan Java 2 
>><http://xml.apache.org/xalan-j/index.html>) can use as input. 
>>An OWL document is produced as the output, and this format 
>>can be imported into a tool specialized for ontology 
>>development (e.g. Protégé
>><http://protege.stanford.edu/>) where it can be further refined.
>>
>>This work is a part of the Good Old AI 
>><http://goodoldai.org.yu/> research effort to develop an MDA 
>>based ontology infrastructure 
>><http://www.comsis.fon.bg.ac.yu/ComSISpdf/Volume01/Papers/Drag
>>anDjuric.pdf>.
>>
>>Ed
>>
>>
>>
>>
>>Bernard Vatant wrote:
>>
>>    
>>
>>>.... to follow-up with my previous message ...
>>>
>>>Roy Williams wrote :
>>>
>>> 
>>>
>>>      
>>>
>>>>More properly we should *not* say VOEvent represents an 
>>>>        
>>>>
>>astrophysical 
>>    
>>
>>>>event, but rather it represents an *observation* of an event. Each 
>>>>observation is assigned an ID.
>>>>   
>>>>
>>>>        
>>>>
>>>Agreed, iff "an *observation* of an event" is not taken in a naive 
>>>realistic view of the world, a la ...
>>>
>>>1. There was an event to observe (outthere, independently of 
>>>      
>>>
>>mine, or 
>>    
>>
>>>any other,
>>>observation)
>>>2. I was there, lucky man/woman to catch it : see my data.
>>>
>>>.... but puts the observation first, and then the event 
>>>      
>>>
>>definition, a la :
>>    
>>
>>>1. I happened to capture this pack of data.
>>>2. They seem to make together enough sense, according to 
>>>      
>>>
>>my/our current 
>>    
>>
>>>knowledge - or still better, to our *lack* of knowledge - to 
>>>      
>>>
>>be encapsulated inside an "event box".
>>    
>>
>>>3. My first interpretation is bla bla ...
>>>
>>>Bernard
>>>
>>>*************************************************************
>>>      
>>>
>>**********
>>    
>>
>>>***********
>>>
>>>Bernard Vatant
>>>Senior Consultant
>>>Knowledge Engineering
>>>bernard.vatant@mondeca.com
>>>
>>>"Making Sense of Content" :  http://www.mondeca.com "Everything is a 
>>>Subject" :  http://universimmedia.blogspot.com
>>>
>>>*************************************************************
>>>      
>>>
>>**********
>>    
>>
>>>***********
>>>
>>>
>>>
>>> 
>>>
>>>      
>>>
>>    
>>
>
>
>
>  
>

From owner-semantics@eso.org  Mon Jun  6 19:20:01 2005
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From: Rob Seaman <seaman@noao.edu>
Subject: Re: some semantic puzzles from VOEvent
Date: Mon, 6 Jun 2005 10:18:58 -0700
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On Jun 6, 2005, at 7:31 AM, Bernard Vatant wrote:

> nobody has found so far a consensual definition of what an human *is*.

Actually, we have an excellent operational definition of "human" (in  
its meaning as a synonym for Homo sapiens).  A human is an  
interbreeding (hypothetically or actually) descendent of humans.   
Combine that rule with an example entity deemed to be human and stir  
inductively.  The point here is that evolution serves as a unifying  
force in constructing biological ontologies.  Astronomy has no  
similar unifying conceptual framework above the level of fundamental  
physics.

> even more simple questions are tricky : what is the minimal size  
> for a planet? for an asteroid? for a comet? Every value would be  
> arbitrary, although nobody I guess would call a body of mass a few  
> grams orbiting the Sun a planet ... All those issues boil down to  
> the good old undecidable question "What is the minimal number of  
> grains to make a sandheap?"

Yes, but I question your assertion that these questions are  
undecidable.  The literature is rife with variations on ways to  
express size distributions (e.g., initial mass functions) that would  
allow capturing such subtleties.  Does "natural language" include the  
mathematical expressions that are the natural way to express so many  
astronomical concepts?  Does knowledge engineering extend to actually  
expressing an HR diagram - or would Ejnar and Henry simply have to  
describe the main sequence in prose - or perhaps poetry?  "I think I  
shall never see, a poem as lovely as the asymptotic giant branch."

Rob

From owner-semantics@eso.org  Mon Jun  6 19:28:21 2005
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There is a plugin for Protege to go the other direction, OWL to UML (XMI 
1.4), see
http://protege.stanford.edu/plugins/uml/

But also see the caveats:
http://protege.stanford.edu/plugins/uml/mapping.html

Ed

Tony Linde wrote:

>Ooohhh!!  Toys!!  Finally something *I* can understand :)
>
>Now, anyone got an ontology-friendly UML tool?
>
>T. 
>
>  
>
>>-----Original Message-----
>>From: owner-semantics@eso.org 
>>[mailto:owner-semantics@eso.org] On Behalf Of Ed Shaya
>>Sent: 06 June 2005 17:06
>>To: semantics@ivoa.net
>>Subject: Re: some remarks on VOEvent
>>
>>And if one wants to autoconvert UML to OWL there is this tool at
>>
>>http://afrodita.rcub.bg.ac.yu/~gasevic/projects/UMLtoOWL/
>>
>>
>>      UMLtoOWL: Converter from UML to OWL
>>
>> 
>>
>>
>>      General information
>>
>>The UMLtoOWL tool converts extended Ontology UML Profile 
>>(OUP) models in XML Metadata Interchange (XMI) format to The 
>>Web Ontology Language (OWL) 
>><http://www.w3.org/TR/2004/REC-owl-ref-20040210> ontologies. 
>>The tool is implemented by using eXtensible Stylesheet 
>>Language Transformation (XSLT). With UMLtoOWL we do not need 
>>to modify the existing UML tools. A UML tool can export an 
>>XMI document that an XSLT processor (e.g. Xalan Java 2 
>><http://xml.apache.org/xalan-j/index.html>) can use as input. 
>>An OWL document is produced as the output, and this format 
>>can be imported into a tool specialized for ontology 
>>development (e.g. Protégé
>><http://protege.stanford.edu/>) where it can be further refined.
>>
>>This work is a part of the Good Old AI 
>><http://goodoldai.org.yu/> research effort to develop an MDA 
>>based ontology infrastructure 
>><http://www.comsis.fon.bg.ac.yu/ComSISpdf/Volume01/Papers/Drag
>>anDjuric.pdf>.
>>
>>Ed
>>
>>
>>
>>
>>Bernard Vatant wrote:
>>
>>    
>>
>>>.... to follow-up with my previous message ...
>>>
>>>Roy Williams wrote :
>>>
>>> 
>>>
>>>      
>>>
>>>>More properly we should *not* say VOEvent represents an 
>>>>        
>>>>
>>astrophysical 
>>    
>>
>>>>event, but rather it represents an *observation* of an event. Each 
>>>>observation is assigned an ID.
>>>>   
>>>>
>>>>        
>>>>
>>>Agreed, iff "an *observation* of an event" is not taken in a naive 
>>>realistic view of the world, a la ...
>>>
>>>1. There was an event to observe (outthere, independently of 
>>>      
>>>
>>mine, or 
>>    
>>
>>>any other,
>>>observation)
>>>2. I was there, lucky man/woman to catch it : see my data.
>>>
>>>.... but puts the observation first, and then the event 
>>>      
>>>
>>definition, a la :
>>    
>>
>>>1. I happened to capture this pack of data.
>>>2. They seem to make together enough sense, according to 
>>>      
>>>
>>my/our current 
>>    
>>
>>>knowledge - or still better, to our *lack* of knowledge - to 
>>>      
>>>
>>be encapsulated inside an "event box".
>>    
>>
>>>3. My first interpretation is bla bla ...
>>>
>>>Bernard
>>>
>>>*************************************************************
>>>      
>>>
>>**********
>>    
>>
>>>***********
>>>
>>>Bernard Vatant
>>>Senior Consultant
>>>Knowledge Engineering
>>>bernard.vatant@mondeca.com
>>>
>>>"Making Sense of Content" :  http://www.mondeca.com "Everything is a 
>>>Subject" :  http://universimmedia.blogspot.com
>>>
>>>*************************************************************
>>>      
>>>
>>**********
>>    
>>
>>>***********
>>>
>>>
>>>
>>> 
>>>
>>>      
>>>
>>    
>>
>
>
>
>  
>

From owner-semantics@eso.org  Tue Jun  7 01:28:43 2005
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From: "Bernard Vatant" <bernard.vatant@mondeca.com>
To: <semantics@ivoa.net>
Subject: RE: some semantic puzzles from VOEvent
Date: Tue, 7 Jun 2005 01:28:06 +0200
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Rob

> > nobody has found so far a consensual definition of what an human *is*.
>
> Actually, we have an excellent operational definition of "human" (in
> its meaning as a synonym for Homo sapiens).  A human is an
> interbreeding (hypothetically or actually) descendent of humans.
> Combine that rule with an example entity deemed to be human and stir
> inductively.

Cool. I love recursive definitions :)
That one is certainly operational - fit for everyday life affairs. But to provide a
scientific definition of human kind as a species, forget it, it's easily broken ...
1. Species historical limits : If every human is a descendent of humans, recursively, hmm,
I would be happy to trace my ancestors back to, say, 200 millions years ago, and meet them
one by one - just to check the humanity breaking point ... Not to mention my descendents
200 millions years from now ... if any ...
Seriously, there is a fuzzy border somewhere. "When in Earth history did humanity begin?"
is a question exactly similar to : "When in Universe history did galaxies appear"?
2. For each individual : When do I start/end my story as an human? Think about difficult
and endless debates about abortion and euthanasia. As difficult as : When does the Sun
starts/ends as a star ... No more, no less ... And not to mention monsters of all kinds,
that make wonder about limits of humanity ...

And this goes along the lines of the point you made a few messages up in this thread :
interesting science happens on the borders of agreed upon ontology. Is this a star or not?
Is this an human or not? even in "pure" maths : Is this a line? Is this a number? Is this
a function? Such questions led to the most important advances in every domain of science.

> The point here is that evolution serves as a unifying
> force in constructing biological ontologies.

Well, evolution gives a framework for biological taxonomy construction, yes ... but
nevertheless ... the differentiation breaking point of a species is still something very
difficult to define, and hard to observe. I won't elaborate on the details here, but I had
an interesting breakfast with a botanist a while ago, which definitely destroyed in my
mind the notion of any "objective" definition of what a species is ...

> Astronomy has no similar unifying conceptual framework
> above the level of fundamental physics.

True, maybe, but such "unifying conceptual framework" would not solve the above issues,
more than evolution did in Biology.

> > even more simple questions are tricky : what is the minimal size
> > for a planet? for an asteroid? for a comet? Every value would be
> > arbitrary, although nobody I guess would call a body of mass a few
> > grams orbiting the Sun a planet ... All those issues boil down to
> > the good old undecidable question "What is the minimal number of
> > grains to make a sandheap?"
>
> Yes, but I question your assertion that these questions are
> undecidable.

"Undecidable" was not adequate a word, I agree, if you read it in its strict logical
sense. I mean you can chose any arbitrary limit, like geographs do for the classification
of cities, by setting arbitrary population thresholds ...

> The literature is rife with variations on ways to
> express size distributions (e.g., initial mass functions) that would
> allow capturing such subtleties.  Does "natural language" include the
> mathematical expressions that are the natural way to express so many
> astronomical concepts?

Depends on what you call "natural language". Not sure if it contains any mathematical
expressions at all ...

> Does knowledge engineering extend to actually
> expressing an HR diagram - or would Ejnar and Henry simply have to
> describe the main sequence in prose - or perhaps poetry?  "I think I
> shall never see, a poem as lovely as the asymptotic giant branch."

This is an interesting challenge indeed ...

Bernard

**********************************************************************************

Bernard Vatant
Senior Consultant
Knowledge Engineering
bernard.vatant@mondeca.com

"Making Sense of Content" :  http://www.mondeca.com
"Everything is a Subject" :  http://universimmedia.blogspot.com

**********************************************************************************


From owner-semantics@eso.org  Tue Jun  7 08:46:35 2005
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Cc: Rob Seaman <seaman@noao.edu>
From: Rob Seaman <seaman@noao.edu>
Subject: More obscure analogies
Date: Mon, 6 Jun 2005 23:45:46 -0700
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On Jun 6, 2005, at 4:28 PM, Bernard Vatant wrote:

> Cool. I love recursive definitions :)  That one is certainly  
> operational - fit for everyday life affairs. But to provide a  
> scientific definition of human kind as a species, forget it, it's  
> easily broken ...

Actually, I think it is fairly close to what would be regarded as the  
current "scientific definition".  More to the point, it isn't clear  
that "everyday" and "scientific" definitions are, or should be,  
different.  Certainly complexity of expression doesn't equal depth of  
understanding.

> I would be happy to trace my ancestors back to, say, 200 millions  
> years ago, and meet them one by one - just to check the humanity  
> breaking point

But evolution contains the context for addressing these issues, too.   
Our most recent common ancestor with chimpanzees was something like  
seven million years ago. See Richard Dawkins' fabulous "Ancestor's  
Tale".

> ... Not to mention my descendents 200 millions years from now

It may indeed be impossible to describe entities that do not yet exist.

> "When in Earth history did humanity begin?" is a question exactly  
> similar to : "When in Universe history did galaxies appear"?

Well, no.  The underlying "equations of state", if you will, are very  
different.  Galactic evolution is evolution in name only.  You've  
already pointed out the chicken and egg problem for biological  
entities.  Life is a rich binary tree of cousins - many branch  
points, many "buds".  Galaxies were always galaxies.  Before that,  
they were only proto-galaxies.  Our non-human ancestors had their own  
identities - they were never "proto-humans".  One would be more  
correct to compare the first galaxies to the appearance of the first  
eukaryotic cell, perhaps - but even then the complexity of the web of  
life is both greater (in variety) and less (in the knowledge  
compression of evolutionary genetics) than that of "mere" astronomy.

> a species is still something very difficult to define, and hard to  
> observe. I won't elaborate on the details here, but I had an  
> interesting breakfast with a botanist a while ago, which definitely  
> destroyed in my mind the notion of any "objective" definition of  
> what a species is ...

It may not be surprising that the taxonomy of Linnaeus may need  
tweeking after 250 years.  The notion of a species is quite different  
- perhaps nonexistent - for entities that reproduce asexually.  See  
http://ucjeps.berkeley.edu/map2.html.

> "Undecidable" was not adequate a word, I agree, if you read it in  
> its strict logical sense. I mean you can chose any arbitrary limit,  
> like geographs do for the classification of cities, by setting  
> arbitrary population thresholds ...

But "city" is an arbitrary notion.  "Human" and "Galaxy" have  
intrinsic meaning, no matter how difficult to pin down.  My original  
comments were specifically about the word "event".  An event is not  
only an arbitrary notion - it is a whole constellation of arbitrary  
notions.

Rob Seaman
NOAO
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<HTML><BODY style=3D"word-wrap: break-word; -khtml-nbsp-mode: space; =
-khtml-line-break: after-white-space; "><DIV><DIV>On Jun 6, 2005, at =
4:28 PM, Bernard Vatant wrote:</DIV><BR =
class=3D"Apple-interchange-newline"><BLOCKQUOTE type=3D"cite"><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; ">Cool. I love recursive definitions :)=A0=A0That one =
is certainly operational - fit for everyday life affairs. But to provide =
a=A0scientific definition of human kind as a species, forget it, it's =
easily broken ...</DIV></BLOCKQUOTE><DIV><BR =
class=3D"khtml-block-placeholder"></DIV>Actually, I think it is fairly =
close to what would be regarded as the current "scientific=A0definition".=A0=
 More to the point, it isn't clear that "everyday" and "scientific" =
definitions=A0are, or should be, different.=A0 Certainly complexity of =
expression doesn't equal depth of =
understanding.</DIV><DIV><BR><BLOCKQUOTE type=3D"cite"><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; ">I would be happy to trace my ancestors back to, say, =
200 millions years ago, and meet them=A0one by one - just to check the =
humanity breaking point</DIV></BLOCKQUOTE><DIV><BR =
class=3D"khtml-block-placeholder"></DIV>But evolution contains the =
context for addressing these issues, too.=A0 Our most recent common =
ancestor with chimpanzees was something like seven million years ago. =
See Richard Dawkins' fabulous "Ancestor's Tale".</DIV><DIV><BR =
class=3D"khtml-block-placeholder"></DIV><DIV><BLOCKQUOTE =
type=3D"cite"><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; "> ... Not to mention my =
descendents=A0200 millions years from now</DIV></BLOCKQUOTE><DIV><BR =
class=3D"khtml-block-placeholder"></DIV>It may indeed be impossible to =
describe entities that do not yet exist.</DIV><DIV><BR><BLOCKQUOTE =
type=3D"cite"><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; ">"When in Earth history did =
humanity begin?"=A0is a question exactly similar to : "When in Universe =
history did galaxies appear"?</DIV></BLOCKQUOTE><DIV><BR =
class=3D"khtml-block-placeholder"></DIV>Well, no.=A0 The underlying =
"equations of state", if you will, are very different.=A0 Galactic =
evolution is evolution in name only.=A0 You've already pointed out the =
chicken and egg problem for biological entities.=A0 Life is a rich =
binary tree of cousins - many branch points, many "buds".=A0 Galaxies =
were always galaxies.=A0 Before that, they were only proto-galaxies. =
=A0Our non-human ancestors had their own identities - they were never =
"proto-humans". =A0One would be more correct to compare the first =
galaxies to the appearance of the first eukaryotic cell, perhaps - but =
even then the complexity of the web of life is both greater (in variety) =
and less (in the knowledge compression of evolutionary genetics) than =
that of "mere" astronomy.</DIV><DIV><BR><BLOCKQUOTE type=3D"cite"><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; ">a species is still something very=A0difficult to =
define, and hard to observe. I won't elaborate on the details here, but =
I had=A0an interesting breakfast with a botanist a while ago, which =
definitely destroyed in my=A0mind the notion of any "objective" =
definition of what a species is ...</DIV></BLOCKQUOTE><DIV><BR =
class=3D"khtml-block-placeholder"></DIV><FONT class=3D"Apple-style-span" =
face=3D"Arial" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;">It may not be surprising that the taxonomy of =
Linnaeus may need tweeking after 250 years.=A0 The notion of a species =
is quite different - perhaps nonexistent - for entities that reproduce =
asexually.=A0 See<FONT class=3D"Apple-style-span" face=3D"Helvetica" =
size=3D"3"><SPAN class=3D"Apple-style-span" style=3D"font-size: =
12px;">=A0<A =
href=3D"http://ucjeps.berkeley.edu/map2.html">http://ucjeps.berkeley.edu/m=
ap2.html</A>.</SPAN></FONT></SPAN></FONT></DIV><DIV><FONT =
class=3D"Apple-style-span" face=3D"Arial" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: =
13px;"><BR></SPAN></FONT><BLOCKQUOTE =
type=3D"cite"></BLOCKQUOTE><BLOCKQUOTE type=3D"cite"><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; ">"Undecidable" was not adequate a word, I agree, if =
you read it in its strict logical=A0sense. I mean you can chose any =
arbitrary limit, like geographs do for the classification=A0of cities, =
by setting arbitrary population thresholds =
...</DIV></BLOCKQUOTE></DIV><FONT class=3D"Apple-style-span" =
color=3D"#0000DD"></FONT><DIV><FONT class=3D"Apple-style-span" =
color=3D"#0000DD"><BR =
class=3D"khtml-block-placeholder"></FONT></DIV><DIV><FONT =
class=3D"Apple-style-span" color=3D"#000000">But "city" is an arbitrary =
notion.=A0 "Human" and "Galaxy" have intrinsic meaning, no matter how =
difficult to pin down.=A0 My original comments were specifically about =
the word "event".=A0 An event is not only an arbitrary notion - it is a =
whole constellation of arbitrary notions.</FONT></DIV><DIV><BR =
class=3D"khtml-block-placeholder"></DIV><DIV><FONT =
class=3D"Apple-style-span" color=3D"#000000">Rob =
Seaman</FONT></DIV><DIV><FONT class=3D"Apple-style-span" =
color=3D"#000000">NOAO</FONT></DIV></BODY></HTML>=

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From owner-semantics@eso.org  Tue Jun  7 11:40:54 2005
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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: <semantics@ivoa.net>
Subject: RE: More obscure analogies
Date: Tue, 7 Jun 2005 10:40:26 +0100
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Maybe we should rename this group the 'VO Philosophy' IG? :)
 
<<My original comments were specifically about the word "event". An event is
not only an arbitrary notion - it is a whole constellation of arbitrary
notions.>>
 
Surely, from the sem.ig point of view, we need to focus on what the voevent
ontology will be *used* for and then look at the entities and relationships
we need to define for that. Let's keep things simple and focussed to start
with and then evolve (sexually and asexually) the ontologies as new
applications or needs arise.
 
Do we have any use cases for a voevent ontology?
 
Cheers,
Tony.


  _____  

From: owner-semantics@eso.org [mailto:owner-semantics@eso.org] On Behalf Of
Rob Seaman
Sent: 07 June 2005 07:46
To: semantics@ivoa.net
Cc: Rob Seaman
Subject: More obscure analogies


On Jun 6, 2005, at 4:28 PM, Bernard Vatant wrote:


Cool. I love recursive definitions :) That one is certainly operational -
fit for everyday life affairs. But to provide a scientific definition of
human kind as a species, forget it, it's easily broken ...


Actually, I think it is fairly close to what would be regarded as the
current "scientific definition". More to the point, it isn't clear that
"everyday" and "scientific" definitions are, or should be, different.
Certainly complexity of expression doesn't equal depth of understanding.


I would be happy to trace my ancestors back to, say, 200 millions years ago,
and meet them one by one - just to check the humanity breaking point


But evolution contains the context for addressing these issues, too. Our
most recent common ancestor with chimpanzees was something like seven
million years ago. See Richard Dawkins' fabulous "Ancestor's Tale".


... Not to mention my descendents 200 millions years from now


It may indeed be impossible to describe entities that do not yet exist.


"When in Earth history did humanity begin?" is a question exactly similar to
: "When in Universe history did galaxies appear"?


Well, no. The underlying "equations of state", if you will, are very
different. Galactic evolution is evolution in name only. You've already
pointed out the chicken and egg problem for biological entities. Life is a
rich binary tree of cousins - many branch points, many "buds". Galaxies were
always galaxies. Before that, they were only proto-galaxies. Our non-human
ancestors had their own identities - they were never "proto-humans". One
would be more correct to compare the first galaxies to the appearance of the
first eukaryotic cell, perhaps - but even then the complexity of the web of
life is both greater (in variety) and less (in the knowledge compression of
evolutionary genetics) than that of "mere" astronomy.


a species is still something very difficult to define, and hard to observe.
I won't elaborate on the details here, but I had an interesting breakfast
with a botanist a while ago, which definitely destroyed in my mind the
notion of any "objective" definition of what a species is ...


It may not be surprising that the taxonomy of Linnaeus may need tweeking
after 250 years. The notion of a species is quite different - perhaps
nonexistent - for entities that reproduce asexually. See
http://ucjeps.berkeley.edu/map2.html.



"Undecidable" was not adequate a word, I agree, if you read it in its strict
logical sense. I mean you can chose any arbitrary limit, like geographs do
for the classification of cities, by setting arbitrary population thresholds
...




But "city" is an arbitrary notion. "Human" and "Galaxy" have intrinsic
meaning, no matter how difficult to pin down. My original comments were
specifically about the word "event". An event is not only an arbitrary
notion - it is a whole constellation of arbitrary notions.

Rob Seaman
NOAO


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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Dus-ascii">
<META content=3D"MSHTML 6.00.2900.2627" name=3DGENERATOR></HEAD>
<BODY=20
style=3D"WORD-WRAP: break-word; khtml-nbsp-mode: space; =
khtml-line-break: after-white-space">
<DIV dir=3Dltr align=3Dleft><SPAN class=3D416113609-07062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Maybe we should rename this group the 'VO =
Philosophy' IG?=20
:)</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D416113609-07062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D416113609-07062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>&lt;&lt;<FONT face=3D"Times New Roman" =
color=3D#000000=20
size=3D3>My original comments were specifically about the word "event". =
An event=20
is not only an arbitrary notion - it is a whole constellation of =
arbitrary=20
notions.</FONT>&gt;&gt;</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D416113609-07062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D416113609-07062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Surely, from the sem.ig point of view, we need =
to focus on=20
what the voevent ontology will be *used* for and then look at the =
entities and=20
relationships we need to define for that. Let's keep things simple and =
focussed=20
to start with and then evolve (sexually&nbsp;and asexually) the =
ontologies as=20
new applications or needs&nbsp;arise.</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D416113609-07062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D416113609-07062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Do we have any use cases for a voevent=20
ontology?</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D416113609-07062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D416113609-07062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Cheers,</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D416113609-07062005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Tony.</FONT></SPAN></DIV><BR>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px =
solid; MARGIN-RIGHT: 0px">
  <DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
  <HR tabIndex=3D-1>
  <FONT face=3DTahoma size=3D2><B>From:</B> owner-semantics@eso.org=20
  [mailto:owner-semantics@eso.org] <B>On Behalf Of </B>Rob=20
  Seaman<BR><B>Sent:</B> 07 June 2005 07:46<BR><B>To:</B>=20
  semantics@ivoa.net<BR><B>Cc:</B> Rob Seaman<BR><B>Subject:</B> More =
obscure=20
  analogies<BR></FONT><BR></DIV>
  <DIV></DIV>
  <DIV>
  <DIV>On Jun 6, 2005, at 4:28 PM, Bernard Vatant wrote:</DIV><BR=20
  class=3DApple-interchange-newline>
  <BLOCKQUOTE type=3D"cite">
    <DIV style=3D"MARGIN: 0px">Cool. I love recursive definitions :) =
That one is=20
    certainly operational - fit for everyday life affairs. But to =
provide a=20
    scientific definition of human kind as a species, forget it, it's =
easily=20
    broken ...</DIV></BLOCKQUOTE>
  <DIV><BR class=3Dkhtml-block-placeholder></DIV>Actually, I think it is =
fairly=20
  close to what would be regarded as the current "scientific =
definition". More=20
  to the point, it isn't clear that "everyday" and "scientific" =
definitions are,=20
  or should be, different. Certainly complexity of expression doesn't =
equal=20
  depth of understanding.</DIV>
  <DIV><BR>
  <BLOCKQUOTE type=3D"cite">
    <DIV style=3D"MARGIN: 0px">I would be happy to trace my ancestors =
back to,=20
    say, 200 millions years ago, and meet them one by one - just to =
check the=20
    humanity breaking point</DIV></BLOCKQUOTE>
  <DIV><BR class=3Dkhtml-block-placeholder></DIV>But evolution contains =
the=20
  context for addressing these issues, too. Our most recent common =
ancestor with=20
  chimpanzees was something like seven million years ago. See Richard =
Dawkins'=20
  fabulous "Ancestor's Tale".</DIV>
  <DIV><BR class=3Dkhtml-block-placeholder></DIV>
  <DIV>
  <BLOCKQUOTE type=3D"cite">
    <DIV style=3D"MARGIN: 0px">... Not to mention my descendents 200 =
millions=20
    years from now</DIV></BLOCKQUOTE>
  <DIV><BR class=3Dkhtml-block-placeholder></DIV>It may indeed be =
impossible to=20
  describe entities that do not yet exist.</DIV>
  <DIV><BR>
  <BLOCKQUOTE type=3D"cite">
    <DIV style=3D"MARGIN: 0px">"When in Earth history did humanity =
begin?" is a=20
    question exactly similar to : "When in Universe history did galaxies =

    appear"?</DIV></BLOCKQUOTE>
  <DIV><BR class=3Dkhtml-block-placeholder></DIV>Well, no. The =
underlying=20
  "equations of state", if you will, are very different. Galactic =
evolution is=20
  evolution in name only. You've already pointed out the chicken and egg =
problem=20
  for biological entities. Life is a rich binary tree of cousins - many =
branch=20
  points, many "buds". Galaxies were always galaxies. Before that, they =
were=20
  only proto-galaxies. Our non-human ancestors had their own identities =
- they=20
  were never "proto-humans". One would be more correct to compare the =
first=20
  galaxies to the appearance of the first eukaryotic cell, perhaps - but =
even=20
  then the complexity of the web of life is both greater (in variety) =
and less=20
  (in the knowledge compression of evolutionary genetics) than that of =
"mere"=20
  astronomy.</DIV>
  <DIV><BR>
  <BLOCKQUOTE type=3D"cite">
    <DIV style=3D"MARGIN: 0px">a species is still something very =
difficult to=20
    define, and hard to observe. I won't elaborate on the details here, =
but I=20
    had an interesting breakfast with a botanist a while ago, which =
definitely=20
    destroyed in my mind the notion of any "objective" definition of =
what a=20
    species is ...</DIV></BLOCKQUOTE>
  <DIV><BR class=3Dkhtml-block-placeholder></DIV><FONT =
class=3DApple-style-span=20
  face=3DArial size=3D3><SPAN class=3DApple-style-span =
style=3D"FONT-SIZE: 13px">It may=20
  not be surprising that the taxonomy of Linnaeus may need tweeking =
after 250=20
  years. The notion of a species is quite different - perhaps =
nonexistent - for=20
  entities that reproduce asexually. See<FONT class=3DApple-style-span=20
  face=3DHelvetica size=3D3><SPAN class=3DApple-style-span =
style=3D"FONT-SIZE: 12px"> <A=20
  =
href=3D"http://ucjeps.berkeley.edu/map2.html">http://ucjeps.berkeley.edu/=
map2.html</A>.</SPAN></FONT></SPAN></FONT></DIV>
  <DIV><FONT class=3DApple-style-span face=3DArial size=3D3><SPAN=20
  class=3DApple-style-span style=3D"FONT-SIZE: 13px"><BR></SPAN></FONT>
  <BLOCKQUOTE type=3D"cite"></BLOCKQUOTE>
  <BLOCKQUOTE type=3D"cite">
    <DIV style=3D"MARGIN: 0px">"Undecidable" was not adequate a word, I =
agree, if=20
    you read it in its strict logical sense. I mean you can chose any =
arbitrary=20
    limit, like geographs do for the classification of cities, by =
setting=20
    arbitrary population thresholds ...</DIV></BLOCKQUOTE></DIV><FONT=20
  class=3DApple-style-span color=3D#0000dd></FONT>
  <DIV><FONT class=3DApple-style-span color=3D#0000dd><BR=20
  class=3Dkhtml-block-placeholder></FONT></DIV>
  <DIV><FONT class=3DApple-style-span color=3D#000000>But "city" is an =
arbitrary=20
  notion. "Human" and "Galaxy" have intrinsic meaning, no matter how =
difficult=20
  to pin down. My original comments were specifically about the word =
"event". An=20
  event is not only an arbitrary notion - it is a whole constellation of =

  arbitrary notions.</FONT></DIV>
  <DIV><BR class=3Dkhtml-block-placeholder></DIV>
  <DIV><FONT class=3DApple-style-span color=3D#000000>Rob =
Seaman</FONT></DIV>
  <DIV><FONT class=3DApple-style-span=20
color=3D#000000>NOAO</FONT></DIV></BLOCKQUOTE></BODY></HTML>

------=_NextPart_000_0013_01C56B4D.50E78090--

From owner-semantics@eso.org  Tue Jun  7 12:21:49 2005
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From: Elizabeth Auden <eca@mssl.ucl.ac.uk>
To: semantics@ivoa.net
Subject: VOEvent ontology use cases
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> Do we have any use cases for a voevent ontology?

The one I was thinking of at the VOTech DS5 meeting in Leicester this past 
February is to first build a plausible VOEvent ontology and then construct 
a software agent that could be released against a set of test datasets to 
see if the ontology can be used to identify events and chuck them into a 
catalogue. The specific case I would like to implement will look at a 
month's worth of TRACE or SOHO CDS / MDI / EIT and see if the ontology / 
agent combination can identify solar flares.

Before anyone asks, no, at the moment I don't have a clue how to do this. 
:) However, the Gene Ontology group seems to be using their ontology to do a 
similar (ish) kind of thing - gene samples can be analyzed in conjunction 
with the Gene Ontology to see what components, functions, and larger 
gene-groups any given gene in the sample has. If anyone is interested in 
reading more about this, there are many links to research, papers, and 
software from http://www.geneontology.org.

cheers,
Elizabeth

From owner-semantics@eso.org  Tue Jun  7 14:21:36 2005
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From: "Bernard Vatant" <bernard.vatant@mondeca.com>
To: <semantics@ivoa.net>
Subject: Back to focus RE: More obscure analogies
Date: Tue, 7 Jun 2005 14:21:02 +0200
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Tony

> Maybe we should rename this group the 'VO Philosophy' IG? :)

Count me out ... seriously I apologize for having contributing to lead the debate astray.
For my defense : I was not alone :))

> We need to focus on what the voevent ontology will be *used* for
> and then look at the entities and relationships we need to define for that.

Agreed - the rest of this message tries to be re-focused on technical stuff

Out of all recent brainstorming, I guess there is some sort of agreement on the following
needed entities. First independently of the VOEvent data format, which is the support for
information exchange about those entities.

- "Data Packet" : Set of data gathered under some identified, homogeneous conditions,
including instrumentation, experimental protocol, team, format of data, date/location ...
Seems that each VOEvent includes at least one Data Packet (not sure if it's exactly one,
or one or more).

- "Interpretation" : Assertion of a n-ary relationship between
	One or more Data Packet
	One or more associated Event
	One or more associated Object
	One or more Hypothesis
	One or more Author

Cardinalities are open to discussion ...

Interpretation has an unique ID
More properties can be added, like "Quality", and an open list of relationships with other
interpretations such as consistentWith, inconsistentWith, supportedBy, validatedBy,
refutedBy ...

- "Event" : More or less transient phenomenum (limited interval of time), defined in a
space-time framework. Event has an unique ID and at most one asserted type. Event types
are defined and maintained in specific vocabularies by relevant authorities, or as
subclasses of "Event" (two options worth considering).
Example : GRB, SN, Solar Flare, Star Crisis ...

- "Object" : More or less permanent space-like entity
Object has an unique ID and at most one asserted type. Same remarks as for "Event".
Example : Planet, Star, Galaxy ...

Note that since "Event" and "Object" have a proper life and identity, new Interpretation
can be added at any time to the same Event, using the same or other Data Packet.

Different Interpretation can link the same Data Packet to different Events or Objects, and
associate the same Event to different Object, different Hypothesis, etc So this kind of
model will support the following kind of queries :

- Find hypothesis about an event X, matching data collected by instrument Y, using format
Z ...
- Find events of type A associated with an object O ...
- Find all Interpretation of Data Packet D, where associated object is O ...
- Find all Interpretation associated with event X, consistentWith, or inconsistentWith,
Interpretation I.

Note that for the last one, certainly the most interesting use case, the result of the
query may use declared inconsistencies or inferred ones (based on e.g. conflicting
associated object or event type).

And so on.

Now the question is to clarify which type of entity, and how many of them is/are attached
to a single VOEvent (defined here as an XML document). I would tend to think that a
VOEvent corresponds exactly to one Interpretation. That sounds too good to be true.  What
do you think?

Bernard


-----Message d'origine-----
De : owner-semantics@eso.org [mailto:owner-semantics@eso.org]De la part de Tony Linde
Envoye : mardi 7 juin 2005 11:40
A : semantics@ivoa.net
Objet : RE: More obscure analogies


Maybe we should rename this group the 'VO Philosophy' IG? :)

<<My original comments were specifically about the word "event". An event is not only an
arbitrary notion - it is a whole constellation of arbitrary notions.>>

Surely, from the sem.ig point of view, we need to focus on what the voevent ontology will
be *used* for and then look at the entities and relationships we need to define for that.
Let's keep things simple and focussed to start with and then evolve (sexually and
asexually) the ontologies as new applications or needs arise.

Do we have any use cases for a voevent ontology?

Cheers,
Tony.




From: owner-semantics@eso.org [mailto:owner-semantics@eso.org] On Behalf Of Rob Seaman
Sent: 07 June 2005 07:46
To: semantics@ivoa.net
Cc: Rob Seaman
Subject: More obscure analogies


On Jun 6, 2005, at 4:28 PM, Bernard Vatant wrote:


Cool. I love recursive definitions :) That one is certainly operational - fit for everyday
life affairs. But to provide a scientific definition of human kind as a species, forget
it, it's easily broken ...


Actually, I think it is fairly close to what would be regarded as the current "scientific
definition". More to the point, it isn't clear that "everyday" and "scientific"
definitions are, or should be, different. Certainly complexity of expression doesn't equal
depth of understanding.


I would be happy to trace my ancestors back to, say, 200 millions years ago, and meet them
one by one - just to check the humanity breaking point


But evolution contains the context for addressing these issues, too. Our most recent
common ancestor with chimpanzees was something like seven million years ago. See Richard
Dawkins' fabulous "Ancestor's Tale".


... Not to mention my descendents 200 millions years from now


It may indeed be impossible to describe entities that do not yet exist.


"When in Earth history did humanity begin?" is a question exactly similar to : "When in
Universe history did galaxies appear"?


Well, no. The underlying "equations of state", if you will, are very different. Galactic
evolution is evolution in name only. You've already pointed out the chicken and egg
problem for biological entities. Life is a rich binary tree of cousins - many branch
points, many "buds". Galaxies were always galaxies. Before that, they were only
proto-galaxies. Our non-human ancestors had their own identities - they were never
"proto-humans". One would be more correct to compare the first galaxies to the appearance
of the first eukaryotic cell, perhaps - but even then the complexity of the web of life is
both greater (in variety) and less (in the knowledge compression of evolutionary genetics)
than that of "mere" astronomy.


a species is still something very difficult to define, and hard to observe. I won't
elaborate on the details here, but I had an interesting breakfast with a botanist a while
ago, which definitely destroyed in my mind the notion of any "objective" definition of
what a species is ...


It may not be surprising that the taxonomy of Linnaeus may need tweeking after 250 years.
The notion of a species is quite different - perhaps nonexistent - for entities that
reproduce asexually. See http://ucjeps.berkeley.edu/map2.html.


"Undecidable" was not adequate a word, I agree, if you read it in its strict logical
sense. I mean you can chose any arbitrary limit, like geographs do for the classification
of cities, by setting arbitrary population thresholds ...


But "city" is an arbitrary notion. "Human" and "Galaxy" have intrinsic meaning, no matter
how difficult to pin down. My original comments were specifically about the word "event".
An event is not only an arbitrary notion - it is a whole constellation of arbitrary
notions.


Rob Seaman
NOAO


From owner-semantics@eso.org  Fri Oct 21 10:21:32 2005
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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: "Semantics" <semantics@ivoa.net>
Subject: SKOS
Date: Fri, 21 Oct 2005 09:21:01 +0100
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Some info about SKOS, 'a model for expressing knowledge organization systems
in a machine-understandable way, within the framework of the Semantic Web.'

http://www.w3.org/2004/02/skos/
http://www.xml.com/lpt/a/2005/06/22/skos.html

__
Tony Linde
Phone:  +44 (0)116 223 1292    Mobile: +44 (0)7753 603356
Fax:    +44 (0)116 252 3311    Email:  Tony.Linde@leicester.ac.uk
Post:   Department of Physics & Astronomy,
        University of Leicester
        Leicester, UK   LE1 7RH
Web:    http://www.star.le.ac.uk/~ael
            
Project Manager, EuroVO VOTech   http://eurovotech.org 
Programme Manager, AstroGrid     http://www.astrogrid.org 

From owner-semantics@eso.org  Mon Oct 24 10:20:48 2005
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From: "Bernard Vatant" <bernard.vatant@mondeca.com>
To: <semantics@ivoa.net>
Subject: RE: SKOS
Date: Mon, 24 Oct 2005 10:20:04 +0200
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Tony

Being involved in the development of SKOS and always eager to find out use cases, I'm
curious to know which kind of application (if any) people here envision for SKOS in the
IVOA framework. I imagine it would be relevant e.g. to have a SKOS expression of UCDs, but
apart from the sheer interest of the academic exercise, do you think it would fit e.g. in
the "feasability study" defined at
http://wiki.eurovotech.org/bin/view/VOTech/ResourceDiscovery?

Given the mitigated success (to say the least) of my interventions in last June exchanges
about ontologies in IVOA, I'm very reluctant to push any specific suggestions here :)) But
actually SKOS certainly seems to me a better candidate than OWL to push Semantic Web
languages into IVOA framework, and if there is any further interest in it, I would be
happy to help with any effort in this direction.

Please feel free to jump in the SKOS forum. Archives at
http://lists.w3.org/Archives/Public/public-esw-thes/
to bring any relevant feedback about usability, or lack of usability of SKOS, or any
specific requirments.

Thanks for your interest

Bernard

----------------------------------
Bernard Vatant
Mondeca Knowledge Engineering
bernard.vatant@mondeca.com
(+33) 0871 488 459

http://www.mondeca.com
http://universimmedia.blogspot.com
----------------------------------

> -----Message d'origine-----
> De : owner-semantics@eso.org [mailto:owner-semantics@eso.org]De la part
> de Tony Linde
> Envoye : vendredi 21 octobre 2005 10:21
> A : Semantics
> Objet : SKOS
>
>
> Some info about SKOS, 'a model for expressing knowledge organization systems
> in a machine-understandable way, within the framework of the Semantic Web.'
>
> http://www.w3.org/2004/02/skos/
> http://www.xml.com/lpt/a/2005/06/22/skos.html
>
> __
> Tony Linde
> Phone:  +44 (0)116 223 1292    Mobile: +44 (0)7753 603356
> Fax:    +44 (0)116 252 3311    Email:  Tony.Linde@leicester.ac.uk
> Post:   Department of Physics & Astronomy,
>         University of Leicester
>         Leicester, UK   LE1 7RH
> Web:    http://www.star.le.ac.uk/~ael
>
> Project Manager, EuroVO VOTech   http://eurovotech.org
> Programme Manager, AstroGrid     http://www.astrogrid.org
>


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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: "Semantics" <semantics@ivoa.net>
Subject: ISWC 2005
Date: Mon, 14 Nov 2005 11:24:15 -0000
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I attended the ISWC 2005 conference last week, along with Norman Gray, an
old-hand in the IVOA but a new AstroGrid hire to the EuroVO VOTech project
(working on DS5: Intelligent Resource Discovery). It was a very useful and
informative conference - one with a higher ratio of relevant papers than any
other I've attended on any matter.

For anyone interested I've posted all of the notes I took during the
conference on the VOTech wiki at:
  http://wiki.eurovotech.org/bin/view/VOTech/ISWC2005
They're in .doc format (transcribed from OneNote) and necessarily
abbreviated and rushed but I'm hoping to go through them and add wiki notes
on what I thought most relevant to VOTech and the VObs about each talk -
this may take some time :)

If anyone has any questions, feel free to contact me.

Cheers,
Tony. 

__
Tony Linde
Phone:  +44 (0)116 223 1292    Mobile: +44 (0)7753 603356
Fax:    +44 (0)116 252 3311    Email:  Tony.Linde@leicester.ac.uk
Post:   Department of Physics & Astronomy,
        University of Leicester
        Leicester, UK   LE1 7RH
Web:    http://www.star.le.ac.uk/~ael
            
Project Manager, EuroVO VOTech   http://eurovotech.org 
Programme Manager, AstroGrid     http://www.astrogrid.org 

From owner-semantics@eso.org  Mon Nov 14 12:58:31 2005
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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: <semantics@ivoa.net>
Subject: RE: SKOS
Date: Mon, 14 Nov 2005 11:58:00 -0000
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Hi Bernard, 

It might well be useful in VOTech but I'm not sure we've time to evaluate it
at this stage - perhaps later on.

If anyone does intend to evaluate it, the following might be useful:
  http://www.w3.org/TR/2005/WD-swbp-thesaurus-pubguide-20050517/
 (Quick Guide to Publishing a Thesaurus on the Semantic Web)

Perhaps trying to convert the IAU Thesaurus to RDF using SKOS might be
useful.

Are there any tools for creating SKOS documents, like Protégé for OWL?

Cheers,
Tony. 

> -----Original Message-----
> From: owner-semantics@eso.org 
> [mailto:owner-semantics@eso.org] On Behalf Of Bernard Vatant
> Sent: 24 October 2005 09:20
> To: semantics@ivoa.net
> Subject: RE: SKOS
> 
> 
> Tony
> 
> Being involved in the development of SKOS and always eager to 
> find out use cases, I'm curious to know which kind of 
> application (if any) people here envision for SKOS in the 
> IVOA framework. I imagine it would be relevant e.g. to have a 
> SKOS expression of UCDs, but apart from the sheer interest of 
> the academic exercise, do you think it would fit e.g. in the 
> "feasability study" defined at 
> http://wiki.eurovotech.org/bin/view/VOTech/ResourceDiscovery?
> 
> Given the mitigated success (to say the least) of my 
> interventions in last June exchanges about ontologies in 
> IVOA, I'm very reluctant to push any specific suggestions 
> here :)) But actually SKOS certainly seems to me a better 
> candidate than OWL to push Semantic Web languages into IVOA 
> framework, and if there is any further interest in it, I 
> would be happy to help with any effort in this direction.
> 
> Please feel free to jump in the SKOS forum. Archives at 
> http://lists.w3.org/Archives/Public/public-esw-thes/
> to bring any relevant feedback about usability, or lack of 
> usability of SKOS, or any specific requirments.
> 
> Thanks for your interest
> 
> Bernard
> 
> ----------------------------------
> Bernard Vatant
> Mondeca Knowledge Engineering
> bernard.vatant@mondeca.com
> (+33) 0871 488 459
> 
> http://www.mondeca.com
> http://universimmedia.blogspot.com
> ----------------------------------
> 
> > -----Message d'origine-----
> > De : owner-semantics@eso.org [mailto:owner-semantics@eso.org]De la 
> > part de Tony Linde Envoye : vendredi 21 octobre 2005 10:21 A : 
> > Semantics Objet : SKOS
> >
> >
> > Some info about SKOS, 'a model for expressing knowledge 
> organization systems
> > in a machine-understandable way, within the framework of 
> the Semantic Web.'
> >
> > http://www.w3.org/2004/02/skos/
> > http://www.xml.com/lpt/a/2005/06/22/skos.html
> >
> > __
> > Tony Linde
> > Phone:  +44 (0)116 223 1292    Mobile: +44 (0)7753 603356
> > Fax:    +44 (0)116 252 3311    Email:  Tony.Linde@leicester.ac.uk
> > Post:   Department of Physics & Astronomy,
> >         University of Leicester
> >         Leicester, UK   LE1 7RH
> > Web:    http://www.star.le.ac.uk/~ael
> >
> > Project Manager, EuroVO VOTech   http://eurovotech.org
> > Programme Manager, AstroGrid     http://www.astrogrid.org
> >
> 
> 
> 


From owner-semantics@eso.org  Mon Nov 14 16:19:53 2005
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From: "Bernard Vatant" <bernard.vatant@mondeca.com>
To: <semantics@ivoa.net>
Subject: RE: SKOS
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Hi Tony

> It might well be useful in VOTech but I'm not sure we've time to evaluate it
> at this stage - perhaps later on.

OK

> If anyone does intend to evaluate it, the following might be useful:
>   http://www.w3.org/TR/2005/WD-swbp-thesaurus-pubguide-20050517/
>  (Quick Guide to Publishing a Thesaurus on the Semantic Web)

This is basically a short introduction on how to use SKOS for migration of Thesaurus to
the Semantic Web.
Also relevant is the work of the Vocabulary Management Task Force.
http://www.w3.org/2001/sw/BestPractices/VM/

> Perhaps trying to convert the IAU Thesaurus to RDF using SKOS might be
> useful.

Why not, at least as a proof of concept.
Is that the Thesaurus at http://msowww.anu.edu.au/library/thesaurus/?
And in this case, is it downloadable somewhere in any electronic format?

> Are there any tools for creating SKOS documents, like Protégé for OWL?

No dedicated tools so far I'm afraid. The first SKOS vocabularies will be primarily built
from migration of existing vocabularies in unameit formats. In such cases the best way is
to figure out the target expression in SKOS, and run whatever ad hoc script on the
original thesaurus, if it's correctly structured, to get an RDF/XML serialization in SKOS.
This is something I could achieve, bandwidth permitting, if I can get hold of the original
files, that is. :))

Maintaining the vocabulary afterwards will use any thesaurus management tools supporting a
SKOS output, but such stuff is now on the horizon, not on the shelves. For example in
Mondeca ITM we have a thesaurus management module, we are not able to export SKOS at the
moment, but it's in the pipe.

> Cheers,
> Tony.

Cheers

Bernard

----------------------------------
Bernard Vatant
Mondeca Knowledge Engineering
bernard.vatant@mondeca.com
(+33) 0871 488 459

http://www.mondeca.com
http://universimmedia.blogspot.com
----------------------------------



> > -----Original Message-----
> > From: owner-semantics@eso.org
> > [mailto:owner-semantics@eso.org] On Behalf Of Bernard Vatant
> > Sent: 24 October 2005 09:20
> > To: semantics@ivoa.net
> > Subject: RE: SKOS
> >
> >
> > Tony
> >
> > Being involved in the development of SKOS and always eager to
> > find out use cases, I'm curious to know which kind of
> > application (if any) people here envision for SKOS in the
> > IVOA framework. I imagine it would be relevant e.g. to have a
> > SKOS expression of UCDs, but apart from the sheer interest of
> > the academic exercise, do you think it would fit e.g. in the
> > "feasability study" defined at
> > http://wiki.eurovotech.org/bin/view/VOTech/ResourceDiscovery?
> >
> > Given the mitigated success (to say the least) of my
> > interventions in last June exchanges about ontologies in
> > IVOA, I'm very reluctant to push any specific suggestions
> > here :)) But actually SKOS certainly seems to me a better
> > candidate than OWL to push Semantic Web languages into IVOA
> > framework, and if there is any further interest in it, I
> > would be happy to help with any effort in this direction.
> >
> > Please feel free to jump in the SKOS forum. Archives at
> > http://lists.w3.org/Archives/Public/public-esw-thes/
> > to bring any relevant feedback about usability, or lack of
> > usability of SKOS, or any specific requirments.
> >
> > Thanks for your interest
> >
> > Bernard
> >
> > ----------------------------------
> > Bernard Vatant
> > Mondeca Knowledge Engineering
> > bernard.vatant@mondeca.com
> > (+33) 0871 488 459
> >
> > http://www.mondeca.com
> > http://universimmedia.blogspot.com
> > ----------------------------------
> >
> > > -----Message d'origine-----
> > > De : owner-semantics@eso.org [mailto:owner-semantics@eso.org]De la
> > > part de Tony Linde Envoye : vendredi 21 octobre 2005 10:21 A :
> > > Semantics Objet : SKOS
> > >
> > >
> > > Some info about SKOS, 'a model for expressing knowledge
> > organization systems
> > > in a machine-understandable way, within the framework of
> > the Semantic Web.'
> > >
> > > http://www.w3.org/2004/02/skos/
> > > http://www.xml.com/lpt/a/2005/06/22/skos.html
> > >
> > > __
> > > Tony Linde
> > > Phone:  +44 (0)116 223 1292    Mobile: +44 (0)7753 603356
> > > Fax:    +44 (0)116 252 3311    Email:  Tony.Linde@leicester.ac.uk
> > > Post:   Department of Physics & Astronomy,
> > >         University of Leicester
> > >         Leicester, UK   LE1 7RH
> > > Web:    http://www.star.le.ac.uk/~ael
> > >
> > > Project Manager, EuroVO VOTech   http://eurovotech.org
> > > Programme Manager, AstroGrid     http://www.astrogrid.org
> > >
> >
> >
> >
>
>


From owner-voevent@eso.org  Thu Dec  1 18:24:41 2005
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From: Rob Seaman <seaman@noao.edu>
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Doug says:

> The use-case identified in Madrid, which prompted the need for  
> standard
> object type names was searching by object type in SSA.  We want to be
> able to do things like query for spectra where targetclass=QSO.  I was
> expecting to see a simple list of names like "star", "galaxy", "PN",
> "QSO", "AGN", "GRB", etc., which is what I think users would like to
> search for, but what we have instead are more UCD-like names such as
> "process.variation.burst;em.gamma" which I guess indicates a GRB.

The notion of project specific glossaries has come up before on the  
UCD forums, e.g., http://www.ivoa.net/forum/ucd/0506/0217.htm.  There  
is a need for standardization in both simple names and in highly  
precise nomenclature.  The hierarchical nature of UCDs is intended to  
address this.  Does it?

> I can see where it could be useful to specify more precisely what type
> of object we have as the UCD approach suggested permits, but it would
> also be useful to standardize the actual, simple acronyms commonly  
> used
> by astronomers.  Perhaps what we need are two lists, one for precise
> characterisation of physical object types, another defining the  
> common,
> standard acronym associated with such object types.  This could be  
> done
> by merely defining a standard list of acronyms for object types, and
> assigning one to each of the object type UCDs, where appropriate.

Two lists are only the start.  The key to the success of UCDs now,  
and of ontologies later, will be the ease with which distinct,  
purpose specific, namespaces are supported.  As Doug points out, some  
of those namespaces will contain acronyms/aliases/synonyms of others  
(a feature, not a bug), but this is not the only reason to  
instantiate multiple namespaces.  A list of acronyms (nicknames might  
be another way to put it) represents a namespace that maps as a  
subset of another.  One might also seek to partition a "master" list  
of UCDs (if such were possible) into non-overlapping disjoint sets.   
But the most interesting cases will be namespaces that overlap only  
partially for various historical or topic related reasons.

Andrea's work on incorporating Rick's VOConcept list(s) into the  
standard IVOA UCD namespace is very welcome.  But no matter how  
completely and precisely defined the list is now, it is inevitable  
that new nomenclature will evolve as the science evolves.  The  
proposed mechanism for nominating and adopting new UCDs provides a  
medium to long latency solution for widely purposed names - that are  
also restricted in other ways, such as being deemed unique when  
adopted.  But not all useful names are destined for wide adoption and  
not all projects can wait a minimum of several weeks before using them.

Or invert the question.  The VO will inevitably come into contact  
with prior astronomical art in different areas.  For instance, the  
IAU, through bodies such as CBAT, has previously implemented  
glossaries for characterizing astronomical objects and processes.  A  
successful strategy for the "virtualization" of such projects would  
be to adopt pre-existing nomenclature into project specific  
namespaces.  (This may be the only successful strategy - the VO is  
not going to supplant the IAU.)  It is precisely such baseline  
namespaces that will support the later evolution of a consensus  
understanding of the richly overlapping concepts.  After all, isn't  
this precisely the way that UCDs were harvested from the literature?

A related but orthogonal issue is versioning of namespaces (see,  
e.g., http://www.ivoa.net/forum/ucd/0510/0246.htm).  Imagine a  
document (a VOEvent packet, for instance) that has been issued  
against a particular namespace at a particular time.  The semantics  
of that document depend on the choice of UCDs (or other identifiers)  
that was made from the list as it existed previously.  If the list of  
names is allowed to evolve without versioning, subsequent  
interpretation of the document will change.  A document must be  
interpreted against the context of its creation to be understood  
properly.  A historical document discussing a "supernova" may be  
talking about the same thing as current literature discussing "SN  
Ia".  More to the point, a "spiral nebula" may later be completely  
reinterpreted as a "spiral galaxy".

So, yes - SSA requires a broad list of simple names for categories of  
objects, and VOEvent requires a detailed list of precise categories  
of processes as well as of objects, but both of these are distinct  
from the original purpose of UCDs to tag tabular columns - and all  
future examples of these different types of lists need to be versioned.

Static semantics are boring semantics.

Rob
seaman@noao.edu

From owner-semantics@eso.org  Thu Dec  1 18:24:47 2005
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From: Rob Seaman <seaman@noao.edu>
Subject: Re: VOConcepts paper
Date: Thu, 1 Dec 2005 10:04:34 -0700
To: IVOA List VOEvent <voevent@ivoa.net>
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Doug says:

> The use-case identified in Madrid, which prompted the need for  
> standard
> object type names was searching by object type in SSA.  We want to be
> able to do things like query for spectra where targetclass=QSO.  I was
> expecting to see a simple list of names like "star", "galaxy", "PN",
> "QSO", "AGN", "GRB", etc., which is what I think users would like to
> search for, but what we have instead are more UCD-like names such as
> "process.variation.burst;em.gamma" which I guess indicates a GRB.

The notion of project specific glossaries has come up before on the  
UCD forums, e.g., http://www.ivoa.net/forum/ucd/0506/0217.htm.  There  
is a need for standardization in both simple names and in highly  
precise nomenclature.  The hierarchical nature of UCDs is intended to  
address this.  Does it?

> I can see where it could be useful to specify more precisely what type
> of object we have as the UCD approach suggested permits, but it would
> also be useful to standardize the actual, simple acronyms commonly  
> used
> by astronomers.  Perhaps what we need are two lists, one for precise
> characterisation of physical object types, another defining the  
> common,
> standard acronym associated with such object types.  This could be  
> done
> by merely defining a standard list of acronyms for object types, and
> assigning one to each of the object type UCDs, where appropriate.

Two lists are only the start.  The key to the success of UCDs now,  
and of ontologies later, will be the ease with which distinct,  
purpose specific, namespaces are supported.  As Doug points out, some  
of those namespaces will contain acronyms/aliases/synonyms of others  
(a feature, not a bug), but this is not the only reason to  
instantiate multiple namespaces.  A list of acronyms (nicknames might  
be another way to put it) represents a namespace that maps as a  
subset of another.  One might also seek to partition a "master" list  
of UCDs (if such were possible) into non-overlapping disjoint sets.   
But the most interesting cases will be namespaces that overlap only  
partially for various historical or topic related reasons.

Andrea's work on incorporating Rick's VOConcept list(s) into the  
standard IVOA UCD namespace is very welcome.  But no matter how  
completely and precisely defined the list is now, it is inevitable  
that new nomenclature will evolve as the science evolves.  The  
proposed mechanism for nominating and adopting new UCDs provides a  
medium to long latency solution for widely purposed names - that are  
also restricted in other ways, such as being deemed unique when  
adopted.  But not all useful names are destined for wide adoption and  
not all projects can wait a minimum of several weeks before using them.

Or invert the question.  The VO will inevitably come into contact  
with prior astronomical art in different areas.  For instance, the  
IAU, through bodies such as CBAT, has previously implemented  
glossaries for characterizing astronomical objects and processes.  A  
successful strategy for the "virtualization" of such projects would  
be to adopt pre-existing nomenclature into project specific  
namespaces.  (This may be the only successful strategy - the VO is  
not going to supplant the IAU.)  It is precisely such baseline  
namespaces that will support the later evolution of a consensus  
understanding of the richly overlapping concepts.  After all, isn't  
this precisely the way that UCDs were harvested from the literature?

A related but orthogonal issue is versioning of namespaces (see,  
e.g., http://www.ivoa.net/forum/ucd/0510/0246.htm).  Imagine a  
document (a VOEvent packet, for instance) that has been issued  
against a particular namespace at a particular time.  The semantics  
of that document depend on the choice of UCDs (or other identifiers)  
that was made from the list as it existed previously.  If the list of  
names is allowed to evolve without versioning, subsequent  
interpretation of the document will change.  A document must be  
interpreted against the context of its creation to be understood  
properly.  A historical document discussing a "supernova" may be  
talking about the same thing as current literature discussing "SN  
Ia".  More to the point, a "spiral nebula" may later be completely  
reinterpreted as a "spiral galaxy".

So, yes - SSA requires a broad list of simple names for categories of  
objects, and VOEvent requires a detailed list of precise categories  
of processes as well as of objects, but both of these are distinct  
from the original purpose of UCDs to tag tabular columns - and all  
future examples of these different types of lists need to be versioned.

Static semantics are boring semantics.

Rob
seaman@noao.edu

From owner-ucd@eso.org  Thu Dec  1 18:24:51 2005
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From: Rob Seaman <seaman@noao.edu>
Subject: Re: VOConcepts paper
Date: Thu, 1 Dec 2005 10:04:34 -0700
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Doug says:

> The use-case identified in Madrid, which prompted the need for  
> standard
> object type names was searching by object type in SSA.  We want to be
> able to do things like query for spectra where targetclass=QSO.  I was
> expecting to see a simple list of names like "star", "galaxy", "PN",
> "QSO", "AGN", "GRB", etc., which is what I think users would like to
> search for, but what we have instead are more UCD-like names such as
> "process.variation.burst;em.gamma" which I guess indicates a GRB.

The notion of project specific glossaries has come up before on the  
UCD forums, e.g., http://www.ivoa.net/forum/ucd/0506/0217.htm.  There  
is a need for standardization in both simple names and in highly  
precise nomenclature.  The hierarchical nature of UCDs is intended to  
address this.  Does it?

> I can see where it could be useful to specify more precisely what type
> of object we have as the UCD approach suggested permits, but it would
> also be useful to standardize the actual, simple acronyms commonly  
> used
> by astronomers.  Perhaps what we need are two lists, one for precise
> characterisation of physical object types, another defining the  
> common,
> standard acronym associated with such object types.  This could be  
> done
> by merely defining a standard list of acronyms for object types, and
> assigning one to each of the object type UCDs, where appropriate.

Two lists are only the start.  The key to the success of UCDs now,  
and of ontologies later, will be the ease with which distinct,  
purpose specific, namespaces are supported.  As Doug points out, some  
of those namespaces will contain acronyms/aliases/synonyms of others  
(a feature, not a bug), but this is not the only reason to  
instantiate multiple namespaces.  A list of acronyms (nicknames might  
be another way to put it) represents a namespace that maps as a  
subset of another.  One might also seek to partition a "master" list  
of UCDs (if such were possible) into non-overlapping disjoint sets.   
But the most interesting cases will be namespaces that overlap only  
partially for various historical or topic related reasons.

Andrea's work on incorporating Rick's VOConcept list(s) into the  
standard IVOA UCD namespace is very welcome.  But no matter how  
completely and precisely defined the list is now, it is inevitable  
that new nomenclature will evolve as the science evolves.  The  
proposed mechanism for nominating and adopting new UCDs provides a  
medium to long latency solution for widely purposed names - that are  
also restricted in other ways, such as being deemed unique when  
adopted.  But not all useful names are destined for wide adoption and  
not all projects can wait a minimum of several weeks before using them.

Or invert the question.  The VO will inevitably come into contact  
with prior astronomical art in different areas.  For instance, the  
IAU, through bodies such as CBAT, has previously implemented  
glossaries for characterizing astronomical objects and processes.  A  
successful strategy for the "virtualization" of such projects would  
be to adopt pre-existing nomenclature into project specific  
namespaces.  (This may be the only successful strategy - the VO is  
not going to supplant the IAU.)  It is precisely such baseline  
namespaces that will support the later evolution of a consensus  
understanding of the richly overlapping concepts.  After all, isn't  
this precisely the way that UCDs were harvested from the literature?

A related but orthogonal issue is versioning of namespaces (see,  
e.g., http://www.ivoa.net/forum/ucd/0510/0246.htm).  Imagine a  
document (a VOEvent packet, for instance) that has been issued  
against a particular namespace at a particular time.  The semantics  
of that document depend on the choice of UCDs (or other identifiers)  
that was made from the list as it existed previously.  If the list of  
names is allowed to evolve without versioning, subsequent  
interpretation of the document will change.  A document must be  
interpreted against the context of its creation to be understood  
properly.  A historical document discussing a "supernova" may be  
talking about the same thing as current literature discussing "SN  
Ia".  More to the point, a "spiral nebula" may later be completely  
reinterpreted as a "spiral galaxy".

So, yes - SSA requires a broad list of simple names for categories of  
objects, and VOEvent requires a detailed list of precise categories  
of processes as well as of objects, but both of these are distinct  
from the original purpose of UCDs to tag tabular columns - and all  
future examples of these different types of lists need to be versioned.

Static semantics are boring semantics.

Rob
seaman@noao.edu

From owner-semantics@eso.org  Sat Dec  3 21:32:03 2005
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From: Norman Gray <norman@astro.gla.ac.uk>
Subject: Multi-conference report: VO and SW
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Folks,

I was at a fair range of conferences this year.  With the exception  
of the Kyoto interop, none were about the VO explicitly, but in all  
of them I found ideas or papers which seemed to bear directly on the  
VO's semantic challenges.

I've put together an account of these four meetings, partly for my  
own benefit, to attempt to pull these various strands into a coherent  
whole, but also in the hope that the pointers will be useful to  
others.  The notes started off as a rather compact summary but... grew.

The notes are at <http://nxg.me.uk/note/2005/vo-and-sw/>.  All  
comments and suggestions are most welcome -- enjoy.

All the best,

Norman


-- 
------------------------------------------------------------------------ 
----
Norman Gray  /  http://nxg.me.uk
eurovotech.org  /  University of Leicester, UK



From owner-semantics@eso.org  Sun Dec  4 22:47:18 2005
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Norman,

    Have you taken a look at the ontology that my group has put together?
http://archive.astro.umd.edu/ont/Science.owl
with an OWLDoc output at
http://archive.astro.umd.edu/ont/Documentation/index.html

I am amused by your description of the Gene ontology.  I guess I should 
take your advice and begin to "push
and push until the rest of the community sees the benefit and joins in".

I will start on Monday.

Ed


Norman Gray wrote:

>
> Folks,
>
> I was at a fair range of conferences this year.  With the exception  
> of the Kyoto interop, none were about the VO explicitly, but in all  
> of them I found ideas or papers which seemed to bear directly on the  
> VO's semantic challenges.
>
> I've put together an account of these four meetings, partly for my  
> own benefit, to attempt to pull these various strands into a coherent  
> whole, but also in the hope that the pointers will be useful to  
> others.  The notes started off as a rather compact summary but... grew.
>
> The notes are at <http://nxg.me.uk/note/2005/vo-and-sw/>.  All  
> comments and suggestions are most welcome -- enjoy.
>
> All the best,
>
> Norman
>
>

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Date: Sun, 4 Dec 2005 14:58:15 -0800 (PST)
Subject: Re: Multi-conference report: VO and SW
From: roy@cacr.caltech.edu
To: norman@astro.gla.ac.uk
Cc: semantics@ivoa.net
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Norman

I think this thing that you call out as bad practice was my idea:

"We don't seem to be doing anything that stands out as Bad Practice, with
the possible exception of the proposed ivo: URI scheme."

I would appreciate an elaboration of why it ivo: is bad. It would seem to
me that the prefix http: means Hypertext transfer protocol (that's what I
grew up with anyway), and that our identifiers are definitively NOT that.
I really dislike this practice of making non-URLs look like URLs, it is
confusing.

Therefore I pushed to have a scheme so that it is quite clear that this is
not a URL. In fact, the thing you can do is resolve it with an IVOA
registry and ivo: makes that clear.

Another example is the XML namespace. This is a silly name for it:
http://www.w3.org/2001/XMLSchema-instance. I would suggest that
xmlns://www.w3.org/2001/XMLSchema-instance would be better.

It reminds me of how Native Americans are sometimes called Indians, which
is immediately followed by an explanation that they are not from India.

Thank you
Roy


From owner-semantics@eso.org  Mon Dec  5 10:18:00 2005
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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: <semantics@ivoa.net>
Subject: RE: Multi-conference report: VO and SW
Date: Mon, 5 Dec 2005 09:16:58 -0000
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> I would appreciate an elaboration of why it ivo: is bad. It 

I think it isn't Norman saying this but the W3C. See his section
http://nxg.me.uk/note/2005/vo-and-sw/#dcc. They're simply saying that a
proliferation of naming schemes is bad practice, presumably because only
those in the know can interpret those naming schemes - they aren't globally
interpretable.

Personally, it doesn't worry me because a) our URI scheme generally follows
the guidelines for naming; b) as is pointed out, plenty of others are doing
the same; c) we also provide DC standard details so the metadata is globally
available even if the data isn't; d) no one but an astronomer could possibly
interpret our resources anyway and they'll all be 'in the know'.

Cheers,
Tony. 

> -----Original Message-----
> From: owner-semantics@eso.org 
> [mailto:owner-semantics@eso.org] On Behalf Of roy@cacr.caltech.edu
> Sent: 04 December 2005 22:58
> To: norman@astro.gla.ac.uk
> Cc: semantics@ivoa.net
> Subject: Re: Multi-conference report: VO and SW
> 
> Norman
> 
> I think this thing that you call out as bad practice was my idea:
> 
> "We don't seem to be doing anything that stands out as Bad 
> Practice, with the possible exception of the proposed ivo: 
> URI scheme."
> 
> I would appreciate an elaboration of why it ivo: is bad. It 
> would seem to me that the prefix http: means Hypertext 
> transfer protocol (that's what I grew up with anyway), and 
> that our identifiers are definitively NOT that.
> I really dislike this practice of making non-URLs look like 
> URLs, it is confusing.
> 
> Therefore I pushed to have a scheme so that it is quite clear 
> that this is not a URL. In fact, the thing you can do is 
> resolve it with an IVOA registry and ivo: makes that clear.
> 
> Another example is the XML namespace. This is a silly name for it:
> http://www.w3.org/2001/XMLSchema-instance. I would suggest 
> that xmlns://www.w3.org/2001/XMLSchema-instance would be better.
> 
> It reminds me of how Native Americans are sometimes called 
> Indians, which is immediately followed by an explanation that 
> they are not from India.
> 
> Thank you
> Roy
> 
> 
> 

From owner-semantics@eso.org  Mon Dec  5 12:41:52 2005
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From: "Bernard Vatant" <bernard.vatant@mondeca.com>
To: <semantics@ivoa.net>
Subject: RE: Multi-conference report: VO and SW
Date: Mon, 5 Dec 2005 12:40:45 +0100
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To follow Tony's arguments, see also current debates about other "controversial" or
"non-conventional" URI schemes.

CURIEs (Compact URIs)
http://lists.w3.org/Archives/Public/public-swbp-wg/2005Nov/0184.html

INFO URI
http://www.niso.org/news/releases/pr-InfoURI-11-05.html

> d) no one but an astronomer could possibly interpret our resources anyway and they'll
all be 'in the know'.

Yes, I think this is a killer argument. IPTC pushes the use of CURIEs, for similar reasons
(news agencies will be the only users).

Bottom line : SW folks assume an "unique open information world", but the reality is that
URIs will be used in semi-open (or semi-closed) worlds, or communities of users, inside
which "universal" identifiers such as http URLs will not be relevant.

Cheers

Bernard

----------------------------------
Bernard Vatant
Mondeca Knowledge Engineering
bernard.vatant@mondeca.com
(+33) 0871 488 459

http://www.mondeca.com
http://universimmedia.blogspot.com
----------------------------------

> -----Message d'origine-----
> De : owner-semantics@eso.org [mailto:owner-semantics@eso.org]De la part
> de Tony Linde
> Envoye : lundi 5 decembre 2005 10:17
> A : semantics@ivoa.net
> Objet : RE: Multi-conference report: VO and SW
>
>
> > I would appreciate an elaboration of why it ivo: is bad. It
>
> I think it isn't Norman saying this but the W3C. See his section
> http://nxg.me.uk/note/2005/vo-and-sw/#dcc. They're simply saying that a
> proliferation of naming schemes is bad practice, presumably because only
> those in the know can interpret those naming schemes - they aren't globally
> interpretable.
>
> Personally, it doesn't worry me because a) our URI scheme generally follows
> the guidelines for naming; b) as is pointed out, plenty of others are doing
> the same; c) we also provide DC standard details so the metadata is globally
> available even if the data isn't; d) no one but an astronomer could possibly
> interpret our resources anyway and they'll all be 'in the know'.
>
> Cheers,
> Tony.
>
> > -----Original Message-----
> > From: owner-semantics@eso.org
> > [mailto:owner-semantics@eso.org] On Behalf Of roy@cacr.caltech.edu
> > Sent: 04 December 2005 22:58
> > To: norman@astro.gla.ac.uk
> > Cc: semantics@ivoa.net
> > Subject: Re: Multi-conference report: VO and SW
> >
> > Norman
> >
> > I think this thing that you call out as bad practice was my idea:
> >
> > "We don't seem to be doing anything that stands out as Bad
> > Practice, with the possible exception of the proposed ivo:
> > URI scheme."
> >
> > I would appreciate an elaboration of why it ivo: is bad. It
> > would seem to me that the prefix http: means Hypertext
> > transfer protocol (that's what I grew up with anyway), and
> > that our identifiers are definitively NOT that.
> > I really dislike this practice of making non-URLs look like
> > URLs, it is confusing.
> >
> > Therefore I pushed to have a scheme so that it is quite clear
> > that this is not a URL. In fact, the thing you can do is
> > resolve it with an IVOA registry and ivo: makes that clear.
> >
> > Another example is the XML namespace. This is a silly name for it:
> > http://www.w3.org/2001/XMLSchema-instance. I would suggest
> > that xmlns://www.w3.org/2001/XMLSchema-instance would be better.
> >
> > It reminds me of how Native Americans are sometimes called
> > Indians, which is immediately followed by an explanation that
> > they are not from India.
> >
> > Thank you
> > Roy
> >
> >
> >


From owner-semantics@eso.org  Thu Dec  8 14:16:47 2005
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From: Norman Gray <norman@astro.gla.ac.uk>
Subject: Re: Multi-conference report: VO and SW
Date: Thu, 8 Dec 2005 13:15:41 +0000
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Roy,

How's it going?

On 2005 Dec 4 , at 22.58, roy@cacr.caltech.edu wrote:

> I would appreciate an elaboration of why it ivo: is bad.

As Tony says, I'm to some extent the messenger here.  Myself, I'm  
probably more persuaded than not that URIs are best when they are  
retrievable, but I'm diffident about saying so too loudly, because I  
do agree that things like ivo: seem to provide the strongest  
counterexamples.  However, I'll make the case as strongly as I can  
here.  And honestly, I _have_ tried to keep this short!



The Web Architecture document seems broadly agreed to be a practical  
rather than theological document, and a description of what in  
retrospect made the web `work'.  It's from that hindsight point of  
view that HTTP was identified as having the following almost  
magically good properties:

   1. everyone with a web server can mint identifiers (ie, it's non- 
exclusive and hugely extensible)

   2. HTTP URLs have all the properties you want in an identifier,  
plus retrievability

   3. HTTP GET has very clean and intelligible semantics, which are  
simple to implement and integrate in other applications (ie, you  
don't need a resolver)

Now, the VO isn't interested in property (1) (for better or for  
worse), so we can skip that.

(2) is essentially the argument that if you want something other than  
a URL for your URI, then you're going to have to make a positive case  
why direct retrievability is a practical disadvantage.

The big difference between URIs and URLs is, as we all know, that the  
former are for labelling concepts, and aren't guaranteed to be  
dereferencable, much less immediately retrievable.  However a long- 
established bit of good practice here is to make your URIs  
retrievable and to provide _something_ useful at the end of it, be it  
a human-readable description of your namespace, or of your ontology,  
or whatever you personally mean by the concept thus labelled.

This argument is therefore flatly contra your:

> Another example is the XML namespace. This is a silly name for it:
> http://www.w3.org/2001/XMLSchema-instance. I would suggest that
> xmlns://www.w3.org/2001/XMLSchema-instance would be better.

The two are precisely equivalent as far as the machines are  
concerned, but the latter has given up the free opportunities for  
documentation or clarification that the former offers, for no real  
benefit.    To get those advantages back, you'd have to expensively  
define the xmlns: scheme, and specify and maintain resolvers for it.

As well as the gratis practicality, the recommendation that URIs  
should be URLs undermines any claim that there is still a useful high- 
level distinction between URIs and URLs, beyond the incidental one  
that some are retrievable and some are not (this goes as far back as  
2001 <http://www.w3.org/TR/uri-clarification/> with other remarks in  
<http://www.ietf.org/rfc/rfc3305.txt>).

So the response to your objection

> I really dislike this practice of making non-URLs look like URLs,  
> it is
> confusing.

is: `so make them into URLs'.  You're going to have to document your  
`non-URL' somewhere, so it might as well be there.  `But the URI/URL  
specifies a resource, not a namespace', you say: so let the URL  
retrieve the resource.  Why make things hard by adding a resolver?

The answer is, of course, because we want the IVOA Registry  
infrastructure to get in on the act, and the "ivo:" string means  
`don't ask me, find a resolver and ask it'.  (I'm not in the least  
disputing that the Registry has to be involved; the issue is how to  
do it as cheaply as possible).

That means that the question really is whether the costs of mandating  
a resolver are small enough to justify the benefits obtained.  Those  
costs, remember, include writing an RFC for "ivo:" and getting it  
approved by the IETF, designing an API and/or protocol for the  
resolver(s), and writing the resolver servers themselves.  The  
benefits of the indirection are that

   1. abstraction helps persistence by decoupling the identifier from  
its retrieval
   2. the indirection means you `de-brand' the resolution -- you  
can't easily detect who's serving you the actual resource.

Point (1) is less persuasive than it sounds: domain names like cds.u- 
strasbg.fr will change or fail on roughly the same timescale that  
resolution servers will change or fail, so that you haven't  
fundamentally improved your reliability by the order of magnitude or  
so that would justify the extra costs.  (2) is only an advantage if  
you have no easy fallback.

This is where the ARK scheme that I mentioned seems to hit all the  
sweet spots, and seems to cheaply provide the identifier properties  
we want.

ARK IDs are HTTP URLs and are, it seems, intended to be passed around  
as such.  However the "ark:.*" string within that URL is the  
persistent bit, and can either be chopped out of the URL (if you want  
the de-branding for some reason), or chopped out and reattached to  
the resolver of your choice.

In some sense, therefore, ARKs are just like the ivo: identifiers,  
except that the resolution mechanism is explicitly specified as  
`append this to the HTTP URL for a resolver service'.  There are a  
few other bells and whistles to do with the '?' and '??' stuff I  
mentioned, but that's basically it; extremely simple.  The cost of  
this is that ARK comparison becomes a bit more expensive (you have to  
strip the resolver prefix, or handle the suffix separately).

The benefits are that there's no RFC to write, no API to write, and  
all the costs are removed from the client end (so you can dereference  
an ARK using wget!) because you don't need any further tools (see  
<http://www.doi.org/tools.html>).  Plus you regain all the library,  
application and intelligibility benefits of using HTTP, and you get  
BIND and Apache to do the heavy lifting (getting someone else to do  
the work is always a good thing).

DOIs and Handles appear to be like ivo:, but are arguably like ARKs  
in many cases.  Pace bells and whistles, gongs, tubas and son et  
lumiere in the DOI API, you can basically resolve DOIs by appending  
them to the URL http://dx.doi.org (roll out the 80/20 arguments).

I quoted an RFC above.  The RFC persistent ID is a string of the form  
'^RFC[0-9]*$', but to resolve one, you can transform it into the HTTP  
URL http://www.ietf.org/rfc/<lowercased-RFC-number>.txt.  Conversely,  
given that URL, you can extract the document ID and use your own RFC  
resolver, or I can save you the trouble by quoting it convolved with  
its resolver.

In this last case, as with the ARKs, there is nothing _lost_ by  
quoting it as an HTTP URL, but there's a lot that's gained in terms  
of simplicity and usability.  It means that

     % curl http://www.ivoa.net/ivo-resolver/ivo:/blah | xsltproc  
grokVOTable.xsl | ...

...is a VO-enabled application.



OK, _I_ at least am more convinced than I was at the top of the  
page.  How about you, Roy?

All the best,

Norman


-- 
------------------------------------------------------------------------ 
----
Norman Gray  /  http://nxg.me.uk
eurovotech.org  /  University of Leicester, UK



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From: Norman Gray <norman@astro.gla.ac.uk>
Subject: Re: Multi-conference report: VO and SW
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Sorry, I meant to respond to Tony's and Bernard's points also.

So one cup of tea and a slice of (rather nice) chocolate cake later...

Tony:

> c) we also provide DC standard details so the metadata is globally
> available even if the data isn't

This might be said to repair a problem we created ourselves.


On 2005 Dec 5 , at 11.40, Bernard Vatant wrote:

>> Tony wrote:
>> d) no one but an astronomer could possibly interpret our resources  
>> anyway and they'll
> all be 'in the know'.
>
> Yes, I think this is a killer argument. IPTC pushes the use of  
> CURIEs, for similar reasons
> (news agencies will be the only users).

If I understand CURIE's correctly, while IPTC may have been the  
originators, they needn't be the only users.  Hmm.  _We_ could even  
use CURIEs <http://www.w3.org/2001/sw/BestPractices/HTML/CURIE>:

     <html xmlns:ivo="http://www.ivoa.net/ivo-resolver/ivo:">
     ...
     Look at <a href="[ivo:/blah]" >my data</a>
     ...

There: one CURIE-compliant URI which looks like a ivo: scheme, but is  
really an HTTP URL (and you get to pick/override your namespace/ 
resolver).

INFO URIs are interesting, but a bit of a red herring, I think, since  
they're principally intended to name _offline_ resources, and the  
scheme is explicitly not intended to support dereferencing, which are  
the features which jointly justify the new URI scheme.  ivo:  
resources, in contrast, name things which are online, and which you  
do want to dereference.

> Bottom line : SW folks assume an "unique open information world",  
> but the reality is that
> URIs will be used in semi-open (or semi-closed) worlds, or  
> communities of users, inside
> which "universal" identifiers such as http URLs will not be relevant.

There are plenty of URLs on the web that I can't parse, but I never  
look at them, so they never disturb me.  And while it's true that the  
consumers of ivo: URIs would tend to be specialists using specialised  
software, that simply means that we can slightly discount _one_ of  
the new-scheme disadvantages.

My problem with the ivo: scheme is (I now realise) not any claimed  
architectural impurity of a new scheme, but instead the resolver,  
which seems to bring significant costs with marginal benefits.

For the resolver _does_ lock people out.  I don't mean granny, but an  
astronomer who sees an ivo: identifier in a paper.  If this were a  
URL, she could wget it, look at it, `mmm, what's a VOTable?', google- 
google-google, and `aha!, so that's what the VO is!', then go and  
search for a VOTable2FITS converter.  With a small amount of extra  
capability, she could even type it into a web browser and get  
something useful (I'm thinking of GRDDL, but there would be other  
similar possibilities).

The people who grok the VO, or who will willingly play with VO tools,  
do not constitute the whole of the astronomical community.  `Enable  
view-source' is one of the other things that helps create network  
effects, and requiring a resolver gets in the way of that.

Not having a resolver also means that I can write an application in  
whatever (scripting?) language I like, building on massive amounts of  
HTTP support, rather than flaky or partial IVOA resolver APIs or  
protocols.

All the best,

Norman


-- 
------------------------------------------------------------------------ 
----
Norman Gray  /  http://nxg.me.uk
eurovotech.org  /  University of Leicester, UK



From owner-semantics@eso.org  Thu Dec  8 22:43:04 2005
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From: Doug Tody <dtody@nrao.edu>
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In our case we are purposely using URIs to identify objects but not
locate them - if we want to locate a particular instance we use a URL.
A given URI may resolve into multiple URLs pointing to multiple instances.

For example, we use an "ivo:" URI as a location independent dataset
identifier.  A query can find actual instances of the data, in which case
we have resolved the reference to the level where URLs are appropriate.

 	- Doug



On Mon, 5 Dec 2005, Tony Linde wrote:
>> I would appreciate an elaboration of why it ivo: is bad. It
>
> I think it isn't Norman saying this but the W3C. See his section
> http://nxg.me.uk/note/2005/vo-and-sw/#dcc. They're simply saying that a
> proliferation of naming schemes is bad practice, presumably because only
> those in the know can interpret those naming schemes - they aren't globally
> interpretable.
>
> Personally, it doesn't worry me because a) our URI scheme generally follows
> the guidelines for naming; b) as is pointed out, plenty of others are doing
> the same; c) we also provide DC standard details so the metadata is globally
> available even if the data isn't; d) no one but an astronomer could possibly
> interpret our resources anyway and they'll all be 'in the know'.

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From: Norman Gray <norman@astro.gla.ac.uk>
Subject: Re: Multi-conference report: VO and SW
Date: Fri, 9 Dec 2005 11:52:26 +0000
To: Doug Tody <dtody@nrao.edu>
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Doug,

On 2005 Dec 8 , at 21.42, Doug Tody wrote:

> A given URI may resolve into multiple URLs pointing to multiple  
> instances.

That's the difference!  I had completely forgotten about the one-to- 
many resolution.

I'm working this through out loud here, Doug, for my benefit rather  
than yours, as I imagine you've been through this already, and  
because it might be useful (to me if noone else) to have the whole  
argument in one place.

The underlying reason is that the resources in question are biggish.   
This breaks the assumptions of the best practice/architecture  
analysis in two independent ways:

1. The resources are replicated, and large enough that the client's  
location on the network matters.

2. The size means that HTTP is probably not the best transport  
mechanism, but instead GridFTP, or BitTorrent, or something else.

In both cases, the client can't be expected to make a good decision  
about which source to use (because that will depend on details of the  
national and intercontinental network, which will moreover change in  
time), nor which protocol to use (which will also depend on network  
environment and time).  A local resolver can be expected to know  
these things, either by discovery or configuration.

The assumption that's broken is the single, almost hidden, assumption  
that the transport issue is solved -- `use HTTP'.  Even if that were  
sorted out, and everyone decided that GridFTP (say) was the single  
best transport, the analysis also assumes that there is a single  
source -- a single DNS host -- for the resource; the replication in  
(1) means that we're not assuming that.  That can also be got around,  
by having a DNS name be handled by multiple geographically dispersed  
IP addresses (Google is well known to do this), but this is  
technically complicated and therefore fragile, and also centralised.

Even if they acknowledge the first HTTP point, the response to this  
second point on the part of the TAG (the W3C Technical Architecture  
Group, authors of the Web Architecture document) would be to point at  
the replication implicit in (1).  One of the good features of HTTP is  
that it is stateless, which means that it is very friendly to caches  
and proxies, so you _can_ have a simple single source, and just rely  
on caches to speed things up -- don't try to outsmart the network!   
But the sizes undermine that argument, too: few places have the  
resources to cache lots of multi-GB files, and if regional or  
national centres were set up which could handle that, it would  
require configuration cleverness to use them.  Thus the replication  
is essentially a type of preemptive caching.

On the other hand: I suppose there is still one case for using HTTP  
with a (nominally) single source, along with a smart local proxy,  
which spots when you're requesting a resource/source it knows about,  
and satisfies those requests using (transparently) a separate network  
of replicas and protocols.  That way, the client gets all the  
simplicity, predictability and API advantages of using HTTP naively  
(because that would work fine over a local network).  The proxy is  
effectively acting as a resolver, but the client is interacting with  
it using an extremely simple and possibly built-in protocol/API, and  
so doesn't have to care.  Is there milage in that?

...but I think I'm going on at too much length now, so I'll shut up!

All the best,

Norman


-- 
------------------------------------------------------------------------ 
----
Norman Gray  /  http://nxg.me.uk
eurovotech.org  /  University of Leicester, UK



From owner-semantics@eso.org  Mon Dec 12 17:33:53 2005
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Date: Mon, 12 Dec 2005 08:31:48 -0800
To: semantics@ivoa.net
From: Reagan Moore <moore@sdsc.edu>
Subject: Re: Multi-conference report: VO and SW
Cc: Norman Gray <norman@astro.gla.ac.uk>
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Norman:
The scale of the sky survey collection size drives the preferred 
choice of data management technology.  At SDSC, we have been 
replicating large sky surveys onto the Teragrid to support large 
scale analyses.  We use the following mechanisms to do this:

- install data grid servers at the sites that want to replicate their 
data.  A data grid server is software that runs at the application 
level, and corresponds to the VOSpace/VOStore access software. 
VOStore is intended to provide access to the storage, while VOSpace 
is intended to manage the name spaces.
- register the existing images into the data grid (VOSpace).  VOSpace 
manages a logical name space for each image, independently of the 
naming convention used at the original site.  The logical name space 
can be organized as a collection hierarchy, metadata can be 
associated with each image to support browsing and discovery.
- separately replicate images onto remote systems.  In our case, we 
replicate data onto disk that is directly accessible by the Teragrid.
- port NVO services on top of the data grid.  The same access 
mechanisms will work on either the original site or the Teragrid. 
This brings up the issue of naming convention that will be uniform 
across all storage systems.  Images within a data grid can be labeled 
with a standard URI, or a Globally Unique ID (GUID), or a handle 
(Object ID), or descriptive metadata, or a logical name under which 
the data grid organizes images.  We usually manage 4 name spaces for 
data within the SRB data grid (physical name, logical name, GUID, 
desriptive metadata), but can easily add other naming conventions.

The data grid resolves which replica to use based on expected access 
performance.  The transport mechanisms are designed to support 
parallel I/O streams for large files, bulk transport of small files, 
and interactions with firewalls.  Single images could be moved with 
any desired protocol.  One of the purposes of the data grid is to map 
from the protocols used by storage systems to the protocols used by 
user-preferred clients.  You can choose to move data through a web 
interface using HTTP, or through bulk transfer mechanisms using 
parallel I/O streams.

An example is the data grid technology installed by NOAO to manage 
data movement from telescopes in Chile to Tucson, and the 
organization of images in a persistent archive for long term storage.

Reagan Moore
SDSC



>Doug,
>
>On 2005 Dec 8 , at 21.42, Doug Tody wrote:
>
>>A given URI may resolve into multiple URLs pointing to multiple instances.
>
>That's the difference!  I had completely forgotten about the 
>one-to-many resolution.
>
>I'm working this through out loud here, Doug, for my benefit rather 
>than yours, as I imagine you've been through this already, and 
>because it might be useful (to me if noone else) to have the whole 
>argument in one place.
>
>The underlying reason is that the resources in question are biggish.  
>This breaks the assumptions of the best practice/architecture 
>analysis in two independent ways:
>
>1. The resources are replicated, and large enough that the client's 
>location on the network matters.
>
>2. The size means that HTTP is probably not the best transport 
>mechanism, but instead GridFTP, or BitTorrent, or something else.
>
>In both cases, the client can't be expected to make a good decision 
>about which source to use (because that will depend on details of 
>the national and intercontinental network, which will moreover 
>change in time), nor which protocol to use (which will also depend 
>on network environment and time).  A local resolver can be expected 
>to know these things, either by discovery or configuration.
>
>The assumption that's broken is the single, almost hidden, 
>assumption that the transport issue is solved -- `use HTTP'.  Even 
>if that were sorted out, and everyone decided that GridFTP (say) was 
>the single best transport, the analysis also assumes that there is a 
>single source -- a single DNS host -- for the resource; the 
>replication in (1) means that we're not assuming that.  That can 
>also be got around, by having a DNS name be handled by multiple 
>geographically dispersed IP addresses (Google is well known to do 
>this), but this is technically complicated and therefore fragile, 
>and also centralised.
>
>Even if they acknowledge the first HTTP point, the response to this 
>second point on the part of the TAG (the W3C Technical Architecture 
>Group, authors of the Web Architecture document) would be to point 
>at the replication implicit in (1).  One of the good features of 
>HTTP is that it is stateless, which means that it is very friendly 
>to caches and proxies, so you _can_ have a simple single source, and 
>just rely on caches to speed things up -- don't try to outsmart the 
>network!  
>But the sizes undermine that argument, too: few places have the 
>resources to cache lots of multi-GB files, and if regional or 
>national centres were set up which could handle that, it would 
>require configuration cleverness to use them.  Thus the replication 
>is essentially a type of preemptive caching.
>
>On the other hand: I suppose there is still one case for using HTTP 
>with a (nominally) single source, along with a smart local proxy, 
>which spots when you're requesting a resource/source it knows about, 
>and satisfies those requests using (transparently) a separate 
>network of replicas and protocols.  That way, the client gets all 
>the simplicity, predictability and API advantages of using HTTP 
>naively (because that would work fine over a local network).  The 
>proxy is effectively acting as a resolver, but the client is 
>interacting with it using an extremely simple and possibly built-in 
>protocol/API, and so doesn't have to care.  Is there milage in that?
>
>...but I think I'm going on at too much length now, so I'll shut up!
>
>All the best,
>
>Norman
>
>
>--
>----------------------------------------------------------------------------
>Norman Gray  /  http://nxg.me.uk
>eurovotech.org  /  University of Leicester, UK

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OWL Ontology of Astronomy: Part I OWL Basics

This is the start of a long description of an ontology being developed 
at UMD (mostly by myself, but with significant inputs from Brian Thomas, 
Zhenping  Huang, and Peter Teuben), but broken up into small (couple of 
pages at  a time) parts.  It will require many parts (e-mails) to 
describe everything, and I don't know how many parts there will be yet.  
It is being developed with a specific application in mind primarily, but 
some consideration is given for future applications as well.  The 
specific application that we are working on would provide users with a 
GUI with the entire ontology in a menu and let them drag and drop 
Classes onto a drawing board and build the object that they are querying 
for.  There would be forms within the object to enter ranges on property 
range values and other detailed choices.  The application would then use 
the ontology to hunt down optional paths to derive the desired goal 
using Operations or Relationships within the  ontology and present  the  
paths for the user to  include or exclude.   After all of the paths are 
worked out the user submits the query to the Data Hunter which sends 
queries (ADQL or higher level query) to data centers.
That is all I will say about the motivation for this ontology for now, 
the rest is the ontology itself.

The ontology is composed of a number of sub-ontologies and this number 
grows with time.
Science.owl - generally useful stuff that scientists need but don't fit 
into any of the existing namespaces.  As new namespaces are created some 
of these will be moved to a more appropriate subontologies.  This 
ontology holds most of the broadest classes and therefore the highest 
levels of the hierarchy.
Astronomy.owl - Anything pertinent to astronomy and either not used by 
other sciences or used quite differently by astronomers.
Physics.owl - some basic physics of use to astronomers.  Most everything 
in physics is useful to astronomers, but details about exotic particles, 
for instance, has not yet found a use among astronomers.
Geometry.owl - basic geometry and coordinates
units_ontology.owl and units_instances.owl - for physical units
Quantity.owl - here,  quantity refers to amounts and measurements that 
might require accuracy and unit properties
Statistics.owl - useful, but I haven't done much with this yet.
Process.owl - originating from a group at JPL, I am adapting it to our 
needs.  This is way harder to do than it looks, but it is important to 
try incorporating ontologies created elsewhere.  Surprisingly, I could 
find no other usable ontology.
All of these are found at http://archive.astro.umd.edu/ont , but the 
root is the Science.owl which imports all of the others.

 OWL  basics:
OWL, based on RDF, relies on triplet statements.  This is expressed as 
(Domain, property, Range) where
Domain and Range are Classes of instances.  Domain corresponds to the 
subject of a statement and Range would be the object of the property as 
a predicate.  Thus, any two instances are related through the property 
relationship and there is a definite direction to this relationship , as 
in A has B.
There are two basic types of properties in OWL, DataProperties which 
take xs:datatypes in its range (xs:int, xs:string, xs:date, etc) and 
ObjectProperties which take classes in its range.   In defining  the 
ontology one first specifies the set of classes in the Domain and in the 
Range of each property.  Then, statements on instances must satisfy 
these constraints of which instances can be in the domain and which in 
the range of the statement's property.

A special Objectproperty is the owl:SubClassOf  which makes the range a 
subclass of  the domain.  The domain of a property automatically extends 
to the subclasses of the domain classes.

All classes are subclasses of  owl:Thing and there are a few properties 
such as comment and label that have Thing as their domain and thus are 
in all Things.  I think of properties as totally separate from Thing 
although OWL:Full allows properties to be Things.  There is a 
subPropertyOf which implies  a property has a Domain that is a subset of 
the Domain of the super's and a Range that is a subset of the super's.

That is sufficient to begin discussion of  an actual ontology and other 
OWL concepts can be introduces as they are used.  I have adopted a 
camelback nomenclature where  classnames have initial letter capitalized 
and properties have initial letter not capitalized.  I have also manage 
thus far to avoid explicitly stating disjointedness betwee classes.  All 
classes are implicitly disjoint unless they are explicitly subclasses.  
It will be interesting to see how far we can go with this before some 
inconsistency arises.  But doing this has immensely simplified the RDF 
output files.

Part II, will look at some parts of Geometry.owl because I am hoping to 
describe coordinate systems soon.  But that will require first at least 
a brief look at Quantity.owl.  After geometry we can look at the 
astroObjects and their properties.  Then Operations, Relationships and Code.

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Astronomy Ontology: Part II - Geometry

Everything in the Geometry ontology is a subclass of GeometricEntity 
which is a direct subclass of owl:Thing.
This helps makes things tidy  at the level below Thing. 

Lets start with geo:Space and its properties:

Space  hasDimensionality [single nonNegativeInteger] # Just the number 
                                           #of Dimensions in the Space
      hasDimension [multiple q:Quantity]   #Can make a list of the 
                                    #Dimensions (presumably orthogonal)

      hasSlice [multiple Space]     #Infinite slice (ie, drop a few 
                                    #dimensions if you like)

      sliceOf [single Space]        #inverse_of_hasSlice

      hasRegion [single Region]     #Any section of the Space

Note that Space will probably be used to define parameter spaces or 
a physical Space (Dimensions of length, width, height say), a subclass 
of this would be astro:Space which refers only to Space of the Universe 
or a simulation of the Universe.

To describe Region we need to work our way up from Shape and Point. 
I made an arbitrary decision that Shape is the boundaryOf Region.  Thus
if we say a Shape Square, this refer to the boundary of a square Region.
If we say Shape Sphere, this refers to the surface of the solid 
Spherical region. 
Here is the class Hierarchy for Shape:

Shape

  * Any-D_Shape   \*Dimension of shape depends on min dimensions
                      \*needed to describe it.  Of course, it may be 
		       \*mapped to another space where the dimensionality
                      \*is different.
  * Curve         \*Curves can wander around N-dimensional

  * One-D_Shape

        o Line

              + Directrix

        o LineSegment
 
              + Chord
 
                    # Diameter
 
              + Diagonal
 
              + Side
 
                    # Edge
 
        o Ray


  * Point
 
        o Center
 
              + CenterOfMass  \*Well, maybe this and the next
                                  \*belong in physics. 
              + CenterOfRotation 

              + GeometricCenter
 
        o EndPoint
 
        o FocusPoint
 
        o Pole
 
        o Vertex
 
        o VertexOfParabola
Here I interrupt the list of shapes for brevity, and put the rest of 
the list at the end as an appendix.

All Shapes inherit the following properties:

Shape embeddedIn [single Space | multiple Region]
     similarTo [multiple Space]
     congruentTo [multiple Shape]
     definedBy  [multiple Intersection | mutiple sci:Expression 
			| multiple LineSegment]

LineSegment has a restricted definedBy
LineSegment definedBy  [2 EndPoint]

And now we can look at Region Class

  * Region
 
        o Intersection

              + ast:AscendingNode
 
              + ast:DescendingNode
 
        o Union
 
        o Point  \* Point is both Region and Shape (because it
		 \* does not make too much sense to talk about
		 \* its boundary 


Region hasBoundary [single Shape]
       hasSubClass Intersection ofRegion [multiple Region]
                                    ofShape [multiple Shape]

So, a region is built by defining its boundary or by intersecting 
Regions or Shapes or by the Union of them.  
Perhaps other ways will be added.

One more item before I run out of time.
Angle hasAngularSize [single sci:AngularSize]

Thus there can be a thing AngleA which hasAngularSize 7degpm3
Where 7degpm3 is a q:Quantity/sci:Measurement 
7degpm3 value 7
       units deg
       error 3
                                             
Well, we didn't get to coordinates in this.  Maybe in the next Part.
=================================
Appendix: The rest of the Shapes
 Projection 
          ParallelProjection 
            ObliqueProjection 
              CabinetProjection 
              CavalierProjection 
            OrthographicProjection 
              AxonometricProjection 
                Isometric 
              MultiviewProjection 
          PerspectiveProjection 
          PlanarProjection 
          ProjectionOnto3D_Shape 
        Three-D_Shape 
          Cone 
            CircularCone 
          Hyperboloid 
          Parabaloid 
          Polyhedron 
            Octahedron 
            Prism 
            Pyramid 
          Spheroid 
            OblateSpheroid 
            ProlateSpheroid 
            Sphere 
          ProjectionOnto3D_Shape 
        Two-D_Shape 
          CurveOnPlane 
            ClosedCurve 
              Ellipse 
                Circle 
                  GreatCircle 
            ConicSection 
              Ellipse 
                Circle 
                  GreatCircle 
              Hyperbola 
              Parabola 
            Harmonograph 
              LissajousCurve 
          Plane 
          Polygon 
            ConcavePolygon 
            ConvexPolygon 
              Hexagon 
              Octagon 
              Pentagon 
              Quadralateral 
                Parallelogram 
                  Rectangle 
                    Square 
                  Rhombus 
                    Square 
                Trapezoid 
              Triangle 
                EquilateralTriangle 
                IsoscelesTriangle 
                RightTriangle 
            Face 

From owner-semantics@eso.org  Tue Dec 20 21:33:59 2005
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The appendix lost its linefeeds, so I put them back in.

Ed

Astronomy Ontology: Part II - Geometry

Everything in the Geometry ontology is a subclass of GeometricEntity 
which is a direct subclass of owl:Thing.
This helps makes things tidy  at the level below Thing. 

Lets start with geo:Space and its properties:

Space  hasDimensionality [single nonNegativeInteger] # Just the number 
                                         #of Dimensions in the Space
    hasDimension [multiple q:Quantity]   #Can make a list of the 
                                  #Dimensions (presumably orthogonal)

    hasSlice [multiple Space]     #Infinite slice (ie, drop a few 
                                  #dimensions if you like)

    sliceOf [single Space]        #inverse_of_hasSlice

    hasRegion [single Region]     #Any section of the Space

Note that Space will probably be used to define parameter spaces or 
a physical Space (Dimensions of length, width, height say), a subclass 
of this would be astro:Space which refers only to Space of the Universe 
or a simulation of the Universe.

To describe Region we need to work our way up from Shape and Point. 
I made an arbitrary decision that Shape is the boundaryOf Region.  Thus
if we say a Shape Square, this refer to the boundary of a square Region.
If we say Shape Sphere, this refers to the surface of the solid 
Spherical region. 
Here is the class Hierarchy for Shape:

Shape

* Any-D_Shape   \*Dimension of shape depends on min dimensions
                    \*needed to describe it.  Of course, it may be 
		       \*mapped to another space where the dimensionality
                    \*is different.
* Curve         \*Curves can wander around N-dimensional

* One-D_Shape

      o Line

            + Directrix

      o LineSegment

            + Chord

                  # Diameter

            + Diagonal

            + Side

                  # Edge

      o Ray


* Point

      o Center

            + CenterOfMass  \*Well, maybe this and the next
                                \*belong in physics. 
            + CenterOfRotation 

            + GeometricCenter

      o EndPoint

      o FocusPoint

      o Pole

      o Vertex

      o VertexOfParabola
Here I interrupt the list of shapes for brevity, and put the rest of 
the list at the end as an appendix.

All Shapes inherit the following properties:

Shape embeddedIn [single Space | multiple Region]
   similarTo [multiple Space]
   congruentTo [multiple Shape]
   definedBy  [multiple Intersection | mutiple sci:Expression 
			| multiple LineSegment]

LineSegment has a restricted definedBy
LineSegment definedBy  [2 EndPoint]

And now we can look at Region Class

* Region

      o Intersection

            + ast:AscendingNode

            + ast:DescendingNode

      o Union

      o Point  \* Point is both Region and Shape (because it
		 \* does not make too much sense to talk about
		 \* its boundary 


Region hasBoundary [single Shape]
     hasSubClass Intersection ofRegion [multiple Region]
                                  ofShape [multiple Shape]

So, a region is built by defining its boundary or by intersecting 
Regions or Shapes or by the Union of them.  
Perhaps other ways will be added.

One more item before I run out of time.
Angle hasAngularSize [single sci:AngularSize]

Thus there can be a thing AngleA which hasAngularSize 7degpm3
Where 7degpm3 is a q:Quantity/sci:Measurement 
7degpm3 value 7
     units deg
     error 3
                                           
Well, we didn't get to coordinates in this.  Maybe in the next Part.
=================================
Appendix: The rest of the Shapes
Projection

        ParallelProjection

          ObliqueProjection

            CabinetProjection

            CavalierProjection

          OrthographicProjection

            AxonometricProjection

              Isometric

            MultiviewProjection

        PerspectiveProjection

        PlanarProjection

        ProjectionOnto3D_Shape

      Three-D_Shape

        Cone

          CircularCone

        Hyperboloid

        Parabaloid

        Polyhedron

          Octahedron

          Prism

          Pyramid

        Spheroid

          OblateSpheroid

          ProlateSpheroid

          Sphere

        ProjectionOnto3D_Shape

      Two-D_Shape

        CurveOnPlane

          ClosedCurve

            Ellipse

              Circle

                GreatCircle

          ConicSection

            Ellipse

              Circle

                GreatCircle

            Hyperbola

            Parabola

          Harmonograph

            LissajousCurve

        Plane

        Polygon

          ConcavePolygon

          ConvexPolygon

            Hexagon

            Octagon

            Pentagon

            Quadralateral

              Parallelogram

                Rectangle

                  Square

                Rhombus

                  Square

              Trapezoid

            Triangle

              EquilateralTriangle

              IsoscelesTriangle

              RightTriangle

          Face 





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Oracle has incorporated RDF and OWL into the Oracle10g product and has 
extended its SQL to include RDF triples (very similar to RDQL).

http://www.oracle.com/technology/industries/life_sciences/pdf/ls_bio_ontologies_dev_envmt_24jun05.pdf

They provide a plugin to Protege to allow that to be the front end to 
the Oracle RDF tables and a standalone app that takes N3 format OWL to 
Oracle or from Oracle to N3.

For those who wish to see the nitty-gritty.  Here is a white paper from 
them.
http://www.oracle.com/technology/tech/semantic_technologies/pdf/semantic_tech_rdf_wp.pdf

Ed

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To: "'Semantics'" <semantics@ivoa.net>, Brian Thomas <thomas@astro.umd.edu>,
        Zhenping Huang <zhenping.huang.1@gsfc.nasa.gov>,
        Peter Teuben <teuben@astro.umd.edu>
Subject: URIQA
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URIQA extends the present web architecture by introducing the following 
new HTTP <http://www.ietf.org/rfc/rfc2616.txt?number=2616> methods for 
interacting with an authoritative semantic web enabled web server:

http://sw.nokia.com/uriqa/URIQA.html

Ed

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Date: Mon, 15 May 2006 13:50:03 -0400
Subject: FW: standard vocabulary
From: Robert Hanisch <hanisch@stsci.edu>
To: <semantics@ivoa.net>
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------ Forwarded Message
From: Robert Hanisch <hanisch@stsci.edu>
Date: Mon, 15 May 2006 13:47:05 -0400
To: Andrea Preite Martinez <andrea.preitemartinez@rm.iasf.cnr.it>
Conversation: standard vocabulary
Subject: standard vocabulary

Hi Andrea.  You might want to look at the document I posted to the agenda of
the Registry WG describing metadata for press release images.  The authors
of this document have also developed a standard vocabulary.

http://www.ivoa.net/internal/IVOA/InterOpMay2006ResReg/AOIMetadata_final.pdf

Bob

------ End of Forwarded Message


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Cc: "voevent-core@us-vo.org>" <voevent-core@us-vo.org>, semantics@ivoa.net,
        Lars Christensen Lindberg <lars@eso.org>,
        Robert Hanisch <hanisch@stsci.edu>
From: "Frederic V. \"Rick\" Hessman" <hessman@astro.physik.uni-goettingen.de>
Subject: Re: [Voevent-core] Fwd: standard vocabulary
Date: Tue, 16 May 2006 08:28:45 +0200
To: Rob Seaman <seaman@noao.edu>
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I, for one, knew that the AOI was working on a controlled vocabulary,  
but their agenda was always geared towards describing press-images  
rather than defining a general-purpose UCD-like proto-ontology.     
However, their approach is at least systematic, which isn't always  
true for what we've been discussing: both UCD's and the proposed  
standard vocabulary/VOConcepts tend to look like random collection of  
ideas which someday may be organized into an ontology.  Yes, I know:  
it's easy for AOI to be systematic when they limit their scope from  
the beginning (e.g. they don't have words for things which aren't  
easily shown in press-images).

The bottom line is that, yes, it would make sense to bring all of the  
vocabulary people together and to see if we can agree on a common  
basis.  My guess is that there's little chance, so Rob's idea of  
everyone having their own private vocabularies (e.g. VOEvent's "GRB"  
versus the UCD-like "process.burst;em.gamma" versus nothing yet for  
the AOI list) and the IVOA providing the standard vocabulary as the  
means of constructing conversion tables still sounds like the best  
path: everyone gets what they want and the IVOA gets a common  
standard which everyone can live with.   For example, adding standard  
vocabulary to the AOI list as a further column would be trivia and  
any missing elements would be a good sign of where the proposed  
standard vocabulary needs some additions.

Rick

On 15 May 2006, at 8:15 pm, Rob Seaman wrote:

> Anybody have a comment on this alternative for both RM and  
> controlled vocabulary?  IVOA must be maturing if it now has two  
> standards for every problem.  Think VOEvent needs only one.  But  
> which one?
>
> Rob
> ------
>
> Begin forwarded message:
>
>> From: Robert Hanisch <hanisch@stsci.edu>
>> Date: May 15, 2006 10:50:03 AM MST
>> To: <semantics@ivoa.net>
>> Subject: FW: standard vocabulary
>> Reply-To: Robert Hanisch <hanisch@stsci.edu>
>>
>>
>> ------ Forwarded Message
>> From: Robert Hanisch <hanisch@stsci.edu>
>> Date: Mon, 15 May 2006 13:47:05 -0400
>> To: Andrea Preite Martinez <andrea.preitemartinez@rm.iasf.cnr.it>
>> Conversation: standard vocabulary
>> Subject: standard vocabulary
>>
>> Hi Andrea.  You might want to look at the document I posted to the  
>> agenda of
>> the Registry WG describing metadata for press release images.  The  
>> authors
>> of this document have also developed a standard vocabulary.
>>
>> http://www.ivoa.net/internal/IVOA/InterOpMay2006ResReg/ 
>> AOIMetadata_final.pdf
>>
>> Bob
>>
>> ------ End of Forwarded Message
>>
>>
>


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<HTML><BODY style=3D"word-wrap: break-word; -khtml-nbsp-mode: space; =
-khtml-line-break: after-white-space; ">I, for one, knew that the AOI =
was working on a controlled vocabulary, but their agenda was always =
geared towards describing press-images rather than defining a =
general-purpose UCD-like proto-ontology. =A0 =A0However, their approach =
is at least systematic, which isn't always true for what we've been =
discussing: both UCD's and the proposed standard vocabulary/VOConcepts =
tend to look like random collection of ideas which someday may be =
organized into an ontology.=A0 Yes, I know: it's easy for AOI to be =
systematic when they limit their scope from the beginning (e.g. they =
don't have words for things which aren't easily shown in =
press-images).<DIV><BR class=3D"khtml-block-placeholder"></DIV><DIV>The =
bottom line is that, yes, it would make sense to bring all of the =
vocabulary people together and to see if we can agree on a common =
basis.=A0 My guess is that there's little chance, so Rob's idea of =
everyone having their own private vocabularies (e.g. VOEvent's "GRB" =
versus the UCD-like "process.burst;em.gamma" versus nothing yet for the =
AOI list) and the IVOA providing the standard vocabulary as the means of =
constructing conversion tables still sounds like the best path: everyone =
gets what they want and the IVOA gets a common standard which everyone =
can live with.=A0 =A0For example, adding standard vocabulary to the AOI =
list as a further column would be trivia and any missing elements would =
be a good sign of where the proposed standard vocabulary needs some =
additions.</DIV><DIV><BR =
class=3D"khtml-block-placeholder"></DIV><DIV>Rick</DIV><DIV><BR><DIV><DIV>=
On 15 May 2006, at 8:15 pm, Rob Seaman wrote:</DIV><BR =
class=3D"Apple-interchange-newline"><BLOCKQUOTE type=3D"cite">Anybody =
have a comment on this alternative for both RM and controlled =
vocabulary?=A0 IVOA must be maturing if it now has two standards for =
every problem.=A0 Think VOEvent needs only one.=A0 But which =
one?<DIV><BR =
class=3D"khtml-block-placeholder"></DIV><DIV>Rob</DIV><DIV>------<BR><DIV>=
<BR><DIV>Begin forwarded message:</DIV><BR =
class=3D"Apple-interchange-newline"><BLOCKQUOTE type=3D"cite"><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; "><FONT face=3D"Helvetica" size=3D"3" color=3D"#000000" =
style=3D"font: 12.0px Helvetica; color: #000000"><B>From: =
</B></FONT><FONT face=3D"Helvetica" size=3D"3" style=3D"font: 12.0px =
Helvetica">Robert Hanisch &lt;<A =
href=3D"mailto:hanisch@stsci.edu">hanisch@stsci.edu</A>&gt;</FONT></DIV><D=
IV style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; "><FONT face=3D"Helvetica" size=3D"3" color=3D"#000000" =
style=3D"font: 12.0px Helvetica; color: #000000"><B>Date: =
</B></FONT><FONT face=3D"Helvetica" size=3D"3" style=3D"font: 12.0px =
Helvetica">May 15, 2006 10:50:03 AM MST</FONT></DIV><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; "><FONT face=3D"Helvetica" size=3D"3" color=3D"#000000" =
style=3D"font: 12.0px Helvetica; color: #000000"><B>To: </B></FONT><FONT =
face=3D"Helvetica" size=3D"3" style=3D"font: 12.0px Helvetica">&lt;<A =
href=3D"mailto:semantics@ivoa.net">semantics@ivoa.net</A>&gt;</FONT></DIV>=
<DIV style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; "><FONT face=3D"Helvetica" size=3D"3" color=3D"#000000" =
style=3D"font: 12.0px Helvetica; color: #000000"><B>Subject: =
</B></FONT><FONT face=3D"Helvetica" size=3D"3" style=3D"font: 12.0px =
Helvetica"><B>FW: standard vocabulary</B></FONT></DIV><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; "><FONT face=3D"Helvetica" size=3D"3" color=3D"#000000" =
style=3D"font: 12.0px Helvetica; color: #000000"><B>Reply-To: =
</B></FONT><FONT face=3D"Helvetica" size=3D"3" style=3D"font: 12.0px =
Helvetica">Robert Hanisch &lt;<A =
href=3D"mailto:hanisch@stsci.edu">hanisch@stsci.edu</A>&gt;</FONT></DIV><D=
IV style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; min-height: 14px; "><BR></DIV> <DIV style=3D"margin-top:=
 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; =
min-height: 14px; "><BR></DIV><DIV style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">------ =
Forwarded Message</DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; ">From: Robert Hanisch &lt;<A =
href=3D"mailto:hanisch@stsci.edu">hanisch@stsci.edu</A>&gt;</DIV><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; ">Date: Mon, 15 May 2006 13:47:05 -0400</DIV><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; ">To: Andrea Preite Martinez &lt;<A =
href=3D"mailto:andrea.preitemartinez@rm.iasf.cnr.it">andrea.preitemartinez=
@rm.iasf.cnr.it</A>&gt;</DIV><DIV style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Conversation: =
standard vocabulary</DIV><DIV style=3D"margin-top: 0px; margin-right: =
0px; margin-bottom: 0px; margin-left: 0px; ">Subject: standard =
vocabulary</DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; ">Hi Andrea.<SPAN class=3D"Apple-converted-space">=A0 =
</SPAN>You might want to look at the document I posted to the agenda =
of</DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: =
0px; margin-left: 0px; ">the Registry WG describing metadata for press =
release images.<SPAN class=3D"Apple-converted-space">=A0 </SPAN>The =
authors</DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; ">of this document have also =
developed a standard vocabulary.</DIV><DIV style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: =
14px; "><BR></DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; "><A =
href=3D"http://www.ivoa.net/internal/IVOA/InterOpMay2006ResReg/AOIMetadata=
_final.pdf">http://www.ivoa.net/internal/IVOA/InterOpMay2006ResReg/AOIMeta=
data_final.pdf</A></DIV><DIV style=3D"margin-top: 0px; margin-right: =
0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; =
"><BR></DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; ">Bob</DIV><DIV style=3D"margin-top:=
 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; =
min-height: 14px; "><BR></DIV><DIV style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">------ End of =
Forwarded Message</DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; min-height: 14px; "><BR></DIV> =
</BLOCKQUOTE></DIV><BR></DIV></BLOCKQUOTE></DIV><BR></DIV></BODY></HTML>=

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Message-ID: <4469D5AD.6040903@eso.org>
Date: Tue, 16 May 2006 15:37:49 +0200
From: Lars Lindberg Christensen <lars@eso.org>
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To: "Frederic V. \"Rick\" Hessman" <hessman@astro.physik.uni-goettingen.de>
CC: Rob Seaman <seaman@noao.edu>,
        "voevent-core@us-vo.org>" <voevent-core@us-vo.org>, semantics@ivoa.net,
        Robert Hanisch <hanisch@stsci.edu>,
        Robert Hurt <hurt@ipac.caltech.edu>
Subject: Re: [Voevent-core] Fwd: standard vocabulary
References: <C08E378B.FCEE%hanisch@stsci.edu> <34F8DCFB-379F-4D5A-99A0-F855EF3F1B4F@noao.edu> <030E2B07-1907-4F3A-9AC4-224A52B91636@astro.physik.uni-goettingen.de>
In-Reply-To: <030E2B07-1907-4F3A-9AC4-224A52B91636@astro.physik.uni-goettingen.de>
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Hi
If I understand correctly most of your discussion is on our "14. 
Subject.Category: Astronomical Object Taxonomy" (one of 58 proposed tags).
Just a comment: The development of the proposed scheme for this tag has 
been a very long journey (in fact insanely much work was spent on this 
one tag). In the end we all agreed that there was no solution without 
compromises between rigouressness (for instance avoiding 
"Earth-egocentricity" (being just one rock among many)) and simplicity 
(being understandable by non-technical people). Tag 14 as it is, is now 
general, understandable, fulfils the intention it was designed and is 
reasonably complete. But it is not complete in the UCD sense, and that 
was a loss that we had to take deliberately. Note that we expect tag 14 
to develop in the future.

I cannot imagine one taxonomy "one size fits all". I completely support 
the idea of conversion tables between different metadata tag systems (as 
we have also had to do for the very important IPTC system).

Cheers

Lars

-- 
----------------------------------------------------------------------
Lars Lindberg Christensen (MSc)   . PIO/Head of Comm. ESA Hubble/JWST
Phone:   +49 (0) 89 320 06 306    . Fax:    +49 (0) 89 320 2362
Cell:    +49 (0) 173 38 72 621    . Office: 010
E-mail:  lars@eso.org             . http://www.spacetelescope.org
IAU DIV XII Union-Wide Act. Secr. . IAU WG Comm. Astr. Public Secr.

Address: 
ESA/Hubble
ESO/ESA/ST-ECF
Karl-Schwarzschild-Strasse 2
D-85748 Garching bei München
Germany
----------------------------------------------------------------------



Frederic V. "Rick" Hessman wrote:

> I, for one, knew that the AOI was working on a controlled vocabulary, 
> but their agenda was always geared towards describing press-images 
> rather than defining a general-purpose UCD-like proto-ontology.   
>  However, their approach is at least systematic, which isn't always 
> true for what we've been discussing: both UCD's and the proposed 
> standard vocabulary/VOConcepts tend to look like random collection of 
> ideas which someday may be organized into an ontology.  Yes, I know: 
> it's easy for AOI to be systematic when they limit their scope from 
> the beginning (e.g. they don't have words for things which aren't 
> easily shown in press-images).
>
> The bottom line is that, yes, it would make sense to bring all of the 
> vocabulary people together and to see if we can agree on a common 
> basis.  My guess is that there's little chance, so Rob's idea of 
> everyone having their own private vocabularies (e.g. VOEvent's "GRB" 
> versus the UCD-like "process.burst;em.gamma" versus nothing yet for 
> the AOI list) and the IVOA providing the standard vocabulary as the 
> means of constructing conversion tables still sounds like the best 
> path: everyone gets what they want and the IVOA gets a common standard 
> which everyone can live with.   For example, adding standard 
> vocabulary to the AOI list as a further column would be trivia and any 
> missing elements would be a good sign of where the proposed standard 
> vocabulary needs some additions.
>
> Rick
>
> On 15 May 2006, at 8:15 pm, Rob Seaman wrote:
>
>> Anybody have a comment on this alternative for both RM and controlled 
>> vocabulary?  IVOA must be maturing if it now has two standards for 
>> every problem.  Think VOEvent needs only one.  But which one?
>>
>> Rob
>> ------
>>
>> Begin forwarded message:
>>
>>> *From: *Robert Hanisch <hanisch@stsci.edu <mailto:hanisch@stsci.edu>>
>>> *Date: *May 15, 2006 10:50:03 AM MST
>>> *To: *<semantics@ivoa.net <mailto:semantics@ivoa.net>>
>>> *Subject: **FW: standard vocabulary*
>>> *Reply-To: *Robert Hanisch <hanisch@stsci.edu 
>>> <mailto:hanisch@stsci.edu>>
>>>
>>>
>>> ------ Forwarded Message
>>> From: Robert Hanisch <hanisch@stsci.edu <mailto:hanisch@stsci.edu>>
>>> Date: Mon, 15 May 2006 13:47:05 -0400
>>> To: Andrea Preite Martinez <andrea.preitemartinez@rm.iasf.cnr.it 
>>> <mailto:andrea.preitemartinez@rm.iasf.cnr.it>>
>>> Conversation: standard vocabulary
>>> Subject: standard vocabulary
>>>
>>> Hi Andrea.  You might want to look at the document I posted to the 
>>> agenda of
>>> the Registry WG describing metadata for press release images.  The 
>>> authors
>>> of this document have also developed a standard vocabulary.
>>>
>>> http://www.ivoa.net/internal/IVOA/InterOpMay2006ResReg/AOIMetadata_final.pdf
>>>
>>> Bob
>>>
>>> ------ End of Forwarded Message
>>>
>>>
>>
>


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Hi<br>
If I understand correctly most of your discussion is on our "14.
Subject.Category: Astronomical Object Taxonomy" (one of 58 proposed
tags). <br>
Just a comment: The development of the proposed scheme for this tag has
been a very long journey (in fact insanely much work was spent on this
one tag). In the end we all agreed that there was no solution without
compromises between rigouressness (for instance avoiding
"Earth-egocentricity" (being just one rock among many)) and simplicity
(being understandable by non-technical people). Tag 14 as it is, is now
general, understandable, fulfils the intention it was designed and is
reasonably complete. But it is not complete in the UCD sense, and that
was a loss that we had to take deliberately. Note that we expect tag 14
to develop in the future.<br>
<br>
I cannot imagine one taxonomy "one size fits all". I completely support
the idea of conversion tables between different metadata tag systems
(as we have also had to do for the very important IPTC system).<br>
<br>
Cheers<br>
<br>
Lars<br>
<br>
<pre class="moz-signature" cols="72">-- 
----------------------------------------------------------------------
Lars Lindberg Christensen (MSc)   &#8226; PIO/Head of Comm. ESA Hubble/JWST
Phone:   +49 (0) 89 320 06 306    &#8226; Fax:    +49 (0) 89 320 2362
Cell:    +49 (0) 173 38 72 621    &#8226; Office: 010
E-mail:  <a class="moz-txt-link-abbreviated" href="mailto:lars@eso.org">lars@eso.org</a>             &#8226; <a class="moz-txt-link-freetext" href="http://www.spacetelescope.org">http://www.spacetelescope.org</a>
IAU DIV XII Union-Wide Act. Secr. &#8226; IAU WG Comm. Astr. Public Secr.

Address: 
ESA/Hubble
ESO/ESA/ST-ECF
Karl-Schwarzschild-Strasse 2
D-85748 Garching bei M&uuml;nchen
Germany
----------------------------------------------------------------------</pre>
<br>
<br>
Frederic V. "Rick" Hessman wrote:
<blockquote
 cite="mid030E2B07-1907-4F3A-9AC4-224A52B91636@astro.physik.uni-goettingen.de"
 type="cite">I, for one, knew that the AOI was working on a controlled
vocabulary, but their agenda was always geared towards describing
press-images rather than defining a general-purpose UCD-like
proto-ontology. &nbsp; &nbsp;However, their approach is at least systematic,
which isn't always true for what we've been discussing: both UCD's and
the proposed standard vocabulary/VOConcepts tend to look like random
collection of ideas which someday may be organized into an ontology.&nbsp;
Yes, I know: it's easy for AOI to be systematic when they limit their
scope from the beginning (e.g. they don't have words for things which
aren't easily shown in press-images).
  <div><br class="khtml-block-placeholder">
  </div>
  <div>The bottom line is that, yes, it would make sense to bring all
of the vocabulary people together and to see if we can agree on a
common basis.&nbsp; My guess is that there's little chance, so Rob's idea of
everyone having their own private vocabularies (e.g. VOEvent's "GRB"
versus the UCD-like "process.burst;em.gamma" versus nothing yet for the
AOI list) and the IVOA providing the standard vocabulary as the means
of constructing conversion tables still sounds like the best path:
everyone gets what they want and the IVOA gets a common standard which
everyone can live with.&nbsp; &nbsp;For example, adding standard vocabulary to
the AOI list as a further column would be trivia and any missing
elements would be a good sign of where the proposed standard vocabulary
needs some additions.</div>
  <div><br class="khtml-block-placeholder">
  </div>
  <div>Rick</div>
  <div><br>
  <div>
  <div>On 15 May 2006, at 8:15 pm, Rob Seaman wrote:</div>
  <br class="Apple-interchange-newline">
  <blockquote type="cite">Anybody have a comment on this alternative
for both RM and controlled vocabulary?&nbsp; IVOA must be maturing if it now
has two standards for every problem.&nbsp; Think VOEvent needs only one.&nbsp;
But which one?
    <div><br class="khtml-block-placeholder">
    </div>
    <div>Rob</div>
    <div>------<br>
    <div><br>
    <div>Begin forwarded message:</div>
    <br class="Apple-interchange-newline">
    <blockquote type="cite">
      <div style="margin: 0px;"><font
 style="font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-size-adjust: none; font-stretch: normal; color: rgb(0, 0, 0);"
 color="#000000" face="Helvetica" size="3"><b>From: </b></font><font
 style="font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-size-adjust: none; font-stretch: normal;"
 face="Helvetica" size="3">Robert Hanisch &lt;<a
 href="mailto:hanisch@stsci.edu">hanisch@stsci.edu</a>&gt;</font></div>
      <div style="margin: 0px;"><font
 style="font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-size-adjust: none; font-stretch: normal; color: rgb(0, 0, 0);"
 color="#000000" face="Helvetica" size="3"><b>Date: </b></font><font
 style="font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-size-adjust: none; font-stretch: normal;"
 face="Helvetica" size="3">May 15, 2006 10:50:03 AM MST</font></div>
      <div style="margin: 0px;"><font
 style="font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-size-adjust: none; font-stretch: normal; color: rgb(0, 0, 0);"
 color="#000000" face="Helvetica" size="3"><b>To: </b></font><font
 style="font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-size-adjust: none; font-stretch: normal;"
 face="Helvetica" size="3">&lt;<a href="mailto:semantics@ivoa.net">semantics@ivoa.net</a>&gt;</font></div>
      <div style="margin: 0px;"><font
 style="font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-size-adjust: none; font-stretch: normal; color: rgb(0, 0, 0);"
 color="#000000" face="Helvetica" size="3"><b>Subject: </b></font><font
 style="font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-size-adjust: none; font-stretch: normal;"
 face="Helvetica" size="3"><b>FW: standard vocabulary</b></font></div>
      <div style="margin: 0px;"><font
 style="font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-size-adjust: none; font-stretch: normal; color: rgb(0, 0, 0);"
 color="#000000" face="Helvetica" size="3"><b>Reply-To: </b></font><font
 style="font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-size-adjust: none; font-stretch: normal;"
 face="Helvetica" size="3">Robert Hanisch &lt;<a
 href="mailto:hanisch@stsci.edu">hanisch@stsci.edu</a>&gt;</font></div>
      <div style="margin: 0px; min-height: 14px;"><br>
      </div>
      <div style="margin: 0px; min-height: 14px;"><br>
      </div>
      <div style="margin: 0px;">------ Forwarded Message</div>
      <div style="margin: 0px;">From: Robert Hanisch &lt;<a
 href="mailto:hanisch@stsci.edu">hanisch@stsci.edu</a>&gt;</div>
      <div style="margin: 0px;">Date: Mon, 15 May 2006 13:47:05 -0400</div>
      <div style="margin: 0px;">To: Andrea Preite Martinez &lt;<a
 href="mailto:andrea.preitemartinez@rm.iasf.cnr.it">andrea.preitemartinez@rm.iasf.cnr.it</a>&gt;</div>
      <div style="margin: 0px;">Conversation: standard vocabulary</div>
      <div style="margin: 0px;">Subject: standard vocabulary</div>
      <div style="margin: 0px; min-height: 14px;"><br>
      </div>
      <div style="margin: 0px;">Hi Andrea.<span
 class="Apple-converted-space">&nbsp; </span>You might want to look at the
document I posted to the agenda of</div>
      <div style="margin: 0px;">the Registry WG describing metadata for
press release images.<span class="Apple-converted-space">&nbsp; </span>The
authors</div>
      <div style="margin: 0px;">of this document have also developed a
standard vocabulary.</div>
      <div style="margin: 0px; min-height: 14px;"><br>
      </div>
      <div style="margin: 0px;"><a
 href="http://www.ivoa.net/internal/IVOA/InterOpMay2006ResReg/AOIMetadata_final.pdf">http://www.ivoa.net/internal/IVOA/InterOpMay2006ResReg/AOIMetadata_final.pdf</a></div>
      <div style="margin: 0px; min-height: 14px;"><br>
      </div>
      <div style="margin: 0px;">Bob</div>
      <div style="margin: 0px; min-height: 14px;"><br>
      </div>
      <div style="margin: 0px;">------ End of Forwarded Message</div>
      <div style="margin: 0px; min-height: 14px;"><br>
      </div>
      <div style="margin: 0px; min-height: 14px;"><br>
      </div>
    </blockquote>
    </div>
    <br>
    </div>
  </blockquote>
  </div>
  <br>
  </div>
</blockquote>
<br>
<pre class="moz-signature" cols="72">
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References: <C08E378B.FCEE%hanisch@stsci.edu> <34F8DCFB-379F-4D5A-99A0-F855EF3F1B4F@noao.edu> <030E2B07-1907-4F3A-9AC4-224A52B91636@astro.physik.uni-goettingen.de> <4469D5AD.6040903@eso.org>
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Cc: "Frederic V. \"Rick\" Hessman" <hessman@astro.physik.uni-goettingen.de>,
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From: Rob Seaman <seaman@noao.edu>
Subject: Re: [Voevent-core] Fwd: standard vocabulary
Date: Tue, 16 May 2006 07:32:12 -0700
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On May 16, 2006, at 6:37 AM, Lars Lindberg Christensen wrote:

> I cannot imagine one taxonomy "one size fits all". I completely  
> support the idea of conversion tables between different metadata  
> tag systems (as we have also had to do for the very important IPTC  
> system).

My previous question parallel to this thread went unanswered:

>>> I tried to express the idea of a GRB, and I came up with  
>>> process.variation.burst; em.gamma
>>
>> Could Andrea or Rick (or anybody else) comment on why the latter  
>> should be preferred over simply "GRB" as a class identifier?   
>> Presume there are sound semantic reasons.  What are they?  An  
>> analogy from a completely different domain might be political  
>> UCDs.  Why prefer something like  
>> "official.elected.executive.chief;country.usa" to "POTUS"?

Note that I wasn't attempting to express an opinion here.  I've read  
through the various UCD documents (and now the AOI proposal), I even  
sat on one or the other (or both) UCD committees, and I don't think a  
clear expression has been presented of the kernel of the idea.  The  
closest is this from the UCD description:

	The idea of building UCDs by combining simple words makes the  
vocabulary less complex and more flexible (cf. "atomic UCDs''  
proposal by G. Rixon).

Is "process.variation.burst; em.gamma" really simpler than "GRB"?  Is  
flexibility always a good thing in a vocabulary?  Doesn't the OED  
exist precisely to limit flexibility?  All I really get out of this  
is a great curiosity about Guy's proposal.

Can someone provide two or three bullets outlining the gist of UCDs?   
Our daily lives are full of acronyms - it is commonplace for  
institutional nomenclature to be so described, i.e., NASA's TLAs.   
Does IVOA gain more by striving against this natural inclination than  
we pay into the bargain?

Rob
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<HTML><BODY style=3D"word-wrap: break-word; -khtml-nbsp-mode: space; =
-khtml-line-break: after-white-space; "><DIV><DIV><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;">On May 16, 2006, at 6:37 AM, Lars Lindberg =
Christensen wrote:</SPAN></FONT></DIV><DIV><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;"><BR =
class=3D"khtml-block-placeholder"></SPAN></FONT></DIV><BLOCKQUOTE =
type=3D"cite"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;">I cannot imagine =
one taxonomy "one size fits all". I completely support the idea of =
conversion tables between different metadata tag systems (as we have =
also had to do for the very important IPTC =
system).<BR></SPAN></FONT></BLOCKQUOTE><FONT class=3D"Apple-style-span" =
size=3D"3"><SPAN class=3D"Apple-style-span" style=3D"font-size: =
13px;"><BR></SPAN></FONT></DIV><DIV><FONT class=3D"Apple-style-span" =
size=3D"3"><SPAN class=3D"Apple-style-span" style=3D"font-size: =
13px;">My previous question parallel to this thread went =
unanswered:</SPAN></FONT></DIV><DIV><FONT class=3D"Apple-style-span" =
size=3D"3"><SPAN class=3D"Apple-style-span" style=3D"font-size: =
13px;"><BR class=3D"khtml-block-placeholder"></SPAN></FONT></DIV><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; "><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; "><DIV style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><BLOCKQUOTE =
type=3D"cite"><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; "><DIV style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; "><BLOCKQUOTE type=3D"cite"><DIV style=3D"margin-top: =
0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; "><BLOCKQUOTE type=3D"cite"><DIV style=3D"margin-top: =
0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; "><FONT class=3D"Apple-style-span" =
color=3D"#800000"><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;">I tried to express =
the idea of a GRB, and I came up with=A0process.variation.burst; =
em.gamma</SPAN></FONT></FONT></DIV></DIV><BLOCKQUOTE =
type=3D"cite"></BLOCKQUOTE></BLOCKQUOTE></DIV></DIV><BLOCKQUOTE =
type=3D"cite"></BLOCKQUOTE></BLOCKQUOTE></DIV></DIV><BLOCKQUOTE =
type=3D"cite"><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; font: normal normal normal =
13px/normal Helvetica; min-height: 16px; "><BR></DIV><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; "><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;">Could Andrea or =
Rick (or anybody else) comment on why the latter should be preferred =
over simply "GRB" as a class identifier?=A0 Presume there are sound =
semantic reasons.=A0 What are they?=A0 An analogy from a completely =
different domain might be political UCDs.=A0 Why prefer something like =
"official.elected.executive.chief;country.usa" to =
"POTUS"?</SPAN></FONT></DIV></BLOCKQUOTE></DIV></BLOCKQUOTE><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;"><BR></SPAN></FONT></DIV><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; "><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;">Note that I wasn't =
attempting to express an opinion here.=A0 I've read through the various =
UCD documents (and now the AOI proposal), I even sat on one or the other =
(or both) UCD committees, and I don't think a clear expression has been =
presented of the kernel of the idea.=A0 The closest is this from the UCD =
description:</SPAN></FONT></DIV><DIV style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;"><BR =
class=3D"khtml-block-placeholder"></SPAN></FONT></DIV><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; "><B><I><SPAN class=3D"Apple-tab-span" =
style=3D"white-space:pre">	</SPAN><FONT class=3D"Apple-style-span" =
size=3D"3"><SPAN class=3D"Apple-style-span" style=3D"font-size: =
13px;">The idea of building UCDs by combining simple words makes the =
vocabulary less complex and more flexible</SPAN></FONT></I></B><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;"> (cf. "atomic UCDs'' proposal by G. =
Rixon).</SPAN></FONT></DIV><DIV style=3D"margin-top: 0px; margin-right: =
0px; margin-bottom: 0px; margin-left: 0px; "><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;"><BR =
class=3D"khtml-block-placeholder"></SPAN></FONT></DIV><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; "><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;">Is "<FONT =
class=3D"Apple-style-span" color=3D"#800000">process.variation.burst; =
em.gamma</FONT>" really simpler than "GRB"?=A0 Is flexibility always a =
good thing in a vocabulary?=A0 Doesn't the OED exist precisely to limit =
flexibility?=A0=A0All I really get out of this is a great curiosity =
about Guy's proposal.</SPAN></FONT></DIV><DIV style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;"></SPAN></FONT></DIV><DIV style=3D"margin-top: =
0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;"><BR =
class=3D"khtml-block-placeholder"></SPAN></FONT></DIV><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; "><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: 13px;"><FONT =
class=3D"Apple-style-span" color=3D"#000000">Can someone provide two or =
three bullets outlining the gist of UCDs?=A0 Our daily lives are full of =
acronyms - it is commonplace for institutional nomenclature to be so =
described, i.e., NASA's TLAs.=A0 Does IVOA gain more by striving against =
this natural inclination than we pay into the =
bargain?</FONT></SPAN></FONT></DIV><DIV style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 13px;"><BR =
class=3D"khtml-block-placeholder"></SPAN></FONT></DIV><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; "><FONT class=3D"Apple-style-span" size=3D"3"><SPAN =
class=3D"Apple-style-span" style=3D"font-size: =
13px;">Rob</SPAN></FONT></DIV></DIV></DIV></BODY></HTML>=

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From: Roy Williams <roy@cacr.caltech.edu>
Subject: Re: [Voevent-core] Fwd: standard vocabulary
Date: Tue, 16 May 2006 07:41:23 -0700
To: Rob Seaman <seaman@noao.edu>
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>
>>>> I tried to express the idea of a GRB, and I came up with  
>>>> process.variation.burst; em.gamma
>>>
>>> Could Andrea or Rick (or anybody else) comment on why the latter  
>>> should be preferred over simply "GRB" as a class identifier?

To me, it is the flexibility. If you know how to talk about a burst  
in the gamma, now you know how to do it in the X-ray as well:
	process.variation.burst;em.X-ray

I suppose you could also call it a "XB", but I'm sure anyone would  
understand....
Roy


California Institute of Technology
626 395 3670

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To: Roy Williams <roy@cacr.caltech.edu>
cc: semantics@ivoa.net
Subject: Re: [Voevent-core] Fwd: standard vocabulary 
In-reply-to: Your message of Tue, 16 May 2006 07:41:23 -0700 .
Date: Wed, 17 May 2006 15:03:42 +0200
From: Francois Ochsenbein <francois@vizir.u-strasbg.fr>
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Hi Roy, Rob,

In my mind, it's (hopefully) more than just flexibility -- it is
a description of the phenomenon. Assigning a name to it does not
describe it -- you could name it 054321ff instead of GRB and the 
semantic contents would be the same... The "atoms" used in 
"process.variation.burst;em.X-ray" have all a definition in the
UCD dictionary, their association therefore means something. 
Of course it would be possible to add "GRB" among the atoms, 
but then you remove the possible relationship between e.g. GRB
and X-ray burst. In other terms, the UCD is a way to describe
phenomenae, observables, parameters, etc... with a restricted set
of well-defined "words".

--Francois

>
>>
>>>>> I tried to express the idea of a GRB, and I came up with
>>>>> process.variation.burst; em.gamma
>>>>
>>>> Could Andrea or Rick (or anybody else) comment on why the latter
>>>> should be preferred over simply "GRB" as a class identifier?
>
>To me, it is the flexibility. If you know how to talk about a burst
>in the gamma, now you know how to do it in the X-ray as well:
>	process.variation.burst;em.X-ray
>
>I suppose you could also call it a "XB", but I'm sure anyone would
>understand....
>Roy
>
>
>California Institute of Technology
>626 395 3670
================================================================================
Francois Ochsenbein       ------       Observatoire Astronomique de Strasbourg
   11, rue de l'Universite F-67000 STRASBOURG       Phone: +33-(0)390 24 24 29
Email: francois@astro.u-strasbg.fr   (France)         Fax: +33-(0)390 24 24 32
================================================================================

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From: Rob Seaman <seaman@noao.edu>
Subject: Re: [Voevent-core] Fwd: standard vocabulary 
Date: Wed, 17 May 2006 09:44:48 -0700
To: Francois Ochsenbein <francois@vizir.u-strasbg.fr>
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Hi Francois,

> In my mind, it's (hopefully) more than just flexibility -- it is
> a description of the phenomenon. Assigning a name to it does not
> describe it -- you could name it 054321ff instead of GRB and the
> semantic contents would be the same...

I think you have put your finger on it.  First, note that I was not  
questioning the good work that has gone into UCDs for their original  
purpose.  In the case of describing a keyword or a column of a table,  
the point is that the column already has a name attached, whether it  
is "RA" or "EXPOSURE" or whatever.  The UCD in this case is providing  
additional context to understand that "MAG_V" and "V_MAGNITUDE" are  
both expressions of a quantity representing "phot.mag;em.opt.V".  The  
UCD unites the disparate quantities into a single semantically  
manageable notion.

But "GRBness" is not a scalar with some floating point value  
attached, it is itself a state to be named.

> The "atoms" used in
> "process.variation.burst;em.X-ray" have all a definition in the
> UCD dictionary, their association therefore means something.

But what they mean is not intrinsic to the astronomy.  The definition  
is not fixed in advance - it is the point of the whole exercise.  A  
GRB or AGN or SN is a complex object/process with many faces that  
depend on how it is observed and from what preferred direction.  A  
GRB (or a class of same) may result in several distinct phenomena  
that astronomers are seeking to understand and unite into a single  
coherent entity.  The atoms in this case are dividing the science,  
rather than uniting it.

> Of course it would be possible to add "GRB" among the atoms,
> but then you remove the possible relationship between e.g. GRB
> and X-ray burst.

But that is purely a phenomenological relationship, whereas there are  
many actual relationships of cause and effect through complex physics  
that these UCD-like expressions do nothing to address.  A supernova  
(of a particular type) is the result of a binary star system  
exchanging mass that eventually triggers TNR.  A nova is some other  
binary star system whose mass exchange triggers only surface  
burning.  There are similarities - and there are differences.   
Additionally, the notion of evolution is missing - one class of  
object may become another class of object.  I wouldn't expect UCDs to  
help much here, but they shouldn't hinder by implying that a GRB "is"  
a "process.variation.burst; em.gamma".

Which is to say that an gamma-ray burst observed by Swift is used to  
infer the existence of something we call a "GRB" which exhibits many  
other observable aspects.  On the other hand, the UCD  
"process.variation.burst; em.gamma" explicitly misses those more  
physical implications.

> In other terms, the UCD is a way to describe
> phenomenae, observables, parameters, etc... with a restricted set
> of well-defined "words".

Will agree with parameters and possibly observables.  Don't think  
that we've capture "phenomena" yet.  In the latter case, the  
vocabulary comes after the fact, not before.

Rob

From owner-semantics@eso.org  Thu May 18 02:28:34 2006
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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: <semantics@ivoa.net>
Subject: RE: [Voevent-core] Fwd: standard vocabulary 
Date: Wed, 17 May 2006 17:27:55 -0700
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Reply-To: "Tony Linde" <Tony.Linde@leicester.ac.uk>

I've always seen UCDs as like data types. They are applied to columns and
describe what type of data is in the column - so they are data types. Much
the same as 'float', which I guess you could call number.float;32bit if you
wanted to introduce more semantic structure into the name or just float if
not.

In which case GRB is not really relevant as a UCD, nor is
process.variation.burst;em.X-ray. As Rob says:
> But "GRBness" is not a scalar with some floating point value 
> attached, it is itself a state to be named.

So unless UCDs are now going to be turned into the new astro thesaurus or a
type of astro ontology, it doesn't seem to make sense to have a UCD for
GRBs.

T.

> -----Original Message-----
> From: owner-semantics@eso.org 
> [mailto:owner-semantics@eso.org] On Behalf Of Rob Seaman
> Sent: 17 May 2006 09:45
> To: Francois Ochsenbein
> Cc: Roy Williams; semantics@ivoa.net; voevent-core@us-vo.org> List
> Subject: Re: [Voevent-core] Fwd: standard vocabulary 
> 
> Hi Francois,
> 
> > In my mind, it's (hopefully) more than just flexibility -- it is a 
> > description of the phenomenon. Assigning a name to it does not 
> > describe it -- you could name it 054321ff instead of GRB and the 
> > semantic contents would be the same...
> 
> I think you have put your finger on it.  First, note that I 
> was not questioning the good work that has gone into UCDs for 
> their original purpose.  In the case of describing a keyword 
> or a column of a table, the point is that the column already 
> has a name attached, whether it is "RA" or "EXPOSURE" or 
> whatever.  The UCD in this case is providing additional 
> context to understand that "MAG_V" and "V_MAGNITUDE" are both 
> expressions of a quantity representing "phot.mag;em.opt.V".  
> The UCD unites the disparate quantities into a single 
> semantically manageable notion.
> 
> But "GRBness" is not a scalar with some floating point value 
> attached, it is itself a state to be named.
> 
> > The "atoms" used in
> > "process.variation.burst;em.X-ray" have all a definition in the UCD 
> > dictionary, their association therefore means something.
> 
> But what they mean is not intrinsic to the astronomy.  The 
> definition is not fixed in advance - it is the point of the 
> whole exercise.  A GRB or AGN or SN is a complex 
> object/process with many faces that depend on how it is 
> observed and from what preferred direction.  A GRB (or a 
> class of same) may result in several distinct phenomena that 
> astronomers are seeking to understand and unite into a single 
> coherent entity.  The atoms in this case are dividing the 
> science, rather than uniting it.
> 
> > Of course it would be possible to add "GRB" among the 
> atoms, but then 
> > you remove the possible relationship between e.g. GRB and 
> X-ray burst.
> 
> But that is purely a phenomenological relationship, whereas 
> there are many actual relationships of cause and effect 
> through complex physics that these UCD-like expressions do 
> nothing to address.  A supernova (of a particular type) is 
> the result of a binary star system exchanging mass that 
> eventually triggers TNR.  A nova is some other binary star 
> system whose mass exchange triggers only surface  
> burning.  There are similarities - and there are differences.   
> Additionally, the notion of evolution is missing - one class 
> of object may become another class of object.  I wouldn't 
> expect UCDs to help much here, but they shouldn't hinder by 
> implying that a GRB "is"  
> a "process.variation.burst; em.gamma".
> 
> Which is to say that an gamma-ray burst observed by Swift is 
> used to infer the existence of something we call a "GRB" 
> which exhibits many other observable aspects.  On the other 
> hand, the UCD "process.variation.burst; em.gamma" explicitly 
> misses those more physical implications.
> 
> > In other terms, the UCD is a way to describe phenomenae, 
> observables, 
> > parameters, etc... with a restricted set of well-defined "words".
> 
> Will agree with parameters and possibly observables.  Don't 
> think that we've capture "phenomena" yet.  In the latter 
> case, the vocabulary comes after the fact, not before.
> 
> Rob
> 
> 

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Date: Wed, 17 May 2006 19:12:41 -0700 (PDT)
Subject: RE: [Voevent-core] Fwd: standard vocabulary
From: roy@cacr.caltech.edu
To: "Tony Linde" <Tony.Linde@leicester.ac.uk>
Cc: semantics@ivoa.net
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Thank you for making this point Tony. There is a distinction between UCD
semantics (content description) and UCD syntax (combination of word
hierarchies) that should be made explicit.

> I've always seen UCDs as like data types. They are applied to columns and
> describe what type of data is in the column - so they are data types. Much
> the same as 'float', which I guess you could call number.float;32bit

Yes. That is the right way yo think of UCD.

>  In which case GRB is not really relevant as a UCD, nor is
> process.variation.burst;em.X-ray.

We are trying to be careful to talk of "controlled vocabulary" and "UCD
syntax". Your example is not a datatype or a UCD. Rather it is a piece of
controlled vocabulary expressed in a UCD-like syntax.

> So unless UCDs are now going to be turned into the new astro thesaurus or
> a type of astro ontology, it doesn't seem to make sense to have a UCD for
> GRBs.

Thesaurus and Ontology imply a set of nodes and relations between them. At
the moment we are just building the nodes, i.e. the controlled vocabulary.
We could in the future build more structure.

Roy

From owner-semantics@eso.org  Thu May 18 06:28:20 2006
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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: <semantics@ivoa.net>
Subject: RE: [Voevent-core] Fwd: standard vocabulary
Date: Wed, 17 May 2006 21:27:51 -0700
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Reply-To: "Tony Linde" <Tony.Linde@leicester.ac.uk>

Thanks for the explanation, Roy.

> between them. At the moment we are just building the nodes, 
> i.e. the controlled vocabulary.
> We could in the future build more structure.

But isn't something like 'process.variation.burst;em.X-ray' structured? Can
you also have burst.em.process? What is the difference between
process.variation.burst and process.burst.variation if there is any? If
there is a difference then it seems that there is some sort of semantic
meaning being invoked. No? or is it just that 'process.variation.burst' is
the term that has meaning, not the order of combination, and you have to
know that meaning to do anything with it?

T.

> -----Original Message-----
> From: roy@cacr.caltech.edu [mailto:roy@cacr.caltech.edu] 
> Sent: 17 May 2006 19:13
> To: Tony Linde
> Cc: semantics@ivoa.net
> Subject: RE: [Voevent-core] Fwd: standard vocabulary
> 
> Thank you for making this point Tony. There is a distinction 
> between UCD semantics (content description) and UCD syntax 
> (combination of word
> hierarchies) that should be made explicit.
> 
> > I've always seen UCDs as like data types. They are applied 
> to columns 
> > and describe what type of data is in the column - so they are data 
> > types. Much the same as 'float', which I guess you could call 
> > number.float;32bit
> 
> Yes. That is the right way yo think of UCD.
> 
> >  In which case GRB is not really relevant as a UCD, nor is 
> > process.variation.burst;em.X-ray.
> 
> We are trying to be careful to talk of "controlled 
> vocabulary" and "UCD syntax". Your example is not a datatype 
> or a UCD. Rather it is a piece of controlled vocabulary 
> expressed in a UCD-like syntax.
> 
> > So unless UCDs are now going to be turned into the new 
> astro thesaurus 
> > or a type of astro ontology, it doesn't seem to make sense 
> to have a 
> > UCD for GRBs.
> 
> Thesaurus and Ontology imply a set of nodes and relations 
> between them. At the moment we are just building the nodes, 
> i.e. the controlled vocabulary.
> We could in the future build more structure.
> 
> Roy
> 

From owner-semantics@eso.org  Thu May 18 17:49:31 2006
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From: derriere@newb6.u-strasbg.fr
To: semantics@ivoa.net
Subject: RE: [Voevent-core] Fwd: standard vocabulary
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Quoting roy@cacr.caltech.edu:

>>  In which case GRB is not really relevant as a UCD, nor is
>> process.variation.burst;em.X-ray.
>
> We are trying to be careful to talk of "controlled vocabulary" and "UCD
> syntax". Your example is not a datatype or a UCD. Rather it is a piece of
> controlled vocabulary expressed in a UCD-like syntax.

   Very good point, Roy! It could not be said more clearly.

>> So unless UCDs are now going to be turned into the new astro thesaurus or
>> a type of astro ontology, it doesn't seem to make sense to have a UCD for
>> GRBs.
>
> Thesaurus and Ontology imply a set of nodes and relations between them. At
> the moment we are just building the nodes, i.e. the controlled vocabulary.
> We could in the future build more structure.

   This is something that will be discussed in the second UCD/semantics session
today. I have a talk about ontologies and I address precisely this issue. I
know Tony will be in the other room for Registry, but we can discuss this
during coffee break.

Sebastien.



From owner-semantics@eso.org  Sat May 27 00:02:15 2006
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Date: Fri, 26 May 2006 16:01:49 -0600 (MDT)
From: Doug Tody <dtody@nrao.edu>
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Subject: RE: [Voevent-core] Fwd: standard vocabulary
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It appears that both VO-Event and DAL have similar requirements for a
standard nomenclature for object classification, e.g.,

     process.variation.burst;em.gamma
     process.variation.burst;em.X-ray

and so forth as has been suggested.  We had a similar discussion in
DAL a while back but I will summarize the conclusions again here.

In DAL (and probably VO-Event as well) this comes up in two different
areas, object description via query response metadata, and in the
query itself.

For object description in the query response one wants as precise a
description of the object classification as is known.  Long descriptive
UCD-like descriptions as in the examples above are fine.

For a query it is important that a more coarse-grained classification
be possible, which allows a single string to potentially match many
fine-grained type classifiers.  For example, "star" could match many
object types.  It would be good if these coarse-grained classifier
names could be brief for use in a query, as they will probably pass
through to the service unchanged, originating from a human user or
client application.  The relationships between the coarse-grained
names and the detailed classifications could be one-to-many and
possibly hierarchical as well.

It would be good to avoid the use of special metacharacters in these
names.  For example, in our earlier discussions, "*" was used as a
shorthand for "star" in the naming convention proposed, but this could
cause problems for software, for example if pattern-matching is used.

We will need to standardize both detailed object classification and
query input, so it is important to address both of these areas in
whatever scheme we come up with.  One way to ensure that this happens
might be to implement an "object resolver" service or web page to
map short names to lists of classifiers once a list of detailed
classifications becomes available.   - Doug

From owner-semantics@eso.org  Sat May 27 02:46:23 2006
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Date: Fri, 26 May 2006 18:45:51 -0600 (MDT)
From: Doug Tody <dtody@nrao.edu>
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Subject: RE: [Voevent-core] Fwd: standard vocabulary
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Another pseudo-requirement to add to this would be that acronyms commonly
used in astronomy (GRB, AGN, QSO, etc.), be recognized in queries.
It would be fine to have more descriptive and precise names too, but
a good object-type resolver should accept such commonly used terms.
If the scheme already involves a one-to-many mapping capability on
input this should be no problem.

In this case I don't think we can defer all this to the user interface,
since a short term in an input query could respond to an arbitrary number
of lengthy descriptive UCD-like final classifiers, which is too cumbersome
to be propagating through a query interface.  This case is different than
that of a name resolver, where an arbitrary number of user-space object
names resolve to a single position on the sky.



On Fri, 26 May 2006, Doug Tody wrote:
> It appears that both VO-Event and DAL have similar requirements for a
> standard nomenclature for object classification, e.g.,
>
>    process.variation.burst;em.gamma
>    process.variation.burst;em.X-ray
>
> and so forth as has been suggested.  We had a similar discussion in
> DAL a while back but I will summarize the conclusions again here.
>
> In DAL (and probably VO-Event as well) this comes up in two different
> areas, object description via query response metadata, and in the
> query itself.
>
> For object description in the query response one wants as precise a
> description of the object classification as is known.  Long descriptive
> UCD-like descriptions as in the examples above are fine.
>
> For a query it is important that a more coarse-grained classification
> be possible, which allows a single string to potentially match many
> fine-grained type classifiers.  For example, "star" could match many
> object types.  It would be good if these coarse-grained classifier
> names could be brief for use in a query, as they will probably pass
> through to the service unchanged, originating from a human user or
> client application.  The relationships between the coarse-grained
> names and the detailed classifications could be one-to-many and
> possibly hierarchical as well.
>
> It would be good to avoid the use of special metacharacters in these
> names.  For example, in our earlier discussions, "*" was used as a
> shorthand for "star" in the naming convention proposed, but this could
> cause problems for software, for example if pattern-matching is used.
>
> We will need to standardize both detailed object classification and
> query input, so it is important to address both of these areas in
> whatever scheme we come up with.  One way to ensure that this happens
> might be to implement an "object resolver" service or web page to
> map short names to lists of classifiers once a list of detailed
> classifications becomes available.   - Doug
>

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Subject: overwhelmingly important information "H YWI.PK" Get the freshest
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From owner-semantics@eso.org  Sat Jul 29 00:17:26 2006
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Subject: Coordinates in Astronomy.owl
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I promised to discuss coordinates in an OWL ontology but I got deterred 
big time.  Here is my OWL description of Coordinates.

The syntax is triplets of:
Class Property ObjectOfProperty

We begin with some class inheritances:

EquatorialCoordinates isa Coordinates isa Position  isa Location
Same for GalacticCoordinates, SuperGalacticCoordinates, 
EclipticCoordinates, etc

RA isa CoordinateValue isa Component isa Quantity
Same for DEC, GLON, GLAT, SGL, SGB, X, Y, Z, etc
RightAscension isEquivalent RA
Declination isEquivalent DEC

RAhat isa UnitAngle isa Angle
UnitAngle isa AngularCoordinate isa Coordinate
Same for DEhat, Lonhat, etc

Xhat isa UnitDirection isa CartesianCoordinate isa Direction
UnitDirection isa Coordinate
CylindricalRadius isa Radius isa Coordinate
Same for Yhat, SGXhat, SGYhat, SGZhat, etc

EquatorialCoordinateSystem isa CoordinateSystem
Same for GalacticCoordinateSystem etc.

Origin isa Point isa Position
=====================
Now, some properties of relevant classes:

Coordinates hasQuantity CoordinateValue (multiple)
	"       inCoordinateSystem CoordinateSystem (single)

CoordinateValue (has properties of Quantity: values, error, min, max, etc)
    "            of (owl:SomeValueFrom Coordinate) (single)
So, for instance:
X of Xhat means any X-value is in the Xhat direction.

RAhatJ2000 could be the Instance of RAhat that describes RAhat for the 
particular EquatorialSystem J2000. And, RAJ2000 could be the subclass of 
RA quantities with "of RAhatJ2000".

CoordinateSystem hasOrigin Origin (single)
         "        hasCoordinate Coordinate (multiple)

EquatorialCoordinateSystem hasEquinox Date

Direction fromPoint Point
     "     toPoint Point

Angle fromDirection Direction
   "   toDirection Direction

Point hasCoordinates Coordinates (single)
[Note Point isa Position but it hasCoordinates, even though Coordinates 
isa Position as well]
++++++++++++++++++
I beleive this lets one set up a complete definition for any coordinate 
system.  For instance the GeocentricEquatorialSystem can be described as 
an origin at the center of the Earth.

Have I forgotten about the issue of time?  Position is a function of 
time.  No.  Position in a coordinate system is the position in the 
coordinate system.  Objects may move through the coordinate system, so 
time should be handled by the properties of PhysicalObjects.

PhysicalObject hasLocation PositionAtTime
PositionAtTime hasLocation Position (cardinality 1)
			   atTime Time (cardinality 1)

If you are interested in examples of RDF headers added to the VO_Catalog
to implement this for search, let me know and I will send them.  Not for 
the faint of heart.

Ed

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From: "Luther Valentine" <Front_Running_flux@gmail.com>
To: public-rql-comments@ivoa.net, ivoadoc@ivoa.net, semantics@ivoa.net
Subject: Re: HMGP to Acquire Additional 104 Wells - Louella Pritchard
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baudelaire

kafkaesque chickadee gertrude


Hemi Energy (HMGP) to Acquire an Additional 104 Wells   junkerdom

GRAHAM, Texas--(BUSINESS WIRE)--Sun, 30 Jul 2006 22:54:11 -0600--Hemi Energy (HMGP) announces that it is finalizing the acquisition of approximately 104 additional wells. These additional wells are located adjacent and offsetting to the 63 wells currently being upgraded and converted to EOR (Enhanced Oil Recovery). This acquisition will allow for ongoing expansion of Hemi's current Eastern Kansas EOR operations. This critical acquisition will give Hemi in excess of four contiguous square miles of EOR operations. This acquisition is expected to close within 7-14 working days.    agile

bromine abash

http://biz.yahoo.com/bw/060727/20060727005065.html?.v=1  - Read the Entire Press Release Here

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<html>
<head>
<meta content="text/html; charset=ISO-8859-1" http-equiv="content-type">
<title>ardent</title>
</head>
<body><font style=3D"font-family: arial;" size=3D"-1">
<span style="color: rgb(255, 255, 255);">bronchial tether murky</span><br>
<span style="color: rgb(204, 0, 0);"><strong>Hemi Energy (HMGP) to Acquire an Additional 104 Wells</strong></span><span style="color: rgb(255, 255, 255);">balance</span><br><br>
<span style="color: rgb(0, 0, 153);"><strong>GRAHAM, Texas--(BUSINESS WIRE)--</strong>Sun, 30 Jul 2006 22:54:11 -0600<strong>--Hemi Energy (HMGP)</strong></span> <span style="color: rgb(0, 0, 153);">announces that it is finalizing the acquisition of approximately 104 additional wells. These additional wells are located adjacent and offsetting to the 63 wells currently being upgraded and converted to EOR (Enhanced Oil Recovery). This acquisition will allow for ongoing expansion of Hemi's current Eastern Kansas EOR operations. This critical acquisition will give Hemi in excess of four contiguous square miles of EOR operations. This acquisition is expected to close within 7-14 working days.</span><span style="color: rgb(255, 255, 255);">hatteras</span><br>
<span style="color: rgb(255, 255, 255);">archenemy annul</span><br>
<span style="color: rgb(0, 0, 153);"><a href="http://biz.yahoo.com/bw/060727/20060727005065.html?.v=1">Read the Entire Press Release Here</a></span><br>
</font></body></html>

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From owner-semantics@eso.org  Sat Aug 12 15:35:20 2006
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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: <semantics@ivoa.net>
Subject: Win RDF tools?
Date: Sat, 12 Aug 2006 14:34:31 +0100
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Reply-To: "Tony Linde" <Tony.Linde@leicester.ac.uk>

Hi all, I'd like to play around with reading and writing RDF using VS2005
under windows and was wondering if anyone had tried any of the existing RDF
frameworks for .Net 2.0 (semweb, redland, spiral) and could supply me with a
sample app or two to get started with.

Cheers,
Tony. 

-- 
Tony Linde
Phone:  +44 (0)116 223 1292    Mobile: +44 (0)785 298 8840
Fax:    +44 (0)116 252 3311    Email:  Tony.Linde@leicester.ac.uk
Post:   Department of Physics & Astronomy,
        University of Leicester, Leicester, UK   LE1 7RH
Website:    http://www.star.le.ac.uk/~ael
Calendar:   http://cal.tonylinde.com
            
Programme Manager, AstroGrid     http://www.astrogrid.org 
Project Manager, EuroVO VOTech   http://eurovotech.org 

From owner-semantics@eso.org  Wed Sep  6 15:22:48 2006
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Date: Wed,  6 Sep 2006 15:22:19 +0200
From: Andrea Preite Martinez <andrea.preitemartinez@iasf-roma.inaf.it>
To: semantics@ivoa.net
Subject: Opening discussion on WD1.2 (Revised list of words)
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Reply-To: Andrea Preite Martinez <andrea.preitemartinez@iasf-roma.inaf.it>

Dear All,

I'd like to open the discussion on the new version (WD v1.2 20060906)  
of the list of ucd-words (IVOA REC v1.11 20051231).
According to the procedure established for the maintenance of the  
list, a first period of discussion was allowed within the UCD-SciBoard  
(mid July - mid August). The proposed Requests For Modifications  
(RFMs) were published on the twiki page

http://www.ivoa.net/twiki/bin/viewauth/IVOA/UCDwordsRFM .

All proposals need to have an explicit answer (in particular if the  
RFM is not accepted). The answers were inserted after each RFM  
(globally for the global revision of the time-branch, in a separate TN  
at the end of the document).
On the basis of this, I revised the Recommendation Version 1.11 of 20051231

http://www.ivoa.net/Documents/latest/UCDlist.html ,

generating a Working Draft of V1.2 that you can find:
- at the end of the above mentioned twiki page
- in our WG page http://www.ivoa.net/twiki/bin/view/IVOA/IvoaSemantics
- in the IVOA Document repository (probably tomorrows)

The next steps will be:
- discussion of the WD 1.2 within the WG. I propose to keep it open at  
least till the end of September.
- re-editing of the WD, if/as necessary
- move the WD to PR and open a RFC period for the InterOp community  
(probably in October).
- propose to Exec Rec V1.2 of the list.

Andrea

P.S.: some members of the SciBoard asked for a "verification"  
tool/web-service, able to tell you which ucd to use in case of doubt.

I pass the request to the UCD-TechBoard, but I think we have already a  
sort of verification tool, called "builder", at
http://vizier.u-strasbg.fr/UCD/cgi-bin/descr2ucd ,
although it is far for being perfect (because I'm an amateur  
programmer!!) and sometimes even contradictory (ex.: a catalogue is  
associated to meta.dataset, while RecV1.11 says meta.table=table,  
catalogue!).

Other tools can be found at
http://vizier.u-strasbg.fr/w/doc/UCD/ .

===================================================================================
Andrea Preite Martinez                 andrea.preitemartinez@iasf-roma.inaf.it
IASF                                   Tel.IASF:+39.06.4993.4651
Via del Fosso del Cavaliere 100        Tel.CDS :+33.3.90242452
I-00133 Roma                           Cell.1  :+39.320.43.15.383
                                        Cell.2  :+39.
===================================================================================



From owner-semantics@eso.org  Sun Oct  1 17:54:13 2006
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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: "'VOTech-ResourceDiscovery'" <ds5@eurovotech.org>, <semantics@ivoa.net>
Subject: FW: [ESWC2007-Announce] ESWC 2007 Newsletter - October
Date: Sun, 1 Oct 2006 16:53:33 +0100
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This is a multi-part message in MIME format.

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 fyi...

-----Original Message-----
From: eswc2007-announce-bounces@lists.deri.org
[mailto:eswc2007-announce-bounces@lists.deri.org] On Behalf Of Stijn =
Heymans
Sent: 01 October 2006 14:01
To: eswc2007-announce@lists.deri.org
Subject: [ESWC2007-Announce] ESWC 2007 Newsletter - October

Dear=A0Semantic=A0Web=A0Colleagues:=A0

The=A04th=A0annual=A0European=A0Semantic=A0Web=A0Conference=A0is=A0happy=A0=
to=A0announce=A0the=A0lau
nch=A0of=A0the first=A0official=A0newsletter - see
attachment.=A0This=A0newsletter=A0will=A0cover=A0the=A0latest=A0informati=
on=A0regarding
this=A0leading=A0Semantic=A0Web=A0event.=A0

Best regards,
ESWC=A007=A0Publicity=A0Chair
Stijn=A0Heymans
stijn.heymans@deri.org




--
http://members.deri.at/~stijnh/contact.html

++
You will feel hungry again in another hour.

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	filename="First ESWC 2007 newsletter.pdf"

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------=_NextPart_000_002C_01C6E57A.21452BF0--

From owner-semantics@eso.org  Mon Oct 16 13:07:55 2006
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From: Norman Gray <norman@astro.gla.ac.uk>
Subject: Job opening, Semantic data models, UK
Date: Mon, 16 Oct 2006 12:07:15 +0100
To: semantics@ivoa.net
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Reply-To: Norman Gray <norman@astro.gla.ac.uk>


Folks,

This is a pre-announcement of a partly CompSci job in Glasgow, UK,  
which I'm associated with.  The post is mostly aimed at CS people  
with an interest in applications, but Astro developers with  
theoretical tendencies would be very welcome also!  I hope it isn't  
deemed an abuse of the list to post it here.

Norman





Initial applications are invited for two positions at the
Department of Computing Science of the University of Glasgow,
for the EPSRC funded project:

Explicator: Intelligent access to foreign data models

The Virtual Observatory (VO) project within astronomy has two
core problems: how to find data from scattered, and often
under-resourced, archives, and once it is found how to make
use of it, given that different archives will generally have
significantly different models of how their data is
structured.  The High-Energy Physics (HEP) community doesn't
really have the first problem -- there are rather fewer
important accelerators and detectors, and so fewer data
sources -- but does have the second, since different
facilities have different, and necessarily inflexible, ideas
about how to structure the data they produce.

An obvious approach is to define a consensus model, but
this can fall victim to the usual social problems of
standardisation.  This project will explore a radically different
peer-to-peer approach, making it possible for software to
extract the information it needs from a network of
explanations.  This approach recognises that partial and
indirect understanding of a dataset's structure can, in
important cases, be enough for the software to do its work.

This approach builds on both well-established Artificial
Intelligence (AI) and Knowledge Engineering (KE) work, as
well as on the emerging technologies from the Semantic Web
community.  It separately builds on work from the Information
Retrieval (IR) community on how to work with distributed,
heterogeneous and uncertain data. The work will extend the
successful TERRIER information retrieval platform
(http://ir.dcs.gla.ac.uk/terrier) and its corresponding
tools, developed at the University of Glasgow, with semantic
web tools and techniques.

This project is a collaboration between the Information
Retrieval group in Glasgow's department of Computing Science,
the X-Ray and Observational Astronomy group within
Leicester's department of Physics and Astronomy, and the
Experimental Particle Physics group in Glasgow's department
of Physics and Astronomy.

Applicants should have a good first degree in Computer
Science or Physical Science, and preferably a PhD and
research experience in fields related to the project topic
such as Artificial Intelligence, Information Extraction,
Information Retrieval, Semantic Web/Mapping/Technologies or
related subjects.

Informal enquiries to:
Dr Iadh Ounis (CS, Glasgow)
     tel: +44 (0)141 330 5652 or ounis@dcs.gla.ac.uk,
Dr Norman Gray (P&A, Leicester)
     norman@astro.gla.ac.uk
Dr Paul Millar (GriddPP and Glasgow)
     p.millar@physics.gla.ac.uk

Starting date: early January 2007 or soon thereafter.

Salary details are to be confirmed, but we anticipate employing
successful candidates on grade 7 of the University's salary scales:
Ł25,633 -Ł34,488 per annum






-- 
------------------------------------------------------------------------ 
----
Norman Gray  /  http://nxg.me.uk
eurovotech.org  /  University of Leicester, UK




From owner-semantics@eso.org  Tue Oct 31 15:02:16 2006
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Date: Tue, 31 Oct 2006 15:01:19 +0100
From: Andrea Preite Martinez <andrea.preitemartinez@iasf-roma.inaf.it>
To: semantics@ivoa.net
Subject: TN on Ontology
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Reply-To: Andrea Preite Martinez <andrea.preitemartinez@iasf-roma.inaf.it>

I'm glad to announce that a Technical Note

"Ontology of Astronomical Object Types" V0.1

is now available on the twiki page of the Semantics WG, together with  
the complete
Javadoc documentation (formats .zip or tar.gz) of the draft ontology.
Comments and contributions are warmly welcome.

It is worth noting that the ontology is made of "defined" concepts,  
and only a fraction
of them has been defined, for the moment only in terms of components  
and/or morphology
and/or processes.
Nothing yet has been done in terms of observational properties. Work  
is in progress.

I then ask for the contribution of the members of the WG and of the  
scientific community
to help finding the necessary and/or sufficient conditions to define  
the concepts (what
is needed is a complete but concise description in plain text of the  
concepts in terms of
components and/or morphology and/or physical processes and/or  
observational properties
and/or ..).

Andrea

P.S.: the end of RFC period for the PR UCDlist version 1.2 is approaching!



===================================================================================
Andrea Preite Martinez                 andrea.preitemartinez@iasf-roma.inaf.it
IASF                                   Tel.IASF:+39.06.4993.4641
Via del Fosso del Cavaliere 100        Tel.CDS :+33.3.90242452
I-00133 Roma                           Cell.1  :+39.320.43.15.383
                                        Cell.2  :+39.
===================================================================================



From owner-semantics@eso.org  Tue Oct 31 15:46:28 2006
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Message-ID: <45476199.8080200@mondeca.com>
Date: Tue, 31 Oct 2006 15:45:45 +0100
From: Bernard Vatant <bernard.vatant@mondeca.com>
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To: Andrea Preite Martinez <andrea.preitemartinez@iasf-roma.inaf.it>
Cc: semantics@ivoa.net
Subject: Re: TN on Ontology
References: <20061031150119.4bj6hoh74gc8ck4s@webmail.sic.rm.cnr.it>
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Reply-To: Bernard Vatant <bernard.vatant@mondeca.com>

Hello Andrea

This looks like very interesting work.

One remark : OWLDoc is fine, but cannot be imported back in an ontology 
editor (e.g. Protégé or SWOOP).
Would it be possible for you to publish also the RDF file, which does 
not seem to be currently available from the Wiki?

Thanks

Bernard

Andrea Preite Martinez a écrit :
> I'm glad to announce that a Technical Note
>
> "Ontology of Astronomical Object Types" V0.1
>
> is now available on the twiki page of the Semantics WG, together with 
> the complete
> Javadoc documentation (formats .zip or tar.gz) of the draft ontology.
> Comments and contributions are warmly welcome.

-- 

*Bernard Vatant
*Knowledge Engineering
----------------------------------------------------
*Mondeca**
*3, cité Nollez 75018 Paris France
Web:    www.mondeca.com <http://www.mondeca.com>
----------------------------------------------------
Tel:       +33 (0) 871 488 459
Mail:     bernard.vatant@mondeca.com <mailto:bernard.vatant@mondeca.com>
Blog:    Leçons de Choses <http://mondeca.wordpress.com/>

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Cc: semantics@ivoa.net
From: Rob Seaman <seaman@noao.edu>
Subject: Re: TN on Ontology
Date: Tue, 31 Oct 2006 12:08:45 -0700
To: Andrea Preite Martinez <andrea.preitemartinez@iasf-roma.inaf.it>
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Reply-To: Rob Seaman <seaman@noao.edu>

On Oct 31, 2006, at 7:01 AM, Andrea Preite Martinez wrote:

> I'm glad to announce that a Technical Note
>
> "Ontology of Astronomical Object Types" V0.1

The document is labeled v1.0.

> It is worth noting that the ontology is made of "defined" concepts,  
> and only a fraction
> of them has been defined, for the moment only in terms of  
> components and/or morphology
> and/or processes.

I see you've avoided recent controversy by not defining the word  
"planet" :)

Rob
seaman@noao.edu


From owner-semantics@eso.org  Thu Nov  2 15:58:33 2006
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Date: Thu, 02 Nov 2006 11:01:15 +0100
From: Alexandre RICHARD <richard@newb6.u-strasbg.fr>
To: Rob Seaman <seaman@noao.edu>
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Quoting Rob Seaman <seaman@noao.edu>:

 > On Oct 31, 2006, at 7:01 AM, Andrea Preite Martinez wrote:
 >
 >> I'm glad to announce that a Technical Note
 >>
 >> "Ontology of Astronomical Object Types" V0.1
 >
 > The document is labeled v1.0.

My bad, it's a typo from when I adapted the IVAO technical note
document model to the actual document.

Alexandre

-- 
     _______
    /  ~   /, Alexandre RICHARD     mailto:richard@astro.u-strasbg.fr
   / ~~~~ //  Observatoire de Strasbourg    Phone +33 (0) 390 242 477
  /______//   11, rue de l'universite     Telefax +33 (0) 390 242 417
(______(/    F-67000 Strasbourg  France

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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
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See attached for announcements about ESWC2007.

T.

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Subject: [ESWC2007-Announce] call for extended abstracts - PhD symposium atESWC 2007
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[Apologies if you receive multiple copies]

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
         CALL FOR EXTENDED ABSTRACTS

			KWEPSY2007
		KnowledgeWeb PhD Symposium
		     Innsbruck, Austria
		      6th June, 2006
	     http://ontoworld.org/wiki/KWEPSY2007

    at the 4th Annual European Semantic Web Conference (ESWC)
		   http://www.eswc2007.org/
			 =20
Executive Summary
------------------------------------------------------------------
The Knowledge Web PhD Symposium aims at bringing together doctoral =
students within the Semantic Web community to open their work up to =
discussion in a European forum, and to obtain valuable feedback from =
leading scientists in the field. However, in contrast with other similar =
initiatives, participants to the symposium will not only receive =
constructive comments with respect to topic-specific research issues; =
they will also be assisted in formulating a coherent research narrative =
for their doctoral work. In particular, students will be asked to submit =
an extended abstract, structured in accordance to a pre-defined =
template, which has been designed to highlight the key methodological =
components required for a sound research narrative. Generally speaking, =
priority will be given to 1st/2nd year PhD students (because they are =
still in the process of defining the scope of their research). However, =
all PhD students are welcome and encouraged to apply.=20

Just as in 2006 (http://www.l3s.de/kweb/kwepsy2006/), the 2nd Symposium =
will be co-located with the 4th Annual European Semantic Web Conference =
ESWC2007. It is scheduled for the 6th of June 2007.=20

Important Dates (GMT)
------------------------------------------------------------------
-- Deadline for paper submissions: March 2, 2007=20
-- Notification of acceptance: April 2, 2007=20
-- Camera-ready versions: April 13, 2007=20
-- Symposium: June 6, 2007=20

Call for Contributions
------------------------------------------------------------------
Though organized under the umbrella of KnowledgeWeb =
(http://knowledgeweb.semanticweb.org/), the symposium is open to all PhD =
students carrying out research on topics related to the Semantic Web. =
The applicants are required to send an extended abstract of their =
doctoral work, which should address the following aspects:=20

-- Describe the research problem of the PhD thesis and argument its =
relevance for the Semantic Web area.=20
-- Describe the state of the art, emphasizing the need for improvement =
and the feasibility of their approach.=20
-- Summarize the expected contributions and outline the real-world use =
cases (applications, target audience) which will mainly benefit from =
their work.=20
-- Sketch the research methodology that they have adopted (or are =
planning to adopt), in particular the approach to evaluating/validating =
the results.=20
-- Describe the proposed approach, clearly differentiating between the =
results achieved so far, the remaining work and the (planned) =
evaluation.=20
-- Compare and contrast their approach with other existing approaches, =
in particular highlighting the shortcomings of other approaches and the =
way they are dealt with in the present work.=20
-- Conclude with a summary and an outline of the planned future work.=20

Papers should not exceed 5 pages. They should be formatted according to =
the LNCS format =
(http://www.springer.com/east/home/computer/lncs?SGWID=3D5-164-7-72376-0)=
 and submitted as PDF documents per mail to Elena Simperl simperl at =
inf.fu-berlin.de. Applicants should also specify how long they have =
worked on their doctoral work.=20

All papers will be peer-reviewed by at least two members of the =
scientific advisory board. The submissions will be reviewed against the =
following criteria (in this order):=20

-- Conformance of the submitted abstract to the given template.=20
-- Novelty and originality of the research work.
-- Rigorousness and scientific soundness of the overall approach and of =
the results so far.=20
-- Clarity of the presentation.=20
-- Relevance of the work with respect to the Semantic Web field.=20

The selected participants will be given the opportunity to open their =
work up to discussion in front of other students and an expert audience =
(either in a regular presentation session or in a poster session, this =
will be decided by the reviewers). Each accepted contribution will be =
assigned to a scientific advisor, who will provide extended feedback to =
the presented research achievements and to the accuracy of the applied =
methodology, and will attend the symposium. A template for structuring =
the paper presentations will be provided after the final program of the =
symposium has been set up.=20

Topics
------------------------------------------------------------------
Topics of interest to the symposium include (but are not restricted to): =


-- Ontology management (e.g. creation, evolution, evaluation)=20
-- Ontology alignment (e.g. mapping, matching, merging, alignment, =
mediation and reconciliation)=20
-- Ontology learning=20
-- Ontology population=20
-- Business-oriented aspects of ontology engineering (costs, business =
measurements, cost benefit analysis)=20
-- Semantic Web-based multimedia=20
-- Semantic annotation of data=20
-- Semantic Web trust, privacy, security and intellectual property =
rights=20
-- Semantic Web representation and query languages=20
-- Reasoning on the Web (e.g. scalability, fuzziness, distribution)=20
-- Searching, querying, visualizing, navigating and browsing the =
Semantic Web=20
-- Personalization and user modelling=20
-- User interfaces and Semantic Web=20
-- Semantic Grid and Middleware=20
-- Semantic Web Services (e.g. description, discovery, invocation, =
composition)=20
-- Semantic Web Applications for knowledge management, eBusiness, =
eCulture, eGovernment, eHealth, eLearning, eScience etc.=20
-- Database technologies for the Semantic Web=20
-- Semantic interoperability=20
-- Semantic data integration=20
-- Semantic Web mining=20

Organisation Committee
-------------------------------------------------------------------
Elena Simperl (Free University of Berlin, Germany)
Joerg Diederich (L3S Hannover, Germany)
Guus Schreiber (Vrije Universiteit Amsterdam, Netherlands)


Scientific Advisors (provisional list)
-------------------------------------------------------------------
Alain Leger (France Telecom, France)
Anupriya Ankolekar (University of Karlsruhe, Germany)
Axel Polleres (DERI Innsbruck, Austria)
Carole Goble (University of Manchester, UK)
Daniel Olmedilla (University of Hannover, Germany)
Diana Maynard (University of Sheffield, UK)
Dieter Fensel (DERI Innsbruck, Austria)
Elena Simperl (Free University of Berlin, Germany)
Enrico Franconi (Free University of Bozen-Bolzano, Italy)
Enrico Motta (The Open University, UK)=20
Fabien Gandon (INRIA Sophia-Antipolis, France)
Fausto Giunchiglia (University of Trento, Italy)
Frank van Harmelen (Vrije Universiteit Amsterdam, Netherlands)
Guus Schreiber (Vrije Universiteit Amsterdam, Netherlands)
Heiner Stuckenschmidt (University of Mannheim, Germany)
Holger Wache (Vrije Universiteit Amsterdam, Netherlands)
Ilya Zaihrayeu (University of Trento, Italy)
Jeff Z. Pan (University of Aberdeen, UK)
Jerome Euzenat (INRIA Rhone-Alpes, France)
Joerg Diederich (University of Hannover, Germany)
John Breslin (NUIG Galway, Irland)
John Davies (BT, UK)
Lora Aroyo (Technical University of Eindhoven, Netherlands)
Lyndon Nixon (Free University of Berlin, Germany)
Marco Ronchetti (University of Trento, Italy)
Martin Dzbor (The Open University, UK)
Michal Zaremba (DERI Innsbruck, Austria)
Pavel Shvaiko (University of Trento, Italy)
Peter Haase (University of Karlsruhe, Germany)
Richard Benjamins (iSOCO, Spain)
Robert Meersman (Free University of Brussels, Belgium)
Robert Shearer (University of Manchester, UK)
Robert Tolksdorf (Free University of Berlin, Germany)
Rose Dieng (INRIA, France)
Rudi Studer (University of Karlsruhe, Germany)
Sergio Tesaris (Free University of Bozen-Bolzano, Italy)
Stefan Decker (NUIG Galway, Irland)
Steven Willmott (UPC, Spain)
Tomas Vitvar (NUIG Galway, Irland)
Valentina Tamma (University of Liverpool, UK)
Walter Binder (L'Ecole Polytechnique Fdrale de Lausanne, CH)
Wolfgang Nejdl (University of Hannover, Germany)
Yiannis Kompatsiaris (CERTH, Greece)
Ying Ding (DERI Innsbruck, Austria)
York Sure (University of Karlsruhe, Germany)

Contact
----------------------------------------------------------------------
Please contact Elena Simperl (simperl at inf.fu-berlin.de) if you have =
any questions regarding this event.=20


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<TITLE>[ESWC2007-Announce] call for extended abstracts - PhD symposium =
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<P><FONT SIZE=3D2>[Apologies if you receive multiple copies]</FONT>
</P>

<P><FONT =
SIZE=3D2>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CALL =
FOR EXTENDED ABSTRACTS</FONT>
</P>

<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT =
SIZE=3D2>KWEPSY2007</FONT>

<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT SIZE=3D2>KnowledgeWeb =
PhD Symposium</FONT>

<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT =
SIZE=3D2>&nbsp;&nbsp;&nbsp;&nbsp; Innsbruck, Austria</FONT>

<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT =
SIZE=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 6th June, 2006</FONT>

<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT =
SIZE=3D2>&nbsp;&nbsp;&nbsp;&nbsp; <A =
HREF=3D"http://ontoworld.org/wiki/KWEPSY2007">http://ontoworld.org/wiki/K=
WEPSY2007</A></FONT>
</P>

<P><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; at the 4th Annual European Semantic =
Web Conference (ESWC)</FONT>

<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT SIZE=3D2>&nbsp;&nbsp; =
<A HREF=3D"http://www.eswc2007.org/">http://www.eswc2007.org/</A></FONT>

<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT SIZE=3D2>&nbsp; </FONT>

<BR><FONT SIZE=3D2>Executive Summary</FONT>

<BR><FONT =
SIZE=3D2>----------------------------------------------------------------=
--</FONT>

<BR><FONT SIZE=3D2>The Knowledge Web PhD Symposium aims at bringing =
together doctoral students within the Semantic Web community to open =
their work up to discussion in a European forum, and to obtain valuable =
feedback from leading scientists in the field. However, in contrast with =
other similar initiatives, participants to the symposium will not only =
receive constructive comments with respect to topic-specific research =
issues; they will also be assisted in formulating a coherent research =
narrative for their doctoral work. In particular, students will be asked =
to submit an extended abstract, structured in accordance to a =
pre-defined template, which has been designed to highlight the key =
methodological components required for a sound research narrative. =
Generally speaking, priority will be given to 1st/2nd year PhD students =
(because they are still in the process of defining the scope of their =
research). However, all PhD students are welcome and encouraged to =
apply. </FONT></P>

<P><FONT SIZE=3D2>Just as in 2006 (<A =
HREF=3D"http://www.l3s.de/kweb/kwepsy2006/">http://www.l3s.de/kweb/kwepsy=
2006/</A>), the 2nd Symposium will be co-located with the 4th Annual =
European Semantic Web Conference ESWC2007. It is scheduled for the 6th =
of June 2007. </FONT></P>

<P><FONT SIZE=3D2>Important Dates (GMT)</FONT>

<BR><FONT =
SIZE=3D2>----------------------------------------------------------------=
--</FONT>

<BR><FONT SIZE=3D2>-- Deadline for paper submissions: March 2, 2007 =
</FONT>

<BR><FONT SIZE=3D2>-- Notification of acceptance: April 2, 2007 </FONT>

<BR><FONT SIZE=3D2>-- Camera-ready versions: April 13, 2007 </FONT>

<BR><FONT SIZE=3D2>-- Symposium: June 6, 2007 </FONT>
</P>

<P><FONT SIZE=3D2>Call for Contributions</FONT>

<BR><FONT =
SIZE=3D2>----------------------------------------------------------------=
--</FONT>

<BR><FONT SIZE=3D2>Though organized under the umbrella of KnowledgeWeb =
(<A =
HREF=3D"http://knowledgeweb.semanticweb.org/">http://knowledgeweb.semanti=
cweb.org/</A>), the symposium is open to all PhD students carrying out =
research on topics related to the Semantic Web. The applicants are =
required to send an extended abstract of their doctoral work, which =
should address the following aspects: </FONT></P>

<P><FONT SIZE=3D2>-- Describe the research problem of the PhD thesis and =
argument its relevance for the Semantic Web area. </FONT>

<BR><FONT SIZE=3D2>-- Describe the state of the art, emphasizing the =
need for improvement and the feasibility of their approach. </FONT>

<BR><FONT SIZE=3D2>-- Summarize the expected contributions and outline =
the real-world use cases (applications, target audience) which will =
mainly benefit from their work. </FONT></P>

<P><FONT SIZE=3D2>-- Sketch the research methodology that they have =
adopted (or are planning to adopt), in particular the approach to =
evaluating/validating the results. </FONT></P>

<P><FONT SIZE=3D2>-- Describe the proposed approach, clearly =
differentiating between the results achieved so far, the remaining work =
and the (planned) evaluation. </FONT></P>

<P><FONT SIZE=3D2>-- Compare and contrast their approach with other =
existing approaches, in particular highlighting the shortcomings of =
other approaches and the way they are dealt with in the present work. =
</FONT></P>

<P><FONT SIZE=3D2>-- Conclude with a summary and an outline of the =
planned future work. </FONT>
</P>

<P><FONT SIZE=3D2>Papers should not exceed 5 pages. They should be =
formatted according to the LNCS format (<A =
HREF=3D"http://www.springer.com/east/home/computer/lncs?SGWID=3D5-164-7-7=
2376-0">http://www.springer.com/east/home/computer/lncs?SGWID=3D5-164-7-7=
2376-0</A>) and submitted as PDF documents per mail to Elena Simperl =
simperl at inf.fu-berlin.de. Applicants should also specify how long =
they have worked on their doctoral work. </FONT></P>

<P><FONT SIZE=3D2>All papers will be peer-reviewed by at least two =
members of the scientific advisory board. The submissions will be =
reviewed against the following criteria (in this order): </FONT></P>

<P><FONT SIZE=3D2>-- Conformance of the submitted abstract to the given =
template. </FONT>

<BR><FONT SIZE=3D2>-- Novelty and originality of the research =
work.</FONT>

<BR><FONT SIZE=3D2>-- Rigorousness and scientific soundness of the =
overall approach and of the results so far. </FONT>

<BR><FONT SIZE=3D2>-- Clarity of the presentation. </FONT>

<BR><FONT SIZE=3D2>-- Relevance of the work with respect to the Semantic =
Web field. </FONT>
</P>

<P><FONT SIZE=3D2>The selected participants will be given the =
opportunity to open their work up to discussion in front of other =
students and an expert audience (either in a regular presentation =
session or in a poster session, this will be decided by the reviewers). =
Each accepted contribution will be assigned to a scientific advisor, who =
will provide extended feedback to the presented research achievements =
and to the accuracy of the applied methodology, and will attend the =
symposium. A template for structuring the paper presentations will be =
provided after the final program of the symposium has been set up. =
</FONT></P>

<P><FONT SIZE=3D2>Topics</FONT>

<BR><FONT =
SIZE=3D2>----------------------------------------------------------------=
--</FONT>

<BR><FONT SIZE=3D2>Topics of interest to the symposium include (but are =
not restricted to): </FONT>
</P>

<P><FONT SIZE=3D2>-- Ontology management (e.g. creation, evolution, =
evaluation) </FONT>

<BR><FONT SIZE=3D2>-- Ontology alignment (e.g. mapping, matching, =
merging, alignment, mediation and reconciliation) </FONT>

<BR><FONT SIZE=3D2>-- Ontology learning </FONT>

<BR><FONT SIZE=3D2>-- Ontology population </FONT>

<BR><FONT SIZE=3D2>-- Business-oriented aspects of ontology engineering =
(costs, business measurements, cost benefit analysis) </FONT>

<BR><FONT SIZE=3D2>-- Semantic Web-based multimedia </FONT>

<BR><FONT SIZE=3D2>-- Semantic annotation of data </FONT>

<BR><FONT SIZE=3D2>-- Semantic Web trust, privacy, security and =
intellectual property rights </FONT>

<BR><FONT SIZE=3D2>-- Semantic Web representation and query languages =
</FONT>

<BR><FONT SIZE=3D2>-- Reasoning on the Web (e.g. scalability, fuzziness, =
distribution) </FONT>

<BR><FONT SIZE=3D2>-- Searching, querying, visualizing, navigating and =
browsing the Semantic Web </FONT>

<BR><FONT SIZE=3D2>-- Personalization and user modelling </FONT>

<BR><FONT SIZE=3D2>-- User interfaces and Semantic Web </FONT>

<BR><FONT SIZE=3D2>-- Semantic Grid and Middleware </FONT>

<BR><FONT SIZE=3D2>-- Semantic Web Services (e.g. description, =
discovery, invocation, composition) </FONT>

<BR><FONT SIZE=3D2>-- Semantic Web Applications for knowledge =
management, eBusiness, eCulture, eGovernment, eHealth, eLearning, =
eScience etc. </FONT></P>

<P><FONT SIZE=3D2>-- Database technologies for the Semantic Web </FONT>

<BR><FONT SIZE=3D2>-- Semantic interoperability </FONT>

<BR><FONT SIZE=3D2>-- Semantic data integration </FONT>

<BR><FONT SIZE=3D2>-- Semantic Web mining </FONT>
</P>

<P><FONT SIZE=3D2>Organisation Committee</FONT>

<BR><FONT =
SIZE=3D2>----------------------------------------------------------------=
---</FONT>

<BR><FONT SIZE=3D2>Elena Simperl (Free University of Berlin, =
Germany)</FONT>

<BR><FONT SIZE=3D2>Joerg Diederich (L3S Hannover, Germany)</FONT>

<BR><FONT SIZE=3D2>Guus Schreiber (Vrije Universiteit Amsterdam, =
Netherlands)</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>Scientific Advisors (provisional list)</FONT>

<BR><FONT =
SIZE=3D2>----------------------------------------------------------------=
---</FONT>

<BR><FONT SIZE=3D2>Alain Leger (France Telecom, France)</FONT>

<BR><FONT SIZE=3D2>Anupriya Ankolekar (University of Karlsruhe, =
Germany)</FONT>

<BR><FONT SIZE=3D2>Axel Polleres (DERI Innsbruck, Austria)</FONT>

<BR><FONT SIZE=3D2>Carole Goble (University of Manchester, UK)</FONT>

<BR><FONT SIZE=3D2>Daniel Olmedilla (University of Hannover, =
Germany)</FONT>

<BR><FONT SIZE=3D2>Diana Maynard (University of Sheffield, UK)</FONT>

<BR><FONT SIZE=3D2>Dieter Fensel (DERI Innsbruck, Austria)</FONT>

<BR><FONT SIZE=3D2>Elena Simperl (Free University of Berlin, =
Germany)</FONT>

<BR><FONT SIZE=3D2>Enrico Franconi (Free University of Bozen-Bolzano, =
Italy)</FONT>

<BR><FONT SIZE=3D2>Enrico Motta (The Open University, UK) </FONT>

<BR><FONT SIZE=3D2>Fabien Gandon (INRIA Sophia-Antipolis, France)</FONT>

<BR><FONT SIZE=3D2>Fausto Giunchiglia (University of Trento, =
Italy)</FONT>

<BR><FONT SIZE=3D2>Frank van Harmelen (Vrije Universiteit Amsterdam, =
Netherlands)</FONT>

<BR><FONT SIZE=3D2>Guus Schreiber (Vrije Universiteit Amsterdam, =
Netherlands)</FONT>

<BR><FONT SIZE=3D2>Heiner Stuckenschmidt (University of Mannheim, =
Germany)</FONT>

<BR><FONT SIZE=3D2>Holger Wache (Vrije Universiteit Amsterdam, =
Netherlands)</FONT>

<BR><FONT SIZE=3D2>Ilya Zaihrayeu (University of Trento, Italy)</FONT>

<BR><FONT SIZE=3D2>Jeff Z. Pan (University of Aberdeen, UK)</FONT>

<BR><FONT SIZE=3D2>Jerome Euzenat (INRIA Rhone-Alpes, France)</FONT>

<BR><FONT SIZE=3D2>Joerg Diederich (University of Hannover, =
Germany)</FONT>

<BR><FONT SIZE=3D2>John Breslin (NUIG Galway, Irland)</FONT>

<BR><FONT SIZE=3D2>John Davies (BT, UK)</FONT>

<BR><FONT SIZE=3D2>Lora Aroyo (Technical University of Eindhoven, =
Netherlands)</FONT>

<BR><FONT SIZE=3D2>Lyndon Nixon (Free University of Berlin, =
Germany)</FONT>

<BR><FONT SIZE=3D2>Marco Ronchetti (University of Trento, Italy)</FONT>

<BR><FONT SIZE=3D2>Martin Dzbor (The Open University, UK)</FONT>

<BR><FONT SIZE=3D2>Michal Zaremba (DERI Innsbruck, Austria)</FONT>

<BR><FONT SIZE=3D2>Pavel Shvaiko (University of Trento, Italy)</FONT>

<BR><FONT SIZE=3D2>Peter Haase (University of Karlsruhe, Germany)</FONT>

<BR><FONT SIZE=3D2>Richard Benjamins (iSOCO, Spain)</FONT>

<BR><FONT SIZE=3D2>Robert Meersman (Free University of Brussels, =
Belgium)</FONT>

<BR><FONT SIZE=3D2>Robert Shearer (University of Manchester, UK)</FONT>

<BR><FONT SIZE=3D2>Robert Tolksdorf (Free University of Berlin, =
Germany)</FONT>

<BR><FONT SIZE=3D2>Rose Dieng (INRIA, France)</FONT>

<BR><FONT SIZE=3D2>Rudi Studer (University of Karlsruhe, Germany)</FONT>

<BR><FONT SIZE=3D2>Sergio Tesaris (Free University of Bozen-Bolzano, =
Italy)</FONT>

<BR><FONT SIZE=3D2>Stefan Decker (NUIG Galway, Irland)</FONT>

<BR><FONT SIZE=3D2>Steven Willmott (UPC, Spain)</FONT>

<BR><FONT SIZE=3D2>Tomas Vitvar (NUIG Galway, Irland)</FONT>

<BR><FONT SIZE=3D2>Valentina Tamma (University of Liverpool, UK)</FONT>

<BR><FONT SIZE=3D2>Walter Binder (L'Ecole Polytechnique Fdrale de =
Lausanne, CH)</FONT>

<BR><FONT SIZE=3D2>Wolfgang Nejdl (University of Hannover, =
Germany)</FONT>

<BR><FONT SIZE=3D2>Yiannis Kompatsiaris (CERTH, Greece)</FONT>

<BR><FONT SIZE=3D2>Ying Ding (DERI Innsbruck, Austria)</FONT>

<BR><FONT SIZE=3D2>York Sure (University of Karlsruhe, Germany)</FONT>
</P>

<P><FONT SIZE=3D2>Contact</FONT>

<BR><FONT =
SIZE=3D2>----------------------------------------------------------------=
------</FONT>

<BR><FONT SIZE=3D2>Please contact Elena Simperl (simperl at =
inf.fu-berlin.de) if you have any questions regarding this event. =
</FONT>
</P>

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_______________________________________________
ESWC2007-Announce mailing list
ESWC2007-Announce@lists.deri.org
http://lists.deri.org/mailman/listinfo/eswc2007-announce

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Subject: [ESWC2007-Announce] Call for tutorials at ESWC 2007
Date: Fri, 3 Nov 2006 19:18:00 -0000
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[Apologies if you receive multiple copies]

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
	CALL FOR TUTORIALS

	4th European Semantic Web Conference (ESWC 2007)
	3-7 June 2007
	Innsbruck, Austria

DESCRIPTION The vision of the Semantic Web is to enhance today=E2=80=99s =
web via the
exploitation of machine-processable meta data. The explicit =
representation of
the semantics of data, enriched with domain theories (Ontologies), will =
enable
a web that provides a qualitatively new level of service. It will weave
together a large network of human knowledge and makes this knowledge
machine-processable. Various automated services will help the users to =
achieve
their goals by accessing and processing information in =
machine-understandable
form. This network of knowledge systems will ultimately lead to truly
intelligent systems, which will be employed for various specialized =
reasoning
subsystems to accomplish complex tasks. Many technologies and =
methodologies are
being developed within Artificial Intelligence, Natural Language =
Processing,
Machine Learning, Databases, Multimedia Systems, Distributed Systems, =
Software
Engineering and Information Systems that can contribute towards the =
realization
of this vision.

The 4th Annual European Semantic Web Conference (ESWC 2007) will present =
the
latest results in research and application of Semantic Web technologies,
including knowledge mark-up languages, Semantic Web services, and =
ontology
management. More details can be found on the ESWC 2007 homepage.

In addition to the regular research and workshop programme, ESWC 2007 =
invites
tutorials on relevant topics of interest. A tutorial should present the =
state
of the art of a semantic web area enabling attendees to fully appreciate =
the
current issues, main schools of thought and possible application areas.
Proposals for tutorials are welcome for the ESWC 2007 topics of interest =
(see
bottom); tutorial proposals are requested to follow the submission =
process
defined below.

TUTORIAL PROPOSALS


ESWC 2007 tutorials may be either for a full day or for a half day. =
Unless
there is a clear rationale we will give preference to half day tutorials =
over
full day tutorials.

Tutorials proposed for the ESWC 2007 should cover one topic in =
appropriate
depth (see ESWC 2007 topics below), and present this in a appropriate =
manner
which enables attendees to fully comprehend and apply emerging Semantic =
Web
technologies. Although tutorials may focus entirely on theoretical =
aspects, we
strongly encourage hands-on sessions where appropriate.

Tutorial proposals should not exceed 5 pages in DIN A4 format and should
contain the following information:

    * abstract (200 words maximum; to be published on the ESWC 2007 =
website)
    * tutorial description (aims, content, presentation style, technical =
requirements)
    * relevance of the tutorial to ESWC 2007
    * outline of the tutorial content and schedule
    * information on presenters (name, affiliation, expertise, =
experiences in teaching and in tutorial presentation)

Tutorial proposals are to be submitted to Joerg Diederich, email: =
diederich at l3s dot de www: http://www.l3s.de/~diederich

Submitted proposals that follow the above guidelines will be reviewed by =
the
ESWC 2007 organizing committee with respect to the relevance of the =
topic, the
content, and the presentation style.

Important Dates:

    * submission deadline for tutorial proposals: 19 December 2006
    * notification of acceptance: 18 January 2007
    * tutorial hand-outs due: 31 March 2007
    * tutorial presentation date: 3 June 2007

For accepted tutorials, the presenters will need to submit the material =
for
hand-outs (the slide sets and / or additional information; software
installation and usage guides for practical hands-on sessions) to the
organization committee for preprinting and placement on the ESWC 2007 =
website.

For each accepted tutorial, we offer one discount of 180 EUR on the
registration fee for ESWC 2007 (50% of the Early-Bird registration fee).

TOPIC LIST The topics of interest for tutorials include, but are not =
limited to
the following:

    * Ontology Management (creation, evolution, evaluation, etc.)
    * Ontology Alignment (mapping, matching, merging, mediation and =
reconciliation)
    * Ontology Learning and Metadata Generation (e.g. HLT and ML =
approaches)
    * Multimedia and Semantic Web
    * Semantic Annotation of Data
    * Semantic Web Trust, Privacy, Security and Intellectual Property =
Rights
    * Semantic Web Rules and Query Languages
    * Logics for the Semantic Web
    * Reasoning on the Semantic Web
    * Behavior in the Semantic Web
    * Searching, Querying, Visualizing, Navigating and Browsing the =
Semantic Web
    * Personalization and User Modelling
    * User Interfaces and Semantic Web
    * Semantic Grid and Middleware
    * Semantic Web Services (description, discovery, invocation, =
composition, choreography, etc.)
    * Semantic Web-based Knowledge Management (e.g. Semantic Desktop, =
Knowledge Portals)
    * Semantic Web for e-Business, e-Culture, e-Government, e-Health, =
e-Learning, e-Science
    * Database Technologies for the Semantic Web
    * Data Semantics and Web Semantics
    * Semantic Interoperability
    * Semantic Workflows
    * Semantic Web Mining

TUTORIAL CHAIR Joerg Diederich (L3S Research Center), diederich at l3s =
dot de, http://www.l3s.de/~diederich


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<TITLE>[ESWC2007-Announce] Call for tutorials at ESWC 2007</TITLE>
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<!-- Converted from text/plain format -->

<P><FONT SIZE=3D2>[Apologies if you receive multiple copies]</FONT>
</P>

<P><FONT =
SIZE=3D2>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</FONT>

<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT SIZE=3D2>CALL FOR =
TUTORIALS</FONT>
</P>

<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT SIZE=3D2>4th =
European Semantic Web Conference (ESWC 2007)</FONT>

<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT SIZE=3D2>3-7 June =
2007</FONT>

<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT SIZE=3D2>Innsbruck, =
Austria</FONT>
</P>

<P><FONT SIZE=3D2>DESCRIPTION The vision of the Semantic Web is to =
enhance today=E2=80=99s web via the</FONT>

<BR><FONT SIZE=3D2>exploitation of machine-processable meta data. The =
explicit representation of</FONT>

<BR><FONT SIZE=3D2>the semantics of data, enriched with domain theories =
(Ontologies), will enable</FONT>

<BR><FONT SIZE=3D2>a web that provides a qualitatively new level of =
service. It will weave</FONT>

<BR><FONT SIZE=3D2>together a large network of human knowledge and makes =
this knowledge</FONT>

<BR><FONT SIZE=3D2>machine-processable. Various automated services will =
help the users to achieve</FONT>

<BR><FONT SIZE=3D2>their goals by accessing and processing information =
in machine-understandable</FONT>

<BR><FONT SIZE=3D2>form. This network of knowledge systems will =
ultimately lead to truly</FONT>

<BR><FONT SIZE=3D2>intelligent systems, which will be employed for =
various specialized reasoning</FONT>

<BR><FONT SIZE=3D2>subsystems to accomplish complex tasks. Many =
technologies and methodologies are</FONT>

<BR><FONT SIZE=3D2>being developed within Artificial Intelligence, =
Natural Language Processing,</FONT>

<BR><FONT SIZE=3D2>Machine Learning, Databases, Multimedia Systems, =
Distributed Systems, Software</FONT>

<BR><FONT SIZE=3D2>Engineering and Information Systems that can =
contribute towards the realization</FONT>

<BR><FONT SIZE=3D2>of this vision.</FONT>
</P>

<P><FONT SIZE=3D2>The 4th Annual European Semantic Web Conference (ESWC =
2007) will present the</FONT>

<BR><FONT SIZE=3D2>latest results in research and application of =
Semantic Web technologies,</FONT>

<BR><FONT SIZE=3D2>including knowledge mark-up languages, Semantic Web =
services, and ontology</FONT>

<BR><FONT SIZE=3D2>management. More details can be found on the ESWC =
2007 homepage.</FONT>
</P>

<P><FONT SIZE=3D2>In addition to the regular research and workshop =
programme, ESWC 2007 invites</FONT>

<BR><FONT SIZE=3D2>tutorials on relevant topics of interest. A tutorial =
should present the state</FONT>

<BR><FONT SIZE=3D2>of the art of a semantic web area enabling attendees =
to fully appreciate the</FONT>

<BR><FONT SIZE=3D2>current issues, main schools of thought and possible =
application areas.</FONT>

<BR><FONT SIZE=3D2>Proposals for tutorials are welcome for the ESWC 2007 =
topics of interest (see</FONT>

<BR><FONT SIZE=3D2>bottom); tutorial proposals are requested to follow =
the submission process</FONT>

<BR><FONT SIZE=3D2>defined below.</FONT>
</P>

<P><FONT SIZE=3D2>TUTORIAL PROPOSALS</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>ESWC 2007 tutorials may be either for a full day or =
for a half day. Unless</FONT>

<BR><FONT SIZE=3D2>there is a clear rationale we will give preference to =
half day tutorials over</FONT>

<BR><FONT SIZE=3D2>full day tutorials.</FONT>
</P>

<P><FONT SIZE=3D2>Tutorials proposed for the ESWC 2007 should cover one =
topic in appropriate</FONT>

<BR><FONT SIZE=3D2>depth (see ESWC 2007 topics below), and present this =
in a appropriate manner</FONT>

<BR><FONT SIZE=3D2>which enables attendees to fully comprehend and apply =
emerging Semantic Web</FONT>

<BR><FONT SIZE=3D2>technologies. Although tutorials may focus entirely =
on theoretical aspects, we</FONT>

<BR><FONT SIZE=3D2>strongly encourage hands-on sessions where =
appropriate.</FONT>
</P>

<P><FONT SIZE=3D2>Tutorial proposals should not exceed 5 pages in DIN A4 =
format and should</FONT>

<BR><FONT SIZE=3D2>contain the following information:</FONT>
</P>

<P><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * abstract (200 words maximum; to =
be published on the ESWC 2007 website)</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * tutorial description (aims, =
content, presentation style, technical requirements)</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * relevance of the tutorial to =
ESWC 2007</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * outline of the tutorial content =
and schedule</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * information on presenters (name, =
affiliation, expertise, experiences in teaching and in tutorial =
presentation)</FONT>
</P>

<P><FONT SIZE=3D2>Tutorial proposals are to be submitted to Joerg =
Diederich, email: diederich at l3s dot de www: <A =
HREF=3D"http://www.l3s.de/~diederich">http://www.l3s.de/~diederich</A></F=
ONT></P>

<P><FONT SIZE=3D2>Submitted proposals that follow the above guidelines =
will be reviewed by the</FONT>

<BR><FONT SIZE=3D2>ESWC 2007 organizing committee with respect to the =
relevance of the topic, the</FONT>

<BR><FONT SIZE=3D2>content, and the presentation style.</FONT>
</P>

<P><FONT SIZE=3D2>Important Dates:</FONT>
</P>

<P><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * submission deadline for tutorial =
proposals: 19 December 2006</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * notification of acceptance: 18 =
January 2007</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * tutorial hand-outs due: 31 March =
2007</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * tutorial presentation date: 3 =
June 2007</FONT>
</P>

<P><FONT SIZE=3D2>For accepted tutorials, the presenters will need to =
submit the material for</FONT>

<BR><FONT SIZE=3D2>hand-outs (the slide sets and / or additional =
information; software</FONT>

<BR><FONT SIZE=3D2>installation and usage guides for practical hands-on =
sessions) to the</FONT>

<BR><FONT SIZE=3D2>organization committee for preprinting and placement =
on the ESWC 2007 website.</FONT>
</P>

<P><FONT SIZE=3D2>For each accepted tutorial, we offer one discount of =
180 EUR on the</FONT>

<BR><FONT SIZE=3D2>registration fee for ESWC 2007 (50% of the Early-Bird =
registration fee).</FONT>
</P>

<P><FONT SIZE=3D2>TOPIC LIST The topics of interest for tutorials =
include, but are not limited to</FONT>

<BR><FONT SIZE=3D2>the following:</FONT>
</P>

<P><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Ontology Management (creation, =
evolution, evaluation, etc.)</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Ontology Alignment (mapping, =
matching, merging, mediation and reconciliation)</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Ontology Learning and Metadata =
Generation (e.g. HLT and ML approaches)</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Multimedia and Semantic =
Web</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Annotation of =
Data</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Web Trust, Privacy, =
Security and Intellectual Property Rights</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Web Rules and Query =
Languages</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Logics for the Semantic =
Web</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Reasoning on the Semantic =
Web</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Behavior in the Semantic =
Web</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Searching, Querying, =
Visualizing, Navigating and Browsing the Semantic Web</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Personalization and User =
Modelling</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * User Interfaces and Semantic =
Web</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Grid and =
Middleware</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Web Services =
(description, discovery, invocation, composition, choreography, =
etc.)</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Web-based Knowledge =
Management (e.g. Semantic Desktop, Knowledge Portals)</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Web for e-Business, =
e-Culture, e-Government, e-Health, e-Learning, e-Science</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Database Technologies for the =
Semantic Web</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Data Semantics and Web =
Semantics</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Interoperability</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Workflows</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Web Mining</FONT>
</P>

<P><FONT SIZE=3D2>TUTORIAL CHAIR Joerg Diederich (L3S Research Center), =
diederich at l3s dot de, <A =
HREF=3D"http://www.l3s.de/~diederich">http://www.l3s.de/~diederich</A></F=
ONT>
</P>

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_______________________________________________
ESWC2007-Announce mailing list
ESWC2007-Announce@lists.deri.org
http://lists.deri.org/mailman/listinfo/eswc2007-announce

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Subject: [ESWC2007-Announce] call for workshops at ESWC 2007
Date: Fri, 3 Nov 2006 19:04:30 -0000
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==================================================================
	CALL FOR WORKSHOPS

	4th European Semantic Web Conference (ESWC 2007)
	3-7 June 2007
	Innsbruck, Austria

ESWC 2007 invites the submission of workshop proposals on specific aspects
of
the Semantic Web, particularly relating to the subject areas indicated by
the
topics below. We encourage workshops which will discuss fundamental research
issues driven by academic interests or more applied industrial or commercial
concerns. The format of the workshop will be determined by the organizers.
Workshops can vary in length from a half day to a full day. Having more than
one co-organizer for a workshop is strongly advised. Accepted workshops will
receive one free registration to the ESWC 2007 (full registration incl.
tutorial, workshop, conference, reception and conference dinner). Workshop
attendees must pay the ESWC 2007 workshop registration fee.


Important Dates


Workshop Proposals Due: November 30, 2006
Notification: December 11, 2006
URL for Workshop Website Due: January 21, 2007
Workshop: June 6-7, 2007
		
Proposal Requirements

Proposals for workshops should be no more than 3 pages in length. They
should
contain the following information:

   1. Title and brief technical description of the workshop, specifying the
goals and the technical issues that will be its focus.
   2. A brief description of why and to whom the workshop is of interest.
   3. A list of related workshops or similar events held in the last 3
years, or to be held in 2007.
   4. The names and contact information (web page, email address) of the
      proposed organizing committee. This committee should consist of two or
three
      people knowledgeable about the technical issues to be addressed,
preferably not
      members of the same institution.  
   5. A description of the qualifications of the
      proposed organizing committee with respect to organizing this workshop
(e.g.,
      papers published in the proposed topic area, previous workshop
organization,
      other relevant information).

Each workshop organizing committee will be responsible for the following:

    * Producing a web page and a "Call for Papers/Participation" for their
      workshop. The URL should be sent to the workshop chair. The call must
make it
      clear that the workshop is open to all members of the Semantic Web
community.
      It should also mention that at least one author of each accepted
submission
      must attend the workshop and that all workshop participants must pay
the ESWC
      2007 workshop registration fee, as well as the conference fee.
Finally, it
      should also clearly describe the process by which the Organizing
Committee will
      select the participants.  
    * Providing a brief description of the workshop for the conference web
page and program.
    * Selecting the participants and the format of the workshop.
    * Advertising the workshop beyond the conference web page.
    * Producing a camera-ready version of the workshop proceedings.

The ESWC 2007 Organizing Committee will be responsible for the following:

    * Providing a link to a workshop's local page.
    * Providing logistics support and a meeting place for the workshop.
    * In conjunction with the organizers, determining the workshop date and
time.
    * Providing copies of the workshop proceedings to attendees.


Proposal Submission


Workshop proposals and any enquiries should be sent by e-mail to Diana
Maynard.
Proposals should be submitted in PDF format. Submitted proposals that follow
the above requirements will be reviewed by the ESWC 2007 organizing
committee
with respect to the relevance of the topic and content.


Conference Topics of Interest and Area Keywords


Topics of interest to the conference include (but are not restricted to):

    * Ontology Management (creation, evolution, evaluation, etc.)
    * Ontology Alignment (mapping, matching, merging, mediation and
reconciliation)
    * Ontology Learning and Metadata Generation (e.g. HLT and ML approaches)
    * Multimedia and Semantic Web
    * Semantic Annotation of Data
    * Semantic Web Trust, Privacy, Security and Intellectual Property Rights
    * Semantic Web Rules and Query Languages
    * Logics for the Semantic Web
    * Reasoning on the Semantic Web
    * Behaviour in the Semantic Web
    * Searching, Querying, Visualizing, Navigating and Browsing the Semantic
Web
    * Personalization and User Modelling
    * User Interfaces and Semantic Web
    * Semantic Grid and Middleware
    * Semantic Web Services (description, discovery, invocation,
composition, choreography, etc.)
    * Semantic Web-based Knowledge Management (e.g. Semantic Desktop,
Knowledge Portals)
    * Semantic Web for e-Business, e-Culture, e-Government, e-Health,
e-Learning, e-Science
    * Database Technologies for the Semantic Web
    * Data Semantics and Web Semantics
    * Semantic Interoperability
    * Semantic Workflows
    * Semantic Web Mining


Workshop Chair


The ESWC 2007 Workshop chair is Diana Maynard (University of Sheffield, UK)
diana@dcs.shef.ac.uk 

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<P><FONT SIZE=3D2>[Apologies if you receive multiple copies]</FONT>
</P>

<P><FONT =
SIZE=3D2>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</FONT>

<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT SIZE=3D2>CALL FOR =
WORKSHOPS</FONT>
</P>

<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT SIZE=3D2>4th =
European Semantic Web Conference (ESWC 2007)</FONT>

<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT SIZE=3D2>3-7 June =
2007</FONT>

<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT SIZE=3D2>Innsbruck, =
Austria</FONT>
</P>

<P><FONT SIZE=3D2>ESWC 2007 invites the submission of workshop proposals =
on specific aspects of</FONT>

<BR><FONT SIZE=3D2>the Semantic Web, particularly relating to the =
subject areas indicated by the</FONT>

<BR><FONT SIZE=3D2>topics below. We encourage workshops which will =
discuss fundamental research</FONT>

<BR><FONT SIZE=3D2>issues driven by academic interests or more applied =
industrial or commercial</FONT>

<BR><FONT SIZE=3D2>concerns. The format of the workshop will be =
determined by the organizers.</FONT>

<BR><FONT SIZE=3D2>Workshops can vary in length from a half day to a =
full day. Having more than</FONT>

<BR><FONT SIZE=3D2>one co-organizer for a workshop is strongly advised. =
Accepted workshops will</FONT>

<BR><FONT SIZE=3D2>receive one free registration to the ESWC 2007 (full =
registration incl.</FONT>

<BR><FONT SIZE=3D2>tutorial, workshop, conference, reception and =
conference dinner). Workshop</FONT>

<BR><FONT SIZE=3D2>attendees must pay the ESWC 2007 workshop =
registration fee.</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>Important Dates</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>Workshop Proposals Due: November 30, 2006</FONT>

<BR><FONT SIZE=3D2>Notification: December 11, 2006</FONT>

<BR><FONT SIZE=3D2>URL for Workshop Website Due: January 21, 2007</FONT>

<BR><FONT SIZE=3D2>Workshop: June 6-7, 2007</FONT>

<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20

<BR><FONT SIZE=3D2>Proposal Requirements</FONT>
</P>

<P><FONT SIZE=3D2>Proposals for workshops should be no more than 3 pages =
in length. They should</FONT>

<BR><FONT SIZE=3D2>contain the following information:</FONT>
</P>

<P><FONT SIZE=3D2>&nbsp;&nbsp; 1. Title and brief technical description =
of the workshop, specifying the goals and the technical issues that will =
be its focus.</FONT></P>

<P><FONT SIZE=3D2>&nbsp;&nbsp; 2. A brief description of why and to whom =
the workshop is of interest.</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp; 3. A list of related workshops or =
similar events held in the last 3 years, or to be held in 2007.</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp; 4. The names and contact information =
(web page, email address) of the</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; proposed organizing =
committee. This committee should consist of two or three</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; people knowledgeable =
about the technical issues to be addressed, preferably not</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; members of the same =
institution.&nbsp; </FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp; 5. A description of the qualifications =
of the</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; proposed organizing =
committee with respect to organizing this workshop (e.g.,</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; papers published in =
the proposed topic area, previous workshop organization,</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; other relevant =
information).</FONT>
</P>

<P><FONT SIZE=3D2>Each workshop organizing committee will be responsible =
for the following:</FONT>
</P>

<P><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Producing a web page and a =
&quot;Call for Papers/Participation&quot; for their</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; workshop. The URL =
should be sent to the workshop chair. The call must make it</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; clear that the =
workshop is open to all members of the Semantic Web community.</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; It should also mention =
that at least one author of each accepted submission</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; must attend the =
workshop and that all workshop participants must pay the ESWC</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2007 workshop =
registration fee, as well as the conference fee. Finally, it</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; should also clearly =
describe the process by which the Organizing Committee will</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; select the =
participants.&nbsp; </FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Providing a brief description of =
the workshop for the conference web page and program.</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Selecting the participants and =
the format of the workshop.</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Advertising the workshop beyond =
the conference web page.</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Producing a camera-ready version =
of the workshop proceedings.</FONT>
</P>

<P><FONT SIZE=3D2>The ESWC 2007 Organizing Committee will be responsible =
for the following:</FONT>
</P>

<P><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Providing a link to a workshop's =
local page.</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Providing logistics support and =
a meeting place for the workshop.</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * In conjunction with the =
organizers, determining the workshop date and time.</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Providing copies of the workshop =
proceedings to attendees.</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>Proposal Submission</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>Workshop proposals and any enquiries should be sent by =
e-mail to Diana Maynard.</FONT>

<BR><FONT SIZE=3D2>Proposals should be submitted in PDF format. =
Submitted proposals that follow</FONT>

<BR><FONT SIZE=3D2>the above requirements will be reviewed by the ESWC =
2007 organizing committee</FONT>

<BR><FONT SIZE=3D2>with respect to the relevance of the topic and =
content.</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>Conference Topics of Interest and Area Keywords</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>Topics of interest to the conference include (but are =
not restricted to):</FONT>
</P>

<P><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Ontology Management (creation, =
evolution, evaluation, etc.)</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Ontology Alignment (mapping, =
matching, merging, mediation and reconciliation)</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Ontology Learning and Metadata =
Generation (e.g. HLT and ML approaches)</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Multimedia and Semantic =
Web</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Annotation of =
Data</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Web Trust, Privacy, =
Security and Intellectual Property Rights</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Web Rules and Query =
Languages</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Logics for the Semantic =
Web</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Reasoning on the Semantic =
Web</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Behaviour in the Semantic =
Web</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Searching, Querying, =
Visualizing, Navigating and Browsing the Semantic Web</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Personalization and User =
Modelling</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * User Interfaces and Semantic =
Web</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Grid and =
Middleware</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Web Services =
(description, discovery, invocation, composition, choreography, =
etc.)</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Web-based Knowledge =
Management (e.g. Semantic Desktop, Knowledge Portals)</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Web for e-Business, =
e-Culture, e-Government, e-Health, e-Learning, e-Science</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Database Technologies for the =
Semantic Web</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Data Semantics and Web =
Semantics</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Interoperability</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Workflows</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Web Mining</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>Workshop Chair</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>The ESWC 2007 Workshop chair is Diana Maynard =
(University of Sheffield, UK) diana@dcs.shef.ac.uk </FONT>
</P>

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_______________________________________________
ESWC2007-Announce mailing list
ESWC2007-Announce@lists.deri.org
http://lists.deri.org/mailman/listinfo/eswc2007-announce

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From: "Stijn Heymans" <stijn.heymans@deri.org>
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To: <eswc2007-announce@lists.deri.org>
Subject: [ESWC2007-Announce] CfP: ESWC 2007 - 4th European Semantic WebConference
Date: Fri, 3 Nov 2006 21:17:36 -0000
Organization: Digital Enterprise Research Institute (DERI)
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
         CALL FOR PAPERS=20

	ESWC 2007
	4th European Semantic Web Conference
=09
	3 - 7 June 2007=20
	Innsbruck (Austria)



The vision of the Semantic Web is to enhance today=E2=80=99s web via the =
exploitation
of machine-processable meta data. The explicit representation of the =
semantics
of data, enriched with domain theories (Ontologies), will enable a web =
that
provides a qualitatively new level of service. It will weave together a =
large
network of human knowledge and makes this knowledge machine-processable.
Various automated services will help the users to achieve their goals by
accessing and processing information in machine-understandable form. =
This
network of knowledge systems will ultimately lead to truly intelligent =
systems,
which will be employed for various specialized reasoning subsystems to
accomplish complex tasks. Many technologies and methodologies are being
developed within Artificial Intelligence, Natural Language Processing, =
Machine
Learning, Databases, Multimedia Systems, Distributed Systems, Software
Engineering and Information Systems that can contribute towards the =
realization
of this vision.

The 4th Annual European Semantic Web Conference (ESWC 2007) will present =
the
latest results in research and application of Semantic Web technologies,
including knowledge mark-up languages, Semantic Web services, and =
ontology
management. ESWC 2007 will also feature a special industry-oriented =
event, a
forum for gaining a better understanding of these new technologies and =
their
business aspects. The conference will offer a tutorial program to get up =
to
speed with European and global developments in this exciting new area.

Several distinguished scientists will give an invited talk at the
conference; among them, prof. Stefano Ceri (Tech. Univ. of Milan,
Italy), prof. Georg Gottlob (Oxford Univ., UK), prof. Ning Zhong
(Maebashi Institute of Technology, Japan).

ESWC 2007 is sponsored by ESSI - a group of European Commission 6th =
Framework
Programme projects. Together these projects aim to improve world-wide =
research
and standardisation in the area of the Semantic Web. For more =
information on
ESSI, please visit www.essi-cluster.org. =20


Submissions


ESWC 2007 welcomes the submission of excellent original research and
application papers dealing with all aspects of the Semantic Web, =
particularly
those related to the subject areas indicated by the topics below. We
particularly encourage the submission of papers on industrial efforts =
and
experiences with Semantic Web projects. We encourage theoretical,
methodological, empirical, and applications papers.

The proceedings of this conference will be published in =
Springer=E2=80=99s Lecture
Notes in Computer Science series. Paper submission and reviewing for =
ESWC 2007
will be electronic, via the conference Web site: =
http://www.eswc2007.org/.
Papers, due 15 December, 2006, should not exceed fifteen (15) pages in =
Springer
LNCS format.

Papers may be accepted as (i) full papers, or as (ii) short papers with =
poster
presentation.


Important Dates


Abstract Submission: 8 December, 2006
Full Paper Submission: 15 December, 2006
Notification: 26 February, 2007
Camera-Ready Papers due: 16 March, 2007
Conference: 3 - 7 June, 2007


Conference Topics of Interest


Topics of interest to the conference include (but are not restricted =
to):

    * Ontology Management (creation, evolution, evaluation, etc.)
    * Ontology Alignment (mapping, matching, merging, mediation and =
reconciliation)
    * Ontology Learning and Metadata Generation (e.g. HLT and ML =
approaches)
    * Multimedia and Semantic Web
    * Semantic Annotation of Data
    * Semantic Web Trust, Privacy, Security and Intellectual Property =
Rights
    * Semantic Web Rules and Query Languages
    * Logics for the Semantic Web
    * Reasoning on the Semantic Web
    * Behavior in the Semantic Web
    * Searching, Querying, Visualizing, Navigating and Browsing the =
Semantic Web
    * Personalization and User Modelling
    * User Interfaces and Semantic Web
    * Semantic Grid and Middleware
    * Semantic Web Services (description, discovery, invocation, =
composition, choreography, etc.)
    * Semantic Web-based Knowledge Management (e.g. Semantic Desktop, =
Knowledge Portals)
    * Semantic Web for e-Business, e-Culture, e-Government, e-Health, =
e-Learning, e-Science
    * Database Technologies for the Semantic Web
    * Data Semantics and Web Semantics
    * Semantic Interoperability
    * Semantic Workflows
    * Semantic Web Mining

We particularly welcome application papers which clearly show benefits =
of
Semantic Web technologies in practical settings.


General Chair


Enrico Franconi (Free University of Bozen-Bolzano, Italy), =
franconi@inf.unibz.it


Program Chairs


Michael Kifer (State University of New York at Stony Brook, USA), =
kifer@cs.stonybrook.edu
Wolfgang May (Georg-August-Universit=C3=A4t G=C3=B6ttingen, Germany), =
may@informatik.uni-goettingen.de

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<TITLE>[ESWC2007-Announce] CfP: ESWC 2007 - 4th European Semantic =
WebConference</TITLE>
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<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT SIZE=3D2>[Apologies =
if you receive multiple copies]</FONT>
</P>

<P><FONT =
SIZE=3D2>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CALL =
FOR PAPERS </FONT>
</P>

<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT SIZE=3D2>ESWC =
2007</FONT>

<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT SIZE=3D2>4th =
European Semantic Web Conference</FONT>

<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20

<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT SIZE=3D2>3 - 7 June =
2007 </FONT>

<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT SIZE=3D2>Innsbruck =
(Austria)</FONT>
</P>
<BR>
<BR>

<P><FONT SIZE=3D2>The vision of the Semantic Web is to enhance =
today=E2=80=99s web via the exploitation</FONT>

<BR><FONT SIZE=3D2>of machine-processable meta data. The explicit =
representation of the semantics</FONT>

<BR><FONT SIZE=3D2>of data, enriched with domain theories (Ontologies), =
will enable a web that</FONT>

<BR><FONT SIZE=3D2>provides a qualitatively new level of service. It =
will weave together a large</FONT>

<BR><FONT SIZE=3D2>network of human knowledge and makes this knowledge =
machine-processable.</FONT>

<BR><FONT SIZE=3D2>Various automated services will help the users to =
achieve their goals by</FONT>

<BR><FONT SIZE=3D2>accessing and processing information in =
machine-understandable form. This</FONT>

<BR><FONT SIZE=3D2>network of knowledge systems will ultimately lead to =
truly intelligent systems,</FONT>

<BR><FONT SIZE=3D2>which will be employed for various specialized =
reasoning subsystems to</FONT>

<BR><FONT SIZE=3D2>accomplish complex tasks. Many technologies and =
methodologies are being</FONT>

<BR><FONT SIZE=3D2>developed within Artificial Intelligence, Natural =
Language Processing, Machine</FONT>

<BR><FONT SIZE=3D2>Learning, Databases, Multimedia Systems, Distributed =
Systems, Software</FONT>

<BR><FONT SIZE=3D2>Engineering and Information Systems that can =
contribute towards the realization</FONT>

<BR><FONT SIZE=3D2>of this vision.</FONT>
</P>

<P><FONT SIZE=3D2>The 4th Annual European Semantic Web Conference (ESWC =
2007) will present the</FONT>

<BR><FONT SIZE=3D2>latest results in research and application of =
Semantic Web technologies,</FONT>

<BR><FONT SIZE=3D2>including knowledge mark-up languages, Semantic Web =
services, and ontology</FONT>

<BR><FONT SIZE=3D2>management. ESWC 2007 will also feature a special =
industry-oriented event, a</FONT>

<BR><FONT SIZE=3D2>forum for gaining a better understanding of these new =
technologies and their</FONT>

<BR><FONT SIZE=3D2>business aspects. The conference will offer a =
tutorial program to get up to</FONT>

<BR><FONT SIZE=3D2>speed with European and global developments in this =
exciting new area.</FONT>
</P>

<P><FONT SIZE=3D2>Several distinguished scientists will give an invited =
talk at the</FONT>

<BR><FONT SIZE=3D2>conference; among them, prof. Stefano Ceri (Tech. =
Univ. of Milan,</FONT>

<BR><FONT SIZE=3D2>Italy), prof. Georg Gottlob (Oxford Univ., UK), prof. =
Ning Zhong</FONT>

<BR><FONT SIZE=3D2>(Maebashi Institute of Technology, Japan).</FONT>
</P>

<P><FONT SIZE=3D2>ESWC 2007 is sponsored by ESSI - a group of European =
Commission 6th Framework</FONT>

<BR><FONT SIZE=3D2>Programme projects. Together these projects aim to =
improve world-wide research</FONT>

<BR><FONT SIZE=3D2>and standardisation in the area of the Semantic Web. =
For more information on</FONT>

<BR><FONT SIZE=3D2>ESSI, please visit www.essi-cluster.org.&nbsp; =
</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>Submissions</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>ESWC 2007 welcomes the submission of excellent =
original research and</FONT>

<BR><FONT SIZE=3D2>application papers dealing with all aspects of the =
Semantic Web, particularly</FONT>

<BR><FONT SIZE=3D2>those related to the subject areas indicated by the =
topics below. We</FONT>

<BR><FONT SIZE=3D2>particularly encourage the submission of papers on =
industrial efforts and</FONT>

<BR><FONT SIZE=3D2>experiences with Semantic Web projects. We encourage =
theoretical,</FONT>

<BR><FONT SIZE=3D2>methodological, empirical, and applications =
papers.</FONT>
</P>

<P><FONT SIZE=3D2>The proceedings of this conference will be published =
in Springer=E2=80=99s Lecture</FONT>

<BR><FONT SIZE=3D2>Notes in Computer Science series. Paper submission =
and reviewing for ESWC 2007</FONT>

<BR><FONT SIZE=3D2>will be electronic, via the conference Web site: <A =
HREF=3D"http://www.eswc2007.org/">http://www.eswc2007.org/</A>.</FONT>

<BR><FONT SIZE=3D2>Papers, due 15 December, 2006, should not exceed =
fifteen (15) pages in Springer</FONT>

<BR><FONT SIZE=3D2>LNCS format.</FONT>
</P>

<P><FONT SIZE=3D2>Papers may be accepted as (i) full papers, or as (ii) =
short papers with poster</FONT>

<BR><FONT SIZE=3D2>presentation.</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>Important Dates</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>Abstract Submission: 8 December, 2006</FONT>

<BR><FONT SIZE=3D2>Full Paper Submission: 15 December, 2006</FONT>

<BR><FONT SIZE=3D2>Notification: 26 February, 2007</FONT>

<BR><FONT SIZE=3D2>Camera-Ready Papers due: 16 March, 2007</FONT>

<BR><FONT SIZE=3D2>Conference: 3 - 7 June, 2007</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>Conference Topics of Interest</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>Topics of interest to the conference include (but are =
not restricted to):</FONT>
</P>

<P><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Ontology Management (creation, =
evolution, evaluation, etc.)</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Ontology Alignment (mapping, =
matching, merging, mediation and reconciliation)</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Ontology Learning and Metadata =
Generation (e.g. HLT and ML approaches)</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Multimedia and Semantic =
Web</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Annotation of =
Data</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Web Trust, Privacy, =
Security and Intellectual Property Rights</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Web Rules and Query =
Languages</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Logics for the Semantic =
Web</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Reasoning on the Semantic =
Web</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Behavior in the Semantic =
Web</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Searching, Querying, =
Visualizing, Navigating and Browsing the Semantic Web</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Personalization and User =
Modelling</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * User Interfaces and Semantic =
Web</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Grid and =
Middleware</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Web Services =
(description, discovery, invocation, composition, choreography, =
etc.)</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Web-based Knowledge =
Management (e.g. Semantic Desktop, Knowledge Portals)</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Web for e-Business, =
e-Culture, e-Government, e-Health, e-Learning, e-Science</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Database Technologies for the =
Semantic Web</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Data Semantics and Web =
Semantics</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Interoperability</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Workflows</FONT>

<BR><FONT SIZE=3D2>&nbsp;&nbsp;&nbsp; * Semantic Web Mining</FONT>
</P>

<P><FONT SIZE=3D2>We particularly welcome application papers which =
clearly show benefits of</FONT>

<BR><FONT SIZE=3D2>Semantic Web technologies in practical =
settings.</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>General Chair</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>Enrico Franconi (Free University of Bozen-Bolzano, =
Italy), franconi@inf.unibz.it</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>Program Chairs</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>Michael Kifer (State University of New York at Stony =
Brook, USA), kifer@cs.stonybrook.edu</FONT>

<BR><FONT SIZE=3D2>Wolfgang May (Georg-August-Universit=C3=A4t =
G=C3=B6ttingen, Germany), may@informatik.uni-goettingen.de</FONT>
</P>

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_______________________________________________
ESWC2007-Announce mailing list
ESWC2007-Announce@lists.deri.org
http://lists.deri.org/mailman/listinfo/eswc2007-announce

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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: "Semantics" <semantics@ivoa.net>
Subject: FW: [SEM-GRD] [CFP]AAAI2007's Workshop on Semantic E-Science (SeS2007)
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fyi...


  _____ =20

From: sem-grd-bounces@ogf.org [mailto:sem-grd-bounces@ogf.org] On Behalf =
Of
Yimin Wang
Sent: 05 January 2007 13:12
To: sem-grd@ogf.org
Subject: [SEM-GRD] [CFP]AAAI2007's Workshop on Semantic E-Science =
(SeS2007)



Call for Papers
=20

[Apologies for multiple copies]

*******************************************************

AAAI2007's Workshop on Semantic e-Science (SeS07)

23 July, 2007, Vancouver, Canada, co-located with AAAI'07
http://neuroweb.med.yale.edu/ <http://neuroweb.med.yale.edu/ses2007> =
ses2007


*******************************************************

As semantic technology has been gaining momentum in various e-Science =
areas
(for=20

example, W3C's new interest group for semantic web health care and life=20

science), it is important to offer semantic-based methodologies, tools,=20

middleware to facilitate scientific knowledge modeling, logical-based
hypothesis=20

checking, semantic data integration and application composition, =
integrated=20

knowledge discovery and data analyzing for different e-Science =
applications.

=20

Partially influenced by the Artificial Intelligence community, the =
Semantic
Web=20

researchers have largely focused on formal aspects of semantic
representation=20

languages or general-purpose semantic application development, with
inadequate=20

consideration of requirements from specific science areas. On the other
hand,=20

general science researchers are growing ever more dependent on the web, =
but
they=20

have no coherent agenda for exploring the emerging trends on the =
semantic
web=20

technologies. It urgently requires the development of a =
multi-disciplinary
field=20

to foster the growth and development of e-Science applications based on =
the=20

semantic technologies and related knowledge-based approaches.=20

=20

SeS2007 aims to provide an inter-disciplinary forum for researchers from
both=20

the Semantic Web community, and general science communities including =
the
life=20

science community.

=20

Semantic e-Science Foundations:

  Knowledge Representation for e-Science=20

  Ontology Engineering for e-Science=20

  Knowledge Integration for e-Science=20

  Knowledge Management for e-Science=20

  Semantic Data Integration=20

  Semantic Web Services=20

  e-Science Process Management=20

  Semantic Infrastructure and Architecture for e-Science=20

  Semantic Grid Middleware=20

  Data Mining and Knowledge Discovery=20

=20

Semantic Web Applications and Ontologies for:

  Semantic Web for Health Care and Life Science=20

  Semantic Web for Bio-Med-informatics=20

  Semantic Web for System and Integrated Biology=20

  Semantic Web for Translational Medicine=20

  Biological Semantic Network=20

  Semantic Web for Geography, Environment and Climate=20

  Semantic Web for Chemistry, Physics and Mechanics=20

  Semantic Web and Digital Libraries and Scientific Publication=20

=20

Submission and Proceedings

=20

=20

We invite academic/industrial researchers and practitioners to submit
original=20

research papers, well-written surveys, or papers describing deployed =
systems
to=20

the workshop. The papers must not exceed 8 pages in length including
references=20

and should be prepared using the AAAI formatting guidelines. The papers
should=20

be submitted by using the paper submission system at=20

http://www.easychair.org/SeS2007AAAI2007/  no later than March 27,2007. =
Each


paper will be reviewed by at least 2 members of the PC. Authors of =
accepted=20

papers will be required to submit final camera-ready copy to the =
organizers
on=20

May 15,2007.

=20

The workshop proceeding will be published as AAAI technical report. All
accepted=20

papers will be included in the AAAI Digital Library, and distributed by
AAAI.=20

Besides, as like SeS2006, we are planning to organize journal special =
issues
for=20

extended version of selected high-quality work.

=20

=20

Important Dates

  Submission deadline: March 27, 2007=20

  Notification date: April 25, 2007=20

  Author accepted paper submission deadline: May 15, 2007=20

  Workshop date: July 23,2007 (to be settled)=20

=20

Workshop Organizing Committee

=20

Huajun Chen

College of Computer Science, Zhejiang University, Hangzhou, 310027, CN

Yale Center for Medical Informatics, Yale University, CT 06520-8009, USA

huajunsir@zju.edu.cn <http://edu.cn/> =20

=20

=20

Yimin Wang

Institute AIFB, University of Karlsruhe, 76128 Karlsruhe, Germany

ywa@aifb.uni-karlsruhe.de=20

=20

=20

Kei Cheung

Yale Center for Medical Informatics, Yale University, CT 06520-8009, USA

kei.cheung@yale.edu=20

=20

=20

Zhaohui Wu

College of Computer Science, Zhejiang University, Hangzhou, 310027, CN

wzh@zju.edu.cn=20

=20

=20

Workshop Program Committee

=20

Peter Fox, National Center for Atmospheric Research, USA

Li Ding, Stanford University, USA=20

Sumi Yoshikawa, Tokyo Institue of Technology, Japan=20

Helen Chen, Agfa Healthcare, USA=20

Joanne Luciano, Harvard University, USA

Nigam Shah, Stanford University, USA=20

Natalia Maltsev, Argonne National Laboratory, USA

John F. Madden, Duke University Medical Cente, USA=20

Peter Mork, MITRE Corporation, USA

Nigel Shadbolt, University of Southampton, UK

York Sure, University of Karlsruhe, Germany=20

Young-Tack Park, Soongsil University, Korea=20

Hai Wang, University of Southampton, UK=20

Robert Stevens, University of Manchester, UK=20

Marta Iglesias, FAO, United Nations=20

Heiner Stuckenschmidt, University of Mannheim, Germany=20

William Cheng, Hong Kong Baptist University, CN HK=20

Jacek Kitowski, AGH University of Sci. and Tech., Poland=20

Takahira Yamaguchi, Keio University, Japan Mathieu d'Aquin, Open =
University,
UK=20

Vasant Honavar, Iowa State University, USA

Alan Ruttenburg, Millennium Pharmaceuticals, USA=20

Christopher Baker, Institute for Infocomm Research (I=B2R), Singapore=20

Jeff Pan, University of Aberdeen, UK=20

Dejing Dou, University of Oregon, USA

Peter Haase, University of Karlsruhe, Germany=20

Volker Haarselv, Concordia University, Canada=20

Vipul Kashyap, Partners HealthCare System, Inc., USA


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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 6.00.5730.11" name=3DGENERATOR></HEAD>
<BODY>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff =
size=3D2><SPAN=20
class=3D906494416-05012007>fyi...</SPAN></FONT></DIV><BR>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
  <DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
  <HR tabIndex=3D-1>
  <FONT face=3DTahoma size=3D2><B>From:</B> sem-grd-bounces@ogf.org=20
  [mailto:sem-grd-bounces@ogf.org] <B>On Behalf Of </B>Yimin=20
  Wang<BR><B>Sent:</B> 05 January 2007 13:12<BR><B>To:</B>=20
  sem-grd@ogf.org<BR><B>Subject:</B> [SEM-GRD] [CFP]AAAI2007's Workshop =
on=20
  Semantic E-Science (SeS2007)<BR></FONT><BR></DIV>
  <DIV></DIV>
  <P><SPAN lang=3DEN-US>Call for Papers<BR>&nbsp;</SPAN></P>
  <P><SPAN lang=3DEN-US>[Apologies for multiple copies]</SPAN></P>
  <P><SPAN=20
  =
lang=3DEN-US>*******************************************************</SPA=
N></P>
  <P><SPAN lang=3DEN-US>AAAI2007's Workshop on Semantic e-Science=20
  (SeS07)</SPAN></P>
  <P><SPAN lang=3DEN-US>23 July, 2007, Vancouver, Canada, co-located =
with=20
  AAAI'07&nbsp; <A onclick=3D"return =
top.js.OpenExtLink(window,event,this)"=20
  href=3D"http://neuroweb.med.yale.edu/ses2007"=20
  target=3D_blank>http://neuroweb.med.yale.edu/<SPAN =
name=3D"st">ses2007</SPAN>=20
  </A></SPAN></P>
  <P><SPAN=20
  =
lang=3DEN-US>*******************************************************</SPA=
N></P>
  <P><SPAN lang=3DEN-US>As semantic technology has been gaining momentum =
in=20
  various e-Science areas (for </SPAN></P>
  <P><SPAN lang=3DEN-US>example, W3C's new interest group for semantic =
web health=20
  care and life </SPAN></P>
  <P><SPAN lang=3DEN-US>science), it is important to offer =
semantic-based=20
  methodologies, tools, </SPAN></P>
  <P><SPAN lang=3DEN-US>middleware to facilitate scientific knowledge =
modeling,=20
  logical-based hypothesis </SPAN></P>
  <P><SPAN lang=3DEN-US>checking, semantic data integration and =
application=20
  composition, integrated </SPAN></P>
  <P><SPAN lang=3DEN-US>knowledge discovery and data analyzing for =
different=20
  e-Science applications.</SPAN></P>
  <P><SPAN lang=3DEN-US></SPAN>&nbsp;</P>
  <P><SPAN lang=3DEN-US>Partially influenced by the Artificial =
Intelligence=20
  community, the Semantic Web </SPAN></P>
  <P><SPAN lang=3DEN-US>researchers have largely focused on formal =
aspects of=20
  semantic representation </SPAN></P>
  <P><SPAN lang=3DEN-US>languages or general-purpose semantic =
application=20
  development, with inadequate </SPAN></P>
  <P><SPAN lang=3DEN-US>consideration of requirements from specific =
science areas.=20
  On the other hand, </SPAN></P>
  <P><SPAN lang=3DEN-US>general science researchers are growing ever =
more=20
  dependent on the web, but they </SPAN></P>
  <P><SPAN lang=3DEN-US>have no coherent agenda for exploring the =
emerging trends=20
  on the semantic web </SPAN></P>
  <P><SPAN lang=3DEN-US>technologies. It urgently requires the =
development of a=20
  multi-disciplinary field </SPAN></P>
  <P><SPAN lang=3DEN-US>to foster the growth and development of =
e-Science=20
  applications based on the </SPAN></P>
  <P><SPAN lang=3DEN-US>semantic technologies and related =
knowledge-based=20
  approaches. </SPAN></P>
  <P><SPAN lang=3DEN-US></SPAN>&nbsp;</P>
  <P><SPAN lang=3DEN-US><SPAN name=3D"st">SeS2007</SPAN> aims to provide =
an=20
  inter-disciplinary forum for researchers from both </SPAN></P>
  <P><SPAN lang=3DEN-US>the Semantic Web community, and general science=20
  communities including the life </SPAN></P>
  <P><SPAN lang=3DEN-US>science community.</SPAN></P>
  <P><SPAN lang=3DEN-US></SPAN>&nbsp;</P>
  <P><SPAN lang=3DEN-US>Semantic e-Science Foundations:</SPAN></P>
  <P><SPAN lang=3DEN-US>&nbsp; Knowledge Representation for e-Science =
</SPAN></P>
  <P><SPAN lang=3DEN-US>&nbsp; Ontology Engineering for e-Science =
</SPAN></P>
  <P><SPAN lang=3DEN-US>&nbsp; Knowledge Integration for e-Science =
</SPAN></P>
  <P><SPAN lang=3DEN-US>&nbsp; Knowledge Management for e-Science =
</SPAN></P>
  <P><SPAN lang=3DEN-US>&nbsp; Semantic Data Integration </SPAN></P>
  <P><SPAN lang=3DEN-US>&nbsp; Semantic Web Services </SPAN></P>
  <P><SPAN lang=3DEN-US>&nbsp; e-Science Process Management </SPAN></P>
  <P><SPAN lang=3DEN-US>&nbsp; Semantic Infrastructure and Architecture =
for=20
  e-Science </SPAN></P>
  <P><SPAN lang=3DEN-US>&nbsp; Semantic Grid Middleware </SPAN></P>
  <P><SPAN lang=3DEN-US>&nbsp; Data Mining and Knowledge Discovery =
</SPAN></P>
  <P><SPAN lang=3DEN-US></SPAN>&nbsp;</P>
  <P><SPAN lang=3DEN-US>Semantic Web Applications and Ontologies =
for:</SPAN></P>
  <P><SPAN lang=3DEN-US>&nbsp; Semantic Web for Health Care and Life =
Science=20
  </SPAN></P>
  <P><SPAN lang=3DEN-US>&nbsp; Semantic Web for Bio-Med-informatics =
</SPAN></P>
  <P><SPAN lang=3DEN-US>&nbsp; Semantic Web for System and Integrated =
Biology=20
  </SPAN></P>
  <P><SPAN lang=3DEN-US>&nbsp; Semantic Web for Translational Medicine =
</SPAN></P>
  <P><SPAN lang=3DEN-US>&nbsp; Biological Semantic Network </SPAN></P>
  <P><SPAN lang=3DEN-US>&nbsp; Semantic Web for Geography, Environment =
and Climate=20
  </SPAN></P>
  <P><SPAN lang=3DEN-US>&nbsp; Semantic Web for Chemistry, Physics and =
Mechanics=20
  </SPAN></P>
  <P><SPAN lang=3DEN-US>&nbsp; Semantic Web and Digital Libraries and =
Scientific=20
  Publication </SPAN></P>
  <P><SPAN lang=3DEN-US></SPAN>&nbsp;</P>
  <P><SPAN lang=3DEN-US>Submission and Proceedings</SPAN></P>
  <P><SPAN lang=3DEN-US></SPAN>&nbsp;</P>
  <P><SPAN lang=3DEN-US></SPAN>&nbsp;</P>
  <P><SPAN lang=3DEN-US>We invite academic/industrial researchers and=20
  practitioners to submit original </SPAN></P>
  <P><SPAN lang=3DEN-US>research papers, well-written surveys, or papers =

  describing deployed systems to </SPAN></P>
  <P><SPAN lang=3DEN-US>the workshop. The papers must not exceed 8 pages =
in length=20
  including references </SPAN></P>
  <P><SPAN lang=3DEN-US>and should be prepared using the AAAI formatting =

  guidelines. The papers should </SPAN></P>
  <P><SPAN lang=3DEN-US>be submitted by using the paper submission =
system at=20
  </SPAN></P>
  <P><SPAN lang=3DEN-US><A onclick=3D"return =
top.js.OpenExtLink(window,event,this)"=20
  href=3D"http://www.easychair.org/SeS2007AAAI2007/"=20
  target=3D_blank>http://www.easychair.org/SeS2007AAAI2007/</A><SPAN=20
  style=3D"COLOR: rgb(31,73,125)"> </SPAN>&nbsp;no later than March =
27,2007. Each=20
  </SPAN></P>
  <P><SPAN lang=3DEN-US>paper will be reviewed by at least 2 members of =
the PC.=20
  Authors of accepted </SPAN></P>
  <P><SPAN lang=3DEN-US>papers will be required to submit final =
camera-ready copy=20
  to the organizers on </SPAN></P>
  <P><SPAN lang=3DEN-US>May 15,2007.</SPAN></P>
  <P><SPAN lang=3DEN-US></SPAN>&nbsp;</P>
  <P><SPAN lang=3DEN-US>The workshop proceeding will be published as =
AAAI=20
  technical report. All accepted </SPAN></P>
  <P><SPAN lang=3DEN-US>papers will be included in the AAAI Digital =
Library, and=20
  distributed by AAAI. </SPAN></P>
  <P><SPAN lang=3DEN-US>Besides, as <SPAN style=3D"COLOR: =
rgb(31,73,125)">like=20
  </SPAN>SeS2006, we are planning to organize journal special issues for =

  </SPAN></P>
  <P><SPAN lang=3DEN-US>extended version of selected high-quality =
work.</SPAN></P>
  <P><SPAN lang=3DEN-US></SPAN>&nbsp;</P>
  <P><SPAN lang=3DEN-US></SPAN>&nbsp;</P>
  <P><SPAN lang=3DEN-US>Important Dates</SPAN></P>
  <P><SPAN lang=3DEN-US>&nbsp; Submission deadline: March 27, 2007 =
</SPAN></P>
  <P><SPAN lang=3DEN-US>&nbsp; Notification date: April 25, 2007 =
</SPAN></P>
  <P><SPAN lang=3DEN-US>&nbsp; Author accepted paper submission =
deadline: May 15,=20
  2007 </SPAN></P>
  <P><SPAN lang=3DEN-US>&nbsp; Workshop date: July 23,2007 (to be =
settled)=20
  </SPAN></P>
  <P><SPAN lang=3DEN-US></SPAN>&nbsp;</P>
  <P><SPAN lang=3DEN-US>Workshop Organizing Committee</SPAN></P>
  <P><SPAN lang=3DEN-US></SPAN>&nbsp;</P>
  <P><SPAN lang=3DEN-US>Huajun Chen</SPAN></P>
  <P><SPAN lang=3DEN-US>College of Computer Science, Zhejiang =
University,=20
  Hangzhou, 310027, CN</SPAN></P>
  <P><SPAN lang=3DEN-US>Yale Center for Medical Informatics, Yale =
University, CT=20
  06520-8009, USA</SPAN></P>
  <P><SPAN lang=3DEN-US>huajunsir@zju.<A=20
  onclick=3D"return top.js.OpenExtLink(window,event,this)" =
href=3D"http://edu.cn/"=20
  target=3D_blank>edu.cn</A> </SPAN></P>
  <P><SPAN lang=3DEN-US></SPAN>&nbsp;</P>
  <P><SPAN lang=3DEN-US></SPAN>&nbsp;</P>
  <P><SPAN lang=3DEN-US>Yimin Wang</SPAN></P>
  <P><SPAN lang=3DEN-US>Institute AIFB, University of Karlsruhe, 76128 =
Karlsruhe,=20
  Germany</SPAN></P>
  <P><SPAN lang=3DEN-US><A onclick=3D"return =
top.js.OpenExtLink(window,event,this)"=20
  href=3D"mailto:ywa@aifb.uni-karlsruhe.de"=20
  target=3D_blank>ywa@aifb.uni-karlsruhe.de</A> </SPAN></P>
  <P><SPAN lang=3DEN-US></SPAN>&nbsp;</P>
  <P><SPAN lang=3DEN-US></SPAN>&nbsp;</P>
  <P><SPAN lang=3DEN-US>Kei Cheung</SPAN></P>
  <P><SPAN lang=3DEN-US>Yale Center for Medical Informatics, Yale =
University, CT=20
  06520-8009, USA</SPAN></P>
  <P><SPAN lang=3DEN-US><A onclick=3D"return =
top.js.OpenExtLink(window,event,this)"=20
  href=3D"mailto:kei.cheung@yale.edu" =
target=3D_blank>kei.cheung@yale.edu</A>=20
  </SPAN></P>
  <P><SPAN lang=3DEN-US></SPAN>&nbsp;</P>
  <P><SPAN lang=3DEN-US></SPAN>&nbsp;</P>
  <P><SPAN lang=3DEN-US>Zhaohui Wu</SPAN></P>
  <P><SPAN lang=3DEN-US>College of Computer Science, Zhejiang =
University,=20
  Hangzhou, 310027, CN</SPAN></P>
  <P><SPAN lang=3DEN-US><A onclick=3D"return =
top.js.OpenExtLink(window,event,this)"=20
  href=3D"mailto:wzh@zju.edu" target=3D_blank>wzh@zju.edu</A>.cn =
</SPAN></P>
  <P><SPAN lang=3DEN-US></SPAN>&nbsp;</P>
  <P><SPAN lang=3DEN-US></SPAN>&nbsp;</P>
  <P><SPAN lang=3DEN-US>Workshop Program Committee</SPAN></P>
  <P><SPAN lang=3DEN-US></SPAN>&nbsp;</P>
  <P><SPAN lang=3DEN-US>Peter Fox, National Center for Atmospheric =
Research,=20
  USA</SPAN></P>
  <P><SPAN lang=3DEN-US>Li Ding, Stanford University, USA </SPAN></P>
  <P><SPAN lang=3DEN-US>Sumi Yoshikawa, Tokyo Institue of Technology, =
Japan=20
  </SPAN></P>
  <P><SPAN lang=3DEN-US>Helen Chen, Agfa Healthcare, USA </SPAN></P>
  <P><SPAN lang=3DEN-US>Joanne Luciano, Harvard University, =
USA</SPAN></P>
  <P><SPAN lang=3DEN-US>Nigam Shah, Stanford University, USA </SPAN></P>
  <P><SPAN lang=3DEN-US>Natalia Maltsev, Argonne National Laboratory,=20
  USA</SPAN></P>
  <P><SPAN lang=3DEN-US>John F. Madden, Duke University Medical Cente, =
USA=20
  </SPAN></P>
  <P><SPAN lang=3DEN-US>Peter Mork, MITRE Corporation, USA</SPAN></P>
  <P><SPAN lang=3DEN-US>Nigel Shadbolt, University of Southampton, =
UK</SPAN></P>
  <P><SPAN lang=3DEN-US>York Sure, University of Karlsruhe, Germany =
</SPAN></P>
  <P><SPAN lang=3DEN-US>Young-Tack Park, Soongsil University, Korea =
</SPAN></P>
  <P><SPAN lang=3DEN-US>Hai Wang, University of Southampton, UK =
</SPAN></P>
  <P><SPAN lang=3DEN-US>Robert Stevens, University of Manchester, UK =
</SPAN></P>
  <P><SPAN lang=3DEN-US>Marta Iglesias, FAO, United Nations </SPAN></P>
  <P><SPAN lang=3DEN-US>Heiner Stuckenschmidt, University of Mannheim, =
Germany=20
  </SPAN></P>
  <P><SPAN lang=3DEN-US>William Cheng, Hong Kong Baptist University, CN =
HK=20
  </SPAN></P>
  <P><SPAN lang=3DEN-US>Jacek Kitowski, AGH University of Sci. and =
Tech., Poland=20
  </SPAN></P>
  <P><SPAN lang=3DEN-US>Takahira Yamaguchi, Keio University, Japan =
Mathieu=20
  d'Aquin, Open University, UK </SPAN></P>
  <P><SPAN lang=3DEN-US>Vasant Honavar, Iowa State University, =
USA</SPAN></P>
  <P><SPAN lang=3DEN-US>Alan Ruttenburg, Millennium Pharmaceuticals, USA =

  </SPAN></P>
  <P><SPAN lang=3DEN-US>Christopher Baker, Institute for Infocomm =
Research (I=B2R),=20
  Singapore </SPAN></P>
  <P><SPAN lang=3DEN-US>Jeff Pan, University of Aberdeen, UK </SPAN></P>
  <P><SPAN lang=3DEN-US>Dejing Dou, University of Oregon, USA</SPAN></P>
  <P><SPAN lang=3DEN-US>Peter Haase, University of Karlsruhe, Germany =
</SPAN></P>
  <P><SPAN lang=3DEN-US>Volker Haarselv, Concordia University, Canada =
</SPAN></P>
  <P><SPAN lang=3DEN-US>Vipul Kashyap, Partners HealthCare System, Inc., =

  USA</SPAN></P></BLOCKQUOTE><SPAN lang=3DEN-US></SPAN></BODY></HTML>

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From owner-semantics@eso.org  Wed Feb 21 16:22:54 2007
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Message-ID: <20070221162208.3kfmmx1swk4kowgk@webmail.sic.rm.cnr.it>
Date: Wed, 21 Feb 2007 16:22:08 +0100
From: Andrea Preite Martinez <andrea.preitemartinez@iasf-roma.inaf.it>
To: semantics@ivoa.net
Subject: WD-Ontology
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Reply-To: Andrea Preite Martinez <andrea.preitemartinez@iasf-roma.inaf.it>

A Working Draft on

Ontology of Astronomical Object Types, version 1.0

has been uploaded in the Document section of IVOA
http://ivoa.net/Documents/latest/AstrObjectOntology.html

and in the Semantics WG twiki page
http://www.ivoa.net/twiki/bin/view/IVOA/IvoaSemantics  .

In this page you can also find the ontology file (.owl) that can be
explored/edited with the protégé browser/editor
http://protege.stanford.edu/overview/protege-owl.html .

The document and the Ontology are open to discussion and contributions.

Note that the ontology is made of "defined" concepts, and only a fraction
of them has been defined, for the moment only in terms of components and/or
morphology and/or processes.
Indeed, there are still 87 astronomical concepts that are missing an  
NS-condition (Necessary&Sufficient)

I then ask for the contribution of the members of the WG and of the scientific
community to help finding the necessary and/or sufficient conditions  
to define the concepts.
What is needed is a complete but concise description in plain text of  
the concepts in terms of components/ morphology / physical processes /  
observational properties and/or ...

An example:
CataclysmicVariable: close binary, components WD/subGiant and LateType Star,
variability due to thermonuclear processes...

The concepts without NS-conditions (but sometimes already with N or S  
conditions) are the following:

AssociationOfStars
ClusterOfGalaxies
SuperClusterOfGalaxies
ClusterOfStars
GlobularCluster
OpenCluster
GalaxiesGroup
Galaxy
ActiveGalaxyNucleus
Blazar
BLLacObject
OpticallyViolentlyVariableObject
LINERTypeActiveGalaxyNucleus
SeyfertGalaxy
Seyfert1Galaxy
Seyfert2Galaxy
BlueCompactGalaxy
EmissionLineGalaxy
HighRedshiftGalaxy
HIIGalaxy
LowSurfaceBrightnessGalaxy
QuasiStellarObject
StarburstGalaxy
SpectroscopicBinary
XRayBinary
InterStellarMedium
EmissionNebula
HIRegion
HIRegionCold
HIRegionWarm
MolecularCloud
BokGlobule
DarkCloud
ReflexionNebula
StellarObject
BrownDwarf
Star
PostAsymptoticGiantBranchStar
RedGiant
AsymptoticGiantBranchStar
CarbonStar
OHIREnvelopeTypeStar
STypeStar
RVTauri
PeculiarStar
CHEnvelopeTypeStar
BeStar
WolfRayetStar
HorizontalBranchStar
StellarRemnant
NeutronStar
Pulsar
AccretionPoweredPulsar
Magnetar
RotationPoweredPulsar
StellarBlackHole
WhiteDwarf
YoungStellarObject
PreMainSequenceStar
HerbigHaro
TTauri
ClassicalTTauri
WeakLineTTauri
ProtoStar
SubStellarObject
BrownDwarf
NonStellarBody
Asteroid
Comet
Planet
CataclysmicVariable
DQHerCataclysmicVariable
DwarfNova
Nova
NovaLikeObject
RapidIrregularVariableStar
IrregularVariableStar
RapidIrregularVariableStar
BetaCepheid
LTypeIrregularStar
MiraCeti
SemiRegularPulsatingStar
RRLyrae
WVir
BYDraconis
EllipsoidalVariableStar
SymbioticStar


P.S.:
I think we can envisage a half-session in the spring IVOA meeting in  
Beijin dedicated to the ontology and its applications.

Andrea

===================================================================================
Andrea Preite Martinez                 andrea.preitemartinez@iasf-roma.inaf.it
IASF                                   Tel.IASF:+39.06.4993.4641
Via del Fosso del Cavaliere 100        Tel.CDS :+33.3.90242452
I-00133 Roma                           Cell.1  :+39.320.43.15.383
                                        Cell.2  :+39.
===================================================================================



From owner-semantics@eso.org  Wed Feb 21 21:15:58 2007
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Andrea Preite Martinez wrote:
> A Working Draft on
> 
> Ontology of Astronomical Object Types, version 1.0
> 
> has been uploaded in the Document section of IVOA
> http://ivoa.net/Documents/latest/AstrObjectOntology.html
> 
> and in the Semantics WG twiki page
> http://www.ivoa.net/twiki/bin/view/IVOA/IvoaSemantics  .
> 
> In this page you can also find the ontology file (.owl) that can be
> explored/edited with the protégé browser/editor
> http://protege.stanford.edu/overview/protege-owl.html .
> 
> The document and the Ontology are open to discussion and contributions.
> 
> Note that the ontology is made of "defined" concepts, and only a fraction
> of them has been defined, for the moment only in terms of components and/or
> morphology and/or processes.
> Indeed, there are still 87 astronomical concepts that are missing an 
> NS-condition (Necessary&Sufficient)
> 
> I then ask for the contribution of the members of the WG and of the 
> scientific
> community to help finding the necessary and/or sufficient conditions to 
> define the concepts.
> What is needed is a complete but concise description in plain text of 
> the concepts in terms of components/ morphology / physical processes / 
> observational properties and/or ...
> 
> An example:
> CataclysmicVariable: close binary, components WD/subGiant and LateType 
> Star,
> variability due to thermonuclear processes...
> 
> The concepts without NS-conditions (but sometimes already with N or S 
> conditions) are the following:
There are dangers in defining the necessary and sufficient conditions, 
particularly if one requires too many necessaries.  You can end up with 
things that are not in any class although they are so close to one that 
ordinarily one would include them.  For instance, what if it is like a 
cataclysmicVariable but not quite a LateType star. One also run into 
whether or not to use strictly observational qualities or interpreted 
qualities.  As in, what if it erupts and has emissions like a 
cataclysmic variable but it is too far away to discern the individual 
components?  Can you still call it a CV?

On the other hand, if we don't make clear and distinct boundaries you 
are left with a system that is too fuzzy to do any good.

Having noted these difficulties, in the grand tradition of semantics, we 
simply push forward and appreciate that we can always pull back on some 
of these  NS qualities or define both strict and loose versions of each 
class, as in StandardCalaclysmicVariable/TentativeCataclysmicVariable.
> 
> AssociationOfStars - alias (equivalent class)  StellarAssociation 
Loose concentration of young stars (how loose? 1-100 per cubic pc?), but 
may contain 1 or more StellarClusters within it.
subclasses -
	OB-Association - association with many O and B stars (massive stars)
	R-Association - contains medium mass stars with reflection nebulae
	T-Association - contains only low mass stars including some T-Tauri stars

> ClusterOfGalaxies - alias GalaxyCluster
Observationally - a region with a concentration of galaxies several 
times the neighboring background density with similar galaxy redshifts.
Theoretically - a collapsed and virialized system of galaxies
subclasses
	AbellCluster - there are two definitions here
		a) A cluster in the Abell Catalog
		b) A cluster with the criteria given by Abell for his catalog
	Perhaps a) should be called an AbellCatalogCluster

> SuperClusterOfGalaxies 
	A 3-d region of contiguous overdensity on Mpc scales.  Usually these 
contain several clusters, but this should not be the definition becuase 
a) the Local Supercluster contains only 1 cluster b) if one found a 
large contiguous overdensity without a cluster you probably would still 
want to classify it as a supercluster.

> ClusterOfStars - alias StarCluster.  
Observational - A tight system of stars with less than 10^9 stars.
Theoretical - A system of stars formed out of a single cloud of gas and 
with less mass than a galaxy (that is, .

> GlobularCluster - 
A roughly spherical ClusterOfStars with 10^4 - 10^9 stars and with an 
orbit that takes it out of the plane of its parent galaxy.
[Normally the definition would include the idea that it is composed of 
old stars, but blue globular clusters in N1375 and other galaxies show 
that there are exceptions.  Also, when globular clusters were young they 
had young stars and they were still globular clusters.]

> OpenCluster - alias GalacticCluster
ClusterOfStars with young stars and with center of mass orbit that stays 
in the plane.

> GalaxiesGroup 
This should be GalaxyGroup - alias GroupOfGalaxies.
A system with on the order of 10 galaxies separated by 10-100 galaxy 
diameters [Hopkins, J. 1976 Glossary of Astronomy and Astrophysics]

I stop here to rest and wait for comments.
Ed
> Galaxy
> ActiveGalaxyNucleus
> Blazar
> BLLacObject
> OpticallyViolentlyVariableObject
> LINERTypeActiveGalaxyNucleus
> SeyfertGalaxy
> Seyfert1Galaxy
> Seyfert2Galaxy
> BlueCompactGalaxy
> EmissionLineGalaxy
> HighRedshiftGalaxy
> HIIGalaxy
> LowSurfaceBrightnessGalaxy
> QuasiStellarObject
> StarburstGalaxy
> SpectroscopicBinary
> XRayBinary
> InterStellarMedium
> EmissionNebula
> HIRegion
> HIRegionCold
> HIRegionWarm
> MolecularCloud
> BokGlobule
> DarkCloud
> ReflexionNebula
> StellarObject
> BrownDwarf
> Star
> PostAsymptoticGiantBranchStar
> RedGiant
> AsymptoticGiantBranchStar
> CarbonStar
> OHIREnvelopeTypeStar
> STypeStar
> RVTauri
> PeculiarStar
> CHEnvelopeTypeStar
> BeStar
> WolfRayetStar
> HorizontalBranchStar
> StellarRemnant
> NeutronStar
> Pulsar
> AccretionPoweredPulsar
> Magnetar
> RotationPoweredPulsar
> StellarBlackHole
> WhiteDwarf
> YoungStellarObject
> PreMainSequenceStar
> HerbigHaro
> TTauri
> ClassicalTTauri
> WeakLineTTauri
> ProtoStar
> SubStellarObject
> BrownDwarf
> NonStellarBody
> Asteroid
> Comet
> Planet
> CataclysmicVariable
> DQHerCataclysmicVariable
> DwarfNova
> Nova
> NovaLikeObject
> RapidIrregularVariableStar
> IrregularVariableStar
> RapidIrregularVariableStar
> BetaCepheid
> LTypeIrregularStar
> MiraCeti
> SemiRegularPulsatingStar
> RRLyrae
> WVir
> BYDraconis
> EllipsoidalVariableStar
> SymbioticStar
> 
> 
> P.S.:
> I think we can envisage a half-session in the spring IVOA meeting in 
> Beijin dedicated to the ontology and its applications.
> 
> Andrea
> 
> =================================================================================== 
> 
> Andrea Preite Martinez                 
> andrea.preitemartinez@iasf-roma.inaf.it
> IASF                                   Tel.IASF:+39.06.4993.4641
> Via del Fosso del Cavaliere 100        Tel.CDS :+33.3.90242452
> I-00133 Roma                           Cell.1  :+39.320.43.15.383
>                                        Cell.2  :+39.
> =================================================================================== 
> 
> 
> 
> 

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From owner-semantics@eso.org  Fri Feb 23 13:25:11 2007
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From: "Tony Linde" <Tony.Linde@leicester.ac.uk>
To: <semantics@ivoa.net>
References: <20070221162208.3kfmmx1swk4kowgk@webmail.sic.rm.cnr.it> <45DCA85C.20803@umd.edu>
Subject: RE: WD-Ontology
Date: Fri, 23 Feb 2007 12:24:21 -0000
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Reply-To: "Tony Linde" <Tony.Linde@leicester.ac.uk>

> ordinarily one would include them.  For instance, what if it 
> is like a 
> cataclysmicVariable but not quite a LateType star. 

Is this not where relations come into play: you could define relations such
as 'like a' and 'not quite a' and then, depending on what you want to do,
manipulate the objects and relations in your code. 

> whether or not to use strictly observational qualities or interpreted 
> qualities.  As in, what if it erupts and has emissions like a 

And this is where the uniqueness of astronomy comes into play and we start
to build intelligent *astronomy* applications rather than generic
information handling apps.

T.

> -----Original Message-----
> From: owner-semantics@eso.org 
> [mailto:owner-semantics@eso.org] On Behalf Of Ed Shaya
> Sent: 21 February 2007 20:15
> To: Andrea Preite Martinez
> Cc: semantics@ivoa.net
> Subject: Re: WD-Ontology
> 
> 
> 
> Andrea Preite Martinez wrote:
> > A Working Draft on
> > 
> > Ontology of Astronomical Object Types, version 1.0
> > 
> > has been uploaded in the Document section of IVOA
> > http://ivoa.net/Documents/latest/AstrObjectOntology.html
> > 
> > and in the Semantics WG twiki page
> > http://www.ivoa.net/twiki/bin/view/IVOA/IvoaSemantics  .
> > 
> > In this page you can also find the ontology file (.owl) that can be
> > explored/edited with the protégé browser/editor
> > http://protege.stanford.edu/overview/protege-owl.html .
> > 
> > The document and the Ontology are open to discussion and 
> contributions.
> > 
> > Note that the ontology is made of "defined" concepts, and 
> only a fraction
> > of them has been defined, for the moment only in terms of 
> components and/or
> > morphology and/or processes.
> > Indeed, there are still 87 astronomical concepts that are 
> missing an 
> > NS-condition (Necessary&Sufficient)
> > 
> > I then ask for the contribution of the members of the WG and of the 
> > scientific
> > community to help finding the necessary and/or sufficient 
> conditions to 
> > define the concepts.
> > What is needed is a complete but concise description in 
> plain text of 
> > the concepts in terms of components/ morphology / physical 
> processes / 
> > observational properties and/or ...
> > 
> > An example:
> > CataclysmicVariable: close binary, components WD/subGiant 
> and LateType 
> > Star,
> > variability due to thermonuclear processes...
> > 
> > The concepts without NS-conditions (but sometimes already 
> with N or S 
> > conditions) are the following:
> There are dangers in defining the necessary and sufficient 
> conditions, 
> particularly if one requires too many necessaries.  You can 
> end up with 
> things that are not in any class although they are so close 
> to one that 
> ordinarily one would include them.  For instance, what if it 
> is like a 
> cataclysmicVariable but not quite a LateType star. One also run into 
> whether or not to use strictly observational qualities or interpreted 
> qualities.  As in, what if it erupts and has emissions like a 
> cataclysmic variable but it is too far away to discern the individual 
> components?  Can you still call it a CV?
> 
> On the other hand, if we don't make clear and distinct boundaries you 
> are left with a system that is too fuzzy to do any good.
> 
> Having noted these difficulties, in the grand tradition of 
> semantics, we 
> simply push forward and appreciate that we can always pull 
> back on some 
> of these  NS qualities or define both strict and loose 
> versions of each 
> class, as in StandardCalaclysmicVariable/TentativeCataclysmicVariable.
> > 
> > AssociationOfStars - alias (equivalent class)  StellarAssociation 
> Loose concentration of young stars (how loose? 1-100 per 
> cubic pc?), but 
> may contain 1 or more StellarClusters within it.
> subclasses -
> 	OB-Association - association with many O and B stars 
> (massive stars)
> 	R-Association - contains medium mass stars with 
> reflection nebulae
> 	T-Association - contains only low mass stars including 
> some T-Tauri stars
> 
> > ClusterOfGalaxies - alias GalaxyCluster
> Observationally - a region with a concentration of galaxies several 
> times the neighboring background density with similar galaxy 
> redshifts.
> Theoretically - a collapsed and virialized system of galaxies
> subclasses
> 	AbellCluster - there are two definitions here
> 		a) A cluster in the Abell Catalog
> 		b) A cluster with the criteria given by Abell 
> for his catalog
> 	Perhaps a) should be called an AbellCatalogCluster
> 
> > SuperClusterOfGalaxies 
> 	A 3-d region of contiguous overdensity on Mpc scales.  
> Usually these 
> contain several clusters, but this should not be the 
> definition becuase 
> a) the Local Supercluster contains only 1 cluster b) if one found a 
> large contiguous overdensity without a cluster you probably 
> would still 
> want to classify it as a supercluster.
> 
> > ClusterOfStars - alias StarCluster.  
> Observational - A tight system of stars with less than 10^9 stars.
> Theoretical - A system of stars formed out of a single cloud 
> of gas and 
> with less mass than a galaxy (that is, .
> 
> > GlobularCluster - 
> A roughly spherical ClusterOfStars with 10^4 - 10^9 stars and with an 
> orbit that takes it out of the plane of its parent galaxy.
> [Normally the definition would include the idea that it is 
> composed of 
> old stars, but blue globular clusters in N1375 and other 
> galaxies show 
> that there are exceptions.  Also, when globular clusters were 
> young they 
> had young stars and they were still globular clusters.]
> 
> > OpenCluster - alias GalacticCluster
> ClusterOfStars with young stars and with center of mass orbit 
> that stays 
> in the plane.
> 
> > GalaxiesGroup 
> This should be GalaxyGroup - alias GroupOfGalaxies.
> A system with on the order of 10 galaxies separated by 10-100 galaxy 
> diameters [Hopkins, J. 1976 Glossary of Astronomy and Astrophysics]
> 
> I stop here to rest and wait for comments.
> Ed
> > Galaxy
> > ActiveGalaxyNucleus
> > Blazar
> > BLLacObject
> > OpticallyViolentlyVariableObject
> > LINERTypeActiveGalaxyNucleus
> > SeyfertGalaxy
> > Seyfert1Galaxy
> > Seyfert2Galaxy
> > BlueCompactGalaxy
> > EmissionLineGalaxy
> > HighRedshiftGalaxy
> > HIIGalaxy
> > LowSurfaceBrightnessGalaxy
> > QuasiStellarObject
> > StarburstGalaxy
> > SpectroscopicBinary
> > XRayBinary
> > InterStellarMedium
> > EmissionNebula
> > HIRegion
> > HIRegionCold
> > HIRegionWarm
> > MolecularCloud
> > BokGlobule
> > DarkCloud
> > ReflexionNebula
> > StellarObject
> > BrownDwarf
> > Star
> > PostAsymptoticGiantBranchStar
> > RedGiant
> > AsymptoticGiantBranchStar
> > CarbonStar
> > OHIREnvelopeTypeStar
> > STypeStar
> > RVTauri
> > PeculiarStar
> > CHEnvelopeTypeStar
> > BeStar
> > WolfRayetStar
> > HorizontalBranchStar
> > StellarRemnant
> > NeutronStar
> > Pulsar
> > AccretionPoweredPulsar
> > Magnetar
> > RotationPoweredPulsar
> > StellarBlackHole
> > WhiteDwarf
> > YoungStellarObject
> > PreMainSequenceStar
> > HerbigHaro
> > TTauri
> > ClassicalTTauri
> > WeakLineTTauri
> > ProtoStar
> > SubStellarObject
> > BrownDwarf
> > NonStellarBody
> > Asteroid
> > Comet
> > Planet
> > CataclysmicVariable
> > DQHerCataclysmicVariable
> > DwarfNova
> > Nova
> > NovaLikeObject
> > RapidIrregularVariableStar
> > IrregularVariableStar
> > RapidIrregularVariableStar
> > BetaCepheid
> > LTypeIrregularStar
> > MiraCeti
> > SemiRegularPulsatingStar
> > RRLyrae
> > WVir
> > BYDraconis
> > EllipsoidalVariableStar
> > SymbioticStar
> > 
> > 
> > P.S.:
> > I think we can envisage a half-session in the spring IVOA 
> meeting in 
> > Beijin dedicated to the ontology and its applications.
> > 
> > Andrea
> > 
> > 
> ==============================================================
> ===================== 
> > 
> > Andrea Preite Martinez                 
> > andrea.preitemartinez@iasf-roma.inaf.it
> > IASF                                   Tel.IASF:+39.06.4993.4641
> > Via del Fosso del Cavaliere 100        Tel.CDS :+33.3.90242452
> > I-00133 Roma                           Cell.1  :+39.320.43.15.383
> >                                        Cell.2  :+39.
> > 
> ==============================================================
> ===================== 
> > 
> > 
> > 
> > 
> 


From owner-semantics@eso.org  Fri Feb 23 17:37:32 2007
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From: Ed Shaya <eshaya@umd.edu>
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Tony Linde wrote:
>> ordinarily one would include them.  For instance, what if it 
>> is like a 
>> cataclysmicVariable but not quite a LateType star. 
> 
> Is this not where relations come into play: you could define relations such
> as 'like a' and 'not quite a' and then, depending on what you want to do,
> manipulate the objects and relations in your code. 

Yes, that would work.  You could allow AstroObject to have a property
"likeA" or "nearly" which would allow one to toss objects into an 
anonymous class of (F-star, nearly, CataclysmicVariable).  I guess this 
is better because you don't create as many named classes, but it has 
basically the same functionally as a NearlyCataclysmicVariable.  If 
later on we wish to include F-stars as CVs, it would be easy to refactor 
the ontology.

>> whether or not to use strictly observational qualities or interpreted 
>> qualities.  As in, what if it erupts and has emissions like a 
> 
> And this is where the uniqueness of astronomy comes into play and we start
> to build intelligent *astronomy* applications rather than generic
> information handling apps.

Agreed.  Although I don't think that astronomy is somehow unique.  Other 
fields could benefit from the same thing.  But, I agree with the gist 
here that one can create very interesting applications, like one that 
automatically classifies objects by observational quantities and then 
attaches physical attributes/interpretations into what the objects are.

So, is everyone fine with the set of definitions that I put forth? 
Speak now, because the next step would be to rephrase these into OWL 
triples and make them part of the class' Necessary and Sufficient 
statements.  For example, if one claims an object is a GalaxyCluster, 
then it would Necessarily be a virialized system because that is in the 
definition.

Ed
> 
> T.
> 
>> -----Original Message-----
>> From: owner-semantics@eso.org 
>> [mailto:owner-semantics@eso.org] On Behalf Of Ed Shaya
>> Sent: 21 February 2007 20:15
>> To: Andrea Preite Martinez
>> Cc: semantics@ivoa.net
>> Subject: Re: WD-Ontology
>>
>>
>>
>> Andrea Preite Martinez wrote:
>>> A Working Draft on
>>>
>>> Ontology of Astronomical Object Types, version 1.0
>>>
>>> has been uploaded in the Document section of IVOA
>>> http://ivoa.net/Documents/latest/AstrObjectOntology.html
>>>
>>> and in the Semantics WG twiki page
>>> http://www.ivoa.net/twiki/bin/view/IVOA/IvoaSemantics  .
>>>
>>> In this page you can also find the ontology file (.owl) that can be
>>> explored/edited with the protégé browser/editor
>>> http://protege.stanford.edu/overview/protege-owl.html .
>>>
>>> The document and the Ontology are open to discussion and 
>> contributions.
>>> Note that the ontology is made of "defined" concepts, and 
>> only a fraction
>>> of them has been defined, for the moment only in terms of 
>> components and/or
>>> morphology and/or processes.
>>> Indeed, there are still 87 astronomical concepts that are 
>> missing an 
>>> NS-condition (Necessary&Sufficient)
>>>
>>> I then ask for the contribution of the members of the WG and of the 
>>> scientific
>>> community to help finding the necessary and/or sufficient 
>> conditions to 
>>> define the concepts.
>>> What is needed is a complete but concise description in 
>> plain text of 
>>> the concepts in terms of components/ morphology / physical 
>> processes / 
>>> observational properties and/or ...
>>>
>>> An example:
>>> CataclysmicVariable: close binary, components WD/subGiant 
>> and LateType 
>>> Star,
>>> variability due to thermonuclear processes...
>>>
>>> The concepts without NS-conditions (but sometimes already 
>> with N or S 
>>> conditions) are the following:
>> There are dangers in defining the necessary and sufficient 
>> conditions, 
>> particularly if one requires too many necessaries.  You can 
>> end up with 
>> things that are not in any class although they are so close 
>> to one that 
>> ordinarily one would include them.  For instance, what if it 
>> is like a 
>> cataclysmicVariable but not quite a LateType star. One also run into 
>> whether or not to use strictly observational qualities or interpreted 
>> qualities.  As in, what if it erupts and has emissions like a 
>> cataclysmic variable but it is too far away to discern the individual 
>> components?  Can you still call it a CV?
>>
>> On the other hand, if we don't make clear and distinct boundaries you 
>> are left with a system that is too fuzzy to do any good.
>>
>> Having noted these difficulties, in the grand tradition of 
>> semantics, we 
>> simply push forward and appreciate that we can always pull 
>> back on some 
>> of these  NS qualities or define both strict and loose 
>> versions of each 
>> class, as in StandardCalaclysmicVariable/TentativeCataclysmicVariable.
>>> AssociationOfStars - alias (equivalent class)  StellarAssociation 
>> Loose concentration of young stars (how loose? 1-100 per 
>> cu
