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From: "Tony Linde" <ael@star.le.ac.uk>
To: "Registry_Ivoa_List" <registry@ivoa.net>
Subject: Registry WG
Date: Sat, 18 Jan 2003 12:08:24 -0000
Organization: University of Leicester
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At the last IVOA meeting I volunteered to initiate input to this mailing
list and set up a working group. This area is seen as having the highest
priority within the IVOA community and we have been tasked with
delivering a V1.0 specification by the end of 2003 for acceptance by the
IVOA executive at its January 2004 meeting.

Something which was discussed at the IVOA meeting but not made a formal
goal was the possibility of having some sort of inter-VO registry
demonstration operating at the IAU in Sydney in July. We need to decide
fairly quickly if this is possible and, if so, what form it should take.

EVERYONE who subscribes to this mailing list will have an opportunity to
contribute to the registry specification and to comment on drafts of
that specification. But we would like to have a smaller working group of
people who are willing and able to spend a reasonable amount of their
working time on this area. Such people would probably need to be
full-time members of an existing VO project.

I'm not sure whether we should simply call for volunteers to the working
group (WG) or mandate the three core VO projects (US-VO, Euro-VO,
AstroGrid) to supply one or two people each while offering other VO
projects the opportunity to add one of their own members to the group.

The WG tasks in the short term are:

1. set the scope of the WG and the registry specification
2. decide feasibility of IAU demo
2.1 if feasible, what form demo should take
3. set the contents of a registry spec (ie which standards it covers)
4. investigate and report on other registry initiatives (OAI, GGF etc)
5. define format of specification
6. set rules for how WG operates (eg copy GGF:
http://www.globalgridforum.org/L_About/Struc_Proc.htm)

Any other suggestions?

We should make this list the main means of communication by the WG (so
others can also contribute to discussions) and I'll also line up some
space on an IVOA machine for storing/downloading documents etc. We could
also set up regular telecons and I think face-to-face meetings every 2
or 3 months would also be advisable.

What does everyone think?

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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From: "Tony Linde" <ael@star.le.ac.uk>
To: "Registry_Ivoa_List" <registry@ivoa.net>
Subject: Registry wiki pages
Date: Fri, 24 Jan 2003 10:40:08 -0000
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To (hopefully) make it easier to discuss the structure of the Registry
set of standards, I have created a number of starter pages on the
astrogrid-hosted IVOA wiki site:
  http://wiki.astrogrid.org/bin/view/IVOA/ResourceRegistry

I have modelled the pages on the W3C approach, especially that of the
Semantic Web area. I have listed an initial set of specifications which
we might consider as those required for the Registry area:

    * RegistryMetadata
    * ResourceMetadata
    * RegistryQuery
    * RegistryResponse
    * ResourceIdentifier
    * ResourceHierarchy
    * RegistryLocation
    * RegistrySynchronisation
    * RegistryExtension

This may be far more than we want to tackle, in which case we need to
define which ones we do want to work on.

Anyway, take a look at the pages and let's get the discussion going. 


Feel free to add your own suggestions to the wiki pages. To do so, you
only need to register at:
  http://wiki.astrogrid.org/bin/view/TWiki/TWikiRegistration

If you are unsure how to use the wiki, look at:
  http://wiki.astrogrid.org/bin/view/TWiki/WelcomeGuest
or do the quick tutorial:
  http://wiki.astrogrid.org/bin/view/TWiki/TWikiTutorial

The syntax and shorthand for creating wiki pages are at:
  http://wiki.astrogrid.org/bin/view/TWiki/WikiSyntax
  http://wiki.astrogrid.org/bin/view/TWiki/TWikiShorthand
but you can also use basic HTML (the bits between <body> and </body> in
an html page).


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 Jan 27 11:58:53 2003
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From: "Roy Williams" <roy@cacr.caltech.edu>
To: <metadata@us-vo.org>, <registry@ivoa.net>
Subject: OAI for Virtual Observatory
Date: Sun, 26 Jan 2003 08:19:34 -0800
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Open Archives Protocol and the Virtual Observatory

This note is a summary of my experience of the OAI protocol. It looks
to be simple, flexible, and extensible, and all expressed in simple
XML. I would like to team up with some others in the project who would
like to use OAI tools in a practical project, perhaps as a registry
for the Cone Search and SIAP implementtions, perhaps as a new face for
Vizier .... or another protoype project?

Roy
-------------------------------------------------------

The OAI protocol is described in
http://www.openarchives.org/OAI/openarchivesprotocol.html.
The protocol is used to describe collections of digital resources, and
there is a large number of servers of this protocol available from the
Repository Explorer from Virginia Tech, you can explore it at
http://oai.dlib.vt.edu/cgi-bin/Explorer/oai2.0/testoai
This is the tool that I have used to try to understand what OAI-PMH
actually does.

The protocol handles metadata bundles that can refer to arbitrary
entities. Each metadata bundle includes a header, with an identifier
that can be used to refer to it, as well as a date stamp. Identifiers
can be built in may ways, but most practitioners have chosen a
hierarchical scheme of some sort. Here is an example from a math
server at Cornell called Project Euclid:
oai:CULeuclid:euclid.em/999188417

Examples of metadata bundles from the Repository Explorer include
journal articles, museum artifacts, classical Greek texts, and lost
languages. The metadata bundle is an abstract concept, that can be
"viewed" in different ways, each expressed by a "Metadata Format" (MF)
which we can think of as a "point of view" on the metadata, and a
corresponding query mechanism. Each MF is expressed by an XML Schema,
so that a metadata record is always an instance of one of the schema
that the repository supports. The most ubiquitous MF is the Dublin
Core, with 15 keywords -- Title, Creator, Subject, Description,
Publisher, etc.

In the Virtual Observatory, we could imagine some MFs to represent
information about astronomical datasets:

(1) One might express the provenance of the dataset, the organization
that funded it, the responsible parties in the data reduction,
authentication requirements, and so on.

(2) A different point of view of a dataset would express a MF about
sky coverage, wavelength, and pixel scale. Querying this would enable
the "Gamma-Ray Burst" demo, which entails getting information about a
point in the sky.

(3) A third MF could be for those who store and replicate datasets.
The metadata record would concern the size and granularity of the
dataset, the nature of the services that provide it, and the replicas
of that data.

The purpose of the OAI protocol is to expose metadata through queries,
with the result in any of the MFs that have been implemented. There
are six "verbs" in the protocol as follows. Below I illustrate the
verbs with the Project Euclid repository of math e-journals. The given
links produce the XML output directly, however you can see all the
same information in human-readable form with the Repository Explorer.

** Identity
Each repository has an "identity" record, with basic information such
as Name, URL, administrators email, and other information. Try for
example
http://ProjectEuclid.org/Dienst?verb=Identity

** List Metadata Formats
This verb brings an XML-encoded list of the MFs that can be delivered
from this repository. In Project Euclid, there are two MFs, Dublin
Core and another for more precise bibliographic information -- it has
28 keywords, including copyright, funding, number of pages, etc etc.
Each MF has an identifier, for example Dubling Core is "oai_dc".
http://ProjectEuclid.org/Dienst?verb=ListMetadataFormats

** List Sets
Each repository is assumed to hold the metadata for several "sets", or
metadata directed to coherent collections of entities. For example, I
have looked at the Project Euclid OAI server, which hosts mathematical
online journals. The sets that it hosts include "Annals of
Mathematics", "Experimental Mathematics", and the "Journal of Applied
Probability". Thus each OAI "set" is a journal, and in the "set" are
the metadata for the corresponding journal articles. Each set has an
identifier, for example "Experimental Mathematics" is identified as
"em".
http://ProjectEuclid.org/Dienst?verb=ListSets

** List Identifiers
This verb requires a parameter which is one of the sets, and it
returns the identifiers in the set. The following request returns all
the metadata identifiers from the Experimental Math Journal (em) in
the Dublin Core format (oai_dc).
http://ProjectEuclid.org/Dienst?verb=ListIdentifiers&metadataPrefix=oa
i_dc&set=em

** List Records
Same as List Identifiers, but returns all the full metadata records,
rather than just identifiers.
http://ProjectEuclid.org/Dienst?verb=ListRecords&metadataPrefix=oai_dc
&set=em

** Get Record
Takes an identifier of a metadata bundle, and a requested Metadata
Format, and returns the metadata rendered in the appropriate format.
http://projecteuclid.org/Dienst?verb=GetRecord&metadataPrefix=oai_dc&i
dentifier=OAI:CULeuclid:euclid.em/999188417

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

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From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: RE: Registry wiki pages
Date: Sat, 25 Jan 2003 11:04:26 -0000
Organization: University of Leicester
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After posting the following, I was informed that an IVOA wiki is under
construction. Marco is still working out some bugs in it but I have
transferred all the pages hosted at the astrogrid wiki to this one.

The pages start from the interoperability page:
  http://www.ivoa.net/twiki/bin/view/IVOA/IvoaInteroperability

With the registry pages starting at:
  http://www.ivoa.net/twiki/bin/view/IVOA/IvoaRegistry

Please use this site if you want to make changes, add pages etc. The
tool used is the same as for AstroGrid (TWiki) so you don't need to
learn a new shorthand. You can register on this site at:
  http://www.ivoa.net/twiki/bin/view/TWiki/TWikiRegistration

The site is fairly flaky using IE so I would advise you to use the
latest release (1.2.1) of Mozilla (http://www.mozilla.org).

Cheers,
Tony. 

> -----Original Message-----
> From: Tony Linde [mailto:ael@star.le.ac.uk] 
> Sent: 24 January 2003 10:40
> To: Registry_Ivoa_List
> Subject: Registry wiki pages
> 
> 
> To (hopefully) make it easier to discuss the structure of the 
> Registry set of standards, I have created a number of starter 
> pages on the astrogrid-hosted IVOA wiki site:
>   http://wiki.astrogrid.org/bin/view/IVOA/ResourceRegistry
> 
> I have modelled the pages on the W3C approach, especially 
> that of the Semantic Web area. I have listed an initial set 
> of specifications which we might consider as those required 
> for the Registry area:
> 
>     * RegistryMetadata
>     * ResourceMetadata
>     * RegistryQuery
>     * RegistryResponse
>     * ResourceIdentifier
>     * ResourceHierarchy
>     * RegistryLocation
>     * RegistrySynchronisation
>     * RegistryExtension
> 
> This may be far more than we want to tackle, in which case we 
> need to define which ones we do want to work on.
> 
> Anyway, take a look at the pages and let's get the discussion going. 
> 
> 
> Feel free to add your own suggestions to the wiki pages. To 
> do so, you only need to register at:
>   http://wiki.astrogrid.org/bin/view/TWiki/TWikiRegistration
> 
> If you are unsure how to use the wiki, look at:
>   http://wiki.astrogrid.org/bin/view/TWiki/WelcomeGuest
> or do the quick tutorial:
>   http://wiki.astrogrid.org/bin/view/TWiki/TWikiTutorial
> 
> The syntax and shorthand for creating wiki pages are at:
>   http://wiki.astrogrid.org/bin/view/TWiki/WikiSyntax
>   http://wiki.astrogrid.org/bin/view/TWiki/TWikiShorthand
> but you can also use basic HTML (the bits between <body> and 
> </body> in an html page).
> 
> 
> 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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This is a pointer to Bob Hanish's document on 'Resource and Service
Metadata for the Virtual Observatory' posted on the US-VO web site:
http://us-vo.org/publications.html. This will be updated when he has the
minutes of the October interop meeting but I thought it worth posting
anyway.

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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From - Mon Jan 27 15:47:47 2003
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Date: Mon, 27 Jan 2003 15:47:30 +0100
From: Markus Dolensky <Markus.Dolensky@eso.org>
Organization: European Southern Observatory
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Hi Tony,

The mail archive has been updated.

Nothing was broken though:
In the past few days the manual step of actually moving messages to the 
location where the archive program can pick them up was simply not 
performed. For various reasons this process is not fully automatic at 
the moment. Sorry for the delay.

Markus

+---
| Markus Dolensky   Mailto:Markus.Dolensky@eso.org
| AVO Senior System Engineer  Web: www.euro-vo.org
| Voice: ++49 89 32006/261  Fax: ++49 89 32006/480
+---


Tony Linde wrote:
> The archive for this forum seems broken - only the first message is
> listed. I've dumped the current messages in the forum (from Outlook to
> pdf) to:
> 
>  
> http://www.ivoa.net/internal/IVOA/IvoaResReg/archive-20030127-1409GMT.PD
> F
> 
> Cheers,
> Tony. 




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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: "Registry_Ivoa_List" <registry@ivoa.net>
Subject: dump
Date: Mon, 27 Jan 2003 14:19:52 -0000
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The archive for this forum seems broken - only the first message is
listed. I've dumped the current messages in the forum (from Outlook to
pdf) to:

 
http://www.ivoa.net/internal/IVOA/IvoaResReg/archive-20030127-1409GMT.PD
F

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 Jan 27 16:39:50 2003
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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: RE: Registry wiki pages
Date: Mon, 27 Jan 2003 15:35:30 -0000
Organization: University of Leicester
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Status:   

The root page has been moved yet again - seems I missed a page that
Marco had created, so take a look at:

  http://www.ivoa.net/twiki/bin/view/IVOA/IvoaResReg

Cheers,
Tony. 

> -----Original Message-----
> From: Tony Linde [mailto:ael@star.le.ac.uk] 
> Sent: 24 January 2003 10:40
> To: Registry_Ivoa_List
> Subject: Registry wiki pages
> 
> 
> To (hopefully) make it easier to discuss the structure of the 
> Registry set of standards, I have created a number of starter 
> pages on the astrogrid-hosted IVOA wiki site:
>   http://wiki.astrogrid.org/bin/view/IVOA/ResourceRegistry
> 
> I have modelled the pages on the W3C approach, especially 
> that of the Semantic Web area. I have listed an initial set 
> of specifications which we might consider as those required 
> for the Registry area:
> 
>     * RegistryMetadata
>     * ResourceMetadata
>     * RegistryQuery
>     * RegistryResponse
>     * ResourceIdentifier
>     * ResourceHierarchy
>     * RegistryLocation
>     * RegistrySynchronisation
>     * RegistryExtension
> 
> This may be far more than we want to tackle, in which case we 
> need to define which ones we do want to work on.
> 
> Anyway, take a look at the pages and let's get the discussion going. 
> 
> 
> Feel free to add your own suggestions to the wiki pages. To 
> do so, you only need to register at:
>   http://wiki.astrogrid.org/bin/view/TWiki/TWikiRegistration
> 
> If you are unsure how to use the wiki, look at:
>   http://wiki.astrogrid.org/bin/view/TWiki/WelcomeGuest
> or do the quick tutorial:
>   http://wiki.astrogrid.org/bin/view/TWiki/TWikiTutorial
> 
> The syntax and shorthand for creating wiki pages are at:
>   http://wiki.astrogrid.org/bin/view/TWiki/WikiSyntax
>   http://wiki.astrogrid.org/bin/view/TWiki/TWikiShorthand
> but you can also use basic HTML (the bits between <body> and 
> </body> in an html page).
> 
> 
> 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 Jan 29 21:43:23 2003
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Date: Wed, 29 Jan 2003 13:41:29 -0700
From: Niall Gaffney <gaffney@stsci.edu>
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To: Roy Williams <roy@cacr.caltech.edu>
CC: metadata@us-vo.org, registry@ivoa.net
Subject: Re: Registry usecases
References: <3E369D4B.3090102@stsci.edu> <02b001c2c7b3$8ddba250$6401a8c0@cacr.caltech.edu>
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Roy,

I think were going the right way. I have added some comments on 2 and 3 
to sort of look at what sorts of advanced registry queries we can handle 
to help the user choose the right services for their problem.

Roy Williams wrote:

>2> I have discovered a subclass of dwarf galaxies that fall into a
>particular color, color, absolute V mangeude space.  I need to get
>
....

>I'm not sure what are the dependancies you are talking about. Perhaps
>you could define more closely this "Sloan - 2Mass cross correlation
>color service"?
>
This is just someones results of combining Sloan and 2Mass which now 
resides as a catalog availble from the VO.  It has the coverage region 
of Sloan. What it is is not important, just that it has the information 
with UCDs that can be made into the UCDs that are what I need.

So not to go into implemetaton too much (I'll implement a couple of 
users but not the registry)...here is a couple of flows of how this 
might be done.  

1> Query registry for photometric catalogs for these objects that have 
the UCDs I need
2> Discover that there is derived photometry in a catalog that does the 
trick for region X
3> Query registry for data sources that cover NOT X that have data from 
which I can derive the UCDs that are of interest to me
4> Discover that for the region NOT X there are data providers to do the 
trick from two data sources

Its this handling of the regions and logic (we might need NOT X AND NOT 
Y too) in both the query and the results that is the power here.  

>>3> I want to make the highest S/N image of a region of the sky in the V  
>>  
>>
>>band from all images available to study a very distant galaxy cluster's structure.  
>>
...

>This wants metadata about the survey itself (sky coverage), plus
>metadata about an image survey (resolution, wavebands). Probably the
>"independent observation" part you would have to check carefully
>yourself, I wouldn't want to trust a computer with that.
>
I agree that checking it yourself is probably the way to go, but if the 
registry gives me the metadata and methods to backtrack the parents 
lineage, I could do the research quickly.

However my second use case shows a different reason for having the 
registry know about some form of lineage.  By knowing which dataparent 
was not the limiting factor in the all sky coverage of the catalog, you 
could make sure you use the 2-mass data to fill out the other half of 
the sky, combining it with some other souther sky optical survey of our 
choosing.

Looking at Rays use cases I think most of what is needed is listed in 
there.  I think the power of logic on regions and some simple lineage 
infomation will take us the rest of the way.

Niall

From - Wed Jan 29 23:53:24 2003
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Date: Wed, 29 Jan 2003 16:52:16 -0600 (CST)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: registry@ivoa.net
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---1903330751-1654372197-1043880736=:27671
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Hi,

NVO has started a discussion of registries within our Metadata working 
group, and so I want to share a bit of where we are and to broaden the 
discussion to the IVOA community.

I drafted some requirements that we've discussed and edited slightly; the
latest version is attached.  (At some point, I'll upload them to the Wiki
site.)  I tried to keep them fairly general and solution-free.  More 
comments, additions, or subtractions are welcome.  The plan is to use 
these requirements to evaluate some existing solutions, including the Open 
Archive Initiative (http://www.openarchives.org/), UDDI, GLU, and 
Globus/OGSA.  All solutions are on the table.  

In our telecon discussion, we quickly concluded that an evaluation of the 
requirements would be helped greatly by some use cases, so we started 
generating those.  The ones generated thus far can be reviewed at the Wiki 
site (http://www.ivoa.net/twiki/bin/view/IVOA/RegistryUseCases).

We talked a little bit about an architecture for registries.  We agreed 
that we prefered a model in which every site has a local mechanism for 
describing oneself that is controlled and update as necessary by the site 
itself; registries then would access this "explain" service to update its 
internal database.  In this model, the process of "registering" is, at a 
minimum, a matter of giving a registry a pointer (e.g. URL) to the 
"explain" service.  The GLU/DNS model for synchronizing registries was 
also very attractive.

cheers,
Ray





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From - Wed Jan 29 17:33:23 2003
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From: "Roy Williams" <roy@cacr.caltech.edu>
To: "Niall Gaffney" <gaffney@stsci.edu>
Cc: <metadata@us-vo.org>, <registry@ivoa.net>
References: <3E369D4B.3090102@stsci.edu>
Subject: Re: Registry usecases
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Niall

Thank you for these excellent use cases. Maybe I can present some
components and their relationshios that might make solutions.

First, I am assuming a single virtual repository that actually
consists of a collection of individually published repositories. Each
major data center, and others, would present their datasets by a
standard, harvestable protocol, and these can be collected by regular
robotic harvesting into one or more collector repositories. Think of
the collector as being run by NVO, AVO, etc, and a repository as being
run by Vizier, MAST, CfA, etc. From the repository, we find out about
a dataset, eg 2MASS, Rosat, etc.

> 1> A SN goes off but isn't detected until well after its peak  I
want to
> get all IR, Optical, and UV data (derived photometry or images or
> spectra) from any data source that may have been observing it during
a
> specified time period that has a chanse of detecting/resolving it.
This
> needs to reject all sky surveys that didnt observe during this
period of
> time (e.g. DSS), but should include any pointed observations that
might
> have done this.

Probably a good strategy for this case is to ask the collector for
datasets with the word "synoptic" in the descriptive text of each
dataset -- surely these are the only ones that will have data from 2
weeks ago? If the repository chose to exhibit the space/time metadata
description, then we can ask it (or the collector) to check if we have
the right overlap before even contacting the candidate dataset.

We hope that the datasets themselves have some NVO services running.
We can imagine that the Cone Search version 2 will include a time
window, so that a single cone/time serach can be sent automatically to
many candidate datasets. For the others, we do what we do now -- spend
human time figuring out how their idiosyncratic interface works, and
then pose the query we want to pose.

> 2> I have discovered a subclass of dwarf galaxies that fall into a
> particular color, color, absolute V mangeude space.  I need to get
> colors U-K and R-H (either colors, magnetudes, or data from which
> mangetudes can be extracted in that order) for dwarf galaxies with
known
> V mangetudes and redshift or absolute V mangetudes to make up a
> candidate list for followup observations. So for this I would like
to
> know which services that provide the colors I need are based on
other
> data in the VO, so I don't redo the color measurement when I don't
have
> to (i.e. allow me to discover the region where a the Sloan - 2Mass
cross
> corelation color service and not Sloan and 2Mass data services where
for
> areas covered by Sloan, and then to fall back onto images from 2Mass
and
> a different optical survey for which no cross corelation exists
where
> Sloan didn't observe.  Also it shouldn't tell me to try the South
Pole
> observatory which cannot observe during the time the SN went off).

I'm not sure what are the dependancies you are talking about. Perhaps
you could define more closely this "Sloan - 2Mass cross correlation
color service"?

But the part about catalogs that have specific datatypes is pretty
good in Vizier -- you select the UCDs for the attributes you want, and
ask Vizier which catalogs have those attributes.

> 3> I want to make the highest S/N image of a region of the sky in
the V
> band from all images available to study a very distant galaxy
cluster's
> structure.  For this I need all independant observations (e.g. not
based
> on the same raw data) at V of this area of the sky that have a
> resolution and pixel size on the sky of at least 1 and 0.5
arcseconds
> respectivly so I can resample and combine them.

This wants metadata about the survey itself (sky coverage), plus
metadata about an image survey (resolution, wavebands). Probably the
"independent observation" part you would have to check carefully
yourself, I wouldn't want to trust a computer with that.

Roy

From - Thu Jan 30 16:52:24 2003
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Date: Thu, 30 Jan 2003 14:05:24 +0000 (GMT)
From: Elizabeth Auden <eca@mssl.ucl.ac.uk>
To: Niall Gaffney <gaffney@stsci.edu>
cc: Roy Williams <roy@cacr.caltech.edu>, metadata@us-vo.org, registry@ivoa.net
Subject: Re: Registry usecases
In-Reply-To: <3E383C79.4000208@stsci.edu>
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Hello,

> I agree that checking it yourself is probably the way to go, but if the 
> registry gives me the metadata and methods to backtrack the parents 
> lineage, I could do the research quickly.

> Looking at Rays use cases I think most of what is needed is listed in 
> there.  I think the power of logic on regions and some simple lineage 
> infomation will take us the rest of the way.

The Astrogrid registry workgroup is having a focus meeting in 3 weeks to
talk about information that should be included in web service descriptions
for the registry.  I'd be very interested if you could expound your ideas
about lineage information a little.

Thank you!
Elizabeth Auden


From - Thu Jan 30 22:17:26 2003
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From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Ray Plante'" <rplante@ncsa.uiuc.edu>
Cc: <registry@ivoa.net>
Subject: RE: Registry Topics
Date: Thu, 30 Jan 2003 21:08:28 -0000
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Hi Ray,

Any registered member can create new pages in a wiki site. If you edit
any page and add a reference to your new page in the form of a wiki word
(starts with capital letter and has at least one more capital in it -
usually capitalized words strung together, eg IvoaRegistry, IvoaResReg,
RayPlante etc.) wen you save the page you'll see that word with a
question mark after it. Click on the question mark and it'll create the
new page for you then you just need to add the text using the wiki
shorthand or html.

If you're not sure what to do, check out the tutorial, manual and other
stuff referenced from the Twiki page:
  http://www.ivoa.net/twiki/bin/view/TWiki/WebHome
especially the one-page primers.

To try stuff out, use the Test web:
  http://www.ivoa.net/twiki/bin/view/Test/WebHome

You'll see some samples there of pages that haven't yet been created
(TestTopic1, TestTopic2 etc - all with question marks after them). Click
on the question mark after one of these to create a new page and then
try doing the tutorial:
  http://www.ivoa.net/twiki/bin/view/TWiki/TWikiTutorial

As it says, it'll only take 20 minutes or so. It seems strange at first
but is dead simple once you've created a couple of pages. Another way to
get familiar with the wiki style etc is to click Edit on existing pages
and see how the page has been written.

Once you're okay with the wiki, just choose whichever page you want to
have a link to your new page, edit it to include the new page name (as a
wiki word), save it, click on the question mark and there you'll have a
blank page ready to fill.

Hope this helps out. I've copied this to the Registry mailing list as
well in case others are unfamiliar with the wiki.

Cheers,
Tony.

> -----Original Message-----
> From: Ray Plante [mailto:rplante@poplar.ncsa.uiuc.edu] 
> Sent: 30 January 2003 15:55
> To: Tony Linde
> Subject: Registry Topics
> 
> 
> Hi Tony,
> 
> I trust your London trip was full of good fortune.  I had a 
> question about 
> the registry wiki site.  Is it possible for users to add 
> topics, or is 
> that restricted to the moderator/administrator?  In any 
> event, would it be 
> appropriate to add a requirements topic?  Or should we 
> combine that with 
> the RegistryUseCases topic?  I'd like to post our 
> requirements document 
> somewhere.
> 
> cheers,
> Ray
> 
> 

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From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Ray Plante'" <rplante@ncsa.uiuc.edu>, <registry@ivoa.net>
Subject: RE: Registry Topics
Date: Thu, 30 Jan 2003 21:14:46 -0000
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Ray,

I've just noticed that you've added stuff to part of the IVOA wiki -
sorry if this message sounded patronising - I assumed you were
unfamiliar with wiki's.

Cheers,
Tony.

> -----Original Message-----
> From: Tony Linde [mailto:ael@star.le.ac.uk] 
> Sent: 30 January 2003 21:08
> To: 'Ray Plante'
> Cc: registry@ivoa.net
> Subject: RE: Registry Topics
> 
> 
> Hi Ray,
> 
> Any registered member can create new pages in a wiki site. If 
> you edit any page and add a reference to your new page in the 
> form of a wiki word (starts with capital letter and has at 
> least one more capital in it - usually capitalized words 
> strung together, eg IvoaRegistry, IvoaResReg, RayPlante etc.) 
> wen you save the page you'll see that word with a question 
> mark after it. Click on the question mark and it'll create 
> the new page for you then you just need to add the text using 
> the wiki shorthand or html.
> 
> If you're not sure what to do, check out the tutorial, manual 
> and other stuff referenced from the Twiki page:
>   http://www.ivoa.net/twiki/bin/view/TWiki/WebHome
> especially the one-page primers.
> 
> To try stuff out, use the Test web:
>   http://www.ivoa.net/twiki/bin/view/Test/WebHome
> 
> You'll see some samples there of pages that haven't yet been 
> created (TestTopic1, TestTopic2 etc - all with question marks 
> after them). Click on the question mark after one of these to 
> create a new page and then try doing the tutorial:
>   http://www.ivoa.net/twiki/bin/view/TWiki/TWikiTutorial
> 
> As it says, it'll only take 20 minutes or so. It seems 
> strange at first but is dead simple once you've created a 
> couple of pages. Another way to get familiar with the wiki 
> style etc is to click Edit on existing pages and see how the 
> page has been written.
> 
> Once you're okay with the wiki, just choose whichever page 
> you want to have a link to your new page, edit it to include 
> the new page name (as a wiki word), save it, click on the 
> question mark and there you'll have a blank page ready to fill.
> 
> Hope this helps out. I've copied this to the Registry mailing 
> list as well in case others are unfamiliar with the wiki.
> 
> Cheers,
> Tony.
> 
> > -----Original Message-----
> > From: Ray Plante [mailto:rplante@poplar.ncsa.uiuc.edu]
> > Sent: 30 January 2003 15:55
> > To: Tony Linde
> > Subject: Registry Topics
> > 
> > 
> > Hi Tony,
> > 
> > I trust your London trip was full of good fortune.  I had a
> > question about 
> > the registry wiki site.  Is it possible for users to add 
> > topics, or is 
> > that restricted to the moderator/administrator?  In any 
> > event, would it be 
> > appropriate to add a requirements topic?  Or should we 
> > combine that with 
> > the RegistryUseCases topic?  I'd like to post our 
> > requirements document 
> > somewhere.
> > 
> > cheers,
> > Ray
> > 
> > 
> 

From - Fri Jan 31 14:57:26 2003
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From: "Tony Linde" <ael@star.le.ac.uk>
To: "Registry_Ivoa_List" <registry@ivoa.net>
Subject: comments
Date: Fri, 31 Jan 2003 13:56:45 -0000
Organization: University of Leicester
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A few comments on the traffic here and in the us-vo/metadata list. I'll
not identify the sources to which my comments are directed - these are
my thoughts/proposals prompted by reading the other messages on the
train yesterday.

1. The VO is not a thing, it is a space with rules of entry and
engagement which we are all helping to create (like the 'web').

2. Registries will exist within the VO to:
 a. catalogue metadata for VO resources; 
 b. help with narrowing the search for resources.

3. Registries will be organised in some IVOA standard manner (peer to
peer, DNS-type hierarchy etc.) that does not require any central
authority.

4. Each registry will have a namespace as its unique ID. (A new registry
attempting to enter the VO space with a conflicting ID will be denied
entry.)

5. Every resource must have a unique ID. The resource id will be created
by the registry with which the resource registers. That id will consist
of the registry namespace followed by some (registry-specified) unique
identifier.

6. Elements within a registered resource may or may not be uniquely
identified. Any id will have the resource as its scope.

7. Registries will share resource metadata using some IVOA standard
method (to support active - harvesting - and passive updating).

8. Resource owners will make updated resource metadata available in one
of several standard ways.

9. Resource relationships (eg 'is derived from', 'was copied from', 'was
extracted from', 'provides access to', etc.) will be specified as
metadata in one or both resource registry entries.


Finally, some ideas or potential guidelines:

A. IVOA should define minimum standards needed to make interoperability
feasible.

B. IDs should identify one thing only; they should not carry any
embedded meaning or structure (eg 5th letter codes for the astronomer's
gender preference). This is FATAL to any system.

C. Registry granularity beyond the IVOA minimum is up to the Registry
owner. A Resource owner may register that resource with a registry which
maintains a preferred level of metadata.

D. Registries should provide both a web service and GUI interface for
registering and updating resource metadata.

E. A registry may implement a 'time to live' for entries, so unless a
resource regulary states that it is still alive, the resource entry is
removed or flagged as dormant.

F. 'Sameness' is a major and very difficult issue. Not just about copies
of data. If one field in one row of a 10Gb table is changed, is it the
same resource? If so, how do we enable reruns or checks on published
analyses? If not, how do we maintain identity linkage? Tricky!

G. I've been assuming that everything in a registry is a 'resource',
whether it is a service, archive, dataset etc. I think that a service
which gives access to a dataset should be registered as that dataset.
Further metadata will describe how to get the data using the service. If
the service provides further features, perhaps it should also be
registered, but as a service.


That's all for now - all I can think of - I'll try to keep up with
traffic in future and comment at the right time.

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 - Fri Jan 31 15:25:34 2003
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From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: RE: comments
Date: Fri, 31 Jan 2003 14:25:10 -0000
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Status:   

Couple more thoughts.

The registry is really a sort of Resource Name Server but providing more
that just identifiers with extra metadata about the resource, more
functional search facilities and, possibly, additional services.

People, groups and communities won't be first registered in a Registry
but in a Community Server (Community Name Server?) where they'll be
assigned unique IDs created from the community namespace plus some
community-specific identifier (eg //cas.le.ac.uk/TonyLinde).

Cheers,
Tony. 

> -----Original Message-----
> From: Tony Linde [mailto:ael@star.le.ac.uk] 
> Sent: 31 January 2003 13:57
> To: Registry_Ivoa_List
> Subject: comments
> 
> 
> A few comments on the traffic here and in the us-vo/metadata 
> list. I'll not identify the sources to which my comments are 
> directed - these are my thoughts/proposals prompted by 
> reading the other messages on the train yesterday.
> 
> 1. The VO is not a thing, it is a space with rules of entry 
> and engagement which we are all helping to create (like the 'web').
> 
> 2. Registries will exist within the VO to:
>  a. catalogue metadata for VO resources; 
>  b. help with narrowing the search for resources.
> 
> 3. Registries will be organised in some IVOA standard manner 
> (peer to peer, DNS-type hierarchy etc.) that does not require 
> any central authority.
> 
> 4. Each registry will have a namespace as its unique ID. (A 
> new registry attempting to enter the VO space with a 
> conflicting ID will be denied
> entry.)
> 
> 5. Every resource must have a unique ID. The resource id will 
> be created by the registry with which the resource registers. 
> That id will consist of the registry namespace followed by 
> some (registry-specified) unique identifier.
> 
> 6. Elements within a registered resource may or may not be 
> uniquely identified. Any id will have the resource as its scope.
> 
> 7. Registries will share resource metadata using some IVOA 
> standard method (to support active - harvesting - and passive 
> updating).
> 
> 8. Resource owners will make updated resource metadata 
> available in one of several standard ways.
> 
> 9. Resource relationships (eg 'is derived from', 'was copied 
> from', 'was extracted from', 'provides access to', etc.) will 
> be specified as metadata in one or both resource registry entries.
> 
> 
> Finally, some ideas or potential guidelines:
> 
> A. IVOA should define minimum standards needed to make 
> interoperability feasible.
> 
> B. IDs should identify one thing only; they should not carry 
> any embedded meaning or structure (eg 5th letter codes for 
> the astronomer's gender preference). This is FATAL to any system.
> 
> C. Registry granularity beyond the IVOA minimum is up to the 
> Registry owner. A Resource owner may register that resource 
> with a registry which maintains a preferred level of metadata.
> 
> D. Registries should provide both a web service and GUI 
> interface for registering and updating resource metadata.
> 
> E. A registry may implement a 'time to live' for entries, so 
> unless a resource regulary states that it is still alive, the 
> resource entry is removed or flagged as dormant.
> 
> F. 'Sameness' is a major and very difficult issue. Not just 
> about copies of data. If one field in one row of a 10Gb table 
> is changed, is it the same resource? If so, how do we enable 
> reruns or checks on published analyses? If not, how do we 
> maintain identity linkage? Tricky!
> 
> G. I've been assuming that everything in a registry is a 
> 'resource', whether it is a service, archive, dataset etc. I 
> think that a service which gives access to a dataset should 
> be registered as that dataset. Further metadata will describe 
> how to get the data using the service. If the service 
> provides further features, perhaps it should also be 
> registered, but as a service.
> 
> 
> That's all for now - all I can think of - I'll try to keep up 
> with traffic in future and comment at the right time.
> 
> 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 - Fri Jan 31 17:49:18 2003
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From: "Robert Hanisch" <hanisch@stsci.edu>
To: <interop@ivoa.net>, <registry@ivoa.net>, <dal@ivoa.net>
Cc: <ivoa@ivoa.net>
Subject: proposal to register FITS MIME types
Date: Fri, 31 Jan 2003 11:47:32 -0500
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Steve Allen (Lick Observatory) is taking the lead on a proposal to register
FITS MIME types.  He is looking for review and feedback from the
international VO community.  If you have an interest or views on this,
please have a look at Steve's proposal.

Thanks,
Bob

(Sorry for any multiple deliveries of this message!)

----- Original Message -----
From: "Steve Allen" <sla@ucolick.org>
To: "FITSMIME" <fitsmime@nrao.edu>
Sent: Wednesday, January 22, 2003 2:58 AM
Subject: [fitsmime] reaction to the draft?


> The Internet Draft to register MIME types for FITS has benefitted from
> several good suggestions during the past few weeks.  It is still at
> http://www.ucolick.org/~sla/fits/mime/
> along with the ancillary documentation about the process.  I hope to
> announce the draft to fitsbits/sci.astro.fits in a while as a general
> call for comments prior to beginning the formal proceedings to get
> clearance from the FITS community, prior to submitting the draft to
> the internet community.
>
> Reviews and comments about the draft from the VO community would be
> most welcome, for I remain concerned that the draft may not adequately
> address those needs.
>
> --
> Steve Allen          UCO/Lick Observatory       Santa Cruz, CA 95064
> sla@ucolick.org      Voice: +1 831 459 3046
http://www.ucolick.org/~sla
> PGP: 1024/E46978C5   F6 78 D1 10 62 94 8F 2E    49 89 0E FE 26 B4 14 93
> _______________________________________________
> fitsmime mailing list
> fitsmime@listmgr.cv.nrao.edu
> http://listmgr.cv.nrao.edu/mailman/listinfo/fitsmime
>

From - Mon Feb  3 14:07:31 2003
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From: Andrew Lawrence <al@roe.ac.uk>
To: "'registry@ivoa.net'" <registry@ivoa.net>
Subject: Re: comments
Date: Mon, 3 Feb 2003 13:01:49 -0000 
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Status:   

I generally endorse Tony's comments. I think we need to aim at defining
a minimum standard.

(1) I strongly agree that we must keep the VO an enabling infrastructure
rather than an actual structure. Getting the right approach to the
Registry is a key step in getting the philosophy right. We shouldn't be
over prescriptive. It should be possible to have multiple Registries.
Registries should not require a supervising authority. A Registry should
be a service somebody can offer competitively, just like offering data
search services  etc.

(2) On the other hand, we want as much as possible of the software we
develop in the various VO projects to be inter-operable. 

(3) Each VO project should be free to use its own choice of
implementation technology, consistent with the interoperability
principle, and also free to make design choices, such as whether their
registry is fine grained or coarse grained. (At this stage we probably
want to positively encourage a diversity of choices, for technical
experimentation.)

The conclusion is that the IVOA forum should aim at answering the
question "what is the MINIMUM set of agreed standards that we should
agree on" ? I think some of the US-VO resource data document is relevant
to this aim, and some goes beyond it. Likewise in AstroGrid we are
starting to make some specific technology choices that we should not
necessarily force on others.

I am aware that all the above is rather vague and woofly. I will try to
think through what it means in more concrete terms. As soon as I get
through andoher eight classes and another six committees.

   andy


====================================================================
Andy Lawrence                       e-mail      al@roe.ac.uk
Edinburgh Institute for Astronomy   Direct      (UK)-(0)131-668-8346
University of Edinburgh             ROE switch  (UK)-(0)131-668-8100
Royal Observatory Edinburgh         Liz Gibson  (UK)-(0)131-668-8356
Blackford Hill                     (Admin Asst) 
Edinburgh EH9 3HJ                   Fax         (UK)-(0)131-668-8416
====================================================================

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From: "Roy Williams" <roy@cacr.caltech.edu>
To: "Andrew Lawrence" <al@roe.ac.uk>, <registry@ivoa.net>
References: <7FF38AA9D29BD611BCAA00105AA28F29094BA4@MERCURY>
Subject: Re: comments
Date: Mon, 3 Feb 2003 08:20:40 -0800
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Andy

I am trying to push OAI. I believe it to be just the simple and
flexible standard that can federate our registries. Librarians use it
everywhere. The ADS uses it.

> (1) I strongly agree that we must keep the VO an enabling
infrastructure
> rather than an actual structure. Getting the right approach to the
> Registry is a key step in getting the philosophy right. We shouldn't
be
> over prescriptive. It should be possible to have multiple
Registries.
> Registries should not require a supervising authority. A Registry
should
> be a service somebody can offer competitively, just like offering
data
> search services  etc.

The OAI model is based on multiple registries (eg one at Edinburgh,
one at Caltech, etc). There could also be collector registries (eg
Astrogrid, AVO, NVO). It works because the protocol is *harvestable*.
You can ask for identifiers of all records that are more recent than a
given date. Therefore a robot can do this on a regular basis, grabbing
everything new from a group of other registries, so new records in one
registry percolate to others. A harvestable protocol means a
distributed virtual registry.

> (2) On the other hand, we want as much as possible of the software
we
> develop in the various VO projects to be inter-operable.

I think that the IVOA *must* agree on something harvestable, otherwise
nobody will be able to find what has been published.

The GLU system is made to be harvested. I think I know how to build a
OAI service on top of GLU. I believe that UDDI is also harvestable,
but I think the only things you can regiater in the registry are web
services. With OAI you can register anything you like.

> (3) Each VO project should be free to use its own choice of
> implementation technology, consistent with the interoperability
> principle, and also free to make design choices, such as whether
their
> registry is fine grained or coarse grained. (At this stage we
probably
> want to positively encourage a diversity of choices, for technical
> experimentation.)

I agree entirely about implementation. I don't care if your brain is
made of cheese, so long as you say the right things! However, I point
out the large collection of open-source tools at the OAI site:
http://www.openarchives.org/tools/index.html

Once we have something harvestable, the next choices concern the
nature of the entities that are described in the registry, which then
crystallizes to the XML schema used to describe that entity. This
comes to the graininess issues. In a telecon last week, we (NVO)
thought it would be good to register a *table* (ie catalog) into the
registry, but it would not be good to register each *record* from that
table. (Librarians record books, not pages from books.) If you want to
record pages, then our robot will probably not harvest them. It will
only ask about the larger entities (tables).

In order to make a IVOA regstry of tables, we would need to agree on
the metadata description of a table.

> The conclusion is that the IVOA forum should aim at answering the
> question "what is the MINIMUM set of agreed standards that we should
> agree on" ? I think some of the US-VO resource data document is
relevant
> to this aim, and some goes beyond it. Likewise in AstroGrid we are
> starting to make some specific technology choices that we should not
> necessarily force on others.

What are these specific technology choices?

Roy

From - Mon Feb  3 18:36:41 2003
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From: "Tony Linde" <ael@star.le.ac.uk>
To: registry@ivoa.net
Date: Mon, 03 Feb 2003 17:34:19 +0000
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Subject: Re: comments
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> I am trying to push OAI. I believe it to be just the simple and
> flexible standard that can federate our registries.

>From what you've written so far, Roy, OAI does look useful. We need to
look at it in detail and see how much of it we want to implement. There
seem to be standards for document format, layout and exchange and others
for the protocols of how the registries work. I don't know enough about
it to comment on any of these, but assume that we could adopt the format
and layout and choose our own registry protocols if it better suits us.

I think the best use of OAI, GLU at this stage is to help us define the
requirements for VO registries and how they interoperate, eg:

> It works because the protocol is *harvestable*

do we 'need' registries to be harvestable? and is it mandatory or
optional? and how does a registry specify its harvest area? etc.

> A harvestable protocol means a
> distributed virtual registry.

As could a peer-to-peer 'push' type of protocol.

> I don't care if your brain is
> made of cheese, so long as you say the right things! 

You promised not to repeat that!!

> If you want to
> record pages, then our robot will probably not harvest them. It will
> only ask about the larger entities (tables).

A good reason for 'harvest' rather than 'push': to ignore info the
registry not able to use. But do we want this?

> > Likewise in AstroGrid we are
> > starting to make some specific technology choices that we should not
> > necessarily force on others.
> 
> What are these specific technology choices?

The choices are, firstly along the lines of your granularity choice -
which will probably turn out to be the same as your level - and secondly,
we are going to build a working registry within the next six months -
which is why we're pushing to get people discussing this stuff now.

Getting back to the requirements, I guess we need to distinguish between
requirements and options. A requirement would be that each registry
'knows' about the resources in other registries. Options for fulfilling
that would be a harvesting method or a push method (among possibly
others). We'd then need to get into technical options of how the chosen
method was defined as a protocol.

Anyone want to start pumping in some requirements?

Cheers,
Tony (on a Java course, not paying attention).


On Mon, 3 Feb 2003 08:20:40 -0800, "Roy Williams" <roy@cacr.caltech.edu>
said:
> Andy
> 
> I am trying to push OAI. I believe it to be just the simple and
> flexible standard that can federate our registries. Librarians use it
> everywhere. The ADS uses it.
> 
> > (1) I strongly agree that we must keep the VO an enabling
> infrastructure
> > rather than an actual structure. Getting the right approach to the
> > Registry is a key step in getting the philosophy right. We shouldn't
> be
> > over prescriptive. It should be possible to have multiple
> Registries.
> > Registries should not require a supervising authority. A Registry
> should
> > be a service somebody can offer competitively, just like offering
> data
> > search services  etc.
> 
> The OAI model is based on multiple registries (eg one at Edinburgh,
> one at Caltech, etc). There could also be collector registries (eg
> Astrogrid, AVO, NVO). It works because the protocol is *harvestable*.
> You can ask for identifiers of all records that are more recent than a
> given date. Therefore a robot can do this on a regular basis, grabbing
> everything new from a group of other registries, so new records in one
> registry percolate to others. A harvestable protocol means a
> distributed virtual registry.
> 
> > (2) On the other hand, we want as much as possible of the software
> we
> > develop in the various VO projects to be inter-operable.
> 
> I think that the IVOA *must* agree on something harvestable, otherwise
> nobody will be able to find what has been published.
> 
> The GLU system is made to be harvested. I think I know how to build a
> OAI service on top of GLU. I believe that UDDI is also harvestable,
> but I think the only things you can regiater in the registry are web
> services. With OAI you can register anything you like.
> 
> > (3) Each VO project should be free to use its own choice of
> > implementation technology, consistent with the interoperability
> > principle, and also free to make design choices, such as whether
> their
> > registry is fine grained or coarse grained. (At this stage we
> probably
> > want to positively encourage a diversity of choices, for technical
> > experimentation.)
> 
> I agree entirely about implementation. I don't care if your brain is
> made of cheese, so long as you say the right things! However, I point
> out the large collection of open-source tools at the OAI site:
> http://www.openarchives.org/tools/index.html
> 
> Once we have something harvestable, the next choices concern the
> nature of the entities that are described in the registry, which then
> crystallizes to the XML schema used to describe that entity. This
> comes to the graininess issues. In a telecon last week, we (NVO)
> thought it would be good to register a *table* (ie catalog) into the
> registry, but it would not be good to register each *record* from that
> table. (Librarians record books, not pages from books.) If you want to
> record pages, then our robot will probably not harvest them. It will
> only ask about the larger entities (tables).
> 
> In order to make a IVOA regstry of tables, we would need to agree on
> the metadata description of a table.
> 
> > The conclusion is that the IVOA forum should aim at answering the
> > question "what is the MINIMUM set of agreed standards that we should
> > agree on" ? I think some of the US-VO resource data document is
> relevant
> > to this aim, and some goes beyond it. Likewise in AstroGrid we are
> > starting to make some specific technology choices that we should not
> > necessarily force on others.
> 
> What are these specific technology choices?
> 
> Roy
> 
> 
__
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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From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: metadata@us-vo.org, <registry@ivoa.net>
Subject: Re: IDs and ID services
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Status:   

I'm happy to see the international discussion picking up.  This message is 
mainly about identifiers; however, I wanted to preface it with some 
context about the discussion initiated within the NVO Metadata Working 
Group.  While registries and the use of IDs are interdependent, I have 
been trying to talk about them separately as we define the scope of the 
problem we want to address (and hopefully bring some order to what 
otherwise might be a random walk).  

On the ID side, I assembled some requirements for IDs from the many
comments from the discussion 
(http://rai.ncsa.uiuc.edu/~rplante/VO/metadata/oidreq.txt).  This 
should looked at like a menu--pick the things you agree with.  Better yet: 
indicate the things you don't agree with.  Requirements are generally 
considered a good first step to design as it defines the scope of the 
problem you are trying to solve.  As Andy implied, the requirements for 
IVOA as a whole might be looser that what we specify for NVO.

This week, Tom shared should thoughtful comments about how we might
approach IDs.  (He brought up the term "keys", by analogy to DBs; however,
the term is synonymous.)  This message is an attempt to enunciate how his
framework maps onto the requirements list--I hope Tom can comment on
whether I got it right.  The main conclusion is that IDs are only used
determine "sameness"; infering ownership or derivation directly from IDs
is not to be required.

  1. Single Framework:  Okay 

  2. Determine "sameness" from 2 IDs:  Okay for the most part
	*  direct determination only possible when IDs have been issued by 
           the same ID service.
        *  cross-ID service comparison requires translation.  
	*  because data mirrors can reuse identifiers (req. 7), it is 
	   expected that the need for translation will be rare and
	   practically unnecessary.

  3. Avoiding needless duplication:  Okay (see notes above).

  4. Identifying different formats of same object:  Unspecified (No?)
  
  5. Identifying curator:  No
        *  The ID is not necessarily issued by the curator.  However,
	   it is possible to retrieve this information by using the ID
	   to access the item's description.

     This might suggest a different requirement (which I've added):

       5.b.  It should be easy to identify the resource having issued the
	     identifier.

     This would allow one to get more information about the item
     identified.  Note, however, that Tom's outline does not imply
     this requirement (since one must query an ID service to determine
     if it includes a particular ID).

     Another requirement I might add which was part of the registry
     requirements:

       5.c  It should be possible to use the ID to access a unique
            description of the item it identifies.

     That is, for any information you can't glean from an ID, you can
     get from a description accessed with the ID.

  6. Collection membership:  No

  7. Reuse of IDs by mirrors:  Yes

  8. Derivation:  No

  9. Provider control over assignment:  Yes
        *  Provider can run their own ID service.

Personally, I think this approach is about right in its scope.
However, I think it would be useful if all you had was an ID, you
could infer which service you could invoke to get more information
about it.  As an example, if you have an ID, "//cas.le.ac.uk/TonyLinde", 
you could go to "http://cas.le.ac.uk/getDescription?//cas.le.ac.uk/TonyLinde"
and discover what this TonyLinde is and who takes care of it.  I also 
think that we need to decide whether (for example) the same images in 
different formats (e.g. as returned from an SIA image query) should have 
the same ID.  

cheers,
Ray





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From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
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To: registry@ivoa.net
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>From the NVO metadata list...

---------- Forwarded message ----------
Date: Thu, 30 Jan 2003 13:01:45 -0500
From: Tom McGlynn <Thomas.A.McGlynn@nasa.gov>
To: metadata@us-vo.org
Subject: IDs and ID services

Here are some thoughts on IDs that I tried to say a little
bit about in the telecon.

Let's start abstractly...

An ID identifies an element of a set.

When we define a 'unique id' we are attempting to set up
a one-to-one correspondence between a set of id's and
a set of referents.

There are many possible sets for which we would
like IDs.  Indeed it is likely that we
want to have IDs for the sets that we are identifying.



If we become a little more concrete and start looking
at the Virtual Observatory, we see that we have many different
cases where we want to identify set elements: different archives,
different observations within a mission, different objects within
a tables.  In many cases there is already an ID available within
the limited context of the resource being considered.  E.g., many
tables have an row ID field included, or the observation ID may be
well defined.


Within the VO we want to use IDs for three purposes: to distinguish,
to match and to show a relationship.

If two objects are different, then they should have different IDs.  E.g.,
the HEASARC WGACAT catalog has multiple observations of the same X-ray
objects.  Their target name is the same, but there is another unique identifier
which distinguishes these objects.

If two objects are the same in the context chosen, then they should
have the same ID.  If I am interested in whether two datasets are derived from
the same observation, then the observation ID should be used as the ID
even though the datasets may be quite different (e.g., one is a raw data
set and the other is a list of objects generated from running a source
extractor on the first.

We also use ID's to show relationships among objects.  We can do this either
be encoding ID's of the related objects, or by have ID fields that refer to other
objects.  E.g., the observation ID may encode information about the instrument
used, or we may have a field in the observation table that shows the instrument.
Both of these preserve a relationship between the set of 'observations' and the
set of instruments (for a given mission).

There is a lot of commonality between the ID concepts and the use of unique and
foreign keys in relational databases.


So rather than spend a lot of time talking specific requirements on IDs and how
they might be used, I would suggest
that we define a "Key" object to be one of the kinds of objects that VO services
can talk about.  A Key object is quite simple.  It's only characteristic is
that two Key objects can be compared for equality.

In addition to Key objects we would define Key Services.  A key service
corresponds to a set for which we are defining keys.  In general we
may think of each key as belonging to some key service.

A Key service provides the following functionality:
   The service as a whole has a unique Key associated with it.
   It may be able indicate whether a given Key is a member of the set of Keys known to
this service.
   It may be able to provide a new Key for dynamic sets of objects.
   It may be able to provide a link to some other VO object
associated with the key.
   Given a Key thats associated with some other service and the key to that
Key Service it may be able to translate the key from the other service to this
service.

In JavaSpeak we have:

      boolean match     = key.equals(Key someOtherKey);   // Required.

      Key serviceKey    = service.getServiceKey();        // Required
      boolean included  = service.includes(Key key);      // Optional
      Key newKey        = service.getNewKey();            // "
      Key newKey        = service.translate(Key keyDefiningSomeOtherService,
                                            Key keyToSomeObjectUsingOtherKeyService); // "


Some kind of root VO Key service might be needed.  Note that the only functionality
a key service is required to have is that it itself be identified, i.e., we need
to uniquely identify the set we are talking about.


Using this very basic concept of keys, other services can build up their
own identifiers.  E.g., to use Ray's DSS example, the metadata for the STScI
DSS service would indicate that the string formed by some fields is a key
for the plates for this service.  It would also indicate that the
key for the DSS Key service is DSSKey.  At Illinois, they might have a mirror
of the DSS, with the same entries.  Noting that the services use the same key
service, someone trying to compare data could just check to see if the keys
were the same.  At the NOAO they may have the same plates, but they use a different
key system to identify the plates.  So they have a different key service.
If someone wants to check that two plates are the same between ST and
NOAO, then they can try to translate the key from one service to the other.
If someone has built the translator all is copacetic, otherwise the user is
out of luck.


A registry might require that each table service define the key fields and key service
used by that table, similarly for each archive of observations.  The idea is that
we provide a mechanism by which systems can in general show that data is the same,
but we don't mandate some overarching key system that everyone is required
to maintain (other than perhaps the root KeyService).


I hope this isn't more confusing than helpful.  It just seems to me that detailed
discussions of how we build and use keys are really premature.  They will
be used in very different ways in different places and times.  What I think
we can do is begin to indicate that certain things are keys and try to establish
a mechanism that defines the context of the key (i.e., the key service).


	Tom

From - Mon Feb  3 21:52:57 2003
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From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
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Hi Tony,

> > B. IDs should identify one thing only; they should not carry 
> > any embedded meaning or structure (eg 5th letter codes for 
> > the astronomer's gender preference). This is FATAL to any system.

> People, groups and communities won't be first registered in a Registry
> but in a Community Server (Community Name Server?) where they'll be
> assigned unique IDs created from the community namespace plus some
> community-specific identifier (eg //cas.le.ac.uk/TonyLinde).

This suggests some embedded structure ;-)  What do you see as the
purpose of the preceeding namespace.  Is it simply to avoid littering
a global namespace, or can you infer something more with cas.le.ac.uk?
Given that the ID is assigned by the registry, does this imply
something that the registry can do with the ID?

cheers,
Ray

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Hi Ray,


In general I think I agree with what you say below.
One thing that perhaps I should emphasize is that
what I'm calling a key is probably a more primitive
object that what you are calling an ID.  Key's can
be used to build ID's but can also be used in other contexts.

A key is no more than something which identifies an element
of a set.  One can build more complex structures out of this.
E.g., one might consider a SetTaggedKey which is a concatentation
of two keys: the key defining the set from which the key
was derived, and the individual tag within the set.
This would be the kind of self describing ID that you talk
of below (e.g., "//cas.le.ac.uk/TonyLinde").  But if I have 10^9
sources in my table, I'm unlikely to want to repeat the  40
byte VO table identfier all 10^9 times.  At least at the lowest
level I'll store the set name as metadata for the table and just the
individual identier inside the table.

This is a simple illustration of why I worry about defining
the concepts of identity too broadly.  Every context will
have different requirements that may mandate exactly what is
in the 'ID'.  I think we may want substantially more
detailed requirements on ID's in the context of data files and
observations that we necessarily do in terms of catalog table
rows.  E.g., I'm not sure that the issues regarding image formats
really have a counterpart for a catalog.

The discussions in these arenas may be clarified if we think in
terms of keys though.  E.g., we might mandate that data archives
return data indexed with observation SetTaggedKeys and that format
of the data is given as a separate key.  It would be up to the
user to decide whether they wished to consider the concatenation
of the observation and format as the fundamental key, or just
the observation itself.  We provide the user with sufficient
information to enable them to decide sameness, we don't make
that decision prematurely.  I'm not suggesting this particular
approach, just trying to show how the abstract keys can help us define
the registries.

Also, note that the keys aren't necessarily real software objects,
though I've tended to treat them as such.  We may simply have agreements
indicating UCDs for keys or some way of recognizing them.  The methods
I've ascribed to keys would then be implicit.

	Tom

Ray Plante wrote:
> I'm happy to see the international discussion picking up.  This message is 
> mainly about identifiers; however, I wanted to preface it with some 
> context about the discussion initiated within the NVO Metadata Working 
> Group.  While registries and the use of IDs are interdependent, I have 
> been trying to talk about them separately as we define the scope of the 
> problem we want to address (and hopefully bring some order to what 
> otherwise might be a random walk).  
> 
> On the ID side, I assembled some requirements for IDs from the many
> comments from the discussion 
> (http://rai.ncsa.uiuc.edu/~rplante/VO/metadata/oidreq.txt).  This 
> should looked at like a menu--pick the things you agree with.  Better yet: 
> indicate the things you don't agree with.  Requirements are generally 
> considered a good first step to design as it defines the scope of the 
> problem you are trying to solve.  As Andy implied, the requirements for 
> IVOA as a whole might be looser that what we specify for NVO.
> 
> This week, Tom shared should thoughtful comments about how we might
> approach IDs.  (He brought up the term "keys", by analogy to DBs; however,
> the term is synonymous.)  This message is an attempt to enunciate how his
> framework maps onto the requirements list--I hope Tom can comment on
> whether I got it right.  The main conclusion is that IDs are only used
> determine "sameness"; infering ownership or derivation directly from IDs
> is not to be required.
> 
>   1. Single Framework:  Okay 
> 
>   2. Determine "sameness" from 2 IDs:  Okay for the most part
> 	*  direct determination only possible when IDs have been issued by 
>            the same ID service.
>         *  cross-ID service comparison requires translation.  
> 	*  because data mirrors can reuse identifiers (req. 7), it is 
> 	   expected that the need for translation will be rare and
> 	   practically unnecessary.
> 
>   3. Avoiding needless duplication:  Okay (see notes above).
> 
>   4. Identifying different formats of same object:  Unspecified (No?)
>   
>   5. Identifying curator:  No
>         *  The ID is not necessarily issued by the curator.  However,
> 	   it is possible to retrieve this information by using the ID
> 	   to access the item's description.
> 
>      This might suggest a different requirement (which I've added):
> 
>        5.b.  It should be easy to identify the resource having issued the
> 	     identifier.
> 
>      This would allow one to get more information about the item
>      identified.  Note, however, that Tom's outline does not imply
>      this requirement (since one must query an ID service to determine
>      if it includes a particular ID).
> 
>      Another requirement I might add which was part of the registry
>      requirements:
> 
>        5.c  It should be possible to use the ID to access a unique
>             description of the item it identifies.
> 
>      That is, for any information you can't glean from an ID, you can
>      get from a description accessed with the ID.
> 
>   6. Collection membership:  No
> 
>   7. Reuse of IDs by mirrors:  Yes
> 
>   8. Derivation:  No
> 
>   9. Provider control over assignment:  Yes
>         *  Provider can run their own ID service.
> 
> Personally, I think this approach is about right in its scope.
> However, I think it would be useful if all you had was an ID, you
> could infer which service you could invoke to get more information
> about it.  As an example, if you have an ID, "//cas.le.ac.uk/TonyLinde", 
> you could go to "http://cas.le.ac.uk/getDescription?//cas.le.ac.uk/TonyLinde"
> and discover what this TonyLinde is and who takes care of it.  I also 
> think that we need to decide whether (for example) the same images in 
> different formats (e.g. as returned from an SIA image query) should have 
> the same ID.  
> 
> cheers,
> Ray
> 
> 
> 
> 
> 
> 


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Date: Mon, 3 Feb 2003 16:06:59 -0600 (CST)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: metadata@us-vo.org, <registry@ivoa.net>
Subject: Re: IDs and ID services
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On Mon, 3 Feb 2003, Tom McGlynn wrote:
> Key's can
> be used to build ID's but can also be used in other contexts.
> ...
> A key is no more than something which identifies an element
> of a set.  One can build more complex structures out of this.
> ...
> But if I have 10^9
> sources in my table, I'm unlikely to want to repeat the  40
> byte VO table identfier all 10^9 times.  

Ah, very good--I get it.  Very useful.  I think we can put this into a 
requirement.

As we talk about minimum interoperability requirements for the context of 
IVOA, we may find the need to segregate recommendations from requirements.

> It would be up to the
> user to decide whether they wished to consider the concatenation
> of the observation and format as the fundamental key, or just
> the observation itself.  We provide the user with sufficient
> information to enable them to decide sameness, we don't make
> that decision prematurely.  

I think in this example, the separation of these keys is appropriate.  My 
main concerns are:
  1.  The client needs to have a straight-forward, predictable way of 
      determining whether two objects are the same.  If an ID is formed by 
      combining keys, the client knows exactly where to get the keys 
      without knowing anything about the particular choices the provider 
      has made about what to give a key or what they represent.

  2.  The test for sameness enabled via IDs/keys is much easier/faster 
      than analyzing the specific metadata exactly.  This is not to say 
      that IDs encode all metadata information or that can cover all 
      interpretations of "sameness"; rather, for the most common cases 
      where a client might want to determine "sameness", an ID comparison 
      is useful as a first cut.

  3.  IDs can be used to obtain unique descriptions of things.  

I think a key-based approach as you describe it can address these 
concerns.

cheers,
Ray


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Date: Mon, 3 Feb 2003 15:19:32 -0600 (CST)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: Tony Linde <ael@star.le.ac.uk>
cc: registry@ivoa.net
Subject: Re: comments
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> Anyone want to start pumping in some requirements?

I've uploaded to the wiki site the working draft of requirements for 
registries now under discussion in the NVO MWG.  

cheers,
Ray


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Hi NVO-MWG-ers,

This week, I would very much like to wrap up the discussion on ID
requirments and scope, which will require a bit of focus during our
Thursday telecon.  The next step is to draw up a specification.  
Of course, comments are welcome throughout the prototypeing stage 
(including from the IVOA community).

Direct comment on the requirements have been sparse, so I'm going to
suggest my own evaluation of the list based on the discussion thus
far.  In short, I recommend restricting an ID's functions to testing
whether two identifiable objects are the same and to access unique
metadata descriptions of objects from a registry.  All other information
regarding the object (derivation, ownership, etc.) is obtained by
accessing the metadata descriptions.

In a bit more detail, the major changes I recommend to the requirements 
(refering to the latest version at
http://rai.ncsa.uiuc.edu/~rplante/VO/metadata/oidreq.txt) are:

  * ADD 1b: support a notion of local & global identifiers where
	local identifiers are unique only within a give context and
	global ones include a namespace.

  * DROP 5a in favor of 5b: 
        that is, a global ID is not required to identify the curating
        resource, but rather the resource that issued the ID.

  * ADD 5c: ID can be used to access unique descriptions of objects
        from a registry.

  * DROP 6: an ID for a data object is not required to indicate the
        collection it belongs to.

  * DROP 8: an ID for a data object is not required to indicate the
        collection it is derived from.  

There remains the issue of "sameness".  My suggestions for this will
appear in a subsequent message.

cheers,
Ray

From - Wed Feb  5 09:51:35 2003
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From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: metadata@us-vo.org
cc: registry@ivoa.net
Subject: On ID "sameness"
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Hi,

We still have this issue of "sameness": that is, when should two
instances of an object be consider the same, and thus be refered to by
the same identifier?  Reagan brought up the concept of a "semantic
copies", copies that are semantically the same but might have a
different byte-representation.  Tom indicated what might be considered
semantically equivalent might depend on the context; he suggested that
we should leave it up to the user to decide when objects are the same
rather than locking it in up front.  

Drawing on ideas presented earlier by others, I'd like to recommend
the following principles on defining "sameness".  They draw on the
requirements discussed in my previous message.

1. Two identifiers refer to the same thing when the identifiers are
   character-for-character identical.

2. Two local IDs are identical only when the context of the ID is the
   same.  Global IDs lock in a specific context, and thus can be
   compared in an absolute sense.

3. A description of a resource, service, or data collection might
   reference identifiers associated with various aspects of the
   subject.  Examples might include:
     *  observation ID
     *  "derived from" or "mirror of" ID.
     *  parent collection ID

4. When two instances of an object can be considered the same is up to
   the curating resource and will depend on the object being
   identified.  Curators should consider the following
   recommendations:
     * Two resources can be given the same ID if their
       descriptions are identical apart from the access point.
     * Two services can be given the same ID if:
         o  their descriptions are identical (including the interface
	    inputs and outputs) apart from the access point.
	 o  the implementaions are identical, or otherwise return
	    byte-for-byte output for any given set of inputs.  
     * Two data collections (i.e. anything that that is
       byte-instantiatable) can be given the same ID if they are
       byte-for-byte identical.
   It may be necessary to establish rules or conventions that control
   who is allowed to declare a "mirror" of something.  

5. Because an identifier can be assigned to a variety of things, be
   they abstract/virtual (e.g. resource IDs, observation IDs) or real
   byte-instantiatable (e.g. collection IDs), services that
   specify an ID as part of input or output should be very clear as to
   what the ID refers to (e.g. an image, a table row, an
   observation from which a data item is derived, etc.).  

   In particular with respect to data in a VOTable, it should maximize
   the reader's options for determining whether two rows are effectively
   the same for a particular purpose.  This will likely require of
   definitions of various ID UCDs.  

   One useful UCD might be one for a "semantic identifier", that
   refers to another data item that, in the eyes of the writer, a can
   be considered equivalent to the item being described.  This could
   be used by the SIA to group images that differ primarily in
   format.  

hope this helps,
Ray

From - Wed Feb  5 10:11:36 2003
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From: "Tony Linde" <ael@star.le.ac.uk>
To: "Ray Plante" <rplante@ncsa.uiuc.edu>, metadata@us-vo.org,
   registry@ivoa.net
Date: Wed, 05 Feb 2003 09:09:41 +0000
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Subject: Re: On ID "sameness"
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I still prefer an ID for any resource to be unique. I was thinking more
along the lines of a unique ID and some other field, like Reagan's
'semantic ID' being used for making two resources the 'same' (needs some
sort of naming standards).Then you have other fields to identify other
relationships. That said, I guess if we make the ID a semantic one, we
could have another 'Unique ID' field to uniquely identify a specific
resource.

Why do we need a unique ID? If you want to identify exactly which
resource was used - foir rerunning, debugging, etc. You might use the
semantic ID plus location identifier, but what if a location has six
copies of the same resource?

Cheers,
Tony.

On Wed, 5 Feb 2003 02:48:30 -0600 (CST), "Ray Plante"
<rplante@poplar.ncsa.uiuc.edu> said:
> Hi,
> 
> We still have this issue of "sameness": that is, when should two
> instances of an object be consider the same, and thus be refered to by
> the same identifier?  Reagan brought up the concept of a "semantic
> copies", copies that are semantically the same but might have a
> different byte-representation.  Tom indicated what might be considered
> semantically equivalent might depend on the context; he suggested that
> we should leave it up to the user to decide when objects are the same
> rather than locking it in up front.  
> 
> Drawing on ideas presented earlier by others, I'd like to recommend
> the following principles on defining "sameness".  They draw on the
> requirements discussed in my previous message.
> 
> 1. Two identifiers refer to the same thing when the identifiers are
>    character-for-character identical.
> 
> 2. Two local IDs are identical only when the context of the ID is the
>    same.  Global IDs lock in a specific context, and thus can be
>    compared in an absolute sense.
> 
> 3. A description of a resource, service, or data collection might
>    reference identifiers associated with various aspects of the
>    subject.  Examples might include:
>      *  observation ID
>      *  "derived from" or "mirror of" ID.
>      *  parent collection ID
> 
> 4. When two instances of an object can be considered the same is up to
>    the curating resource and will depend on the object being
>    identified.  Curators should consider the following
>    recommendations:
>      * Two resources can be given the same ID if their
>        descriptions are identical apart from the access point.
>      * Two services can be given the same ID if:
>          o  their descriptions are identical (including the interface
> 	    inputs and outputs) apart from the access point.
> 	 o  the implementaions are identical, or otherwise return
> 	    byte-for-byte output for any given set of inputs.  
>      * Two data collections (i.e. anything that that is
>        byte-instantiatable) can be given the same ID if they are
>        byte-for-byte identical.
>    It may be necessary to establish rules or conventions that control
>    who is allowed to declare a "mirror" of something.  
> 
> 5. Because an identifier can be assigned to a variety of things, be
>    they abstract/virtual (e.g. resource IDs, observation IDs) or real
>    byte-instantiatable (e.g. collection IDs), services that
>    specify an ID as part of input or output should be very clear as to
>    what the ID refers to (e.g. an image, a table row, an
>    observation from which a data item is derived, etc.).  
> 
>    In particular with respect to data in a VOTable, it should maximize
>    the reader's options for determining whether two rows are effectively
>    the same for a particular purpose.  This will likely require of
>    definitions of various ID UCDs.  
> 
>    One useful UCD might be one for a "semantic identifier", that
>    refers to another data item that, in the eyes of the writer, a can
>    be considered equivalent to the item being described.  This could
>    be used by the SIA to group images that differ primarily in
>    format.  
> 
> hope this helps,
> Ray
> 
> 
__
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 - IMAP accessible web-mail

From - Wed Feb  5 12:41:36 2003
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From: "Tony Linde" <ael@star.le.ac.uk>
To: "Clive Page" <cgp@star.le.ac.uk>, registry@ivoa.net, metadata@us-vo.org
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Subject: Re: Scope of registry
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Small point Clive: registry list address is 'registry@ivoa.net' and not
.org.

The point you raise is interesting and is on the border line between the
'minimal required' standards and the 'extensions' each registry might
implement. The ability to query what part of sky a resource (if it is
that type) covers is necessary; I'm not sure we need to standardise how
this is implemented.

> - We need a way to represent the shape of the field-of-view, some are

Agreed. Both in a query to the registry and in the results returned.

> - We need a way to gather the information from the individual archives: it
> may not be possible to do this by robot, it may need a human to get and
> convert the data to some uniform format (XML-based I'd guess).

It should be done by robot but it'll be up to each data centre to make it
available in one of a few standardly accessible ways: eg xml files in set
location, service with specific api.

> - The Registry will be quite a lot larger if it contains this
> information,
> so the design, even if it omits this type of data initially, must be
> suitable to scale to this size in due course.

This is definitely outwith the scope of IVOA standards: it'll be up to
individual projects to determine how to achieve this.

> So I would urge the Registry designers to consider providing this
> fine-grained information from the outset, if at all possible.

Again, there is no single Registry. Each project will implement this
facility in their own way. They need the ability to respond to
fine-grained queries but the project can decide for itself whether to
include this in their implementation of their registry or to farm such
queries out to the individual resources. AstroGrid will be fine-grained
but other projects may decide differently.

Cheers,
Tony.

On Wed, 5 Feb 2003 09:07:57 +0000 (GMT), "Clive Page" <cgp@star.le.ac.uk>
said:
> I've been visiting the NeSC in Edinburgh for the last few days so haven't
> had time to read all the Registry-related emails carefully, so apologise
> if this posting duplicates something already covered.  But most of the
> discussion I've seen is of computer science topics, and not much on
> scientific requirements.
> 
> It seems to me that one of the most valuable things the registry should
> do
> is to tell the astronomer about _all_ resources which potentially have
> information about some point (or small patch) in the sky - this is the
> obvious extensionh of the cone-search which is widely agreed to be a
> priority VO service.   The user wants to specify the name of an object,
> to
> be turned into coordinates by Simbad/NED, or an (RA,DEC) and perhaps a
> small radius, and be told where there are (or may be) useful information.
> In many (most?) cases the user will also restrict the query with a choice
> of waveband (tell me all radio observations for example) or a limit in
> say
> time of observations (all pre-outburst observations of this star).
> 
> For the well-known surveys this presents few problems, but there are lots
> of observatories which have observed the sky piece-meal.  Many of these
> have on-line observing logs.  For example you can search the archives of
> the HST, or Chandra, or XMM-Newton to see whether your bit of sky has
> ever
> been in their field of view.  This is also possible for many ground-based
> telescopes, and I guess all of them before long.  This information is at
> present obtainable only with great difficulty, as the archives are widely
> scattered with very diverse user interfaces.  In principle the Registry
> could make this _much_ easier.  I think we ought to aim to make this a
> practical reality.
> 
> There are some obvious difficulties:
> 
> - We need a way to represent the shape of the field-of-view, some are
> circular, some rectangular, or odd shaped (e.g. HST).  The data modelling
> people have discussed this, but not yet solved it.
> 
> - We need a way to gather the information from the individual archives:
> it
> may not be possible to do this by robot, it may need a human to get and
> convert the data to some uniform format (XML-based I'd guess).
> 
> - The Registry will be quite a lot larger if it contains this
> information,
> so the design, even if it omits this type of data initially, must be
> suitable to scale to this size in due course.
> 
> Although the difficulties of data gathering and implementation are
> non-trivial, I think they are tractable, and that the resulting gain in
> functionality for the astronomer-in-the-street would be considerable.  A
> registry which could provide this hard-to-get information would put the
> VO
> on the map as something actually useful (a lot of astronomers, at least
> in
> the UK, think the VO movement prettyn much a waste of time and money).
> So I would urge the Registry designers to consider providing this
> fine-grained information from the outset, if at all possible.
> 
> 
> -- 
> Clive Page,
> Dept of Physics & Astronomy,
> University of Leicester,    Tel +44 116 252 3551
> Leicester, LE1 7RH,  U.K.   Fax +44 116 252 3311
> 
> 
__
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 - Wed Feb  5 15:17:00 2003
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From: "Alex Szalay" <szalay@jhu.edu>
To: "Tony Linde" <ael@star.le.ac.uk>, "Clive Page" <cgp@star.le.ac.uk>,
   <registry@ivoa.net>, <metadata@us-vo.org>
Subject: RE: Scope of registry
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My 2 cents ---

I talked about this very briefly in Munich -- I think that the
field-of-view or footprint for any survey is a 'fractal', and
the answer depends on the context of the question. Take for example
the SDSS: the precise footprint is the union of 47 stripes, each
of them defined in their own spherical coordinate system, each
built from another 12 camcols, with some overlaps among them. If
we want to represent this in full precision, we need to define
47 speherical systems, and a complex union/intersection of 47*12
spherical rectangles, where some of the boundaries are small circles.
Add to this a bunch of excised areas, like areas of poor seeing,
regions around bright starts, geostationary satellites, metorites,
and we are talking about thousands of spherical polygons for a
precise definition. To provide this whole information is always an
overkill.

I can think of three different contexts one wants footprint info:

(i) whole sky  -- here we do not care about the full complexity
	of the footprint, for SDSS it would be enough to say that
	gb>30 and the 3 southern stripes
(ii) on 6-10 degree scales -- here we hand an area definition, and
	ask for its intersection with the survey outline
(iii) less than a degree scales -- here again we pass an area definition
	and we request the precise intersection with the area

Here (ii) and (iii) are similar, but not identical: (ii) would still
return an approximate answer, while (iii) would always return the precise
one. I envisage a heuristic simplification (optional) of the boundaries
for (ii), so that we never return more than ~20 spherical polygons
to characterize the footprint.

These can be easily implemented as a simple web service, with two
functions:

(i):     AREA footprint(void);
(ii)-(iii)	AREA intersect(AREA in_area, float tolerance)
	or AREA intersect(AREA in_area, int npoly)

where the tolerance or npoly determine the level of approximation.
The AREA is a representation of an arbitrarily complex region of the
sky, I presume in terms of spherical polygons.

We do need to use extended spherical polygons -- using only great
circles as arcs is not going to be good enough to represent drift
scan surveys, like the SDSS, where the camera sweeps an approximately
cylindrical surface. We do need to allow for arcs which are small
circles.

This is the reason why in the SDSS we started to use 3d Cartesian
representations of polygons. Every edge of a spherical polygon is
represented by a 4-vector, describing the equation of a plane in 3D.
The edge is the intersection of the plane  with the unit sphere. The
Cartesian coordinate system is tied to J2000 ICRS. This has the
advantage that all the boundaries of the SDSS stripes for example
can be cleanly represented this way, without having to introduce new
spherical coordinate systems for each.

The 4-vector is (cx,cy,cz,d). Here (cx,cy,cz) form a 3D normal unit
vector of the plane, and the d is the offset from the center along
the normal. Thus great circles have always d=0. An intersection of
N such planes forms a CONVEX, this is a convex polyhedron in the 3D
sense, and the union of CONVEXes form a DOMAIN. These names are
lifted from computational geometry.

DOMAIN := DOMAIN OR CONVEX
DOMAIN := DOMAIN OR DOMAIN
CONVEX := CONVEX AND CONVEX
CONVEX := CONVEX AND EDGE

A cone search is a single constraint, where cx,cy,cz point to the
center, and d=cos(radius).

Note, that this is a pure, and rather abstract notation, independent
from our HTM library, which performs a particular "rendering" of the
sky in terms of spherical triangles, and can compute the set of
covering triangles for an AREA defined this way.

I would like this definitions of an AREA be considered for the data
model because I think that they represent an extremely flexible way
the describe region or areas on the sky, from hundreds of degrees in
size to milliarcesonds.

Cheers, Alex

-----Original Message-----
From: owner-metadata@us-vo.org [mailto:owner-metadata@us-vo.org]On
Behalf Of Tony Linde
Sent: Wednesday, February 05, 2003 6:40 AM
To: Clive Page; registry@ivoa.net; metadata@us-vo.org
Subject: Re: Scope of registry


Small point Clive: registry list address is 'registry@ivoa.net' and not
.org.

The point you raise is interesting and is on the border line between the
'minimal required' standards and the 'extensions' each registry might
implement. The ability to query what part of sky a resource (if it is
that type) covers is necessary; I'm not sure we need to standardise how
this is implemented.

> - We need a way to represent the shape of the field-of-view, some are

Agreed. Both in a query to the registry and in the results returned.

> - We need a way to gather the information from the individual archives: it
> may not be possible to do this by robot, it may need a human to get and
> convert the data to some uniform format (XML-based I'd guess).

It should be done by robot but it'll be up to each data centre to make it
available in one of a few standardly accessible ways: eg xml files in set
location, service with specific api.

> - The Registry will be quite a lot larger if it contains this
> information,
> so the design, even if it omits this type of data initially, must be
> suitable to scale to this size in due course.

This is definitely outwith the scope of IVOA standards: it'll be up to
individual projects to determine how to achieve this.

> So I would urge the Registry designers to consider providing this
> fine-grained information from the outset, if at all possible.

Again, there is no single Registry. Each project will implement this
facility in their own way. They need the ability to respond to
fine-grained queries but the project can decide for itself whether to
include this in their implementation of their registry or to farm such
queries out to the individual resources. AstroGrid will be fine-grained
but other projects may decide differently.

Cheers,
Tony.

On Wed, 5 Feb 2003 09:07:57 +0000 (GMT), "Clive Page" <cgp@star.le.ac.uk>
said:
> I've been visiting the NeSC in Edinburgh for the last few days so haven't
> had time to read all the Registry-related emails carefully, so apologise
> if this posting duplicates something already covered.  But most of the
> discussion I've seen is of computer science topics, and not much on
> scientific requirements.
>
> It seems to me that one of the most valuable things the registry should
> do
> is to tell the astronomer about _all_ resources which potentially have
> information about some point (or small patch) in the sky - this is the
> obvious extensionh of the cone-search which is widely agreed to be a
> priority VO service.   The user wants to specify the name of an object,
> to
> be turned into coordinates by Simbad/NED, or an (RA,DEC) and perhaps a
> small radius, and be told where there are (or may be) useful information.
> In many (most?) cases the user will also restrict the query with a choice
> of waveband (tell me all radio observations for example) or a limit in
> say
> time of observations (all pre-outburst observations of this star).
>
> For the well-known surveys this presents few problems, but there are lots
> of observatories which have observed the sky piece-meal.  Many of these
> have on-line observing logs.  For example you can search the archives of
> the HST, or Chandra, or XMM-Newton to see whether your bit of sky has
> ever
> been in their field of view.  This is also possible for many ground-based
> telescopes, and I guess all of them before long.  This information is at
> present obtainable only with great difficulty, as the archives are widely
> scattered with very diverse user interfaces.  In principle the Registry
> could make this _much_ easier.  I think we ought to aim to make this a
> practical reality.
>
> There are some obvious difficulties:
>
> - We need a way to represent the shape of the field-of-view, some are
> circular, some rectangular, or odd shaped (e.g. HST).  The data modelling

> people have discussed this, but not yet solved it.
>
> - We need a way to gather the information from the individual archives:
> it
> may not be possible to do this by robot, it may need a human to get and
> convert the data to some uniform format (XML-based I'd guess).
>
> - The Registry will be quite a lot larger if it contains this
> information,
> so the design, even if it omits this type of data initially, must be
> suitable to scale to this size in due course.
>
> Although the difficulties of data gathering and implementation are
> non-trivial, I think they are tractable, and that the resulting gain in
> functionality for the astronomer-in-the-street would be considerable.  A
> registry which could provide this hard-to-get information would put the
> VO
> on the map as something actually useful (a lot of astronomers, at least
> in
> the UK, think the VO movement prettyn much a waste of time and money).
> So I would urge the Registry designers to consider providing this
> fine-grained information from the outset, if at all possible.
>
>
> --
> Clive Page,
> Dept of Physics & Astronomy,
> University of Leicester,    Tel +44 116 252 3551
> Leicester, LE1 7RH,  U.K.   Fax +44 116 252 3311
>
>
__
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 - The professional email service

From - Wed Feb  5 15:26:21 2003
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From: "Alex Szalay" <szalay@jhu.edu>
To: "Alex Szalay" <szalay@jhu.edu>, "Tony Linde" <ael@star.le.ac.uk>,
   "Clive Page" <cgp@star.le.ac.uk>, <registry@ivoa.net>, <metadata@us-vo.org>
Subject: RE: Scope of registry-- one more thing
Date: Wed, 5 Feb 2003 09:23:38 -0500
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Status:   

One more thought added/left out:

the intersect function can then be called recursively, if
we do a cross-match among multiple surveys. The final result
is the common area of all the surveys inside the initial
are specified.

Metacode in quasi-C:

AREA aa = ".....";

aa = survey1.intersect(aa,20);
aa = survey2.intersect(aa,20);
aa = survey3.intersect(aa,20);

now aa has the common area of the initial aa and the three
surveys, with our given tolerance.

Cheers, Alex

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From: Arnold Rots <arots@head-cfa.cfa.harvard.edu>
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Message-Id: <200302051542.h15FgvF05186@xebec.cfa.harvard.edu>
Subject: Re: On ID "sameness"
In-Reply-To: <Pine.LNX.4.44.0302050225260.23007-100000@poplar.ncsa.uiuc.edu>
To: Ray Plante <rplante@ncsa.uiuc.edu>
Date: Wed, 5 Feb 2003 10:42:57 -0500 (EST)
CC: metadata@us-vo.org, registry@ivoa.net
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Status:   

I am still uneasy with the requirements document.  In trying to be
very general, it appears to gloss over a number of differences that
may be fundamental.  The problem, in my mind, is that the properties
of the ID (in being able to convey certain attributes of a particular
instance of an object) take on different meaning, depending on what
kind of object one is talking about.

The ID is supposed to identify an object; and an object can be many
things: a collection of observations, a single observation, a
collection of files, or a single file.

One problem I see is that sameness does not apply equally to these
different types of objects.  There is no point in talking about two
observations being byte-for-byte identical; two IDs might refer to the
same observation (whether that's a sensible thing is another issue),
but if one views an observation as a collection of files derived from
or associated with that observation, the two collections may not
necessarily contain the same files.  Yet, they represent one identical
observation.

If we talk about single file objects, the answers are easy: take the
filename as identifier - that should include information on format and
version, assuming that all filenames in a depository are unique.

But when talking about file collections, it gets more complicated.
"The current default package of primary products"  is a something that
does not really have a version attached to it, or a format.  It
contains files that have a version and a format, but this particular
package may contain different mixes at different times.
Maybe the format could be "primary data products package", but that is
a vague concept that is very different from a universally understood
format like jpeg.  And maybe its assembly date could be taken as a
version, but that says nothing about two instances of its being
byte-for-byte identical.

I am not sure I am putting this very clearly, but I guess I am still
not convinced that we can specify a one-size-fits-all ID to label
everything in the universe, especially when that labeling is to
include certain properties that are not necessarily shared by all
those "things".

  - Arnold

Ray Plante wrote:
> Hi,
> 
> We still have this issue of "sameness": that is, when should two
> instances of an object be consider the same, and thus be refered to by
> the same identifier?  Reagan brought up the concept of a "semantic
> copies", copies that are semantically the same but might have a
> different byte-representation.  Tom indicated what might be considered
> semantically equivalent might depend on the context; he suggested that
> we should leave it up to the user to decide when objects are the same
> rather than locking it in up front.  
> 
> Drawing on ideas presented earlier by others, I'd like to recommend
> the following principles on defining "sameness".  They draw on the
> requirements discussed in my previous message.
> 
> 1. Two identifiers refer to the same thing when the identifiers are
>    character-for-character identical.
> 
> 2. Two local IDs are identical only when the context of the ID is the
>    same.  Global IDs lock in a specific context, and thus can be
>    compared in an absolute sense.
> 
> 3. A description of a resource, service, or data collection might
>    reference identifiers associated with various aspects of the
>    subject.  Examples might include:
>      *  observation ID
>      *  "derived from" or "mirror of" ID.
>      *  parent collection ID
> 
> 4. When two instances of an object can be considered the same is up to
>    the curating resource and will depend on the object being
>    identified.  Curators should consider the following
>    recommendations:
>      * Two resources can be given the same ID if their
>        descriptions are identical apart from the access point.
>      * Two services can be given the same ID if:
>          o  their descriptions are identical (including the interface
> 	    inputs and outputs) apart from the access point.
> 	 o  the implementaions are identical, or otherwise return
> 	    byte-for-byte output for any given set of inputs.  
>      * Two data collections (i.e. anything that that is
>        byte-instantiatable) can be given the same ID if they are
>        byte-for-byte identical.
>    It may be necessary to establish rules or conventions that control
>    who is allowed to declare a "mirror" of something.  
> 
> 5. Because an identifier can be assigned to a variety of things, be
>    they abstract/virtual (e.g. resource IDs, observation IDs) or real
>    byte-instantiatable (e.g. collection IDs), services that
>    specify an ID as part of input or output should be very clear as to
>    what the ID refers to (e.g. an image, a table row, an
>    observation from which a data item is derived, etc.).  
> 
>    In particular with respect to data in a VOTable, it should maximize
>    the reader's options for determining whether two rows are effectively
>    the same for a particular purpose.  This will likely require of
>    definitions of various ID UCDs.  
> 
>    One useful UCD might be one for a "semantic identifier", that
>    refers to another data item that, in the eyes of the writer, a can
>    be considered equivalent to the item being described.  This could
>    be used by the SIA to group images that differ primarily in
>    format.  
> 
> hope this helps,
> Ray
> 
--------------------------------------------------------------------------
Arnold H. Rots                                Chandra X-ray Science Center
Smithsonian Astrophysical Observatory                tel:  +1 617 496 7701
60 Garden Street, MS 67                              fax:  +1 617 495 7356
Cambridge, MA 02138                             arots@head-cfa.harvard.edu
USA                                     http://hea-www.harvard.edu/~arots/
--------------------------------------------------------------------------

From - Wed Feb  5 16:51:37 2003
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Date: Wed, 5 Feb 2003 09:50:07 -0600 (CST)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: Tony Linde <ael@star.le.ac.uk>
cc: metadata@us-vo.org, <registry@ivoa.net>
Subject: Re: On ID "sameness"
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Hi Tony,

On Wed, 5 Feb 2003, Tony Linde wrote:
> I still prefer an ID for any resource to be unique. I was thinking more
> along the lines of a unique ID and some other field, like Reagan's
> 'semantic ID' being used for making two resources the 'same' (needs some
> sort of naming standards).Then you have other fields to identify other
> relationships. That said, I guess if we make the ID a semantic one, we
> could have another 'Unique ID' field to uniquely identify a specific
> resource.

So, are you saying that we would need to make a distinction between a 
'semantic id' and an 'instance id', where the latter points to a 
particular copy?

If so, I think this is largely consistent with my suggestions (or at least
we can adjust the suggestions accordingly).  In my mind, a 'semantic id'
should be considered a piece of metadata of something identified with an
'instance id': the former says, this instance is semantically the same as
another object.

A semantic id, however, should probably not be a static or permanent 
characteristic of an object since (as Tom pointed out) this may depend on 
the application.  Rather, its an association made within a particular 
application.  As an example, the SIA could specify that one of the columns 
in the VOTable returned by an image query be a semantic ID that is the 
same for all images (i.e. rows) that differ only in their format (and 
access URL).  This ID could be equivalent to the instance ID of one of the 
images in the group.  

One possible inconsistancy is in my point 4 in which I suggest that a 
mirror copy of something can have the same ID.  This would prevent 
an application from making a distinction between copies of dataset, say, 
in a derivation history of derived product.  Perhaps this should be 
handled in an analogous way: copies have different instance IDs but can 
have a 'reference ID' that is the same.  Recommendation for 
forming an instance ID from a reference ID might be appropriate.  Do you 
think this is a prefered way to go?  

On the con side is the case for dynamically generated data (e.g.  
mosaics) which may be different over time for a given set of inputs
because the algorithm changes.  In this case, an instance ID may not be
much use.  The possible solution is to say that instance IDs should not be
required in all cases; in particular, standard services (e.g. SIA) should 
avoid requiring them.  Or we do away with the concept of instance ID 
altogether: if you want to describe the copy you have, you go to the 
metadata describing origin.  

thoughts?
Ray
 


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From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
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To: Arnold Rots <arots@head-cfa.cfa.harvard.edu>
cc: metadata@us-vo.org, <registry@ivoa.net>
Subject: Re: On ID "sameness"
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Hi Arnold,

Thanks for your comments.  I recognize that sameness will depend on (1) 
the type of object be identified, and (2) the needs of a particular 
application.  My answer to this was that (1) it would be up to the 
curator to decide when two things are the same apart from its location, 
and (2) standard interfaces should be specific about what kind of ID 
should be given/returned.  

So, my question now is, what would suggest as an answer to how we use IDs?  
Should we:
  A.  Drop the concept of IDs altogether?
  B.  Restrict IDs to refering to explicitly registered descriptions? 
	(Some other mechanism would be necessary for identifying different 
         formats of the same image in the SIA image query results.)
  C.  Go with a variation on the requirements and guidelines on "sameness" 
        that I suggested?
  D.  Something else entirely?

cheers,
Ray

From - Wed Feb  5 18:06:36 2003
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From: "Roy Williams" <roy@cacr.caltech.edu>
To: <metadata@us-vo.org>
Cc: <registry@ivoa.net>
Subject: Re: On ID "sameness"
Date: Wed, 5 Feb 2003 09:02:08 -0800
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Perhaps we could ask how to assign ID's to the Cone Seraches that have been
registered (http://voservices.org/cone/register/showlist.asp).

The answer is obvious -- it is the person who sets up the registry. He can
use a sequence of numbers, a hash from the metadata, or name them after his
favorite Greek Gods. I name this Cone Search "Zeus". IMHO, we (the VO
community) are NOT in a position to influence this choice, it is made by
repository owners.

Our role, however, is to "globalize" the choice that was made, by providing
a namespace for the chosen identifiers. This could be assigned by the NVO
project, perhaps "CSReg". To get this identifier of a repository from NVO,
there must be documents explaining what is meant by this identifier
(documents, WSDL, OAI information, etc etc).  Similarly, NVO is registered
with IVOA as a repository of astronomical information.

Thus the global ID is a sequence of tokens of decreasing scope, each dreamed
up by a different person/committee, and each token has an implied
documentation bundle that goes with it. For example
    IVOA:NVO:CSReg:Zeus

Therefore I believe the ID question devolves to a question of what
documentation bundle goes with one of the tokens.

"Sameness" is a matter of compring ID strings. If they are different, we
must look to their metatdata for any possible relationships. We should not
overload our ID with extra stuff and try to be all things to all people.

Roy



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

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Subject: Re: On ID "sameness"
In-Reply-To: <0c7601c2cd38$519754d0$6b91d783@cacr.caltech.edu>
To: Roy Williams <roy@cacr.caltech.edu>
Date: Wed, 5 Feb 2003 12:05:41 -0500 (EST)
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I would have thought that one must look at the metadata for any
possible relationships when the IDs are _the same_.

  - Arnold

Roy Williams wrote:
> 
> "Sameness" is a matter of compring ID strings. If they are different, we
> must look to their metatdata for any possible relationships. We should not
> overload our ID with extra stuff and try to be all things to all people.
> 
> Roy
> 
> 
> 
> --------
> Caltech Center for Advanced Computing Research
> roy@cacr.caltech.edu
> 626 395 3670
> 
--------------------------------------------------------------------------
Arnold H. Rots                                Chandra X-ray Science Center
Smithsonian Astrophysical Observatory                tel:  +1 617 496 7701
60 Garden Street, MS 67                              fax:  +1 617 495 7356
Cambridge, MA 02138                             arots@head-cfa.harvard.edu
USA                                     http://hea-www.harvard.edu/~arots/
--------------------------------------------------------------------------

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From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: Roy Williams <roy@cacr.caltech.edu>
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Subject: Re: On ID "sameness"
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> Therefore I believe the ID question devolves to a question of what
> documentation bundle goes with one of the tokens.
> 
> "Sameness" is a matter of compring ID strings. If they are different, we
> must look to their metatdata for any possible relationships. We should not
> overload our ID with extra stuff and try to be all things to all people.

The question then is, under what circumstances should two things (or two 
references to things) be refered to by identical IDs?  I would infer from 
your discussion that it mean that the two things have identical 
documentation bundles associated with it.  Yes?

cheers,
Ray


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Subject: Re: On ID "sameness"
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To: Ray Plante <rplante@ncsa.uiuc.edu>
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Ray Plante wrote:
> > Therefore I believe the ID question devolves to a question of what
> > documentation bundle goes with one of the tokens.
> > 
> > "Sameness" is a matter of compring ID strings. If they are different, we
> > must look to their metatdata for any possible relationships. We should not
> > overload our ID with extra stuff and try to be all things to all people.
> 
> The question then is, under what circumstances should two things (or two 
> references to things) be refered to by identical IDs?  I would infer from 
> your discussion that it mean that the two things have identical 
> documentation bundles associated with it.  Yes?

Nah, not really, I think, because it depends on the specification of
what needs to be included in the bundle: if you have a gif and a jpeg
image that represent the same scene, should their documentation
bundles be expected to include a description of their graphical
formats?

  - Arnold

> 
> cheers,
> Ray
> 
> 
--------------------------------------------------------------------------
Arnold H. Rots                                Chandra X-ray Science Center
Smithsonian Astrophysical Observatory                tel:  +1 617 496 7701
60 Garden Street, MS 67                              fax:  +1 617 495 7356
Cambridge, MA 02138                             arots@head-cfa.harvard.edu
USA                                     http://hea-www.harvard.edu/~arots/
--------------------------------------------------------------------------

From - Wed Feb  5 18:56:36 2003
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From: Clive Page <cgp@star.le.ac.uk>
To: Arnold Rots <arots@head-cfa.cfa.harvard.edu>
cc: registry@ivoa.net, <metadata@us-vo.org>
Subject: Re: Scope of registry
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On Wed, 5 Feb 2003, Arnold Rots wrote:

> At issue is the question how "potentially" should be defined.

Just to clarify one point arising from Alex Szalay's comments and yours -
I don't think it is necessary for detailed information to be held in the
Registry, as the best answer the Registry can give the user as to whether
a given resource has the required information are just

 - no
 - maybe

(because the answer "yes" implies a degree of certainty which the
Registry, with its somewhat high-level view of metadata, can never have).

So the spatial information in the Registry does not need to be concerned
with exact edges, or chip boundaries, or other fine details, just enough
to know whether the field was probably covering the (RA,DEC) of interest.

It would still be useful to know whether one was within the typical field
radius of the centre of some HST observation (if one were interested in


-- 
Clive Page,
Dept of Physics & Astronomy,
University of Leicester,    Tel +44 116 252 3551
Leicester, LE1 7RH,  U.K.   Fax +44 116 252 3311

From - Wed Feb  5 18:41:37 2003
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Subject: identifiers in grids
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The question of identifiers can be subsumed within the larger 
challenge of maintaining consistent naming conventions across 
federations of collections.

Data grids use a logical name space to define global identifiers. 
Each type of physical resource is typically named by a separate 
logical name space:
- files, named within a replica catalog or SRB MCAT catalog
- physical resources, within a grid metadata directory service, or SRB MCAT
- users, named within a certificate authority
- access controls, managed by a community authorization server, or SRB MCAT

Each grid service corresponds to mapping of distributed state 
information to the appropriate logical name space managed in the 
appropriate registry.

Management of consistency across grid services corresponds to 
constraints that are imposed on the mappings.

A simple example is management of access controls on data that is 
aggregated into a container and replicated across multiple systems 
(including compound resources).  In the SRB environment, the 
following distributed state information is managed across multiple 
services for this capability:
- mapping is established between user identity and the SRB name for 
the user through an authentication service
- mapping is established between SRB user name and access control 
lists for each digital entity registered into a SRB collection
- mapping is established between logical file name and a container 
that holds the file
- mapping is established between the container and the physical 
resource that has the desired replica of the container
- mapping is maintained of the presence of the replica on the disk 
front end to the back end tape within a compound resource

These mappings require additional state information for enforcing 
locks on writes, and synchronization across replica sites after 
writes complete.

Access control to the physical digital entity requires the exercise 
of all of these mappings in the correct order.

The issue of identifiers is intricately intertwined with the mappings 
that are imposed on the identifiers.  The infrastructure that manages 
the mappings can also be applied to create digital libraries (mapping 
of descriptive metadata to the logical name space), and persistent 
archives (mapping of authenticity information to the logical name 
space).

Reagan Moore

From - Wed Feb  5 19:14:11 2003
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From: "Alex Szalay" <szalay@jhu.edu>
To: "Clive Page" <cgp@star.le.ac.uk>,
   "Arnold Rots" <arots@head-cfa.cfa.harvard.edu>
Cc: <registry@ivoa.net>, <metadata@us-vo.org>
Subject: RE: Scope of registry
Date: Wed, 5 Feb 2003 13:10:26 -0500
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Thanks for comment -- I fully agree. Which brings up the need of
(possibly) a third method, that of survey.contains(POINT p).

This could either return a TRUE/FALSE, or even a fuzzy number for 
a redshift survey (see 2dF), equal to the sampling probability.


Cheers, ALex

-----Original Message-----
From: owner-metadata@us-vo.org [mailto:owner-metadata@us-vo.org]On
Behalf Of Clive Page
Sent: Wednesday, February 05, 2003 12:49 PM
To: Arnold Rots
Cc: registry@ivoa.net; metadata@us-vo.org
Subject: Re: Scope of registry


On Wed, 5 Feb 2003, Arnold Rots wrote:

> At issue is the question how "potentially" should be defined.

Just to clarify one point arising from Alex Szalay's comments and yours -
I don't think it is necessary for detailed information to be held in the
Registry, as the best answer the Registry can give the user as to whether
a given resource has the required information are just

 - no
 - maybe

(because the answer "yes" implies a degree of certainty which the
Registry, with its somewhat high-level view of metadata, can never have).

So the spatial information in the Registry does not need to be concerned
with exact edges, or chip boundaries, or other fine details, just enough
to know whether the field was probably covering the (RA,DEC) of interest.

It would still be useful to know whether one was within the typical field
radius of the centre of some HST observation (if one were interested in


-- 
Clive Page,
Dept of Physics & Astronomy,
University of Leicester,    Tel +44 116 252 3551
Leicester, LE1 7RH,  U.K.   Fax +44 116 252 3311

From - Wed Feb  5 19:56:36 2003
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Subject: Re: Scope of registry
In-Reply-To: <Pine.GSO.4.44L0.0302051741250.8207-100000@sparky.star.le.ac.uk>
To: Clive Page <cgp@star.le.ac.uk>
Date: Wed, 5 Feb 2003 13:55:00 -0500 (EST)
CC: Arnold Rots <arots@head-cfa.cfa.harvard.edu>, registry@ivoa.net,
   metadata@us-vo.org
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So, it becomes a matter of degree.
I would argue, for the sake of simplicity of the registry, that it
contain a single "record" per resource, rather than a record plus a
full catalog of observations.  In my mind, that part of the query
should be posed to the resource itself, especially since it is already
implied in the full query that goes in that direction anyway.
It also removes the necessity of making sure that the registry is
continuously updated with new observations.

  - Arnold

Clive Page wrote:
> On Wed, 5 Feb 2003, Arnold Rots wrote:
> 
> > At issue is the question how "potentially" should be defined.
> 
> Just to clarify one point arising from Alex Szalay's comments and yours -
> I don't think it is necessary for detailed information to be held in the
> Registry, as the best answer the Registry can give the user as to whether
> a given resource has the required information are just
> 
>  - no
>  - maybe
> 
> (because the answer "yes" implies a degree of certainty which the
> Registry, with its somewhat high-level view of metadata, can never have).
> 
> So the spatial information in the Registry does not need to be concerned
> with exact edges, or chip boundaries, or other fine details, just enough
> to know whether the field was probably covering the (RA,DEC) of interest.
> 
> It would still be useful to know whether one was within the typical field
> radius of the centre of some HST observation (if one were interested in
> 
> 
> -- 
> Clive Page,
> Dept of Physics & Astronomy,
> University of Leicester,    Tel +44 116 252 3551
> Leicester, LE1 7RH,  U.K.   Fax +44 116 252 3311
> 
--------------------------------------------------------------------------
Arnold H. Rots                                Chandra X-ray Science Center
Smithsonian Astrophysical Observatory                tel:  +1 617 496 7701
60 Garden Street, MS 67                              fax:  +1 617 495 7356
Cambridge, MA 02138                             arots@head-cfa.harvard.edu
USA                                     http://hea-www.harvard.edu/~arots/
--------------------------------------------------------------------------

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Subject: Re: On ID "sameness"
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To: Ray Plante <rplante@ncsa.uiuc.edu>
Date: Wed, 5 Feb 2003 14:53:32 -0500 (EST)
CC: Arnold Rots <arots@head-cfa.cfa.harvard.edu>, metadata@us-vo.org,
   registry@ivoa.net
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I think I'm seeing the light.
The solution may lie in imposing a logical mapping between objects,
name spaces, and IDs, leaving that mapping up to the issuer of the
object.  As far as I am concerned we can equate name spaces and IDs.
But it does require a fully hierarchical object space.

For the Chandra archive:
We get assigned, say, ID="SAO" for the name space of archives at SAO.
Then here is our ID hierarchy:

Object/namespace    ID

SAO                 SAO
Chandra archive     SAO:CDA
Chandra mission     SAO:CDA:CXO
Observation 2000    SAO:CDA:CXO:2000
Primary package     SAO:CDA:CXO:2000:primary
Event list          SAO:CDA:CXO:2000:primary:acisf02000N001_evt.fits
FITS hi_res image   SAO:CDA:CXO:2000:primary:acisf02000N001_cntr_img2.fits
Jpeg hi_res image   SAO:CDA:CXO:2000:primary:acisf02000N001_cntr_img2.jpg

Since we are the issuing authority of the CXO name space, you can take
any two IDs that contain the substring CXO: and compare the
remainders.  As far into those remainders as they are identical there
is sameness, but you would probably have to look at the metadata to
determine the degree of sameness.  For instance, CXO:2000 in
NASA:HEASARC:CXO:2000 and SAO:CDA:CXO:2000 indicate that we are
pointing to the same observation

In the above example, the
remainders in the last three items are:
2000:primary:acisf02000N001_evt.fits
2000:primary:acisf02000N001_cntr_img2.fits
2000:primary:acisf02000N001_cntr_img2.jpg
The first and second are identical through 2000:primary:acisf02000N001_
Which means basically the same data and the same version (N001), but
in different data types (event list and image).
The second and third are identical through
2000:primary:acisf02000N001_cntr_img2.
which means (though it does not say that) that the jpg is derived from
the fits, representing the same image.

Now, in principle one could make sameness more explicit by changing:
SAO:CDA:CXO:2000:primary:acisf02000N001_cntr_img2.fits
to:
SAO:CDA:CXO:2000:primary:acis:N001:img:cntr:fits
Institution:archive:mission:obsid:datapackage:instrument:version:datatype:subtype:format
but that gets very detailed and, besides,
acisf02000N001_cntr_img2.fits happens to be a unique filename.
I have to admit, though, that it chopping the name up provides a more
general mechanism for judging sameness.


I admit that this is more of a use case than a requirements
discussion.  But I think it clarifies a number of things.
As I said at the beginning, I would suggest that:
1. We assume/require a one-to-one logical mapping between objects,
name spaces, and IDs
2. The object (ns, ID) space be strictly hierarchical
3. The issuer of objects in a given name space be responsible for
issuing authoritative IDs

The remaining question is whether there should be rules that govern
the hierarchy of IDs within an issuer's name space: should there be a
list of required ID elements (when applicable) such as instrument,
version, datatype, format in the example I gave.

  - Arnold

Ray Plante wrote:
> Hi Arnold,
> 
> Thanks for your comments.  I recognize that sameness will depend on (1) 
> the type of object be identified, and (2) the needs of a particular 
> application.  My answer to this was that (1) it would be up to the 
> curator to decide when two things are the same apart from its location, 
> and (2) standard interfaces should be specific about what kind of ID 
> should be given/returned.  
> 
> So, my question now is, what would suggest as an answer to how we use IDs?  
> Should we:
>   A.  Drop the concept of IDs altogether?
>   B.  Restrict IDs to refering to explicitly registered descriptions? 
> 	(Some other mechanism would be necessary for identifying different 
>          formats of the same image in the SIA image query results.)
>   C.  Go with a variation on the requirements and guidelines on "sameness" 
>         that I suggested?
>   D.  Something else entirely?
> 
> cheers,
> Ray
> 
--------------------------------------------------------------------------
Arnold H. Rots                                Chandra X-ray Science Center
Smithsonian Astrophysical Observatory                tel:  +1 617 496 7701
60 Garden Street, MS 67                              fax:  +1 617 495 7356
Cambridge, MA 02138                             arots@head-cfa.harvard.edu
USA                                     http://hea-www.harvard.edu/~arots/
--------------------------------------------------------------------------

From - Wed Feb  5 22:11:36 2003
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Date: Wed, 5 Feb 2003 15:07:06 -0600 (CST)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: Arnold Rots <arots@head-cfa.cfa.harvard.edu>
cc: metadata@us-vo.org, <registry@ivoa.net>
Subject: Re: On ID "sameness"
In-Reply-To: <200302051953.h15JrWu05413@xebec.cfa.harvard.edu>
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Hey Arnold,

> I think I'm seeing the light.
> The solution may lie in imposing a logical mapping between objects,
> name spaces, and IDs, leaving that mapping up to the issuer of the
> object.  

Cool.  I think we're on the same page there.

> As far as I am concerned we can equate name spaces and IDs.
> But it does require a fully hierarchical object space.
> 
> I admit that this is more of a use case than a requirements
> discussion.  But I think it clarifies a number of things.

(Hey, use cases were called for as well!)

I agree.  I, too, concluded that a hierarchical space would be helpful.  
(I've been thinking about a form based on the URI standard; however, the 
functionality is identical to your examples.  No matter--just an 
implementation detail.)

> As far into those remainders as they are identical there
> is sameness, but you would probably have to look at the metadata to
> determine the degree of sameness.  For instance, CXO:2000 in
> NASA:HEASARC:CXO:2000 and SAO:CDA:CXO:2000 indicate that we are
> pointing to the same observation

I think this is a repeat of what you just said, but I would that one would 
have to look at the metadata for NASA:HEASARC:CXO:2000 to know that it 
refers to the same observation as SAO:CDA:CXO:2000 as there is no a priori 
way of knowing that those common parts are intentional or accidental.  

> As I said at the beginning, I would suggest that:
> 1. We assume/require a one-to-one logical mapping between objects,
> name spaces, and IDs
> 2. The object (ns, ID) space be strictly hierarchical
> 3. The issuer of objects in a given name space be responsible for
> issuing authoritative IDs

I agree with all three of these.  Strictly speaking, I see 2. as a 
technical choice that should be motivated by some required functionality.  
The functionality you describe (I think) is the ability to determine in 
one object logically contains another.  Personally, I motivate a hierarchy 
by the need to be able to access descriptions of objects from an ID.  It 
is likely that a description may not be explicitly available for all 
objects that are assigned an ID; however, if we require that a registered 
description exist for at least the top-level containing object, then you
can work your way up the hierarchy until you discover something about the 
object.  

Thanks for the use cases!

cheers,
Ray


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Subject: Re: On ID "sameness"
In-Reply-To: <Pine.LNX.4.44.0302051403450.24595-100000@poplar.ncsa.uiuc.edu>
To: Ray Plante <rplante@ncsa.uiuc.edu>
Date: Wed, 5 Feb 2003 17:16:02 -0500 (EST)
CC: Arnold Rots <arots@head-cfa.cfa.harvard.edu>, metadata@us-vo.org,
   registry@ivoa.net, alberto@cfa.harvard.edu
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Ray Plante wrote:
> Hey Arnold,
> 
> ...
> > As far into those remainders as they are identical there
> > is sameness, but you would probably have to look at the metadata to
> > determine the degree of sameness.  For instance, CXO:2000 in
> > NASA:HEASARC:CXO:2000 and SAO:CDA:CXO:2000 indicate that we are
> > pointing to the same observation
> 
> I think this is a repeat of what you just said, but I would that one would 
> have to look at the metadata for NASA:HEASARC:CXO:2000 to know that it 
> refers to the same observation as SAO:CDA:CXO:2000 as there is no a priori 
> way of knowing that those common parts are intentional or accidental.  

It is a repeat, but the mission (observatory) identifier is a special
one.  The general ID is datacenterID:missionID:datasetID, where
datasetID 9or maybe all of them) may be compound.
What I was saying here is that there need to be two lists of
prescribed (and unique) IDs:
- Data center identifiers (such as NASA:HEASARC or HEASARC and SAO:CDA
  or SAO or CDA)
- Mission or telescope or observatory identifiers (such as CXO and VLA)

There are three rules:
- The registry needs to know which mission (telescope) archives are
  served by each data center.
- The original issuing data center (CDA for CXO) defines the mission
  sub-IDs (i.e., the dataset IDs).
- Other data centers that carry data from those missions (mirrored or
  otherwise) ARE REQUIRED to use the sub-ID hierarchy defined by the
  issuing data center.

The justification is two-fold:
There is a similar discussion enfolding within ADEC, related to tieing
datasets to bibcodes which involves the ADS, the data centers, and
the journals.  This seems to gravitate toward an identifier that
consists of missionID:datasetID.  Clearly, in order to provide an ID
that will work in perpetuity, the mission ID and dataset ID are
crucial, but a data center ID may do more harm than good.  In order to
turn a journal article's link into a "real" link, it would need to be
prefixed by a data center ID, which is where the registry comes in.
However, this will only work if the sub-ID space for each mission or
telescope is immutable.  [I am assuming here that we would want both
ID systems to be compatible]  If you like, you can think of
missionID:datasetID as a logical ID, and
datacenterID:missionID:datasetID as a physical ID.
Second, it may be that a secondary archive does not store a complete
mission archive.  It would be nice if it were able to detect a link to a
missing data object from the ID and then pass the whole thing on to a
primary archive that does have everything.

  - Arnold


> 
> ...
> cheers,
> Ray
> 
> 
--------------------------------------------------------------------------
Arnold H. Rots                                Chandra X-ray Science Center
Smithsonian Astrophysical Observatory                tel:  +1 617 496 7701
60 Garden Street, MS 67                              fax:  +1 617 495 7356
Cambridge, MA 02138                             arots@head-cfa.harvard.edu
USA                                     http://hea-www.harvard.edu/~arots/
--------------------------------------------------------------------------

From - Thu Feb  6 00:01:37 2003
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To: metadata@us-vo.org, registry@ivoa.net
Subject: Re: On ID "sameness"
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This is an interesting discussion to those of us in the peanut gallery.
Two comments.

First, Arnold's use case implicitly assumes a one-to-one, or at most,
a one-to-many mapping between derived data products and a raw data set.
There may be several variations of a particular observation:

Event list          SAO:CDA:CXO:2000:primary:acisf02000N001_evt.fits
FITS hi_res image   SAO:CDA:CXO:2000:primary:acisf02000N001_cntr_img2.fits
Jpeg hi_res image   SAO:CDA:CXO:2000:primary:acisf02000N001_cntr_img2.jpg

...but there may also be derived data products that result from two or
more observations.  I won't presume to tell you how to handle this - and
perhaps the answer is already evident to folks who are spending more
than a half hour a week on this discussion - but please make sure this
many-to-many case is supported.

Second, ground based archives are on a fast track, at least at NOAO.
The sociology of ground based optical/IR astronomy is such that our
archives will contain many data sets that were only loosely curated.
It may certainly be appropriate to set a level of technical buy-in to
NVO that such PI-contributed data products will not be able to meet -
at least not without significant massaging at the point of archive
ingest.  It may be appropriate, but it may not be wise to set the
level of buy-in too extremely high.  Please keep registry and
nomenclature requirements at a level that an individual researcher
and her grad student can afford the time and money to meet.

For instance:

> it does require a fully hierarchical object space.

Sounds like a great thing.  What are examples of non-hierarchical
or partially hierarchical object spaces - and how do they fall short
of the requirements being discussed?  And why should an individual
PI care to learn about such issues?

Arnold also says:

> What I was saying here is that there need to be two lists of
> prescribed (and unique) IDs:
> - Data center identifiers (such as NASA:HEASARC or HEASARC and SAO:CDA
>   or SAO or CDA)
> - Mission or telescope or observatory identifiers (such as CXO and VLA)

These are really three lists.  A mission or a telescope is a scientific
entity - a cluster of facilities and the experiments possible on those
facilities.  A data center is a library or museum or simply a bookkeeping
entity - whatever analogy floats your boat.  An observatory, however,
is a political entity.  NOAO is an observatory that manages many
telescopes and many data centers.

Note that the left hand side of the name space also suffers (or benefits)
from the many to many mapping discussed above.  The Mayall is a telescope
managed by NOAO.  The WIYN is a telescope managed by four political entities -
NOAO and three Universities.  Gemini consists of two telescopes managed by
seven observatory entities.  Some of this complexity can be smoothed out
at the data center level - but not in all cases.

Rob Seaman
NOAO Science Archive

From - Thu Feb  6 10:01:37 2003
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From: Clive Page <cgp@star.le.ac.uk>
To: Arnold Rots <arots@head-cfa.cfa.harvard.edu>
cc: Arnold Rots <arots@head-cfa.cfa.harvard.edu>, <registry@ivoa.net>,
   <metadata@us-vo.org>
Subject: Re: Scope of registry
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On Wed, 5 Feb 2003, Arnold Rots wrote:

> So, it becomes a matter of degree.

Yes.  And I think the question of the granularity of information in the
Registry is a matter of debate.  It could be that different registries
have different policies.  The AstroGrid project has decided in principle
that a fine-grained registry is something to aim for (but maybe not in
version 1.0).  Others may have different aims.

It is clear that any query can be answered more definitively by firing
actual queries to each resource around the world, but the number of such
resources is getting quite large.  And we already know what happens when
you try that even on a limited scale: just use Astrobrowse to query the
set of sites they currently have listed and you find that even after a
minute or so not all the replies have come in.   A fine-grained registry
could, in principle, reduce the number of queries you need to send out
by quite a considerable factor (few observatories have observed more than
a tiny fraction of the sky, unless they have done systematic surveys).  I
think that would be nice to have, but I fully accept that it is not easy
to provide, so must be a matter for debate.  At least the debate has now
started.


-- 
Clive Page,
Dept of Physics & Astronomy,
University of Leicester,    Tel +44 116 252 3551
Leicester, LE1 7RH,  U.K.   Fax +44 116 252 3311

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Message-ID: <009a01c2cd50$b331d360$7deca782@stsci.edu>
From: "Robert Hanisch" <hanisch@stsci.edu>
To: <registry@ivoa.net>, <metadata@us-vo.org>
References: <200302051855.h15It0Z05375@xebec.cfa.harvard.edu>
Subject: Resource & Service Metadata concepts doc
Date: Wed, 5 Feb 2003 14:56:40 -0500
Organization: Space Telescope Science Institute
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Status:   

Inspired by the recent active discussion about registries, and with
Francoise's notes about our October discussion of resource metadata, I have
finally updated the concepts document.  I added a list of revisions,
reproduced here:

Changes from V5
 ·    Added Date element, following Dublin Core and in response to October
2002 discussion.
·    Added Version element, in response to October 2002 discussion.  Not in
Dublin Core.
·    Added Creator.Logo element, in response to October 2002 discussion.
Not Dublin Core.
·    Added Subject element, to replace Coverage.Topics, as the former is
Dublin Core, the latter is not, and the intent is basically the same.
·    Added ContentLevel element, to replace Coverage.Level.  Upon reflection
I thought that ContentLevel was both a better label and was of a different
nature than the other Coverage elements.  M. Voit will provide further
inputs on appropriate element values.
·    Updated example to use new metadata elements.

The document is currently available at

    http://www.stsci.edu/~hanisch/NVO/ResourceServiceMetadataV6.doc
or
    http://www.stsci.edu/~hanisch/NVO/ResourceServiceMetadataV6.pdf

Cheers,
Bob

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Date: Thu, 06 Feb 2003 09:31:32 -0500
From: Tom McGlynn <Thomas.A.McGlynn@nasa.gov>
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To: Clive Page <cgp@star.le.ac.uk>
CC: Arnold Rots <arots@head-cfa.cfa.harvard.edu>, registry@ivoa.net,
   metadata@us-vo.org
Subject: Re: Scope of registry
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Status:   

One thing that has come to me in thinking about this
issue is that there is potentially a difference between
the granularity of a registry and that of a registry service.

Consider a registry as being
a table having only a high-level (low-granularity) information
about services.  The services themselves provide some protocol
that gives fine-grainded information.  To give a concrete
example, the registry might contain a reference to the
Chandra archive, the NTT archive, and so forth.  Part of the
information the registry has about the Chandra archive
is its coverage service, which a user can invoke to get
fine grained information about the position of Chandra observations.
In some sense we might think of this as a registry hierarchy:
an observation catalog is a 'registry' of the observations
described.

However, there is no reason why a registry service that a user
(or other software) might invoke, couldn't take advantage of
both of the registry and the coverage services.  I could see this working
something like DNS services on the Web.  When a domain name server
is queried about some name it goes and queries a chain of services
until it resolves the name.  When it's queried a second time for
the same name, it uses a local cache.  Users tend to communicate
with only a subset of internet nodes, so the relatively small local
cache gives a local user almost the same benefit as if it had the
full listing of all X billion web addresses.

Similarly when a registry service
is queried about about observations in a given region the first
time it looks at in coarse information to determine possible services
and based upon that and other user criteria is goes off
and gets fine grained information from the appropriate services.
Since this information doesn't change rapidly, and people tend
to be interested in the same regions of the sky, the registry
service caches the fine grained information for a period of
time of the order of hours or days perhaps longer for
unchanging data sets.

We don't get static coupling of the various services with
the registry, which we'd have if the registry itself contained
the fine grained information, but the user is likely to get
most of the speed advantage of having the data all in one place.
I'd envisage the particular case of registries and coverage
services as being a specialization of some more generic support
for registry hierarchies.

If we can agree upon a standard protocol by which a archive
gives the detailed information, then I think this approach
will be easier for all sides: the data providers who provide only
overview information to the registry, the registry
builders who don't need to worry about synchronization of data
and the users who get the latest information soonest.  I don't
even think it will be very hard to implement in the registry services.

	Tom McGlynn

Clive Page wrote:
> On Wed, 5 Feb 2003, Arnold Rots wrote:
> 
> 
>>So, it becomes a matter of degree.
> 
> 
> Yes.  And I think the question of the granularity of information in the
> Registry is a matter of debate.  It could be that different registries
> have different policies.  The AstroGrid project has decided in principle
> that a fine-grained registry is something to aim for (but maybe not in
> version 1.0).  Others may have different aims.
> 
> It is clear that any query can be answered more definitively by firing
> actual queries to each resource around the world, but the number of such
> resources is getting quite large.  And we already know what happens when
> you try that even on a limited scale: just use Astrobrowse to query the
> set of sites they currently have listed and you find that even after a
> minute or so not all the replies have come in.   A fine-grained registry
> could, in principle, reduce the number of queries you need to send out
> by quite a considerable factor (few observatories have observed more than
> a tiny fraction of the sky, unless they have done systematic surveys).  I
> think that would be nice to have, but I fully accept that it is not easy
> to provide, so must be a matter for debate.  At least the debate has now
> started.
> 
> 


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From: "Tony Linde" <ael@star.le.ac.uk>
To: registry@ivoa.net, metadata@us-vo.org
Date: Thu, 06 Feb 2003 14:44:38 +0000
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Subject: Re: Scope of registry
References: <Pine.GSO.4.44L0.0302060849330.22147-100000@sparky.star.le.ac.uk> <3E4271C4.1060103@nasa.gov>
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Status:   

Tom,

Well put. That is what I was getting at with my view of each project's
ability to determine its own registry structure, granularity and method
of implementation but which must respond to IVOA standard queries (which
may require a fine-grained response).

Cheers,
Tony.

On Thu, 06 Feb 2003 09:31:32 -0500, "Tom McGlynn"
<Thomas.A.McGlynn@nasa.gov> said:
> One thing that has come to me in thinking about this
> issue is that there is potentially a difference between
> the granularity of a registry and that of a registry service.
> 
> Consider a registry as being
> a table having only a high-level (low-granularity) information
> about services.  The services themselves provide some protocol
> that gives fine-grainded information.  To give a concrete
> example, the registry might contain a reference to the
> Chandra archive, the NTT archive, and so forth.  Part of the
> information the registry has about the Chandra archive
> is its coverage service, which a user can invoke to get
> fine grained information about the position of Chandra observations.
> In some sense we might think of this as a registry hierarchy:
> an observation catalog is a 'registry' of the observations
> described.
> 
> However, there is no reason why a registry service that a user
> (or other software) might invoke, couldn't take advantage of
> both of the registry and the coverage services.  I could see this working
> something like DNS services on the Web.  When a domain name server
> is queried about some name it goes and queries a chain of services
> until it resolves the name.  When it's queried a second time for
> the same name, it uses a local cache.  Users tend to communicate
> with only a subset of internet nodes, so the relatively small local
> cache gives a local user almost the same benefit as if it had the
> full listing of all X billion web addresses.
> 
> Similarly when a registry service
> is queried about about observations in a given region the first
> time it looks at in coarse information to determine possible services
> and based upon that and other user criteria is goes off
> and gets fine grained information from the appropriate services.
> Since this information doesn't change rapidly, and people tend
> to be interested in the same regions of the sky, the registry
> service caches the fine grained information for a period of
> time of the order of hours or days perhaps longer for
> unchanging data sets.
> 
> We don't get static coupling of the various services with
> the registry, which we'd have if the registry itself contained
> the fine grained information, but the user is likely to get
> most of the speed advantage of having the data all in one place.
> I'd envisage the particular case of registries and coverage
> services as being a specialization of some more generic support
> for registry hierarchies.
> 
> If we can agree upon a standard protocol by which a archive
> gives the detailed information, then I think this approach
> will be easier for all sides: the data providers who provide only
> overview information to the registry, the registry
> builders who don't need to worry about synchronization of data
> and the users who get the latest information soonest.  I don't
> even think it will be very hard to implement in the registry services.
> 
> 	Tom McGlynn
> 
> Clive Page wrote:
> > On Wed, 5 Feb 2003, Arnold Rots wrote:
> > 
> > 
> >>So, it becomes a matter of degree.
> > 
> > 
> > Yes.  And I think the question of the granularity of information in the
> > Registry is a matter of debate.  It could be that different registries
> > have different policies.  The AstroGrid project has decided in principle
> > that a fine-grained registry is something to aim for (but maybe not in
> > version 1.0).  Others may have different aims.
> > 
> > It is clear that any query can be answered more definitively by firing
> > actual queries to each resource around the world, but the number of such
> > resources is getting quite large.  And we already know what happens when
> > you try that even on a limited scale: just use Astrobrowse to query the
> > set of sites they currently have listed and you find that even after a
> > minute or so not all the replies have come in.   A fine-grained registry
> > could, in principle, reduce the number of queries you need to send out
> > by quite a considerable factor (few observatories have observed more than
> > a tiny fraction of the sky, unless they have done systematic surveys).  I
> > think that would be nice to have, but I fully accept that it is not easy
> > to provide, so must be a matter for debate.  At least the debate has now
> > started.
> > 
> > 
> 
> 
> 
__
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 - A no graphics, no pop-ups email service

From - Thu Feb  6 15:49:17 2003
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Subject: Re: Scope of registry
In-Reply-To: <3E4271C4.1060103@nasa.gov>
To: Tom McGlynn <Thomas.A.McGlynn@nasa.gov>
Date: Thu, 6 Feb 2003 09:46:38 -0500 (EST)
CC: Clive Page <cgp@star.le.ac.uk>,
   Arnold Rots <arots@head-cfa.cfa.harvard.edu>, registry@ivoa.net,
   metadata@us-vo.org
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Status:   

Yep, I'll go for that.

  - Arnold

Tom McGlynn wrote:
> One thing that has come to me in thinking about this
> issue is that there is potentially a difference between
> the granularity of a registry and that of a registry service.
> 
> Consider a registry as being
> a table having only a high-level (low-granularity) information
> about services.  The services themselves provide some protocol
> that gives fine-grainded information.  To give a concrete
> example, the registry might contain a reference to the
> Chandra archive, the NTT archive, and so forth.  Part of the
> information the registry has about the Chandra archive
> is its coverage service, which a user can invoke to get
> fine grained information about the position of Chandra observations.
> In some sense we might think of this as a registry hierarchy:
> an observation catalog is a 'registry' of the observations
> described.
> 
> However, there is no reason why a registry service that a user
> (or other software) might invoke, couldn't take advantage of
> both of the registry and the coverage services.  I could see this working
> something like DNS services on the Web.  When a domain name server
> is queried about some name it goes and queries a chain of services
> until it resolves the name.  When it's queried a second time for
> the same name, it uses a local cache.  Users tend to communicate
> with only a subset of internet nodes, so the relatively small local
> cache gives a local user almost the same benefit as if it had the
> full listing of all X billion web addresses.
> 
> Similarly when a registry service
> is queried about about observations in a given region the first
> time it looks at in coarse information to determine possible services
> and based upon that and other user criteria is goes off
> and gets fine grained information from the appropriate services.
> Since this information doesn't change rapidly, and people tend
> to be interested in the same regions of the sky, the registry
> service caches the fine grained information for a period of
> time of the order of hours or days perhaps longer for
> unchanging data sets.
> 
> We don't get static coupling of the various services with
> the registry, which we'd have if the registry itself contained
> the fine grained information, but the user is likely to get
> most of the speed advantage of having the data all in one place.
> I'd envisage the particular case of registries and coverage
> services as being a specialization of some more generic support
> for registry hierarchies.
> 
> If we can agree upon a standard protocol by which a archive
> gives the detailed information, then I think this approach
> will be easier for all sides: the data providers who provide only
> overview information to the registry, the registry
> builders who don't need to worry about synchronization of data
> and the users who get the latest information soonest.  I don't
> even think it will be very hard to implement in the registry services.
> 
> 	Tom McGlynn
> 
> Clive Page wrote:
> > On Wed, 5 Feb 2003, Arnold Rots wrote:
> > 
> > 
> >>So, it becomes a matter of degree.
> > 
> > 
> > Yes.  And I think the question of the granularity of information in the
> > Registry is a matter of debate.  It could be that different registries
> > have different policies.  The AstroGrid project has decided in principle
> > that a fine-grained registry is something to aim for (but maybe not in
> > version 1.0).  Others may have different aims.
> > 
> > It is clear that any query can be answered more definitively by firing
> > actual queries to each resource around the world, but the number of such
> > resources is getting quite large.  And we already know what happens when
> > you try that even on a limited scale: just use Astrobrowse to query the
> > set of sites they currently have listed and you find that even after a
> > minute or so not all the replies have come in.   A fine-grained registry
> > could, in principle, reduce the number of queries you need to send out
> > by quite a considerable factor (few observatories have observed more than
> > a tiny fraction of the sky, unless they have done systematic surveys).  I
> > think that would be nice to have, but I fully accept that it is not easy
> > to provide, so must be a matter for debate.  At least the debate has now
> > started.
> > 
> > 
> 
> 
--------------------------------------------------------------------------
Arnold H. Rots                                Chandra X-ray Science Center
Smithsonian Astrophysical Observatory                tel:  +1 617 496 7701
60 Garden Street, MS 67                              fax:  +1 617 495 7356
Cambridge, MA 02138                             arots@head-cfa.harvard.edu
USA                                     http://hea-www.harvard.edu/~arots/
--------------------------------------------------------------------------

From - Thu Feb  6 16:06:37 2003
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From: "Giaretta, DL (David) " <D.L.Giaretta@rl.ac.uk>
To: "'Tom McGlynn'" <Thomas.A.McGlynn@nasa.gov>,
   Clive Page
	 <cgp@star.le.ac.uk>
Cc: Arnold Rots <arots@head-cfa.cfa.harvard.edu>, registry@ivoa.net,
   metadata@us-vo.org
Subject: RE: Scope of registry
Date: Thu, 6 Feb 2003 15:05:51 -0000 
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Status:   

I agree with Tom up to a point.

We surely need to define what services the Registry should provide - 
and recognise that we don't need to make an exhaustive list now because we
should be able to extend it.

All registries need to sign up to this set of services - or at least be able
to
specify what sub-set it adheres to. If for any of its advertised services it
does not 
know the answer then it should "know an archive/registry who does", and
delegate the provision 
of the answer to it.

Any particular registry could adopt a caching policy with greater or lesser
intelligence. 
For example if it knows that a dataset is not being extended i.e. is frozen
because no new
observations are being made, then it can safely cache info about it for a
long time. We can
no doubt come up with a list of archive metadata which helps with this sort
of optimisation.
Of course some information may not be cacheable e.g. compute power or
network bandwidth available 
right now, which will vary from moment to moment - here the answer could be
delegated to an 
appropriate LDAP server. 

Where I differ from Tom is the view on the ease of implementation. He is
almost certainly right in that
an implementation _could_ be done very easily. However in order to obtain
acceptable performance
I would guess that a large number of optimisations would be utilised, and
this would bring us to Clive's
view in that any project that wants a really really popular registry would
need to work hard - and here 
an analogy with search engines and Google would be useful. Which project
will end up providing the Google
of the IVOA?

The implication from this is that we should define the initial set of
services we need and the
information (data and metadata) needed from archives, and perhaps as a
separate activity 
define archive metadata which will help in optimisations.

Cheers

...David

-----Original Message-----
From: Tom McGlynn [mailto:Thomas.A.McGlynn@nasa.gov]
Sent: 06 February 2003 14:32
To: Clive Page
Cc: Arnold Rots; registry@ivoa.net; metadata@us-vo.org
Subject: Re: Scope of registry


One thing that has come to me in thinking about this
issue is that there is potentially a difference between
the granularity of a registry and that of a registry service.

Consider a registry as being
a table having only a high-level (low-granularity) information
about services.  The services themselves provide some protocol
that gives fine-grainded information.  To give a concrete
example, the registry might contain a reference to the
Chandra archive, the NTT archive, and so forth.  Part of the
information the registry has about the Chandra archive
is its coverage service, which a user can invoke to get
fine grained information about the position of Chandra observations.
In some sense we might think of this as a registry hierarchy:
an observation catalog is a 'registry' of the observations
described.

However, there is no reason why a registry service that a user
(or other software) might invoke, couldn't take advantage of
both of the registry and the coverage services.  I could see this working
something like DNS services on the Web.  When a domain name server
is queried about some name it goes and queries a chain of services
until it resolves the name.  When it's queried a second time for
the same name, it uses a local cache.  Users tend to communicate
with only a subset of internet nodes, so the relatively small local
cache gives a local user almost the same benefit as if it had the
full listing of all X billion web addresses.

Similarly when a registry service
is queried about about observations in a given region the first
time it looks at in coarse information to determine possible services
and based upon that and other user criteria is goes off
and gets fine grained information from the appropriate services.
Since this information doesn't change rapidly, and people tend
to be interested in the same regions of the sky, the registry
service caches the fine grained information for a period of
time of the order of hours or days perhaps longer for
unchanging data sets.

We don't get static coupling of the various services with
the registry, which we'd have if the registry itself contained
the fine grained information, but the user is likely to get
most of the speed advantage of having the data all in one place.
I'd envisage the particular case of registries and coverage
services as being a specialization of some more generic support
for registry hierarchies.

If we can agree upon a standard protocol by which a archive
gives the detailed information, then I think this approach
will be easier for all sides: the data providers who provide only
overview information to the registry, the registry
builders who don't need to worry about synchronization of data
and the users who get the latest information soonest.  I don't
even think it will be very hard to implement in the registry services.

	Tom McGlynn

Clive Page wrote:
> On Wed, 5 Feb 2003, Arnold Rots wrote:
> 
> 
>>So, it becomes a matter of degree.
> 
> 
> Yes.  And I think the question of the granularity of information in the
> Registry is a matter of debate.  It could be that different registries
> have different policies.  The AstroGrid project has decided in principle
> that a fine-grained registry is something to aim for (but maybe not in
> version 1.0).  Others may have different aims.
> 
> It is clear that any query can be answered more definitively by firing
> actual queries to each resource around the world, but the number of such
> resources is getting quite large.  And we already know what happens when
> you try that even on a limited scale: just use Astrobrowse to query the
> set of sites they currently have listed and you find that even after a
> minute or so not all the replies have come in.   A fine-grained registry
> could, in principle, reduce the number of queries you need to send out
> by quite a considerable factor (few observatories have observed more than
> a tiny fraction of the sky, unless they have done systematic surveys).  I
> think that would be nice to have, but I fully accept that it is not easy
> to provide, so must be a matter for debate.  At least the debate has now
> started.
> 
> 

From - Thu Feb  6 16:46:23 2003
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From: "Roy Williams" <roy@cacr.caltech.edu>
To: "Giaretta, DL \(David\) " <D.L.Giaretta@rl.ac.uk>
Cc: <registry@ivoa.net>, <metadata@us-vo.org>
References: <49F73BEED865D3119F8700902773C9F9013FF751@exchange09.rl.ac.uk>
Subject: Re: Scope of registry
Date: Thu, 6 Feb 2003 07:44:20 -0800
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> We surely need to define what services the Registry should
> provide - and recognise that we don't need to make an
> exhaustive list now because we should be able to extend it.
> All registries need to sign up to this set of services -
> or at least be able to specify what sub-set it adheres to

In the OAI model, there are exactly six verbs that the registry understands.
The verbs are:

Identify (who are you)
List Metadata Formats (what schemas do you have for metadata)
List Sets (collections hosted by this repository)
List Identifiers (return just the identifiers and dates of most recent
change)
List Records (return full records)
Get Record (return a full record from its identifier).

This is a pretty basic set of services!

If a registry has an OAI interface, it can have others too. ArXiv and ADS
brought up OAI long after they had their native interfaces.

In addition to OAI, we would need to define and implement a query language
using additional verbs. If, for example, we define each survey by its sky
coverage, then OAI provides no way to ask for every survey that covers
Orion.

Roy

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

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From: "Tony Linde" <ael@star.le.ac.uk>
To: registry@ivoa.net, metadata@us-vo.org
Date: Thu, 06 Feb 2003 15:47:45 +0000
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Subject: RE: Scope of registry
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> We surely need to define what services the Registry should provide - 

This is key. In particular, we should define the boundary between a
registry and the archive/dataset/catalog/...  resources; between the
services that a registry provides and those of the data etc resources.

A registry should not be seen as a facade to the resources but as a way
of looking up those resources that will/may have the answer you want. You
will then invoke the appropriate resource service to perform your task
(eg querying a catalog for objects meeting some criteria). 

To do this we need to define, within IVOA, a *standard* list of resource
types and the *standard* metadata associated with each type of resource.
So, each resource of type 'catalog' which is listed will have a set of
metadata meeting some catalog-metadata schema, each resource of type
'archive' which is listed will have a set of metadata meeting some
archive-metadata schema, etc. (This may fit in with Roy's set of
different OAI formats - but I've not fully understood that).

These metadata standards will be a *minimal* set for each resource type.
A specific registry may hold more metadata on specific resource types -
thus having finer granularity than the standard. Each resource will
therefore also have to be able to answer some of the 'what type of data
do you hold', 'do you cover X patch of sky', ... to cope with the case
where it has been found by someone using a limited registry. The extended
metadata is likely to be used by service resources offered by the same
people who developed that registry but available to other service
providers.

Of course, a registry may 'pretend' to offer an extended set of metadata
on a resource type but, in implementation, will query the resource
directly when questioned about the extended metadata. This would only
work if, say, it was co-located with the resources and only listed those
resources. 

But all implementation details are up to the individual registry
developers.

Perhaps this is where some confusion comes in - some of us are talking
about the definition of IVOA standards and others about the
implementation of the US-VO specific registry.

Cheers,
Tony.

On Thu, 6 Feb 2003 15:05:51 -0000 , "Giaretta, DL (David) "
<D.L.Giaretta@rl.ac.uk> said:
> I agree with Tom up to a point.
> 
> We surely need to define what services the Registry should provide - 
> and recognise that we don't need to make an exhaustive list now because
> we
> should be able to extend it.
> 
> All registries need to sign up to this set of services - or at least be
> able
> to
> specify what sub-set it adheres to. If for any of its advertised services
> it
> does not 
> know the answer then it should "know an archive/registry who does", and
> delegate the provision 
> of the answer to it.
> 
> Any particular registry could adopt a caching policy with greater or
> lesser
> intelligence. 
> For example if it knows that a dataset is not being extended i.e. is
> frozen
> because no new
> observations are being made, then it can safely cache info about it for a
> long time. We can
> no doubt come up with a list of archive metadata which helps with this
> sort
> of optimisation.
> Of course some information may not be cacheable e.g. compute power or
> network bandwidth available 
> right now, which will vary from moment to moment - here the answer could
> be
> delegated to an 
> appropriate LDAP server. 
> 
> Where I differ from Tom is the view on the ease of implementation. He is
> almost certainly right in that
> an implementation _could_ be done very easily. However in order to obtain
> acceptable performance
> I would guess that a large number of optimisations would be utilised, and
> this would bring us to Clive's
> view in that any project that wants a really really popular registry
> would
> need to work hard - and here 
> an analogy with search engines and Google would be useful. Which project
> will end up providing the Google
> of the IVOA?
> 
> The implication from this is that we should define the initial set of
> services we need and the
> information (data and metadata) needed from archives, and perhaps as a
> separate activity 
> define archive metadata which will help in optimisations.
> 
> Cheers
> 
> ...David
> 
> -----Original Message-----
> From: Tom McGlynn [mailto:Thomas.A.McGlynn@nasa.gov]
> Sent: 06 February 2003 14:32
> To: Clive Page
> Cc: Arnold Rots; registry@ivoa.net; metadata@us-vo.org
> Subject: Re: Scope of registry
> 
> 
> One thing that has come to me in thinking about this
> issue is that there is potentially a difference between
> the granularity of a registry and that of a registry service.
> 
> Consider a registry as being
> a table having only a high-level (low-granularity) information
> about services.  The services themselves provide some protocol
> that gives fine-grainded information.  To give a concrete
> example, the registry might contain a reference to the
> Chandra archive, the NTT archive, and so forth.  Part of the
> information the registry has about the Chandra archive
> is its coverage service, which a user can invoke to get
> fine grained information about the position of Chandra observations.
> In some sense we might think of this as a registry hierarchy:
> an observation catalog is a 'registry' of the observations
> described.
> 
> However, there is no reason why a registry service that a user
> (or other software) might invoke, couldn't take advantage of
> both of the registry and the coverage services.  I could see this working
> something like DNS services on the Web.  When a domain name server
> is queried about some name it goes and queries a chain of services
> until it resolves the name.  When it's queried a second time for
> the same name, it uses a local cache.  Users tend to communicate
> with only a subset of internet nodes, so the relatively small local
> cache gives a local user almost the same benefit as if it had the
> full listing of all X billion web addresses.
> 
> Similarly when a registry service
> is queried about about observations in a given region the first
> time it looks at in coarse information to determine possible services
> and based upon that and other user criteria is goes off
> and gets fine grained information from the appropriate services.
> Since this information doesn't change rapidly, and people tend
> to be interested in the same regions of the sky, the registry
> service caches the fine grained information for a period of
> time of the order of hours or days perhaps longer for
> unchanging data sets.
> 
> We don't get static coupling of the various services with
> the registry, which we'd have if the registry itself contained
> the fine grained information, but the user is likely to get
> most of the speed advantage of having the data all in one place.
> I'd envisage the particular case of registries and coverage
> services as being a specialization of some more generic support
> for registry hierarchies.
> 
> If we can agree upon a standard protocol by which a archive
> gives the detailed information, then I think this approach
> will be easier for all sides: the data providers who provide only
> overview information to the registry, the registry
> builders who don't need to worry about synchronization of data
> and the users who get the latest information soonest.  I don't
> even think it will be very hard to implement in the registry services.
> 
> 	Tom McGlynn
> 
> Clive Page wrote:
> > On Wed, 5 Feb 2003, Arnold Rots wrote:
> > 
> > 
> >>So, it becomes a matter of degree.
> > 
> > 
> > Yes.  And I think the question of the granularity of information in the
> > Registry is a matter of debate.  It could be that different registries
> > have different policies.  The AstroGrid project has decided in principle
> > that a fine-grained registry is something to aim for (but maybe not in
> > version 1.0).  Others may have different aims.
> > 
> > It is clear that any query can be answered more definitively by firing
> > actual queries to each resource around the world, but the number of such
> > resources is getting quite large.  And we already know what happens when
> > you try that even on a limited scale: just use Astrobrowse to query the
> > set of sites they currently have listed and you find that even after a
> > minute or so not all the replies have come in.   A fine-grained registry
> > could, in principle, reduce the number of queries you need to send out
> > by quite a considerable factor (few observatories have observed more than
> > a tiny fraction of the sky, unless they have done systematic surveys).  I
> > think that would be nice to have, but I fully accept that it is not easy
> > to provide, so must be a matter for debate.  At least the debate has now
> > started.
> > 
> > 
> 
> 
__
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: "Tony Linde" <ael@star.le.ac.uk>
To: registry@ivoa.net, metadata@us-vo.org
Date: Thu, 06 Feb 2003 15:51:01 +0000
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Subject: Re: Scope of registry
References: <49F73BEED865D3119F8700902773C9F9013FF751@exchange09.rl.ac.uk> <0d5101c2cdf6$9d234b20$6b91d783@cacr.caltech.edu>
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> List Metadata Formats (what schemas do you have for metadata)
> List Sets (collections hosted by this repository)

Sounds like the stuff I was referring to. How about writing 'The VO
Builder's Simple Guide to OAI', Roy? :)

Cheers,
Tony.

On Thu, 6 Feb 2003 07:44:20 -0800, "Roy Williams" <roy@cacr.caltech.edu>
said:
> > We surely need to define what services the Registry should
> > provide - and recognise that we don't need to make an
> > exhaustive list now because we should be able to extend it.
> > All registries need to sign up to this set of services -
> > or at least be able to specify what sub-set it adheres to
> 
> In the OAI model, there are exactly six verbs that the registry
> understands.
> The verbs are:
> 
> Identify (who are you)
> List Metadata Formats (what schemas do you have for metadata)
> List Sets (collections hosted by this repository)
> List Identifiers (return just the identifiers and dates of most recent
> change)
> List Records (return full records)
> Get Record (return a full record from its identifier).
> 
> This is a pretty basic set of services!
> 
> If a registry has an OAI interface, it can have others too. ArXiv and ADS
> brought up OAI long after they had their native interfaces.
> 
> In addition to OAI, we would need to define and implement a query
> language
> using additional verbs. If, for example, we define each survey by its sky
> coverage, then OAI provides no way to ask for every survey that covers
> Orion.
> 
> Roy
> 
> --------
> Caltech Center for Advanced Computing Research
> roy@cacr.caltech.edu
> 626 395 3670
> 
> 
__
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: "Tony Linde" <ael@star.le.ac.uk>
To: registry@ivoa.net, metadata@us-vo.org
Date: Thu, 06 Feb 2003 16:20:25 +0000
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Subject: OAI Identifiers
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> List Identifiers (return just the identifiers and dates of most recent
> change)
> List Records (return full records)
> Get Record (return a full record from its identifier).

How do the OAI identifiers relate to the ID discussion?

I guess if the identifier is like an ISBN, it can be used to refer to
multiple copies of the same entity, regardless of location. Does anyone
use OAI for resources similar to archives etc? Ie, *digital* resources
which might be copied and then changed. How do they cope with this?

Cheers,
Tony.

On Thu, 6 Feb 2003 07:44:20 -0800, "Roy Williams" <roy@cacr.caltech.edu>
said:
> > We surely need to define what services the Registry should
> > provide - and recognise that we don't need to make an
> > exhaustive list now because we should be able to extend it.
> > All registries need to sign up to this set of services -
> > or at least be able to specify what sub-set it adheres to
> 
> In the OAI model, there are exactly six verbs that the registry
> understands.
> The verbs are:
> 
> Identify (who are you)
> List Metadata Formats (what schemas do you have for metadata)
> List Sets (collections hosted by this repository)
> List Identifiers (return just the identifiers and dates of most recent
> change)
> List Records (return full records)
> Get Record (return a full record from its identifier).
> 
> This is a pretty basic set of services!
> 
> If a registry has an OAI interface, it can have others too. ArXiv and ADS
> brought up OAI long after they had their native interfaces.
> 
> In addition to OAI, we would need to define and implement a query
> language
> using additional verbs. If, for example, we define each survey by its sky
> coverage, then OAI provides no way to ask for every survey that covers
> Orion.
> 
> Roy
> 
> --------
> Caltech Center for Advanced Computing Research
> roy@cacr.caltech.edu
> 626 395 3670
> 
> 
__
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: "Giaretta, DL (David) " <D.L.Giaretta@rl.ac.uk>
To: registry@ivoa.net
Cc: metadata@us-vo.org
Subject: RE: Scope of registry
Date: Thu, 6 Feb 2003 17:05:36 -0000 
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Status:   

The simplest service in this that context is probably
   CanYouAnswerThis( some text )
which a Registry would send to every resource on its list - delegating the
question it received.

A Registry itself could have a service "PleaseAddMeToYourList" which an
external resource could use to get itself added to a Registry's list of
things to send message to.

The OAI verbs provide a high level "back-end" protocol, which optimises how
a registry would work and gather information.

However in my previous email I was refering to the "front-end" of the
Registry service(s) i.e. what can clients get from a  Registry e.g. "tell me
everything you know about area of sky X?" or "where is the best place to
join catalaog Y to catalog Z?" or "who do I ask to get access to resource
B?" or "how do I convert magnitude-A to magnitude-b?"

Once we get those front-end questions sorted out then some of the
optimisation-type (back-end) questions should become clearer.

..David


-----Original Message-----
From: Roy Williams [mailto:roy@cacr.caltech.edu]
Sent: 06 February 2003 15:44
To: Giaretta, DL (David) 
Cc: registry@ivoa.net; metadata@us-vo.org
Subject: Re: Scope of registry


> We surely need to define what services the Registry should
> provide - and recognise that we don't need to make an
> exhaustive list now because we should be able to extend it.
> All registries need to sign up to this set of services -
> or at least be able to specify what sub-set it adheres to

In the OAI model, there are exactly six verbs that the registry understands.
The verbs are:

Identify (who are you)
List Metadata Formats (what schemas do you have for metadata)
List Sets (collections hosted by this repository)
List Identifiers (return just the identifiers and dates of most recent
change)
List Records (return full records)
Get Record (return a full record from its identifier).

This is a pretty basic set of services!

If a registry has an OAI interface, it can have others too. ArXiv and ADS
brought up OAI long after they had their native interfaces.

In addition to OAI, we would need to define and implement a query language
using additional verbs. If, for example, we define each survey by its sky
coverage, then OAI provides no way to ask for every survey that covers
Orion.

Roy

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

From - Fri Feb  7 13:41:39 2003
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I would add two ideas at the ongoing discussion.

- First is about the implementation of the registry: what about to use 
Jini architecture in order to create a distributed environment where 
each entity can plug-in itself?
Jini architecture will provide a network of services with a look-up 
facility, exactly what we need for the registry (more info at 
http://www.jini.org).

- Second thing is about ID.
As suggested each entity of the registry will probably have a different 
way-of-sameness, so we can think of  ID as the super class with several 
children, one for each type of sameness:

              |-----------------|
              |           ID           |
              |-----------------|
                          |
                          |
                         /\
                          |
          
 -------------------------------------------------------------------------------------...
           |                                                   |         
                                          |
|-----------------|                      |-----------------|             
         |-----------------|
| ObservationID  | --------------|       FileID         
|---------------|    ServiceID      |-------...
|-----------------|                      |-----------------|             
         |-----------------|

In this way it could be possible to build something that implements 
different types of sameness-checking related to the entity type.




Cheers,
    Marco


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Clive Page wrote:

>On Thu, 6 Feb 2003, Roy Williams wrote:
>
>>In the OAI model, there are exactly six verbs that the registry understands.
>>The verbs are:
>>
>>Identify (who are you)
>>List Metadata Formats (what schemas do you have for metadata)
>>List Sets (collections hosted by this repository)
>>List Identifiers (return just the identifiers and dates of most recent
>>change)
>>List Records (return full records)
>>Get Record (return a full record from its identifier).
>>
>>This is a pretty basic set of services!
>>
>
>That seems to me rather more basic than will be suitable for what we want.
>I confess to thinking of the registry in database terms.  Users might want
>to send queries to the registry equivalent to this sort of thing
>(expressed for convenience in pseudo-SQL):
>
>SELECT * FROM registry WHERE WAVELENGTH BETWEEN "400 nm" AND "800 nm" AND
>  POSITION("12:34:56,-01:23,10") AND TYPE = "photometry"
>
>If we don't allow such selectivity in registry queries, won't all queries
>just return all records?  I thought the idea of the registry was not just
>to have a definitive list of resources, but also avoid the necessity for
>users to send their queries to _all_ registered resources, just on the
>off-chance that each of them might have some information of relevance.
>
In fact the registry should do most of the work for you, if we think of 
it as Tom suggested.
The registry should use the cached information to find out which service 
may have the answer then it will send the detailed query to that/those 
service/s.

>
>
>Querying all resources will be very time-consuming, and will also have to
>be repeated, because not all resources will be on-line at all times.
>Users who suspect that the archives of the University of Erewhon
>Observatory has something relevant, but find that it is frequently
>off-line will have to try it many times.  If, on the other hand, their
>initial query to the Registry shows that the answer concerning the Erewhon
>site is "no" rather than "maybe", they can avoid such time-wasting
>activities.
>
Perhaps asynchronous calls will help to reduce disocomfort due to 
unavailables services.
But this is related only to the second step: if the registry knows from 
the cached data that service doesn't help then the answer is immediately 
"no", otherwise you have to wait till the service will be online again.

>
>
>To those who doubt that this is an important factor I would suggest: go to
>the Astrobrowse site, http://heasarc.gsfc.nasa.gov/ab/, and select a full
>search, and see how long it takes to get an answer from all the linked
>resources.  I find it takes typically 40 to 60 seconds, but that sometimes
>one or two sites never respond (we all have occasional outages, after
>all).  Astrobrowse currently only queries the principal sites, all
>well-networked and well-managed.  When our Registry includes sites less
>well endowed, things may not be as good.
>


Cheers,
    Marco

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<head>
  <meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1">
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<body>
<font color="#999999">Clive Page wrote:<br>
</font>
<blockquote type="cite"
 cite="midPine.LNX.4.44L0.0302070917420.14147-100000@peneca.star.le.ac.uk">
  <pre wrap=""><font color="#999999">On Thu, 6 Feb 2003, Roy Williams wrote:</font></pre>
  <blockquote type="cite">
    <pre wrap=""><font color="#999999">In the OAI model, there are exactly six verbs that the registry understands.
The verbs are:

Identify (who are you)
List Metadata Formats (what schemas do you have for metadata)
List Sets (collections hosted by this repository)
List Identifiers (return just the identifiers and dates of most recent
change)
List Records (return full records)
Get Record (return a full record from its identifier).

This is a pretty basic set of services!
</font></pre>
  </blockquote>
  <pre wrap=""><!----><font color="#999999">
That seems to me rather more basic than will be suitable for what we want.
I confess to thinking of the registry in database terms.  Users might want
to send queries to the registry equivalent to this sort of thing
(expressed for convenience in pseudo-SQL):

SELECT * FROM registry WHERE WAVELENGTH BETWEEN "400 nm" AND "800 nm" AND
  POSITION("12:34:56,-01:23,10") AND TYPE = "photometry"

If we don't allow such selectivity in registry queries, won't all queries
just return all records?  I thought the idea of the registry was not just
to have a definitive list of resources, but also avoid the necessity for
users to send their queries to _all_ registered resources, just on the
off-chance that each of them might have some information of relevance.</font></pre>
</blockquote>
In fact the registry should do most of the work for you, if we think of it
as Tom suggested.<br>
The registry should use the cached information to find out which service
may have the answer then it will send the detailed query to that/those service/s.<br>
<blockquote type="cite"
 cite="midPine.LNX.4.44L0.0302070917420.14147-100000@peneca.star.le.ac.uk">
  <pre wrap=""><font color="#999999">

Querying all resources will be very time-consuming, and will also have to
be repeated, because not all resources will be on-line at all times.
Users who suspect that the archives of the University of Erewhon
Observatory has something relevant, but find that it is frequently
off-line will have to try it many times.  If, on the other hand, their
initial query to the Registry shows that the answer concerning the Erewhon
site is "no" rather than "maybe", they can avoid such time-wasting
activities.</font></pre>
</blockquote>
Perhaps asynchronous calls will help to reduce disocomfort due to unavailables
services.<br>
But this is related only to the second step: if the registry knows from the
cached data that service doesn't help then the answer is immediately "no",
otherwise you have to wait till the service will be online again.<br>
<blockquote type="cite"
 cite="midPine.LNX.4.44L0.0302070917420.14147-100000@peneca.star.le.ac.uk">
  <pre wrap=""><font color="#999999">

To those who doubt that this is an important factor I would suggest: go to
the Astrobrowse site, <a class="moz-txt-link-freetext" href="http://heasarc.gsfc.nasa.gov/ab/">http://heasarc.gsfc.nasa.gov/ab/</a>, and select a full
search, and see how long it takes to get an answer from all the linked
resources.  I find it takes typically 40 to 60 seconds, but that sometimes
one or two sites never respond (we all have occasional outages, after
all).  Astrobrowse currently only queries the principal sites, all
well-networked and well-managed.  When our Registry includes sites less
well endowed, things may not be as good.</font></pre>
</blockquote>
<br>
<br>
Cheers,<br>
&nbsp;&nbsp;&nbsp; Marco<br>
</body>
</html>

--------------010809050104000708070409--

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Status:   

Juggling names around is sometimes helpful.
Here is what I was suggesting in slightly different words.

A complete identifier consists of three sub-identifiers:

L:P:D

L a service resource or location
  Has validity in the service resource namespace
  It defines a location namespace - a data repository or a URL domain,
  if you like: MAST, IRSA, HEASARC, CDA, ADS, etc.

P a project or service
  Has validity in the namespace that contains all projects: missions,
  observatories, telescopes, services such as exposure time calculators
  It defines a project namespace such as CXO, HST, RXTE, VLA, etc.

D a dataset or object
  Has validity within a particular project namespace and points to a
  dataset, observation, file, piece of information, concept, etc.


Each project needs to register its project namespace identifier.
It also means that each service resource location has to register its
identifier, as well as the list of project identifiers that it serves.
Within a project, the originator is free to design and specify its own
dataset identifiers.  It may be useful to disallow certain symbols
such as :;%&? and suggest that / be used as separator.

One should be able to refer to objects by specifying a "physical" identifier:

L:P:D

or by just a "logical" identifier:

P:D

In the latter case the registry needs to be consulted to find out
where the object may be found (i.e., which service resource carries
the service).

It is important that copies of any project at different locations
honor the dataset identifiers issued by the original project, though
it should be allowed to develop extensions.

"Not available" will be a valid response and it should be possible for
the client to indicate that the request be forwarded to a more
complete copy of the service if not available at this location.


Note that it is the existence of mirror services and the ability to
move services from one resource to another that leads to having to
define three, rather than two sub-identifiers.

Note also that the identifier does not replace a URL.  However, it
allows querying the service (resource) for the URL that would give
access to the object identified by the identifier.
That may make it easier to handle obsolete identifiers.

Hope this makes things clearer,

  - Arnold


--------------------------------------------------------------------------
Arnold H. Rots                                Chandra X-ray Science Center
Smithsonian Astrophysical Observatory                tel:  +1 617 496 7701
60 Garden Street, MS 67                              fax:  +1 617 495 7356
Cambridge, MA 02138                             arots@head-cfa.harvard.edu
USA                                     http://hea-www.harvard.edu/~arots/
--------------------------------------------------------------------------

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From: "Tony Linde" <ael@star.le.ac.uk>
To: "David Giaretta" <D.L.Giaretta@rl.ac.uk>, registry@ivoa.net
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> However in my previous email I was refering to the "front-end" of the
> Registry service(s) i.e. what can clients get from a  Registry e.g. "tell
> me
> everything you know about area of sky X?" or "where is the best place to
> join catalaog Y to catalog Z?" or "who do I ask to get access to resource
> B?" or "how do I convert magnitude-A to magnitude-b?"

I would assume that all these are answered by:

> List Metadata Formats (what schemas do you have for metadata)

This describes the types of information held in the registry. The
'client' (portal or client) would need to 'understand' this metadata and
how to use it. So if there is a resource which *can* provide the answer
to "where is the best place to join catalaog Y to catalog Z?", the client
would need to know what *type* of resource will provide such an answer
(eg TableJoinService type) and will need to query the registry asking
which resources of type 'TableJoinService' can cope with a catalog of
type Y and a catalog of type Z. 

This is probably astro-drivel but I hope you can see what I'm getting at.
I suppose Roy will come along and say that I'm talking complete-drivel!

The idea that we can send a generalised query like "where is the best
place to join catalaog Y to catalog Z?" and the registry will be able to
interpret this and work out what the client really wants will have to
wait for the AstroOntology-based registry (cue Elizabeth :).

Cheers,
Tony.

On Thu, 6 Feb 2003 17:05:36 -0000 , "Giaretta, DL (David) "
<D.L.Giaretta@rl.ac.uk> said:
> The simplest service in this that context is probably
>    CanYouAnswerThis( some text )
> which a Registry would send to every resource on its list - delegating
> the
> question it received.
> 
> A Registry itself could have a service "PleaseAddMeToYourList" which an
> external resource could use to get itself added to a Registry's list of
> things to send message to.
> 
> The OAI verbs provide a high level "back-end" protocol, which optimises
> how
> a registry would work and gather information.
> 
> However in my previous email I was refering to the "front-end" of the
> Registry service(s) i.e. what can clients get from a  Registry e.g. "tell
> me
> everything you know about area of sky X?" or "where is the best place to
> join catalaog Y to catalog Z?" or "who do I ask to get access to resource
> B?" or "how do I convert magnitude-A to magnitude-b?"
> 
> Once we get those front-end questions sorted out then some of the
> optimisation-type (back-end) questions should become clearer.
> 
> ..David
> 
> 
> -----Original Message-----
> From: Roy Williams [mailto:roy@cacr.caltech.edu]
> Sent: 06 February 2003 15:44
> To: Giaretta, DL (David) 
> Cc: registry@ivoa.net; metadata@us-vo.org
> Subject: Re: Scope of registry
> 
> 
> > We surely need to define what services the Registry should
> > provide - and recognise that we don't need to make an
> > exhaustive list now because we should be able to extend it.
> > All registries need to sign up to this set of services -
> > or at least be able to specify what sub-set it adheres to
> 
> In the OAI model, there are exactly six verbs that the registry
> understands.
> The verbs are:
> 
> Identify (who are you)
> List Metadata Formats (what schemas do you have for metadata)
> List Sets (collections hosted by this repository)
> List Identifiers (return just the identifiers and dates of most recent
> change)
> List Records (return full records)
> Get Record (return a full record from its identifier).
> 
> This is a pretty basic set of services!
> 
> If a registry has an OAI interface, it can have others too. ArXiv and ADS
> brought up OAI long after they had their native interfaces.
> 
> In addition to OAI, we would need to define and implement a query
> language
> using additional verbs. If, for example, we define each survey by its sky
> coverage, then OAI provides no way to ask for every survey that covers
> Orion.
> 
> Roy
> 
> --------
> Caltech Center for Advanced Computing Research
> roy@cacr.caltech.edu
> 626 395 3670
> 
__
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: "Giaretta, DL (David) " <D.L.Giaretta@rl.ac.uk>
To: registry@ivoa.net
Cc: metadata@us-vo.org
Subject: RE: Scope of registry
Date: Thu, 6 Feb 2003 18:01:50 -0000 
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Yes, my example questions were deliberately conversational. 

However from the Use Cases and other sources of inspiration I assume that we
will extract such questions and then break these down into simpler questions
that we might reasonably expect a Registry to answer - which of course are
likely to be rather simple. Answering the more conversational type queries
will require some smartness.

In a step by step approach one might imagine that the initial step will be
to have some special applications which have some limited smartness
built-in; for the general case one would rely upon the user's own smartness.


As Tony indicated, general Registry based smartness will have to wait a
while!

...David

-----Original Message-----
From: Tony Linde [mailto:ael@star.le.ac.uk]
Sent: 06 February 2003 17:53
To: David Giaretta; registry@ivoa.net
Cc: metadata@us-vo.org
Subject: RE: Scope of registry


> However in my previous email I was refering to the "front-end" of the
> Registry service(s) i.e. what can clients get from a  Registry e.g. "tell
> me
> everything you know about area of sky X?" or "where is the best place to
> join catalaog Y to catalog Z?" or "who do I ask to get access to resource
> B?" or "how do I convert magnitude-A to magnitude-b?"

I would assume that all these are answered by:

> List Metadata Formats (what schemas do you have for metadata)

This describes the types of information held in the registry. The
'client' (portal or client) would need to 'understand' this metadata and
how to use it. So if there is a resource which *can* provide the answer
to "where is the best place to join catalaog Y to catalog Z?", the client
would need to know what *type* of resource will provide such an answer
(eg TableJoinService type) and will need to query the registry asking
which resources of type 'TableJoinService' can cope with a catalog of
type Y and a catalog of type Z. 

This is probably astro-drivel but I hope you can see what I'm getting at.
I suppose Roy will come along and say that I'm talking complete-drivel!

The idea that we can send a generalised query like "where is the best
place to join catalaog Y to catalog Z?" and the registry will be able to
interpret this and work out what the client really wants will have to
wait for the AstroOntology-based registry (cue Elizabeth :).

Cheers,
Tony.

On Thu, 6 Feb 2003 17:05:36 -0000 , "Giaretta, DL (David) "
<D.L.Giaretta@rl.ac.uk> said:
> The simplest service in this that context is probably
>    CanYouAnswerThis( some text )
> which a Registry would send to every resource on its list - delegating
> the
> question it received.
> 
> A Registry itself could have a service "PleaseAddMeToYourList" which an
> external resource could use to get itself added to a Registry's list of
> things to send message to.
> 
> The OAI verbs provide a high level "back-end" protocol, which optimises
> how
> a registry would work and gather information.
> 
> However in my previous email I was refering to the "front-end" of the
> Registry service(s) i.e. what can clients get from a  Registry e.g. "tell
> me
> everything you know about area of sky X?" or "where is the best place to
> join catalaog Y to catalog Z?" or "who do I ask to get access to resource
> B?" or "how do I convert magnitude-A to magnitude-b?"
> 
> Once we get those front-end questions sorted out then some of the
> optimisation-type (back-end) questions should become clearer.
> 
> ..David
> 
> 
> -----Original Message-----
> From: Roy Williams [mailto:roy@cacr.caltech.edu]
> Sent: 06 February 2003 15:44
> To: Giaretta, DL (David) 
> Cc: registry@ivoa.net; metadata@us-vo.org
> Subject: Re: Scope of registry
> 
> 
> > We surely need to define what services the Registry should
> > provide - and recognise that we don't need to make an
> > exhaustive list now because we should be able to extend it.
> > All registries need to sign up to this set of services -
> > or at least be able to specify what sub-set it adheres to
> 
> In the OAI model, there are exactly six verbs that the registry
> understands.
> The verbs are:
> 
> Identify (who are you)
> List Metadata Formats (what schemas do you have for metadata)
> List Sets (collections hosted by this repository)
> List Identifiers (return just the identifiers and dates of most recent
> change)
> List Records (return full records)
> Get Record (return a full record from its identifier).
> 
> This is a pretty basic set of services!
> 
> If a registry has an OAI interface, it can have others too. ArXiv and ADS
> brought up OAI long after they had their native interfaces.
> 
> In addition to OAI, we would need to define and implement a query
> language
> using additional verbs. If, for example, we define each survey by its sky
> coverage, then OAI provides no way to ask for every survey that covers
> Orion.
> 
> Roy
> 
> --------
> Caltech Center for Advanced Computing Research
> roy@cacr.caltech.edu
> 626 395 3670
> 
__
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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Subject: continuing registry discussions...
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Status:   

We agreed in our NVO Metadata Working Group telecon this morning that those
of us on the NVO side interested in the registry issues specifically will
all subscribe to registry@ivoa.net.  Thus, henceforth there is no need to
send messages to both distribution lists.

Cheers,
Bob

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From: Andrew Lawrence <al@roe.ac.uk>
To: "'Robert Hanisch'" <hanisch@stsci.edu>, registry@ivoa.net
Cc: metadata@us-vo.org
Subject: RE: continuing registry discussions...
Date: Thu, 6 Feb 2003 18:13:49 -0000 
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Status:   

Bob

this is good - but can I suggest that people try to distinguish between
US-VO specific discussions and generic IVOA registry issues ? I have
found some of the last few days discussion even more confusing than I
usually do .... then when I noticed that messages said things like
"further to my point in the telecon ..."  or "thanks for the use-cases
Fred" etc, I began to understand why it was so hard to follow ...

          andy lawrence



>-----Original Message-----
>From: Robert Hanisch [mailto:hanisch@stsci.edu] 
>Sent: Thursday, February 06, 2003 18:06
>To: registry@ivoa.net
>Cc: metadata@us-vo.org
>Subject: continuing registry discussions...
>
>
>We agreed in our NVO Metadata Working Group telecon this 
>morning that those
>of us on the NVO side interested in the registry issues 
>specifically will
>all subscribe to registry@ivoa.net.  Thus, henceforth there is 
>no need to
>send messages to both distribution lists.
>
>Cheers,
>Bob
>
>

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From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: registry@ivoa.net
Subject: RE: continuing registry discussions...
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> this is good - but can I suggest that people try to distinguish between
> US-VO specific discussions and generic IVOA registry issues ? I have
> found some of the last few days discussion even more confusing than I
> usually do .... then when I noticed that messages said things like
> "further to my point in the telecon ..."  or "thanks for the use-cases
> Fred" etc, I began to understand why it was so hard to follow ...

Good idea, Andy.  I thought I should clarify a bit...the current stage of 
our discussion has been at the level of requirements and specifications, 
and I think it's fair to say that every idea floated at this point is a 
potential IVOA issue.  We may get to a point where details are more 
specific to particular projects--perhaps when we start to prototype 
things--and it might be helpful to split things off.  When you think 
we're getting to that point, do let us know.  For now, we've been finding 
the cross-project discussion useful.  

So NVO/US-VO-ers: Don't be afraid to use a salutation like the one I just
used to temporarily narrow the discussion.  Stuff specific to our
telecons, we'll keep on the us-vo metadata list.

Besides the ongoing discussion of registry requirements and use cases, we 
plan to discuss more possible specifications for identifiers, that I think 
would benefit from international scrutiny.  (I can summarize to this list 
the discussion we had on this topic at this week's telecon.)  Do you think 
it would be appropriate to have that discussion on this list, or should we 
solidify our ideas internally a bit before presenting it to this forum?  I 
would prefer the former, but I don't want to be a litter bug.  

cheers,
Ray


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From: "Tony Linde" <ael@star.le.ac.uk>
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> Besides the ongoing discussion of registry requirements and use cases, we 
> plan to discuss more possible specifications for identifiers, that I think 
> would benefit from international scrutiny.  (I can summarize to this list 
> the discussion we had on this topic at this week's telecon.)  Do you think 
> it would be appropriate to have that discussion on this list, or should we 
> solidify our ideas internally a bit before presenting it to this forum? I 
> would prefer the former, but I don't want to be a litter bug.  

I also prefer the former. IDs are pertinent to the registry. Perhaps
those interested in the ID issue should also join this list. We could
keep the discussions going here and US-VO people could break out to their
own list(s) to discuss specifics of the US-VO implementation.

Cheers,
Tony.

On Thu, 6 Feb 2003 12:39:37 -0600 (CST), "Ray Plante"
<rplante@poplar.ncsa.uiuc.edu> said:
> > this is good - but can I suggest that people try to distinguish between
> > US-VO specific discussions and generic IVOA registry issues ? I have
> > found some of the last few days discussion even more confusing than I
> > usually do .... then when I noticed that messages said things like
> > "further to my point in the telecon ..."  or "thanks for the use-cases
> > Fred" etc, I began to understand why it was so hard to follow ...
> 
> Good idea, Andy.  I thought I should clarify a bit...the current stage of 
> our discussion has been at the level of requirements and specifications, 
> and I think it's fair to say that every idea floated at this point is a 
> potential IVOA issue.  We may get to a point where details are more 
> specific to particular projects--perhaps when we start to prototype 
> things--and it might be helpful to split things off.  When you think 
> we're getting to that point, do let us know.  For now, we've been finding 
> the cross-project discussion useful.  
> 
> So NVO/US-VO-ers: Don't be afraid to use a salutation like the one I just
> used to temporarily narrow the discussion.  Stuff specific to our
> telecons, we'll keep on the us-vo metadata list.
> 
> Besides the ongoing discussion of registry requirements and use cases, we 
> plan to discuss more possible specifications for identifiers, that I
> think 
> would benefit from international scrutiny.  (I can summarize to this list 
> the discussion we had on this topic at this week's telecon.)  Do you
> think 
> it would be appropriate to have that discussion on this list, or should
> we 
> solidify our ideas internally a bit before presenting it to this forum? 
> I 
> would prefer the former, but I don't want to be a litter bug.  
> 
> cheers,
> Ray
> 
> 
> 
__
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 - Fri Feb  7 10:41:38 2003
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From: Clive Page <cgp@star.le.ac.uk>
To: registry@ivoa.net
Subject: Re: Scope of registry
In-Reply-To: <0d5101c2cdf6$9d234b20$6b91d783@cacr.caltech.edu>
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Status:   

On Thu, 6 Feb 2003, Roy Williams wrote:

> In the OAI model, there are exactly six verbs that the registry understands.
> The verbs are:
>
> Identify (who are you)
> List Metadata Formats (what schemas do you have for metadata)
> List Sets (collections hosted by this repository)
> List Identifiers (return just the identifiers and dates of most recent
> change)
> List Records (return full records)
> Get Record (return a full record from its identifier).
>
> This is a pretty basic set of services!

That seems to me rather more basic than will be suitable for what we want.
I confess to thinking of the registry in database terms.  Users might want
to send queries to the registry equivalent to this sort of thing
(expressed for convenience in pseudo-SQL):

SELECT * FROM registry WHERE WAVELENGTH BETWEEN "400 nm" AND "800 nm" AND
  POSITION("12:34:56,-01:23,10") AND TYPE = "photometry"

If we don't allow such selectivity in registry queries, won't all queries
just return all records?  I thought the idea of the registry was not just
to have a definitive list of resources, but also avoid the necessity for
users to send their queries to _all_ registered resources, just on the
off-chance that each of them might have some information of relevance.

Querying all resources will be very time-consuming, and will also have to
be repeated, because not all resources will be on-line at all times.
Users who suspect that the archives of the University of Erewhon
Observatory has something relevant, but find that it is frequently
off-line will have to try it many times.  If, on the other hand, their
initial query to the Registry shows that the answer concerning the Erewhon
site is "no" rather than "maybe", they can avoid such time-wasting
activities.

To those who doubt that this is an important factor I would suggest: go to
the Astrobrowse site, http://heasarc.gsfc.nasa.gov/ab/, and select a full
search, and see how long it takes to get an answer from all the linked
resources.  I find it takes typically 40 to 60 seconds, but that sometimes
one or two sites never respond (we all have occasional outages, after
all).  Astrobrowse currently only queries the principal sites, all
well-networked and well-managed.  When our Registry includes sites less
well endowed, things may not be as good.


-- 
Clive Page,
Dept of Physics & Astronomy,
University of Leicester,    Tel +44 116 252 3551
Leicester, LE1 7RH,  U.K.   Fax +44 116 252 3311

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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: <registry@ivoa.net>
Subject: RE: Scope of registry
Date: Fri, 7 Feb 2003 10:17:46 -0000
Organization: University of Leicester
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Status:   

Continuing the OAI theme: this should be achievable. If, as I suggested
in a previous message, we have a Metadata Format for each resource type
(catalog, archive, dataset, table merge service etc.), then the format
schema for each type will list the fields (with content constraints)
that will be used to describe that resource type.

Many of the resource types will have common fields, eg wavelength,
position, observationType, etc. It will then be possible to submit a
registry query which looks at *all* resource types whose schemas contain
the fields (wavelength, position, observationType). You could also
restrict the query to, say, only return resources of type 'catalog'. You
might also make some of the criteria, eg observationType optional, so
any resource type whose schema does not include observationType (or
where the observationType was included but missing on some records)
would also be included in the search, but only using the first two
criteria.

Once we've got this working, some projects may want to look at ways of
building some intelligence into the interpretation of the schema fields.
Eg, it may be possible to deduce (with a calculable probability factor -
which might be included in the query) one field from combinations of
other fields. The next step will be to bring ontological inference into
the deduction process.

Cheers,
Tony.

> -----Original Message-----
> From: Clive Page [mailto:cgp@star.le.ac.uk] 
> Sent: 07 February 2003 09:38
> To: registry@ivoa.net
> Subject: Re: Scope of registry
> 
> 
> On Thu, 6 Feb 2003, Roy Williams wrote:
> 
> > In the OAI model, there are exactly six verbs that the registry 
> > understands. The verbs are:
> >
> > Identify (who are you)
> > List Metadata Formats (what schemas do you have for metadata) List 
> > Sets (collections hosted by this repository) List 
> Identifiers (return 
> > just the identifiers and dates of most recent
> > change)
> > List Records (return full records)
> > Get Record (return a full record from its identifier).
> >
> > This is a pretty basic set of services!
> 
> That seems to me rather more basic than will be suitable for 
> what we want. I confess to thinking of the registry in 
> database terms.  Users might want to send queries to the 
> registry equivalent to this sort of thing (expressed for 
> convenience in pseudo-SQL):
> 
> SELECT * FROM registry WHERE WAVELENGTH BETWEEN "400 nm" AND 
> "800 nm" AND
>   POSITION("12:34:56,-01:23,10") AND TYPE = "photometry"
> 
> If we don't allow such selectivity in registry queries, won't 
> all queries just return all records?  I thought the idea of 
> the registry was not just to have a definitive list of 
> resources, but also avoid the necessity for users to send 
> their queries to _all_ registered resources, just on the 
> off-chance that each of them might have some information of relevance.
> 
> Querying all resources will be very time-consuming, and will 
> also have to be repeated, because not all resources will be 
> on-line at all times. Users who suspect that the archives of 
> the University of Erewhon Observatory has something relevant, 
> but find that it is frequently off-line will have to try it 
> many times.  If, on the other hand, their initial query to 
> the Registry shows that the answer concerning the Erewhon 
> site is "no" rather than "maybe", they can avoid such 
> time-wasting activities.
> 
> To those who doubt that this is an important factor I would 
> suggest: go to the Astrobrowse site, 
> http://heasarc.gsfc.nasa.gov/ab/, and select a > full search, 
> and see how long it takes to get an answer from all the 
> linked resources.  I find it takes typically 40 to 60 
> seconds, but that sometimes one or two sites never respond 
> (we all have occasional outages, after all).  Astrobrowse 
> currently only queries the principal sites, all 
> well-networked and well-managed.  When our Registry includes 
> sites less well endowed, things may not be as good.
> 
> 
> -- 
> Clive Page,
> Dept of Physics & Astronomy,
> University of Leicester,    Tel +44 116 252 3551
> Leicester, LE1 7RH,  U.K.   Fax +44 116 252 3311
> 

From - Fri Feb  7 19:41:39 2003
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Date: Fri, 7 Feb 2003 12:37:30 -0600 (CST)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: Clive Page <cgp@star.le.ac.uk>
cc: registry@ivoa.net
Subject: Re: Scope of registry
In-Reply-To: <Pine.LNX.4.44L0.0302070917420.14147-100000@peneca.star.le.ac.uk>
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Status:   

On Fri, 7 Feb 2003, Clive Page wrote:
> On Thu, 6 Feb 2003, Roy Williams wrote:
> > In the OAI model...
> >
> > This is a pretty basic set of services!
> 
> That seems to me rather more basic than will be suitable for what we want.

There are a few things to keep in mind when thinking about how we might 
use OAI's harvesting interface.

1.  The harvesting interface, with its 6 basic services, is meant to be 
    used by a registry to get information from data providers.  The 
    example query you cited is typical of one a user will as of a 
    registry.  Yes, for this, a different interface is needed.

2.  I would expect that the "records" harvested from a data site will 
    typically be of a high level:  they will describe data collections and 
    services.  Typically, to get detailed information about individual 
    images, catalogs, records from catalogs, etc., a query would be sent 
    directly to the data provider.  Obviously, a different interface (a la 
    cone search, SIA, etc.) is needed.

3.  We may discover that an additional harvesting service might be needed, 
    and we could extend it as necessary.  However, of course, we should 
    see if we can get away without doing that, if possible.  

cheers,
Ray





From - Sun Feb  9 17:16:40 2003
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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: Meeting
Date: Sun, 9 Feb 2003 16:11:18 -0000
Organization: University of Leicester
Message-ID: <001a01c2d055$e155cf50$0e01a8c0@bunyip>
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Status:   

I was going to set up a telecon to discuss issues relating to the
Registry. Then I wondered if it might be better to have a face-to-face
meeting first followed by one- or two-weekly telecons. 

It would need to be soon to get the ball rolling and I was going to
suggest somewhere in London in mid-March (Elizabeth could probably
arrange a meeting room somewhere at UCL) since the date is fairly soon
and London is relatively central between US and Europe and easy to get
to.

So, what do people think? Face-to-face meeting or telecon to kick off?
(Possible agendas for each listed below.)

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

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

As for an agenda for a face-to-face meeting, I was thinking of:

1. Registry options (presentations):
1.1 OAI
1.2 GLU
1.3 WS-I & UDDI
1.4 JINI
1.5 ?? - some grid-based registry/ies
1.6 ?? - agent-based technology/ies

2. Identification options (presentations):
2.1 ...

3. Scope of IVOA Registry standards (discussion)
3.1 Vision
3.2 Specifications required

4. Linking IVOA to Astro & Grid standards
4.1 FIPS, etc
4.2 Globus, GGF, etc

5. Use Cases
5.1 Brainstorm registry functional subdivisions
5.2 Working groups to develop use cases for each subdivision

5. Organisation & Roadmap (discussion)
5.1 Meetings & Telecons
5.2 Schedule
5.3 Publishable roadmap

With the extent of the agenda, we'll probably need two days. 

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

If we cannot do a face-to-face meeting, the agenda for the first telecon
could be something like:

1. Registry options:
1.1 list of possible options
1.2 volunteers to write paper on each option
1.3 deadlines for each paper

2. Scope of IVOA Registry standards
2.1 brief discussion
2.2 volunteer to write Vision document
2.3 volunteer to write Scope and draft specs list

3. Use cases
3.1 list of functional areas
3.2 volunteers to form working groups to develop use cases per area
3.3 deadlines for each use case set

4. Organisation and roadmap
4.1 meetings and telecons: schedule
4.2 items for roadmap

The following few meetings will be a matter of putting more detail on
the Scope and Options documents, then reviewing the use cases and then
working on the standards.

The identification issue needs to be raised as well but may need more
bouncing around on the mailing list before we're at a point of having
options to discuss.

From - Mon Feb 10 17:21:29 2003
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Status:   

Hello everybody,

A face to face meeting would be very nice for dicussions.
A telecon is perhaps not the best way to initiate the work.
But it is just what i mean.

regards

André

Robert Hanisch wrote:

> Hi Tony, et al.  The other option is to work first by telecon, then use the
> week of May 12-16, when we have already planned to have various technical
> WGs meet prior to a joint session on May 15-16 in Cambridge, UK.
>
> Other opinions?
>
> Bob
>
> ----- Original Message -----
> From: "Tony Linde" <ael@star.le.ac.uk>
> To: "'Registry_Ivoa_List'" <registry@ivoa.net>
> Sent: Sunday, February 09, 2003 11:11 AM
> Subject: Meeting
>
> > I was going to set up a telecon to discuss issues relating to the
> > Registry. Then I wondered if it might be better to have a face-to-face
> > meeting first followed by one- or two-weekly telecons.
> >
> > It would need to be soon to get the ball rolling and I was going to
> > suggest somewhere in London in mid-March (Elizabeth could probably
> > arrange a meeting room somewhere at UCL) since the date is fairly soon
> > and London is relatively central between US and Europe and easy to get
> > to.
> >
> > So, what do people think? Face-to-face meeting or telecon to kick off?
> > (Possible agendas for each listed below.)
> >
> > 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
> >
> > ========================
> >
> > As for an agenda for a face-to-face meeting, I was thinking of:
> >
> > 1. Registry options (presentations):
> > 1.1 OAI
> > 1.2 GLU
> > 1.3 WS-I & UDDI
> > 1.4 JINI
> > 1.5 ?? - some grid-based registry/ies
> > 1.6 ?? - agent-based technology/ies
> >
> > 2. Identification options (presentations):
> > 2.1 ...
> >
> > 3. Scope of IVOA Registry standards (discussion)
> > 3.1 Vision
> > 3.2 Specifications required
> >
> > 4. Linking IVOA to Astro & Grid standards
> > 4.1 FIPS, etc
> > 4.2 Globus, GGF, etc
> >
> > 5. Use Cases
> > 5.1 Brainstorm registry functional subdivisions
> > 5.2 Working groups to develop use cases for each subdivision
> >
> > 5. Organisation & Roadmap (discussion)
> > 5.1 Meetings & Telecons
> > 5.2 Schedule
> > 5.3 Publishable roadmap
> >
> > With the extent of the agenda, we'll probably need two days.
> >
> > ===============================
> >
> > If we cannot do a face-to-face meeting, the agenda for the first telecon
> > could be something like:
> >
> > 1. Registry options:
> > 1.1 list of possible options
> > 1.2 volunteers to write paper on each option
> > 1.3 deadlines for each paper
> >
> > 2. Scope of IVOA Registry standards
> > 2.1 brief discussion
> > 2.2 volunteer to write Vision document
> > 2.3 volunteer to write Scope and draft specs list
> >
> > 3. Use cases
> > 3.1 list of functional areas
> > 3.2 volunteers to form working groups to develop use cases per area
> > 3.3 deadlines for each use case set
> >
> > 4. Organisation and roadmap
> > 4.1 meetings and telecons: schedule
> > 4.2 items for roadmap
> >
> > The following few meetings will be a matter of putting more detail on
> > the Scope and Options documents, then reviewing the use cases and then
> > working on the standards.
> >
> > The identification issue needs to be raised as well but may need more
> > bouncing around on the mailing list before we're at a point of having
> > options to discuss.
> >
> >


From - Mon Feb 10 17:16:41 2003
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From: "Robert Hanisch" <hanisch@stsci.edu>
To: <registry@ivoa.net>
References: <001a01c2d055$e155cf50$0e01a8c0@bunyip>
Subject: Re: Meeting
Date: Mon, 10 Feb 2003 11:12:12 -0500
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Status:   

Hi Tony, et al.  The other option is to work first by telecon, then use the
week of May 12-16, when we have already planned to have various technical
WGs meet prior to a joint session on May 15-16 in Cambridge, UK.

Other opinions?

Bob

----- Original Message -----
From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Sent: Sunday, February 09, 2003 11:11 AM
Subject: Meeting


> I was going to set up a telecon to discuss issues relating to the
> Registry. Then I wondered if it might be better to have a face-to-face
> meeting first followed by one- or two-weekly telecons.
>
> It would need to be soon to get the ball rolling and I was going to
> suggest somewhere in London in mid-March (Elizabeth could probably
> arrange a meeting room somewhere at UCL) since the date is fairly soon
> and London is relatively central between US and Europe and easy to get
> to.
>
> So, what do people think? Face-to-face meeting or telecon to kick off?
> (Possible agendas for each listed below.)
>
> 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
>
> ========================
>
> As for an agenda for a face-to-face meeting, I was thinking of:
>
> 1. Registry options (presentations):
> 1.1 OAI
> 1.2 GLU
> 1.3 WS-I & UDDI
> 1.4 JINI
> 1.5 ?? - some grid-based registry/ies
> 1.6 ?? - agent-based technology/ies
>
> 2. Identification options (presentations):
> 2.1 ...
>
> 3. Scope of IVOA Registry standards (discussion)
> 3.1 Vision
> 3.2 Specifications required
>
> 4. Linking IVOA to Astro & Grid standards
> 4.1 FIPS, etc
> 4.2 Globus, GGF, etc
>
> 5. Use Cases
> 5.1 Brainstorm registry functional subdivisions
> 5.2 Working groups to develop use cases for each subdivision
>
> 5. Organisation & Roadmap (discussion)
> 5.1 Meetings & Telecons
> 5.2 Schedule
> 5.3 Publishable roadmap
>
> With the extent of the agenda, we'll probably need two days.
>
> ===============================
>
> If we cannot do a face-to-face meeting, the agenda for the first telecon
> could be something like:
>
> 1. Registry options:
> 1.1 list of possible options
> 1.2 volunteers to write paper on each option
> 1.3 deadlines for each paper
>
> 2. Scope of IVOA Registry standards
> 2.1 brief discussion
> 2.2 volunteer to write Vision document
> 2.3 volunteer to write Scope and draft specs list
>
> 3. Use cases
> 3.1 list of functional areas
> 3.2 volunteers to form working groups to develop use cases per area
> 3.3 deadlines for each use case set
>
> 4. Organisation and roadmap
> 4.1 meetings and telecons: schedule
> 4.2 items for roadmap
>
> The following few meetings will be a matter of putting more detail on
> the Scope and Options documents, then reviewing the use cases and then
> working on the standards.
>
> The identification issue needs to be raised as well but may need more
> bouncing around on the mailing list before we're at a point of having
> options to discuss.
>
>

From - Mon Feb 10 17:33:32 2003
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Date: Mon, 10 Feb 2003 16:20:38 +0000 (GMT)
From: Elizabeth Auden <eca@mssl.ucl.ac.uk>
To: Robert Hanisch <hanisch@stsci.edu>
cc: registry@ivoa.net
Subject: Re: Meeting
In-Reply-To: <00b901c2d11f$2be82260$7deca782@stsci.edu>
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Hello, 

> Hi Tony, et al.  The other option is to work first by telecon, then use the
> week of May 12-16, when we have already planned to have various technical
> WGs meet prior to a joint session on May 15-16 in Cambridge, UK.
> 
> Other opinions?

Could I suggest that instead of spoken telecons, we have agreed times to
discuss issues over the ivoa or astrogrid forums?  That way, the registry
workgroup would have a written record of discussions and decisions;
sometimes the finer nuances of a discussion can be lost in the write up of
telecon minutes.

As for the face to face meeting, I am happy to organize something at UCL
in mid-March or wait until the dedicated week at Cambridge.

Cheers,
Elizabeth


From - Mon Feb 10 17:35:57 2003
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From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: Tony Linde <ael@star.le.ac.uk>
cc: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: Re: Meeting
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Hi Tony,

> So, what do people think? Face-to-face meeting or telecon to kick off?
> (Possible agendas for each listed below.)

Was this (in lieu of) the focus meeting you metioned earlier?  (I had the 
impression that you intended this as more of a local meeting.)

For myself, March is a little close to squeeze in another meeting--the 
month is pretty booked.  The May meeting I can work in.  A cross-atlantic 
telecon would be great at some point.  

cheers,
Ray


From - Tue Feb 11 10:06:42 2003
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Date: Tue, 11 Feb 2003 10:04:34 +0100
From: Marco Leoni <Marco.Leoni@eso.org>
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Hi Tony,
    sorry for the late answer, I'm just arrived from Italy.

I would also prefer a face-to-face as bootstrap meeting....mid-March or 
May are both ok for me.


Cheers,
    Marco


Tony Linde wrote:

>I was going to set up a telecon to discuss issues relating to the
>Registry. Then I wondered if it might be better to have a face-to-face
>meeting first followed by one- or two-weekly telecons. 
>
>It would need to be soon to get the ball rolling and I was going to
>suggest somewhere in London in mid-March (Elizabeth could probably
>arrange a meeting room somewhere at UCL) since the date is fairly soon
>and London is relatively central between US and Europe and easy to get
>to.
>
>So, what do people think? Face-to-face meeting or telecon to kick off?
>(Possible agendas for each listed below.)
>
>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
>
>========================
>
>As for an agenda for a face-to-face meeting, I was thinking of:
>
>1. Registry options (presentations):
>1.1 OAI
>1.2 GLU
>1.3 WS-I & UDDI
>1.4 JINI
>1.5 ?? - some grid-based registry/ies
>1.6 ?? - agent-based technology/ies
>
>2. Identification options (presentations):
>2.1 ...
>
>3. Scope of IVOA Registry standards (discussion)
>3.1 Vision
>3.2 Specifications required
>
>4. Linking IVOA to Astro & Grid standards
>4.1 FIPS, etc
>4.2 Globus, GGF, etc
>
>5. Use Cases
>5.1 Brainstorm registry functional subdivisions
>5.2 Working groups to develop use cases for each subdivision
>
>5. Organisation & Roadmap (discussion)
>5.1 Meetings & Telecons
>5.2 Schedule
>5.3 Publishable roadmap
>
>With the extent of the agenda, we'll probably need two days. 
>
>===============================
>
>If we cannot do a face-to-face meeting, the agenda for the first telecon
>could be something like:
>
>1. Registry options:
>1.1 list of possible options
>1.2 volunteers to write paper on each option
>1.3 deadlines for each paper
>
>2. Scope of IVOA Registry standards
>2.1 brief discussion
>2.2 volunteer to write Vision document
>2.3 volunteer to write Scope and draft specs list
>
>3. Use cases
>3.1 list of functional areas
>3.2 volunteers to form working groups to develop use cases per area
>3.3 deadlines for each use case set
>
>4. Organisation and roadmap
>4.1 meetings and telecons: schedule
>4.2 items for roadmap
>
>The following few meetings will be a matter of putting more detail on
>the Scope and Options documents, then reviewing the use cases and then
>working on the standards.
>
>The identification issue needs to be raised as well but may need more
>bouncing around on the mailing list before we're at a point of having
>options to discuss.
>

From - Wed Feb 12 13:51:17 2003
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From: genova@cluster.u-strasbg.fr (Francoise Genova)
To: registry@ivoa.net
Cc: genova@newb6.u-strasbg.fr
Subject: FAQ at CDS
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Status:   

and your questions are welcome!
Francoise

From - Wed Feb 12 13:54:55 2003
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Date: Wed, 12 Feb 2003 13:57:06 +0100
From: Andre Schaaff <schaaff@newb6.u-strasbg.fr>
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Organization: CDS
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To: Clive Page <cgp@star.le.ac.uk>
CC: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: Re: Presentation on GLU
References: <Pine.LNX.4.44L0.0302121138130.7335-100000@peneca.star.le.ac.uk>
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Status:   

Hello everybody,

I agree with Clive that the FAQ is very easy to understand.

The CDS Web Services Portal is available at :

http://cdsweb.u-strasbg.fr/cdsws.gml

The Sesame name resolver is validated and you can use it as a Web Service.
Functionnalities of GLU will be added each week.
Send us your questions and the FAQ will grow.

Regards,

André

Clive Page wrote:

> Since GLU has been working for some years, and it provides much of the
> required functionality of the VO Registry, it is an obvious candidate for
> study by those desigining the next generation Registry.  I just came
> across a useful presentation on how GLU works, by Pierre Fernique of CDS,
> in a PDF file at: http://cdsweb.u-strasbg.fr/meeting1/GLU.pdf
>
> Other presentations on SOAP and related subjects from the same meeting are
> accessible from http://cdsweb.u-strasbg.fr/meeting1/planning_en.htm
> (note: some of them are in French).
>
> I also found the FAQ on Web Services at CDS particularly easy to
> understand (this page is in English):
> http://cdsweb.u-strasbg.fr/faq.gml
>
> Enjoy,
>
> --
> Clive Page,
> Dept of Physics & Astronomy,
> University of Leicester,    Tel +44 116 252 3551
> Leicester, LE1 7RH,  U.K.   Fax +44 116 252 3311


From - Wed Feb 12 12:49:55 2003
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From: Clive Page <cgp@star.le.ac.uk>
To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: Presentation on GLU
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Status:   

Since GLU has been working for some years, and it provides much of the
required functionality of the VO Registry, it is an obvious candidate for
study by those desigining the next generation Registry.  I just came
across a useful presentation on how GLU works, by Pierre Fernique of CDS,
in a PDF file at: http://cdsweb.u-strasbg.fr/meeting1/GLU.pdf

Other presentations on SOAP and related subjects from the same meeting are
accessible from http://cdsweb.u-strasbg.fr/meeting1/planning_en.htm
(note: some of them are in French).

I also found the FAQ on Web Services at CDS particularly easy to
understand (this page is in English):
http://cdsweb.u-strasbg.fr/faq.gml

Enjoy,

-- 
Clive Page,
Dept of Physics & Astronomy,
University of Leicester,    Tel +44 116 252 3551
Leicester, LE1 7RH,  U.K.   Fax +44 116 252 3311

From - Fri Feb 14 00:05:34 2003
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Hello,

Concerning the march meeting, is something decided ?
I think that, even if some people prefer a telecon, it would be nice to
organize somthing for others who want to be physically present in UK.
A telecon with too many (distributed) people is not the best way for a
kickoff meeting.

Regards,

André



From - Sun Feb 16 13:20:39 2003
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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: Query message format
Date: Sun, 16 Feb 2003 12:16:24 -0000
Organization: University of Leicester
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Status:   

I've just proposed to the AstroGrid group that we base the format of
messages containing queries (eg from client, portal or workflow
component to registry or dataset) on the W3C XQuery standard:

http://forum.astrogrid.org/read.php?TID=314&page=#971

I know there's no way that IVOA could determine a standard in time for
AstroGrid (we need it now) but I wanted to find out if anyone knew of
any 'just cause or impediment' why we should not use XQuery. 

Note that I'm not proposing XQuery as the Astronomical Query Language
(ie something that an astronomer would type into a query processor) but
as the format in which such a query would be passed from one component
to another.

Have a read of my proposal and let us know if there are any strong
objections. We'll add any comments here to those of the AstroGrid group
in the forum when our Technical Support Panel discusses the issue on
27th Feb.

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 Feb 17 16:35:42 2003
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From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: Registry workgroup kickoff meeting
Date: Mon, 17 Feb 2003 15:30:56 -0000
Organization: University of Leicester
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There were mixed comments about holding a face-to-face kickoff meeting
but there seemed to be sufficient interest and the benefits of setting
the scope and workload of the group in such a meeting were great enough
that we've set the meeting up. I do hope that at least a couple of the
US participants to this list can make it.

Many thanks to Elizabeth Auden for chasing up a suitable venue in
London. It will be held at the London e-Science Centre
(http://www.lesc.ic.ac.uk/) on 19-20 March, starting around midday on
the 19th and finishing around 15:00 on the 20th. (No, it cannot be moved
- this was the only location and date we could get.)

To quote from the LeSC Ops Manager: 'the room we have booked for you has
seating for over 30, with a number of desks. There is one projector
screen and a large white board. There is no video projector currently in
the room, but we can supply one, or you could bring one if you'd rather.
All rooms are equipped with wireless networking.'

I'll gather opinions about the structure of the meeting and likely
topics over the next few days but wanted to get this message up asap to
give people a chance to look at their arrangements for then.

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 Feb 17 19:05:43 2003
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Message-ID: <03d101c2d6ae$d6a6e2b0$6401a8c0@cacr.caltech.edu>
From: "Roy Williams" <roy@cacr.caltech.edu>
To: <metadata@us-vo.org>, <registry@ivoa.net>
Subject: OAI repository of Cone Search Implementations
Date: Mon, 17 Feb 2003 10:03:13 -0800
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I have built a new OAI repository of the Cone Search services. The
information is copied from Alex's registry.

There are (at least) two ways to look at the repository, by going to
it directly (1), or for a nicer styled view, use the Repository
Explorer at Virginia Tech (2).

(1) The repository is hosted at
http://mercury.cacr.caltech.edu:8080/oaicat/index.html
There are some forms that let you make requests, and see responses in
XML.

(2) Go to the Repository Explorer at Virginia Tech
http://oai.dlib.vt.edu/cgi-bin/Explorer/oai2.0/testoai
then scroll through the list of online repositories and you will find
"NVO Cone Search Repository". Once this is selected, you can use the
forms to explore the repository.

Notes

(a) When you select the ListIdentifiers and ListRecords verbs, you
need to specify the metadata format in which results should be
returned. In this case there is only Dublin Core -- you type "oai_dc"
in the metadataPrefix box.

(b) A typical identifier in this repository is:
    oai:conesearch.us-vo.org:00000009.xml
meaning in English "the 9th entry in the URI conesearch.us-vo.org, and
by the way it is an OAI identifier".

(c) I made an attempt (that is not optimal) to convert the info in
Alex's registry to the Dublin Core standard, as follows:
Service Name -> dc:Title
Responsible Party -> dc:Creator
Instrument -> dc:Publisher
Waveband -> dc:Type
Coverage -> dc:Coverage
BaseURL -> dc:Description

(d) In making the conversion from Alex's metadata to DC metadata, I
discovered that we scientists cannot resist attaching URLs to
everything. When the form asks for Name, people put in HTML mailto
tags as well. When it says coverage, they use HTML to point to an
image of the coverage. In our future metadata schemas, we must take
account of this tendency!

(e) This is just an illustration of how OAI can work for us, it is not
meant to be cast in concrete. The object of the exercise is to let us
think about how things should work in the fully elaborated system.

Roy

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

From - Mon Feb 17 23:40:43 2003
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Date: Mon, 17 Feb 2003 16:40:15 -0600 (CST)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: Tony Linde <ael@star.le.ac.uk>
cc: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: Re: Query message format
In-Reply-To: <000a01c2d5b5$39a0c6b0$0e01a8c0@bunyip>
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Hi Tony,

> I've just proposed to the AstroGrid group that we base the format of
> messages containing queries (eg from client, portal or workflow
> component to registry or dataset) on the W3C XQuery standard:
> 
> Note that I'm not proposing XQuery as the Astronomical Query Language
> (ie something that an astronomer would type into a query processor) but
> as the format in which such a query would be passed from one component
> to another.

In my opinion, the most important requirement of the query interchange 
format is that it be easily converted into other forms.  When distributing 
queries to many queryable services, you want the service implementer to be 
able to leverage off of existing capabilities as much as possible.  This 
will mean converting the query into the form currently supported by the 
repository.  This could include
   *  an SQL query to a relational database
   *  an XML Query to an XML database
   *  an ASU query to an ASU interface
   *  an SIA query to an SIA interface
   *  a JVO query to the JVO grid.  

The conversion is not just a matter of transforming the syntax, of course.  
To leverage these existing systems, it will also involve transforming 
the metadata schema used in the query from some standard schema (e.g. like 
SIA's use of POS=...) into the schema supported by the local database.  

In my mind, if you want a message to be easily converted into another 
form, it should be in XML.  This allows one to develop XSL stylesheets 
to do the transformation.  (In fact, the XSL stylesheets could be created 
automatically from an XML-based configuration file.)  The fact that an XML 
Query itself is not XML makes it difficult to transform into other forms.

Brian Thomas and Ed Shaya have been working on a white paper 
(http://nvo.gsfc.nasa.gov/QueryMediator/) exploring a query framework 
based on an XML-encoded query syntax which I think could meet the 
requirement of easy conversion.  We hope to experiment with this in the 
coming months.  

The use of an XML-encoded query as a query interchange format does not 
preclude AstroGrid's use of XML Query as its interchange format, 
particularly in the near-term.  The idea is that it would be 
straightforward, in theory, to transform the XML-encoded query 
into XML Query and thereby accept queries from "outside" AstroGrid.  

cheers,
Ray



From - Tue Feb 18 00:10:43 2003
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Date: Mon, 17 Feb 2003 17:09:17 -0600 (CST)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: registry@ivoa.net
Subject: OAI for VO registries
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Hi,

I've written a document entitled "An Evaluation of the Open Archives 
Initiative for VO Registries" which I've posted in the NVO Doc repository 
and the IVOA wiki site:

  http://bill.cacr.caltech.edu/cfdocs/usvo-pubs/files/evaloai.html
  http://www.ivoa.net/internal/IVOA/RegistryRequirements/evaloai.html

For those of you who saw an earlier draft, this final version completes 
the sections on "Fit to Requirements" and "Conclusions and 
Recommendations".  

The abstract is below.

cheers,
Ray

An Evaluation of the Open Archives Initiative for VO Registries

Abstract
The Open Archives Initiative is an effort within the digital library 
community to develop and promote interoperability standards that enable 
the dissemination of electronic content. At the core of the Initiative is 
the Protocal for Metadata Harvesting (PMH) standard through which a data 
repository can publish metadata about its holdings. While its heritage is 
in supporting "e-print" repositories, the intended market is clearly 
broader and could be used to publish any kind of data. In this document, I 
give an overview of the Harvesting Protocoal, evaluating it in terms of VO 
registry requirements. In conclusion, I make some recommendations about 
how OAI may be applied to VO registry applications. The OAI PMH does not 
address all of our requirements; however, it does have some nice features 
that could be made part of our overall registry solution.



From - Wed Feb 19 13:37:41 2003
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Date: Wed, 19 Feb 2003 12:26:30 +0000 (GMT)
From: Anita Richards <amsr@jb.man.ac.uk>
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Subject: Registry workgroup kickoff meeting
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> Many thanks to Elizabeth Auden for chasing up a suitable venue in
> London. It will be held at the London e-Science Centre
> (http://www.lesc.ic.ac.uk/) on 19-20 March, starting around midday on
> the 19th and finishing around 15:00 on the 20th. (No, it cannot be moved
> - this was the only location and date we could get.)

Would it be possible to start early on 19th and have it one-day (ie travel
the night before? This is purely selfish, so if I am the only one it suits
never mind... but maybe it would suit people coming from further to arrive
the night before and not to be at the mercy of long-distance travel at the
start of the meeting.

thanks

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 - Wed Feb 19 16:08:56 2003
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From: "Robert Hanisch" <rjhanisch@earthlink.net>
To: <registry@ivoa.net>
Subject: Re: Registry workgroup kickoff meeting
Date: Wed, 19 Feb 2003 10:06:06 -0500
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Elizabeth, Tony,

  Would it be possible to set up a telecon for this meeting?  If it =
starts mid-day on the 19th, it is not too unreasonable for US people to =
join, at least for the first day.

Cheers,
Bob
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<DIV><FONT face=3DArial size=3D2>Elizabeth, Tony,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp; Would it be possible to set up a =
telecon for=20
this meeting?&nbsp; If it starts mid-day on the 19th, it is not too =
unreasonable=20
for US people to join, at least for the first day.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Cheers,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Bob</FONT></DIV></BODY></HTML>

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From - Wed Feb 19 16:18:56 2003
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Date: Wed, 19 Feb 2003 15:12:12 +0000 (GMT)
From: Clive Page <cgp@star.le.ac.uk>
To: registry@ivoa.net
Subject: Re: Registry workgroup kickoff meeting
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On Wed, 19 Feb 2003, Robert Hanisch wrote:

>   Would it be possible to set up a telecon for this meeting?  If it
> starts mid-day on the 19th, it is not too unreasonable for US people to
> join, at least for the first day.

Just an idea: I wonder if the London e-science centre has an AccessGrid
node, so we can turn the meeting into a video-conference?

-- 
Clive Page,
Dept of Physics & Astronomy,
University of Leicester,    Tel +44 116 252 3551
Leicester, LE1 7RH,  U.K.   Fax +44 116 252 3311

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Date: Wed, 19 Feb 2003 09:14:34 -0600 (CST)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: registry@ivoa.net
Subject: Re: Registry workgroup kickoff meeting
In-Reply-To: <01ec01c2d828$6ea8c180$5568f7a5@stsci.edu>
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>   Would it be possible to set up a telecon for this meeting?  If it 
> starts mid-day on the 19th, it is not too unreasonable for US people to 
> join, at least for the first day.  

I would very much like to participate, but it would have to be by telecon.

cheers,
Ray


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From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: Clive Page <cgp@star.le.ac.uk>
cc: registry@ivoa.net
Subject: Re: Registry workgroup kickoff meeting
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> Just an idea: I wonder if the London e-science centre has an AccessGrid
> node, so we can turn the meeting into a video-conference?

that would be great for me!

cheers,
Ray


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From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: registry@ivoa.net
Subject: IDs: summary of NVO telecon discussion
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Hi IVOA-ers,

You might recall the email discussion we've been IDs.  Issues discussed 
included requirements for IDs, what it means for two instances of an 
ID to be identical, and when should an ID be reused when an object is 
replicated within the VO grid.  An overarching theme of the discussion is 
the scope of an ID framework: what are IDs meant to accomplish?

In an attempt to clarify the scope, the NVO MWG took up this topic in its 
telecon on Feb. 6th.  The goal was to come to some consensus (within the 
NVO project) about what IDs are meant to accomplish, and use this 
consensus to pare down a set of proposed requirements.  The purpose of 
this message is to share the results of this discussion with the wider 
community.  Your comments are welcome.

The minutes of the meeting are accessible via 
http://archives.us-vo.org/metadata/0597.html.  The main points we were 
able to agree on are as follows:

  1.  The primary goal of an ID is to allow retrieval of a unique 
      description of an object or concept given its ID.
	*  while a particular ID may reflect ownership, containment, 
	   and/or derivation, the system need not depend on it.
        *  in general, relationships between entities are determined 
           definitively via an examination of the metadata. 

  2.  The ID framework should maximize freedom of data providers to
      choose identifiers.
        * Providers should control what their various IDs refer to 
          (resources, missions, datasets, services, etc.).
        * Providers should control a namespace that can be used to turn 
          local identifiers into global ones.
        * The framework should minimize the requirements on the form of a 
          local identifier. 

  3.  Services specify a use of an identifier should be as specific as 
      possible as to what the identifier should refer to (e.g. an image,
      a version of an image, the collection an image derives from, etc.)

These assertions were folded into our (now reduced) set of proposed 
requirements on IDs which is available via 
http://rai.ncsa.uiuc.edu/~rplante/VO/metadata/oidreq.txt.

We certainly don't consider the above assertions, nor the resulting 
requirements, to be the final say on the topic.  In particular, there are 
some issues regarding handling persistant names that could use some work.  
I expect that our understanding of the role of identifiers will change a 
bit as we play with identifier specifications and experiment with 
prototype registries.  

cheers,
Ray


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From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Ray Plante'" <rplante@ncsa.uiuc.edu>, <registry@ivoa.net>
Subject: RE: towards an ID spec
Date: Wed, 19 Feb 2003 21:29:23 -0000
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Hi Ray,

(In the following I refer to everything within the registry as a service
whether a data source, software, etc. since everything must be
accessible via a grid/web service.)

First a question: why do we need to use a single string to identify
registered services? How about:

<serviceID>
  <authorityID>http://www.star.le.ac.uk/ledas/registry</authorityID>
  <serviceKey>xmm/catalogABC/datasetXYZ</serviceKey>
</serviceID>

Or

<serviceID>
  <authorityID>http://casu.cam.ac.uk/registry</authorityID>
  <serviceKey>AE1F7FB0-A5F8-11D5-A30A-002035229C64</serviceKey>
</serviceID>

I think we need to stick with some form of URL format for the registry
authority but the service key within that could be entirely up to the
registry to determine.

I'm quite averse to having any 'meaning' attached to the serviceID such
as the first part being the address of the registry (what if LEDAS
change to http://ledas.star.le.ac.uk - what happens to all its
registered services?) and the stuff after the '/' being some other type
of structure. If we want to store such information, we should create
other fields in the metadata for it. 

I don't see that 'ivoaid:' adds anything. If we use a serviceID within
the VO then it will have been registered. 

If you want to enclose or include one type of service within another we
should add some form of relationship metadata, so a service could
include:

<relationships>
  <relationship type="include">
    <serviceID>
      <authorityID>http://casu.cam.ac.uk/registry</authorityID>
      <serviceKey>AE1F7FB0-A5F8-11D5-A30A-002035229C64</serviceKey>
    </serviceID>
  </relationship>
  <relationship type="derivedFrom">
    <serviceID>
      <authorityID>http://www.star.le.ac.uk/ledas/registry</authorityID>
      <serviceKey>xmm/catalogABC/datasetXYZ</serviceKey>
    </serviceID>
  </relationship>
</relationships>

> Thus, you can always learn something about an ID.

But NOT from the ID itself - it will point to metadata - that is where
you learn about the service. An ID must be unique and never changing -
as soon as you ascribe meaning to any part of it then you hit problems
as soon as that meaning changes - and it will!

The same applies to the 'mirrors' discussion. If you want to say that
one service mirrors another, then just say so:

<relationships>
  <relationship type="mirrors">
    <serviceID>
      <authorityID>http://casu.cam.ac.uk/registry</authorityID>
      <serviceKey>AE1F7FB0-A5F8-11D5-A30A-002035229C64</serviceKey>
    </serviceID>
  </relationship>
</relationships>

There is no need to try to encode this in the ID.

Bottom line is that we should not have any type of encoding information
in the ID. This is something the XML community has learned in its
standards on namespaces. A namespace may look like a URL but it does not
resolve to a path within a server - it is completely meaningless - it
only acts as a unique unchanging identifier for that namespace.

Cheers,
Tony.

> -----Original Message-----
> From: Ray Plante [mailto:rplante@poplar.ncsa.uiuc.edu] 
> Sent: 19 February 2003 19:56
> To: registry@ivoa.net
> Subject: towards an ID spec
> 
> 
> Hi,
> 
> I'm working on a proposal for a specification of unique 
> identifiers for the IVOA.  (You can peek at my gory notes thus far at
> http://rai.ncsa.uiuc.edu/~rplante/VO/metadata/oidspec.txt.)  
> There are a few items in particular that I'm looking for 
> feedback on now.  These items will be a topic of discussion 
> at this week's NVO MWG telecon; however, broader feedback via 
> email would be very helpful.
> 
> The general gist of the spec is that any ID that conforms to 
> the IETF standard for URIs may be used as a global 
> identifier.  However, IDs that start with "ivoaid:" (or 
> whatever we want to call it) imply certain things--principly 
> that it has been registered in some form. Use of the "ivoaid" 
> scheme would impose additional requirements on the ID and 
> what you can do with it.  I also  attempt to incorporate 
> Arnold's ideas for addressing mirrors and location-independent names.
> 
> The first issue I'm wondering about is which URI form we want 
> to go with for "ivoaid" IDs.  We should probably go with one 
> of the two common forms of URI refered to in the standard 
> (http://www.ietf.org/rfc/rfc2396.txt)...
> 
>   1) URN syntax:    
>      e.g. urn:ncsa.uiuc.edu:ADIL:95.DR.01
> 
>        * a colon (:) is the primary delimiter 
>        * commonly used in the digial library world
>        * (we're not restricted to using "urn" as the leading scheme)
> 
>   2) a net-based form of the generic syntax:  
>      e.g.  ivoaid://ncsa.uiuc.edu/ADIL/95.DR.01
> 
>        * a slash (/) is the primary delimiter
>        * commonly used in the Web/XML world
> 
> Which do people prefer?  I am partial to the second one 
> myself (based on what I'm prosing to do with it); however, I 
> don't think it matters that much either way.  I'd like to 
> hear other people's opinions, particularly in light of the 
> 2nd issue below.
> 
> The 2nd issue concerns using an ID to retrieve descriptions 
> of things.  In general, I don't think it's a good idea to 
> require that all "ivoaid:" IDs have a registered, retrievable 
> description associated with it.  That is, you may want to 
> refer to an image in a collection with an "ivoaid:" ID (say, 
> in an SIA query result) but not bother to actually register 
> it explicitly.  This may be because:
> 
>    *  you've got too many images and it would be too much work
>    *  the image or its ID is not persistant
>    *  the collection contents is changing all the time.
> 
> Instead, we would simply require that at least one of its 
> enclosing collections be registered.  To make it possible to 
> learn about an ID, whether it is explicitly registered or 
> not, I propose that the authority that issues the ID support 
> a "Describe" service that works as follows:
> 
>    1. suppose I have an image ID of the form, 
>         ivoaid://ncsa.uiuc.edu/ADIL/95.DR.01.01
>    2. I give this ID to the service.  If that ID is registered
>         explicitly, its description is returned.
>    3. If that ID is not registered, the service looks for its
>         enclosing colletion, ivoaid://ncsa.uiuc.edu/ADIL.
>    4. The hierarchy is ascended until a description is found.  At a 
>         minimum, the top level, ivoaid://ncsa.uiuc.edu, must be
>         registered. 
> 
> Thus, you can always learn something about an ID.
> 
> My questions on this issue are:
>   o  Should we require that all "ivoaid:" IDs be explicitly
>      registered, or can we get away with just requiring registration,
>      at the least, of one of the enclosing collections?
>   o  Is the "fall-back" Describe service a good idea?
>   o  If so, it requires that / (or :, in the URN syntax) imply
>      containment.  Is this a problem?
>   o  Does the "fall-back" Describe functionality affect which URI form
>      we choose?
> 
> Now a 3rd issue (if you're still with me) is regarding 
> mirroring and data relocation.  Arnold proposed a 
> three-component ID of the form "L:P:D", where L=resource 
> location, P=project/service, and D=dataset (see 
> http://www.ivoa.net/forum/registry/0060.htm).  "L:P:D" points 
> to a specific instance of a dataset at a specific location.  
> "P:D" can be used as a location-independent ID for the 
> dataset which is resolvable to a location by querying a 
> registry for "P".  
> 
> I would propose folding this idea in in the following way.  
> Suppose SSDS hosts a collection with the ID, 
> "ivoaid://sdss.jhu.edu/SDSS/catalogs".
> And suppose STSci wants to mirror that collection.  It would 
> re-use the "SDSS/catalogs" part of the ID for its mirror 
> (that's the "P" part); it could register this as 
> "ivoaid://stsci.edu/mirrors/SDSS/catalogs".  Now suppose that 
> I want to access one of the items in this collection: 
> "SDSS/catalogs/extended" (that's the "P:D" part).  I would 
> resolve this to a list of locations using a "Match ID" 
> service of a registry. The registry would first look for all 
> IDs that end in
> "SDSS/catalogs/extended".   Since this is not registered, it won't
> find anything, so it ascends the ID and looks for IDs ending 
> in "SDSS/catalogs".  This would return both occurances: 
> "ivoaid://sdss.jhu.edu/SDSS/catalogs" and 
> "ivoaid://stsci.edu/mirrors/SDSS/catalogs". 
> 
> Note: just because 2 IDs share some portion does not by 
> itself indicate that they are mirrors.  To determine this 
> definitively, one would have to look at the metadata for the 
> two collections.  We can imagine specific metadata for 
> describing this.
> 
> Questions:
>   o  Is this a good framework for handling mirrors/data relocation
>   o  (Arnold:)  does this satisfy the requirements for
>      location-independent names (as needed by the journals)? 
> 
> I look forward to feedback.  We'll also talk about this at 
> this week's NVO MWG.
> 
> thanks,
> Ray
> 
> 

From - Thu Feb 20 09:43:58 2003
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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: <registry@ivoa.net>
Subject: RE: towards an ID spec
Date: Thu, 20 Feb 2003 08:41:27 -0000
Organization: University of Leicester
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Status:   

I'll start arguing with myself...

> (In the following I refer to everything within the registry 
> as a service whether a data source, software, etc. since 
> everything must be accessible via a grid/web service.)

But this does not mean every current service (eg cgi-based services)
must convert or implement wrapper web services. We could set up some
'routing' web services who's job is to convert a web service call to a
cgi-based (or whatever) one. Then the cgi-based service registers
itself, fills in the appropriate metadata, and puts the url of its
service as the routing service with first parameter being their own cgi
url.

> <serviceID>
>   <authorityID>http://www.star.le.ac.uk/ledas/registry</authorityID>
...

And this does not mean it has to be held as xml. I just used xml as it
is a good self-describing structure.

> I think we need to stick with some form of URL format for the 
> registry authority 

But only in the same sense as namespaces - ie, it is not the actual url
of the registry but is the serviceID (with null serviceKey) of that
registry. The url will be a separate piece of metadata.

Cheers,
Tony. 

> -----Original Message-----
> From: Tony Linde [mailto:ael@star.le.ac.uk] 
> Sent: 19 February 2003 21:29
> To: 'Ray Plante'; registry@ivoa.net
> Subject: RE: towards an ID spec
> 
> 
> Hi Ray,
> 
> (In the following I refer to everything within the registry 
> as a service whether a data source, software, etc. since 
> everything must be accessible via a grid/web service.)
> 
> First a question: why do we need to use a single string to 
> identify registered services? How about:
> 
> <serviceID>
>   <authorityID>http://www.star.le.ac.uk/ledas/registry</authorityID>
>   <serviceKey>xmm/catalogABC/datasetXYZ</serviceKey>
> </serviceID>
> 
> Or
> 
> <serviceID>
>   <authorityID>http://casu.cam.ac.uk/registry</authorityID>
>   <serviceKey>AE1F7FB0-A5F8-11D5-A30A-002035229C64</serviceKey>
> </serviceID>
> 
> I think we need to stick with some form of URL format for the 
> registry authority but the service key within that could be 
> entirely up to the registry to determine.
> 
> I'm quite averse to having any 'meaning' attached to the 
> serviceID such as the first part being the address of the 
> registry (what if LEDAS change to http://ledas.star.le.ac.uk 
> - what happens to all its registered services?) and the stuff 
> after the '/' being some other type of structure. If we want 
> to store such information, we should create other fields in 
> the metadata for it. 
> 
> I don't see that 'ivoaid:' adds anything. If we use a 
> serviceID within the VO then it will have been registered. 
> 
> If you want to enclose or include one type of service within 
> another we should add some form of relationship metadata, so 
> a service could
> include:
> 
> <relationships>
>   <relationship type="include">
>     <serviceID>
>       <authorityID>http://casu.cam.ac.uk/registry</authorityID>
>       <serviceKey>AE1F7FB0-A5F8-11D5-A30A-002035229C64</serviceKey>
>     </serviceID>
>   </relationship>
>   <relationship type="derivedFrom">
>     <serviceID>
>
<authorityID>http://www.star.le.ac.uk/ledas/registry</authorityID>
>       <serviceKey>xmm/catalogABC/datasetXYZ</serviceKey>
>     </serviceID>
>   </relationship>
> </relationships>
> 
> > Thus, you can always learn something about an ID.
> 
> But NOT from the ID itself - it will point to metadata - that 
> is where you learn about the service. An ID must be unique 
> and never changing - as soon as you ascribe meaning to any 
> part of it then you hit problems as soon as that meaning 
> changes - and it will!
> 
> The same applies to the 'mirrors' discussion. If you want to 
> say that one service mirrors another, then just say so:
> 
> <relationships>
>   <relationship type="mirrors">
>     <serviceID>
>       <authorityID>http://casu.cam.ac.uk/registry</authorityID>
>       <serviceKey>AE1F7FB0-A5F8-11D5-A30A-002035229C64</serviceKey>
>     </serviceID>
>   </relationship>
> </relationships>
> 
> There is no need to try to encode this in the ID.
> 
> Bottom line is that we should not have any type of encoding 
> information in the ID. This is something the XML community 
> has learned in its standards on namespaces. A namespace may 
> look like a URL but it does not resolve to a path within a 
> server - it is completely meaningless - it only acts as a 
> unique unchanging identifier for that namespace.
> 
> Cheers,
> Tony.
> 
> > -----Original Message-----
> > From: Ray Plante [mailto:rplante@poplar.ncsa.uiuc.edu]
> > Sent: 19 February 2003 19:56
> > To: registry@ivoa.net
> > Subject: towards an ID spec
> > 
> > 
> > Hi,
> > 
> > I'm working on a proposal for a specification of unique
> > identifiers for the IVOA.  (You can peek at my gory notes 
> thus far at
> > http://rai.ncsa.uiuc.edu/~rplante/VO/metadata/oidspec.txt.)  
> > There are a few items in particular that I'm looking for 
> > feedback on now.  These items will be a topic of discussion 
> > at this week's NVO MWG telecon; however, broader feedback via 
> > email would be very helpful.
> > 
> > The general gist of the spec is that any ID that conforms to
> > the IETF standard for URIs may be used as a global 
> > identifier.  However, IDs that start with "ivoaid:" (or 
> > whatever we want to call it) imply certain things--principly 
> > that it has been registered in some form. Use of the "ivoaid" 
> > scheme would impose additional requirements on the ID and 
> > what you can do with it.  I also  attempt to incorporate 
> > Arnold's ideas for addressing mirrors and 
> location-independent names.
> > 
> > The first issue I'm wondering about is which URI form we want
> > to go with for "ivoaid" IDs.  We should probably go with one 
> > of the two common forms of URI refered to in the standard 
> > (http://www.ietf.org/rfc/rfc2396.txt)...
> > 
> >   1) URN syntax:    
> >      e.g. urn:ncsa.uiuc.edu:ADIL:95.DR.01
> > 
> >        * a colon (:) is the primary delimiter 
> >        * commonly used in the digial library world
> >        * (we're not restricted to using "urn" as the leading scheme)
> > 
> >   2) a net-based form of the generic syntax:  
> >      e.g.  ivoaid://ncsa.uiuc.edu/ADIL/95.DR.01
> > 
> >        * a slash (/) is the primary delimiter
> >        * commonly used in the Web/XML world
> > 
> > Which do people prefer?  I am partial to the second one
> > myself (based on what I'm prosing to do with it); however, I 
> > don't think it matters that much either way.  I'd like to 
> > hear other people's opinions, particularly in light of the 
> > 2nd issue below.
> > 
> > The 2nd issue concerns using an ID to retrieve descriptions
> > of things.  In general, I don't think it's a good idea to 
> > require that all "ivoaid:" IDs have a registered, retrievable 
> > description associated with it.  That is, you may want to 
> > refer to an image in a collection with an "ivoaid:" ID (say, 
> > in an SIA query result) but not bother to actually register 
> > it explicitly.  This may be because:
> > 
> >    *  you've got too many images and it would be too much work
> >    *  the image or its ID is not persistant
> >    *  the collection contents is changing all the time.
> > 
> > Instead, we would simply require that at least one of its
> > enclosing collections be registered.  To make it possible to 
> > learn about an ID, whether it is explicitly registered or 
> > not, I propose that the authority that issues the ID support 
> > a "Describe" service that works as follows:
> > 
> >    1. suppose I have an image ID of the form, 
> >         ivoaid://ncsa.uiuc.edu/ADIL/95.DR.01.01
> >    2. I give this ID to the service.  If that ID is registered
> >         explicitly, its description is returned.
> >    3. If that ID is not registered, the service looks for its
> >         enclosing colletion, ivoaid://ncsa.uiuc.edu/ADIL.
> >    4. The hierarchy is ascended until a description is found.  At a 
> >         minimum, the top level, ivoaid://ncsa.uiuc.edu, must be
> >         registered.
> > 
> > Thus, you can always learn something about an ID.
> > 
> > My questions on this issue are:
> >   o  Should we require that all "ivoaid:" IDs be explicitly
> >      registered, or can we get away with just requiring 
> registration,
> >      at the least, of one of the enclosing collections?
> >   o  Is the "fall-back" Describe service a good idea?
> >   o  If so, it requires that / (or :, in the URN syntax) imply
> >      containment.  Is this a problem?
> >   o  Does the "fall-back" Describe functionality affect 
> which URI form
> >      we choose?
> > 
> > Now a 3rd issue (if you're still with me) is regarding
> > mirroring and data relocation.  Arnold proposed a 
> > three-component ID of the form "L:P:D", where L=resource 
> > location, P=project/service, and D=dataset (see 
> > http://www.ivoa.net/forum/registry/0060.htm).  "L:P:D" points 
> > to a specific instance of a dataset at a specific location.  
> > "P:D" can be used as a location-independent ID for the 
> > dataset which is resolvable to a location by querying a 
> > registry for "P".  
> > 
> > I would propose folding this idea in in the following way.
> > Suppose SSDS hosts a collection with the ID, 
> > "ivoaid://sdss.jhu.edu/SDSS/catalogs".
> > And suppose STSci wants to mirror that collection.  It would 
> > re-use the "SDSS/catalogs" part of the ID for its mirror 
> > (that's the "P" part); it could register this as 
> > "ivoaid://stsci.edu/mirrors/SDSS/catalogs".  Now suppose that 
> > I want to access one of the items in this collection: 
> > "SDSS/catalogs/extended" (that's the "P:D" part).  I would 
> > resolve this to a list of locations using a "Match ID" 
> > service of a registry. The registry would first look for all 
> > IDs that end in
> > "SDSS/catalogs/extended".   Since this is not registered, it won't
> > find anything, so it ascends the ID and looks for IDs ending 
> > in "SDSS/catalogs".  This would return both occurances: 
> > "ivoaid://sdss.jhu.edu/SDSS/catalogs" and 
> > "ivoaid://stsci.edu/mirrors/SDSS/catalogs". 
> > 
> > Note: just because 2 IDs share some portion does not by
> > itself indicate that they are mirrors.  To determine this 
> > definitively, one would have to look at the metadata for the 
> > two collections.  We can imagine specific metadata for 
> > describing this.
> > 
> > Questions:
> >   o  Is this a good framework for handling mirrors/data relocation
> >   o  (Arnold:)  does this satisfy the requirements for
> >      location-independent names (as needed by the journals)?
> > 
> > I look forward to feedback.  We'll also talk about this at
> > this week's NVO MWG.
> > 
> > thanks,
> > Ray
> > 
> > 
> 

From - Wed Feb 19 20:58:57 2003
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Date: Wed, 19 Feb 2003 13:55:43 -0600 (CST)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: registry@ivoa.net
Subject: towards an ID spec
Message-ID: <Pine.LNX.4.44.0302191353260.10893-100000@poplar.ncsa.uiuc.edu>
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Hi,

I'm working on a proposal for a specification of unique identifiers
for the IVOA.  (You can peek at my gory notes thus far at
http://rai.ncsa.uiuc.edu/~rplante/VO/metadata/oidspec.txt.)  There are
a few items in particular that I'm looking for feedback on now.  These
items will be a topic of discussion at this week's NVO MWG telecon;
however, broader feedback via email would be very helpful.

The general gist of the spec is that any ID that conforms to the IETF
standard for URIs may be used as a global identifier.  However, IDs
that start with "ivoaid:" (or whatever we want to call it) imply
certain things--principly that it has been registered in some form.
Use of the "ivoaid" scheme would impose additional requirements on the
ID and what you can do with it.  I also  attempt to incorporate
Arnold's ideas for addressing mirrors and location-independent
names.

The first issue I'm wondering about is which URI form we want to go
with for "ivoaid" IDs.  We should probably go with one of the two
common forms of URI refered to in the standard
(http://www.ietf.org/rfc/rfc2396.txt)...

  1) URN syntax:    
     e.g. urn:ncsa.uiuc.edu:ADIL:95.DR.01

       * a colon (:) is the primary delimiter 
       * commonly used in the digial library world
       * (we're not restricted to using "urn" as the leading scheme)

  2) a net-based form of the generic syntax:  
     e.g.  ivoaid://ncsa.uiuc.edu/ADIL/95.DR.01

       * a slash (/) is the primary delimiter
       * commonly used in the Web/XML world

Which do people prefer?  I am partial to the second one myself (based
on what I'm prosing to do with it); however, I don't think it matters
that much either way.  I'd like to hear other people's opinions,
particularly in light of the 2nd issue below.

The 2nd issue concerns using an ID to retrieve descriptions of
things.  In general, I don't think it's a good idea to require that
all "ivoaid:" IDs have a registered, retrievable description
associated with it.  That is, you may want to refer to an image in a
collection with an "ivoaid:" ID (say, in an SIA query result) but not
bother to actually register it explicitly.  This may be because:

   *  you've got too many images and it would be too much work
   *  the image or its ID is not persistant
   *  the collection contents is changing all the time.

Instead, we would simply require that at least one of its enclosing
collections be registered.  To make it possible to learn about an ID,
whether it is explicitly registered or not, I propose that the
authority that issues the ID support a "Describe" service that works
as follows:

   1. suppose I have an image ID of the form, 
        ivoaid://ncsa.uiuc.edu/ADIL/95.DR.01.01
   2. I give this ID to the service.  If that ID is registered
        explicitly, its description is returned.
   3. If that ID is not registered, the service looks for its
        enclosing colletion, ivoaid://ncsa.uiuc.edu/ADIL.
   4. The hierarchy is ascended until a description is found.  At a 
        minimum, the top level, ivoaid://ncsa.uiuc.edu, must be
        registered. 

Thus, you can always learn something about an ID.

My questions on this issue are:
  o  Should we require that all "ivoaid:" IDs be explicitly
     registered, or can we get away with just requiring registration,
     at the least, of one of the enclosing collections?
  o  Is the "fall-back" Describe service a good idea?
  o  If so, it requires that / (or :, in the URN syntax) imply
     containment.  Is this a problem?
  o  Does the "fall-back" Describe functionality affect which URI form
     we choose?

Now a 3rd issue (if you're still with me) is regarding mirroring and data
relocation.  Arnold proposed a three-component ID of the form "L:P:D",
where L=resource location, P=project/service, and D=dataset (see 
http://www.ivoa.net/forum/registry/0060.htm).  "L:P:D" points to a
specific instance of a dataset at a specific location.  "P:D" can be
used as a location-independent ID for the dataset which is resolvable
to a location by querying a registry for "P".  

I would propose folding this idea in in the following way.  Suppose
SSDS hosts a collection with the ID, "ivoaid://sdss.jhu.edu/SDSS/catalogs".
And suppose STSci wants to mirror that collection.  It would re-use
the "SDSS/catalogs" part of the ID for its mirror (that's the "P"
part); it could register this as
"ivoaid://stsci.edu/mirrors/SDSS/catalogs".  Now suppose that I want
to access one of the items in this collection:
"SDSS/catalogs/extended" (that's the "P:D" part).  I would resolve
this to a list of locations using a "Match ID" service of a registry.
The registry would first look for all IDs that end in
"SDSS/catalogs/extended".   Since this is not registered, it won't
find anything, so it ascends the ID and looks for IDs ending in
"SDSS/catalogs".  This would return both occurances:
"ivoaid://sdss.jhu.edu/SDSS/catalogs" and
"ivoaid://stsci.edu/mirrors/SDSS/catalogs". 

Note: just because 2 IDs share some portion does not by itself
indicate that they are mirrors.  To determine this definitively, one
would have to look at the metadata for the two collections.  We can
imagine specific metadata for describing this.

Questions:
  o  Is this a good framework for handling mirrors/data relocation
  o  (Arnold:)  does this satisfy the requirements for
     location-independent names (as needed by the journals)? 

I look forward to feedback.  We'll also talk about this at this week's
NVO MWG.

thanks,
Ray


From - Thu Feb 20 12:23:58 2003
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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: URGENT: Registry workgroup kickoff meeting: Who can come? How?
Date: Thu, 20 Feb 2003 11:21:08 -0000
Organization: University of Leicester
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Please reply TODAY:

1. Can you physically come to a registry kick-off meeting on 19/20 March
in London?

2. Can you still come if the meeting is elsewhere in UK (Edinburgh,
Cambridge, etc)?

3. Would you prefer or be able to attend the meeting by AccessGrid node?
Where?

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

The LeSC has an AG node but will only accommodate up to 10 people. So if
we're to do this I'll have to restrict the number of attendees in
London. We may be able to use the NeSC AG node which would accommodate
more people but I've not checked. I need to know how many people and by
which method they wish to attend.

Thanks,
Tony. 

> -----Original Message-----
> From: Tony Linde [mailto:ael@star.le.ac.uk] 
> Sent: 17 February 2003 15:31
> To: 'Registry_Ivoa_List'
> Subject: Registry workgroup kickoff meeting
> 
> 
> There were mixed comments about holding a face-to-face 
> kickoff meeting but there seemed to be sufficient interest 
> and the benefits of setting the scope and workload of the 
> group in such a meeting were great enough that we've set the 
> meeting up. I do hope that at least a couple of the US 
> participants to this list can make it.
> 
> Many thanks to Elizabeth Auden for chasing up a suitable 
> venue in London. It will be held at the London e-Science Centre
> (http://www.lesc.ic.ac.uk/) on 19-20 March, starting around 
> midday on the 19th and finishing around 15:00 on the 20th. 
> (No, it cannot be moved
> - this was the only location and date we could get.)
> 
> To quote from the LeSC Ops Manager: 'the room we have booked 
> for you has seating for over 30, with a number of desks. 
> There is one projector screen and a large white board. There 
> is no video projector currently in the room, but we can 
> supply one, or you could bring one if you'd rather. All rooms 
> are equipped with wireless networking.'
> 
> I'll gather opinions about the structure of the meeting and 
> likely topics over the next few days but wanted to get this 
> message up asap to give people a chance to look at their 
> arrangements for then.
> 
> 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 - Thu Feb 20 13:08:58 2003
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Subject: Re: URGENT: Registry workgroup kickoff meeting: Who can come? How?
From: Keith Noddle <ktn@star.le.ac.uk>
To: ael@star.le.ac.uk
Cc: "'Registry_Ivoa_List'" <registry@ivoa.net>
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On Thu, 2003-02-20 at 11:21, Tony Linde wrote:
> Please reply TODAY:
> 
> 1. Can you physically come to a registry kick-off meeting on 19/20 March
> in London?
Yes.
> 
> 2. Can you still come if the meeting is elsewhere in UK (Edinburgh,
> Cambridge, etc)?
Yes.
> 
> 3. Would you prefer or be able to attend the meeting by AccessGrid node?
> Where?
No.

Keith.

> 
> ====================
> 
> The LeSC has an AG node but will only accommodate up to 10 people. So if
> we're to do this I'll have to restrict the number of attendees in
> London. We may be able to use the NeSC AG node which would accommodate
> more people but I've not checked. I need to know how many people and by
> which method they wish to attend.
> 
> Thanks,
> Tony. 
> 
> > -----Original Message-----
> > From: Tony Linde [mailto:ael@star.le.ac.uk] 
> > Sent: 17 February 2003 15:31
> > To: 'Registry_Ivoa_List'
> > Subject: Registry workgroup kickoff meeting
> > 
> > 
> > There were mixed comments about holding a face-to-face 
> > kickoff meeting but there seemed to be sufficient interest 
> > and the benefits of setting the scope and workload of the 
> > group in such a meeting were great enough that we've set the 
> > meeting up. I do hope that at least a couple of the US 
> > participants to this list can make it.
> > 
> > Many thanks to Elizabeth Auden for chasing up a suitable 
> > venue in London. It will be held at the London e-Science Centre
> > (http://www.lesc.ic.ac.uk/) on 19-20 March, starting around 
> > midday on the 19th and finishing around 15:00 on the 20th. 
> > (No, it cannot be moved
> > - this was the only location and date we could get.)
> > 
> > To quote from the LeSC Ops Manager: 'the room we have booked 
> > for you has seating for over 30, with a number of desks. 
> > There is one projector screen and a large white board. There 
> > is no video projector currently in the room, but we can 
> > supply one, or you could bring one if you'd rather. All rooms 
> > are equipped with wireless networking.'
> > 
> > I'll gather opinions about the structure of the meeting and 
> > likely topics over the next few days but wanted to get this 
> > message up asap to give people a chance to look at their 
> > arrangements for then.
> > 
> > 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
> > 
-- 
Keith Noddle			Phone:  +44 (0)116 223 1894
AstroGrid Technical Lead	Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy	Mobile: +44 (0)7721 926 461
University of Leicester		Email:  ktn@star.le.ac.uk
Leicester, UK   LE1 7RH		Web:    http://www.astrogrid.org



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Date: Thu, 20 Feb 2003 06:27:07 -0600 (CST)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: Tony Linde <ael@star.le.ac.uk>
cc: registry@ivoa.net
Subject: RE: towards an ID spec
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Hi Tony,

Thanks for the comments!

> First a question: why do we need to use a single string to identify
> registered services? How about:
> 
> <serviceID>
>   <authorityID>http://www.star.le.ac.uk/ledas/registry</authorityID>
>   <serviceKey>xmm/catalogABC/datasetXYZ</serviceKey>
> </serviceID>

Good question.  I guess it's an issue of ease of compatability with
other contexts.  As a single string, there are places where it could
be inserted where an XML fragment (i.e. a <serviceID> node) could not,
e.g. a VOTable cell, as a reference in an XML attribute, or in some
other standard format like an OAI record (which requires a URI).
These may not make a strong argument as there may be simple ways
around them (e.g. in the VOTable case, one could store it in two
columns pretty easily) and thus perhaps would not outweigh the
advantages of delimiting the two clearly as you've shown.

> I'm quite averse to having any 'meaning' attached to the serviceID such
> as the first part being the address of the registry (what if LEDAS
> change to http://ledas.star.le.ac.uk - what happens to all its
> registered services?) and the stuff after the '/' being some other type
> of structure. If we want to store such information, we should create
> other fields in the metadata for it. 

I agree with this aversion, and I know my proposal walks a fine line.  
There were a number of details I left out, but perhaps I might share a few 
principles the proposal is based on: 

  *  In general, applications do not discern anything about a service
     based directly on the character content of its ID.  Applications
     must go to the metadata for this.  Just like URIs used in the XML
     world, it only implies a small number of things you can do with
     it (like use it as a reference).

  *  The only thing that one can definitively learn from an ID is
     where one can go to retrieve the metadata for the service.  (I
     think this is consistant with your <serviceId>.)

  *  The network name refers to the authority that issued the ID.
     Anyone can be their own authority.

  *  I did't intend the authority part to be part of (or imply) a URL
     base to antual registry service.  Rather, it was just an
     identifier (like in the RDF sense); to resolve it to an actual
     registry service, you would have to go to an IVOA-wide registry.
     However, if it is a URL base in some form, then you cut out a
     level of indirection.

> I don't see that 'ivoaid:' adds anything. If we use a serviceID within
> the VO then it will have been registered. 

So what does it mean to be "registered", in your mind?  Does this mean
that if you give the serviceKey to the authority it will return a
description?  Does this imply that anything that has a serviceKey must
have a retrievable description?  Or, alternatively, does the
authorityID simply serve as a namespace qualification and nothing is
implied about access to a description.

The use case I'm exploring here is where a data provider may want to
refer to an object with an ID but not bother formally registering a
description of it (because it's transient or too much work or
whatever).  This ID may be used as a handle for retrieving the object
itself (as opposed to its metadata).  This ID can still be useful as a
pointer to metadata if it can be used to get information about the
collection it is a part of.  If this functionality is not useful, then
much of the motivation for "ivoaid:" goes way.

One possible way to deal with IDs without description in your
serviceID model might be (ignoring my choice of element name):

 <serviceID>
   <authorityID>http://www.star.le.ac.uk/ledas/registry</authorityID>
   <serviceKey>xmm/catalogABC/datasetXYZ</serviceKey>
   <recordKey>1244+29.0_v100s.fits<recordKey>
 </serviceID>

where the serviceKey points to a metadata description but recordKey does
not.  Nothing else is implied except that there is some logical
relationship between the recordKey and the serviceKey; only by going to
the metadata can you discern that relationship.  This is the extent of
what I was trying to accomplish.

> The same applies to the 'mirrors' discussion. If you want to say that
> one service mirrors another, then just say so:

Yes, my intention was to determine a mirroring relationship via the
metadata.  The use case I'm exploring here is one brought to us by
journals, who would like a location independent identifier for data
cited in an article.  They would like to be able to resolve the ID to
a location or locations, even if that location changes.  The recipe I
proposed they use is:
   1.  submit the collection ID to a registry to get matching global
       IDs.
   2.  Verify that you have the desired data via the metadata

Your <serviceID> could be used in the same way, where <serviceKey> is
the location independent part. 

cheers,
Ray

From - Thu Feb 20 14:31:22 2003
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Date: Thu, 20 Feb 2003 14:32:32 +0100
From: Marco Leoni <Marco.Leoni@eso.org>
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To: registry@ivoa.net
Subject: Re: URGENT: Registry workgroup kickoff meeting: Who can come? How?
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Hi Tony,

>1. Can you physically come to a registry kick-off meeting on 19/20 March
>in London?
>
Yes

>
>2. Can you still come if the meeting is elsewhere in UK (Edinburgh,
>Cambridge, etc)?
>
Yes

>
>3. Would you prefer or be able to attend the meeting by AccessGrid node?
>Where?
>
No

>
>====================
>
>The LeSC has an AG node but will only accommodate up to 10 people. So if
>we're to do this I'll have to restrict the number of attendees in
>London. We may be able to use the NeSC AG node which would accommodate
>more people but I've not checked. I need to know how many people and by
>which method they wish to attend.
>
>Thanks,
>Tony.
>


Cheers,
    Marco

From - Thu Feb 20 16:08:59 2003
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Date: Thu, 20 Feb 2003 09:04:13 -0600 (CST)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: Tony Linde <ael@star.le.ac.uk>
cc: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: Re: URGENT: Registry workgroup kickoff meeting: Who can come? How?
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> 1. Can you physically come to a registry kick-off meeting on 19/20 March
> in London?

No.

> 2. Can you still come if the meeting is elsewhere in UK (Edinburgh,
> Cambridge, etc)?

No.

> 3. Would you prefer or be able to attend the meeting by AccessGrid node?
> Where?

Yes.  (I could look into coordinating various sites in the US. which 
could include DC, California, and Illinois.)

It's a shame though about the size of the room there (same deal here).  
You wouldn't want to restrict the # of warm bodies.

thanks,
Ray

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From: Andrew Lawrence <al@roe.ac.uk>
To: "'Ray Plante'" <rplante@ncsa.uiuc.edu>, Tony Linde <ael@star.le.ac.uk>
Cc: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: RE: URGENT: Registry workgroup kickoff meeting: Who can come? How
	?
Date: Thu, 20 Feb 2003 15:11:44 -0000
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Andy's answers

>> 1. Can you physically come to a registry kick-off meeting on 
>19/20 March
>> in London?

No.

>> 2. Can you still come if the meeting is elsewhere in UK (Edinburgh,
>> Cambridge, etc)?

can attend part if in Edinburgh (short but important meetings both days)

>> 3. Would you prefer or be able to attend the meeting by 
>AccessGrid node?

I could attend part via AccessGrid. (same reason as above) 

From - Thu Feb 20 16:54:21 2003
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To: <ael@star.le.ac.uk>, "'Registry_Ivoa_List'" <registry@ivoa.net>
References: <006e01c2d8d2$2a4b1290$b524d28f@bunyip>
Subject: Re: URGENT: Registry workgroup kickoff meeting: Who can come? How?
Date: Thu, 20 Feb 2003 10:25:19 -0500
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> Please reply TODAY:
>
> 1. Can you physically come to a registry kick-off meeting on 19/20 March
> in London?
Probably not.
> 2. Can you still come if the meeting is elsewhere in UK (Edinburgh,
> Cambridge, etc)?
No, that wouldn't help.
> 3. Would you prefer or be able to attend the meeting by AccessGrid node?
> Where?
Not sure.  If Ray Plante knows how to set things up...

p.s.  I usually ignore e-mail marked URGENT, as it is almost banking scams
from Africa!

From - Thu Feb 20 18:38:59 2003
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Tony Linde wrote:
> Please reply TODAY:
> 
> 1. Can you physically come to a registry kick-off meeting on 19/20 March
> in London?
>
No

> 2. Can you still come if the meeting is elsewhere in UK (Edinburgh,
> Cambridge, etc)?
> 
No

> 3. Would you prefer or be able to attend the meeting by AccessGrid node?
>


I'd be interested though I'm not quite sure what this involves...
... Where?
> 
??


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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: RE: Query message format
Date: Sun, 23 Feb 2003 16:50:11 -0000
Organization: University of Leicester
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> I've just proposed to the AstroGrid group that we base the 
> format of messages containing queries (eg from client, portal 
> or workflow component to registry or dataset) on the W3C 
> XQuery standard:

Thinking about it, we _could_ use XQuery as the basis of *registry*
queries. We don't have any legacy VO registries and we will be defining
strict schema for the metadata of services listed within the registries.

Cheers,
Tony. 


> -----Original Message-----
> From: Tony Linde [mailto:ael@star.le.ac.uk] 
> Sent: 16 February 2003 12:16
> To: 'Registry_Ivoa_List'
> Subject: Query message format
> ...

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From: "Tony Linde" <ael@star.le.ac.uk>
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Cc: "'Oliver Jevons'" <omj@doc.ic.ac.uk>,
   "Elizabeth Auden" <eca@mssl.ucl.ac.uk>
Subject: RE: Registry workgroup kickoff meeting: Who can come? How?
Date: Fri, 21 Feb 2003 14:56:49 -0000
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Status:   

Okay, we have enough 'warm bodies' (to borrow Bob's phrase) to
participate in a kick-off meeting in London on 19-20th March but none
from the US, which is disappointing. What I propose, therefore, is the
following approach:

We start the meeting at 11:00 am in the larger room at LeSC that we've
already booked. First order of business will be to select those who will
be members of a core working group whose job will be to produce
documents for the larger community of this mailing list. 

The WG will consist of me (as interim chairperson) plus whoever there is
from AstroGrid, Euro-VO, US-VO and any of the other VO projects who wish
to get involved and can spare someone for serious amounts of work.
Probably no more than about 10 people.

Following this we will have lunch and then take presentations on issues
relating to the registry standards.

At 16:00 GMT, the main meeting will conclude. The members of the WG
nominated earlier will retire to the Access Grid room at LeSC where they
will have a (roughly) two hour meeting with those from the US-VO project
who can get to an Access Grid room near them. The agenda for this
meeting will be built around the need to specify the aims and
deliverables of the WG and a roadmap for delivery. If there is time, we
can debate some of the issues raised in the mailing list.

On the 20th, we'll continue the kick-off meeting (back in the larger
room) with a presentation on the WG meeting and discussion of any issues
raised. We'll follow with further presentations and/or discussions and
will close about 13:00.

How does this sound as an approach. Sorry if I sound dictatorial here
but trying to coordinate everyone's needs has brought out the Saddam in
me :)

Cheers,
Tony. 

> -----Original Message-----
> From: Tony Linde [mailto:ael@star.le.ac.uk] 
> Sent: 20 February 2003 11:21
> To: 'Registry_Ivoa_List'
> Subject: URGENT: Registry workgroup kickoff meeting: Who can 
> come? How?
> Importance: High
> 
> 
> Please reply TODAY:
> 
> 1. Can you physically come to a registry kick-off meeting on 
> 19/20 March in London?
> 
> 2. Can you still come if the meeting is elsewhere in UK 
> (Edinburgh, Cambridge, etc)?
> 
> 3. Would you prefer or be able to attend the meeting by 
> AccessGrid node? Where?
> 
> ====================
> 
> The LeSC has an AG node but will only accommodate up to 10 
> people. So if we're to do this I'll have to restrict the 
> number of attendees in London. We may be able to use the NeSC 
> AG node which would accommodate more people but I've not 
> checked. I need to know how many people and by which method 
> they wish to attend.
> 
> Thanks,
> Tony. 
> 
> > -----Original Message-----
> > From: Tony Linde [mailto:ael@star.le.ac.uk]
> > Sent: 17 February 2003 15:31
> > To: 'Registry_Ivoa_List'
> > Subject: Registry workgroup kickoff meeting
> > 
> > 
> > There were mixed comments about holding a face-to-face
> > kickoff meeting but there seemed to be sufficient interest 
> > and the benefits of setting the scope and workload of the 
> > group in such a meeting were great enough that we've set the 
> > meeting up. I do hope that at least a couple of the US 
> > participants to this list can make it.
> > 
> > Many thanks to Elizabeth Auden for chasing up a suitable
> > venue in London. It will be held at the London e-Science Centre
> > (http://www.lesc.ic.ac.uk/) on 19-20 March, starting around 
> > midday on the 19th and finishing around 15:00 on the 20th. 
> > (No, it cannot be moved
> > - this was the only location and date we could get.)
> > 
> > To quote from the LeSC Ops Manager: 'the room we have booked
> > for you has seating for over 30, with a number of desks. 
> > There is one projector screen and a large white board. There 
> > is no video projector currently in the room, but we can 
> > supply one, or you could bring one if you'd rather. All rooms 
> > are equipped with wireless networking.'
> > 
> > I'll gather opinions about the structure of the meeting and
> > likely topics over the next few days but wanted to get this 
> > message up asap to give people a chance to look at their 
> > arrangements for then.
> > 
> > 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 - Fri Feb 21 17:29:00 2003
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Date: Fri, 21 Feb 2003 10:28:43 -0600 (CST)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: registry@ivoa.net
Subject: RE: Registry workgroup kickoff meeting: Who can come? How?
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Hey Tony,

This sounds like a good plan.  I'm going to tap our AccessGrid resources 
in the US to see what we can get set up.

thanks for the leadership!
Ray



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Date: Fri, 21 Feb 2003 17:09:22 +0000 (GMT)
From: Elizabeth Auden <eca@mssl.ucl.ac.uk>
To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: Maps and accomodation
In-Reply-To: <012201c2d9b9$763272b0$b524d28f@bunyip>
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Hello,

For all the London participants of the IVOA registry kick-off meeting, the
meeting will take place as Tony said on Wednesday, March 19 and Thursday,
March 20.  The venue is LeSc at the Imperial College Dept. of Computing.

MAP

http://www.streetmap.co.uk/newmap.srf?x=526494&y=179422&z=2&sv=526250,179250&st=4&ar=Y&mapp=newmap.srf&searchp=newsearch.srf

ACCOMODATION

You have several choices for booking a hotel:

1. Imperial College Conference Link hotel booking
http://www.ic.ac.uk/conferences/hotel-directory.htm

2. Cheap to MidRange Accomodation in South Kensington
http://www.holidaycity.com/uk-southkensington

3. Budget Accomodation in Bayswater (north of Hyde Park, about 25 minutes
walk from Imperial College)
http://www.hotel-london.co.uk/browse.php?range=Budget

On this particular page, I would recommend the New Linden, Westminster,
Blakemore, and Byron hotels.


Please feel free to email me if you have any questions.  I will post a
campus map with the meeting room location in a few days.


Cheers,
Elizabeth


From - Fri Feb 21 22:14:01 2003
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Date: Fri, 21 Feb 2003 15:10:06 -0600 (CST)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: RE: Registry workgroup kickoff meeting: Who can come? How?
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Hi Tony,

Do you expect to have telecon support in the main meeting room?

cheers,
Ray

From - Sat Feb 22 00:14:01 2003
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From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: RE: Registry workgroup kickoff meeting: Who can come? How?
Date: Fri, 21 Feb 2003 22:57:29 -0000
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Hi Ray,

I guess we could do but I thought that it'd be a bit pointless in a
large presentation-based meeting. If we can set the scope and roadmap
for the WG during the AccessGrid session then we can follow up with
telecons and email threads which directly tackle points on the roadmap.

The main meeting will consist of presentations on techniques and
technologies relevant to the registry field. We'll make sure the
presentations are uploaded with details of any discussions to the wiki
so others can comment later.

What do you think?

Cheers,
Tony.

> -----Original Message-----
> From: Ray Plante [mailto:rplante@poplar.ncsa.uiuc.edu] 
> Sent: 21 February 2003 21:10
> To: 'Registry_Ivoa_List'
> Subject: RE: Registry workgroup kickoff meeting: Who can come? How?
> 
> 
> Hi Tony,
> 
> Do you expect to have telecon support in the main meeting room?
> 
> cheers,
> Ray
> 

From - Sun Feb 23 00:09:03 2003
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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: <registry@ivoa.net>
Subject: RE: towards an ID spec
Date: Sat, 22 Feb 2003 23:04:10 -0000
Organization: University of Leicester
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Hi Ray,

Back to the interesting stuff...

> compatability with other contexts.  As a single string, there 
> are places where it could be inserted where an XML fragment 
> (i.e. a <serviceID> node) could not, e.g. a VOTable cell, as 

If we state that the authorityID must be a URI and neither it nor
serviceKey can contain the characters '?' nor '&', then, to get a single
string, we could join the two parts with the string '?serviceKey=',
giving:
 
http://www.star.le.ac.uk/ledas/registry?serviceKey=xmm/catalogABC/datase
tXYZ

Which even Outlook thinks is a URL but we would have to educate people
is just a simple way of representing IDs.

And for the registry entry for another Registry, where the serviceKey is
null, it simply has the string,
'http://www.star.le.ac.uk/ledas/registry' as its ID.

>   *  In general, applications do not discern anything about a service
>      based directly on the character content of its ID.

Agreed.

>   *  The only thing that one can definitively learn from an ID is
>      where one can go to retrieve the metadata for the service.

But only in the sense that you look up the authorityID (with null
serviceKey) in the Registry to find the location for the registry
containing the metadata (unless the registry you're sitting in has
chosen to replicate *all* metadata that it has harvested from other
registries.

>   *  The network name refers to the authority that issued the ID.
>      Anyone can be their own authority.

But only if they create and maintain a VO standards compliant Registry
service, thus allowing other registries access to the metadata
associated with the unique serviceKeys that they've issued.

Only if a registry 'owns' an authorityID can it guarantee that the
serviceKey values that it assigns to registered services are unique.

>  <serviceID>
>    <authorityID>http://www.star.le.ac.uk/ledas/registry</authorityID>
>    <serviceKey>xmm/catalogABC/datasetXYZ</serviceKey>
>    <recordKey>1244+29.0_v100s.fits<recordKey>
>  </serviceID>
> 
> where the serviceKey points to a metadata description but 
> recordKey does not.  Nothing else is implied except that 

That sounds good. Continuing the 'single string' discussion above, we
could plug the recordKey value in with a '&recordKey=' separator,
giving:

 
http://www.star.le.ac.uk/ledas/registry?serviceKey=xmm/catalogABC/datase
tXYZ&recordKey=1244+29.0_v100s.fits

> via the metadata.  The use case I'm exploring here is one 
> brought to us by journals, who would like a location 
> independent identifier for data cited in an article.  They 

We could certainly use the same structure. Assuming some VO-wide
implementation of the AstroGrid MySpace idea, a community which
maintains a MySpace service would provide a 'directory' of items (files,
tables, images etc) which would work in a similar manner to a registry,
so those items could be identified in the same way, eg:

<itemID>
  <authorityID>http://www.star.le.ac.uk/ledas/myspace</authorityID>
  <itemKey>TonyLinde/papers/2003/0222-Eureka.xml</itemKey>
</itemID>

And, as before, all the authorityIDs and itemKeys are
location-independent namespace-like pointers to appropriate metadata
structures (which, internally, could skip one step of indirection by
using something like the above as real directory structures).

Cheers,
Tony. 

> -----Original Message-----
> From: Ray Plante [mailto:rplante@poplar.ncsa.uiuc.edu] 
> Sent: 20 February 2003 12:27
> To: Tony Linde
> Cc: registry@ivoa.net
> Subject: RE: towards an ID spec
> 
> 
> ...

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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: <registry@ivoa.net>
Subject: FW: towards an ID spec
Date: Sun, 23 Feb 2003 08:54:13 -0000
Organization: University of Leicester
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Forward of Will's reply - it only came to me...

-----Original Message-----
From: Wil O'Mullane [mailto:womullan@skysrv.pha.jhu.edu] 
Sent: 22 February 2003 23:42
To: Tony Linde
Subject: Re: towards an ID spec


Just two technical points on this issue
1. a string can conatin anything if it is in CDATA
2. If the key is split in multiple elements as Tony suggests dont think
this precludes putting it in a cell of the VOtable or anyplace else. A
shard of XML is after all only a string.

Personally I like the ID split up this also does not prevent one of the
tags in the ID being acomplete url string with all ? and &s included
i.e. best of both worlds, although this seems OTT.

From - Tue Feb 25 02:49:07 2003
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Date: Mon, 24 Feb 2003 14:53:40 -0600 (CST)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: Tony Linde <ael@star.le.ac.uk>
cc: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: RE: Registry workgroup kickoff meeting: Who can come? How?
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Hi Tony,

(It looks like we've had a few messages go past each other, so some this 
message may be 'out-of-date'.)

> I guess we could do but I thought that it'd be a bit pointless in a
> large presentation-based meeting. If we can set the scope and roadmap
> for the WG during the AccessGrid session then we can follow up with
> telecons and email threads which directly tackle points on the roadmap.
> 
> The main meeting will consist of presentations on techniques and
> technologies relevant to the registry field. We'll make sure the
> presentations are uploaded with details of any discussions to the wiki
> so others can comment later.
> 
> What do you think?

Yeah, I that may be the best we can do under the circumstances.  
(Thoughts from other US-VOers?)  Bob also mentioned interest in teleconing 
in.  If you can swing a telecon line, we'll do our best with it.  

Assuming that we can't call in or otherwise contribute to the main
meeting, I thought I might mention two techniques/technologies that we've
been working on in case someone is giving a survey type presentation and
might stick in a slide on each.

As you know, one of the topics is the Open Archive Initiative metadata
harvesting protocol.  Roy and I have posted quite a bit to the list about
it, and I posted an evaluation of it to the RequistryRequirements wiki.  
This doc, http://www.ivoa.net/internal/IVOA/RegistryRequirements/evaloai.html, 
is probably a good starting point for the unfamiliar; one can follow the 
references therein as necessary.

The other area we've been looking at is identifiers.  I've been reworking 
my framework proposal based on comments I've received thus far.  I hope to 
have a document ready on it and posted to the wiki this week.  

cheers,
Ray



From - Mon Feb 24 23:44:07 2003
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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Ray Plante'" <rplante@ncsa.uiuc.edu>
Cc: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: RE: Registry workgroup kickoff meeting: Who can come? How?
Date: Mon, 24 Feb 2003 22:39:29 -0000
Organization: University of Leicester
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Hi Ray,

> in.  If you can swing a telecon line, we'll do our best with it.  

We're looking into it.

> http://www.ivoa.net/internal/IVOA/RegistryRequirements/evaloai.html, 

I'll try to work something up. I've read the doc and will try to put
down some comments and questions later.

Cheers,
Tony. 

> -----Original Message-----
> From: Ray Plante [mailto:rplante@poplar.ncsa.uiuc.edu] 
> Sent: 24 February 2003 20:54
> To: Tony Linde
> Cc: 'Registry_Ivoa_List'
> Subject: RE: Registry workgroup kickoff meeting: Who can come? How?
> 
> 
> Hi Tony,
> 
> (It looks like we've had a few messages go past each other, 
> so some this 
> message may be 'out-of-date'.)
> 
> > I guess we could do but I thought that it'd be a bit pointless in a 
> > large presentation-based meeting. If we can set the scope 
> and roadmap 
> > for the WG during the AccessGrid session then we can follow up with 
> > telecons and email threads which directly tackle points on the 
> > roadmap.
> > 
> > The main meeting will consist of presentations on techniques and 
> > technologies relevant to the registry field. We'll make sure the 
> > presentations are uploaded with details of any discussions 
> to the wiki 
> > so others can comment later.
> > 
> > What do you think?
> 
> Yeah, I that may be the best we can do under the circumstances.  
> (Thoughts from other US-VOers?)  Bob also mentioned interest 
> in teleconing 
> in.  If you can swing a telecon line, we'll do our best with it.  
> 
> Assuming that we can't call in or otherwise contribute to the 
> main meeting, I thought I might mention two 
> techniques/technologies that we've been working on in case 
> someone is giving a survey type presentation and might stick 
> in a slide on each.
> 
> As you know, one of the topics is the Open Archive Initiative 
> metadata harvesting protocol.  Roy and I have posted quite a 
> bit to the list about it, and I posted an evaluation of it to 
> the RequistryRequirements wiki.  
> This doc, 
> http://www.ivoa.net/internal/IVOA/RegistryRequ> irements/evaloai.html,

> is probably a good starting point for the unfamiliar; one can 
> follow the 
> references therein as necessary.
> 
> The other area we've been looking at is identifiers.  I've 
> been reworking 
> my framework proposal based on comments I've received thus 
> far.  I hope to 
> have a document ready on it and posted to the wiki this week.  
> 
> cheers,
> Ray
> 
> 
> 

From - Tue Mar  4 13:09:23 2003
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To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Cc: "'Oliver Jevons'" <omj@doc.ic.ac.uk>,
   "'Elizabeth Auden'" <eca@mssl.ucl.ac.uk>
Subject: Kickoff meeting: Registration
Date: Tue, 4 Mar 2003 12:08:27 -0000
Organization: University of Leicester
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Hi,

I have created a registration page for everyone who will be attending
the Registry Kickoff meeting on 19-20 March at LeSC (whether in person
or via telecon):
  http://www.ivoa.net/twiki/bin/view/IVOA/WhosCommingToRegistry19032003
(apologies for the spelling - IVOA Twiki won't let me change the page
name)

The meeting timings are on the meeting page:
  http://www.ivoa.net/twiki/bin/view/IVOA/Registry19032003

Please get your name down as soon as possible (ediT the page and add
your name and details under the appropriate section - if you cannot
figure it out, email the details to me). 

I'll be booking tea/coffee at the end of this week so if you're not down
there, you'll be out hunting down Starbucks!

Those who are dialling into the telecon must contact Bob Hanisch for the
phone number and access code - we cannot put this in an open forum.

Many thanks,
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 Mar  5 17:42:31 2003
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Dear Tony, dear All,

While going through the provisional agenda I was thinking that if we could
start with the Scope of IVOA Registry Standards we would better understand/evaluate
the technologies [Registry options (presentations)].

May I suggest a swap (1)<->(3) ?

Just an idea ...

Thanks,

Alberto

--
Alberto.Micol@eso.org                         Tel: +49 89 32006365
HST Science Archive       ST-ECF              Fax: +49 89 32006480
ESA/RSSD/SN               c/o ESO             Karl Schwarzschild Str.2,
http://archive.eso.org/   No ads, thanks.     Garching bei Muenchen,
http://www.stecf.org/     HTML emails         D-85748 Germany



--------------5CF2628D7C3BC61DDC60B5BA
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<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
&nbsp;
<br>Dear Tony, dear All,
<p>While going through the provisional agenda I was thinking that if we
could
<br>start with the Scope of IVOA Registry Standards we would better understand/evaluate
<br>the technologies [Registry options (presentations)].
<p>May I suggest a swap (1)&lt;->(3) ?
<p>Just an idea ...
<p>Thanks,
<p>Alberto
<pre>--&nbsp;
Alberto.Micol@eso.org&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Tel: +49 89 32006365
HST Science Archive&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ST-ECF&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Fax: +49 89 32006480
ESA/RSSD/SN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; c/o ESO&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Karl Schwarzschild Str.2,
<A HREF="http://archive.eso.org/">http://archive.eso.org/</A>&nbsp;&nbsp; No ads, thanks.&nbsp;&nbsp;&nbsp;&nbsp; Garching bei Muenchen,
<A HREF="http://www.stecf.org/">http://www.stecf.org/</A>&nbsp;&nbsp;&nbsp;&nbsp; HTML emails&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D-85748 Germany</pre>
&nbsp;</html>

--------------5CF2628D7C3BC61DDC60B5BA--

From - Thu Mar  6 09:12:32 2003
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From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Cc: "'Oliver Jevons'" <omj@doc.ic.ac.uk>,
   "'Elizabeth Auden'" <eca@mssl.ucl.ac.uk>
Subject: RE: Kickoff meeting: Registration
Date: Thu, 6 Mar 2003 08:08:40 -0000
Organization: University of Leicester
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Not a lot of people registered so far: live or virtual? Please add your
name to the list (or email me) today so I can book refreshments.

Location of the page has changed to :
 http://www.ivoa.net/twiki/bin/view/IVOA/WhosComingToRegistry19032003

Cheers,
Tony. 

> -----Original Message-----
> From: Tony Linde [mailto:ael@star.le.ac.uk] 
> Sent: 04 March 2003 12:08
> To: 'Registry_Ivoa_List'
> Cc: 'Oliver Jevons'; 'Elizabeth Auden'
> Subject: Kickoff meeting: Registration
> 
> 
> Hi,
> 
> I have created a registration page for everyone who will be 
> attending the Registry Kickoff meeting on 19-20 March at LeSC 
> (whether in person or via telecon):
>   
> http://www.ivoa.net/twiki/bin/view/IVOA/WhosComingToRegistry19032003
> 
> The meeting timings are on the meeting page:
>   http://www.ivoa.net/twiki/bin/view/IVOA/Registry19032003
> 
> Please get your name down as soon as possible (ediT the page 
> and add your name and details under the appropriate section - 
> if you cannot figure it out, email the details to me). 
> 
> I'll be booking tea/coffee at the end of this week so if 
> you're not down there, you'll be out hunting down Starbucks!
> 
> Those who are dialling into the telecon must contact Bob 
> Hanisch for the phone number and access code - we cannot put 
> this in an open forum.
> 
> Many thanks,
> 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 - Fri Mar  7 10:31:31 2003
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From: Sebastien Derriere <derriere@newb6.u-strasbg.fr>
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  Hello all,

  Maybe some of you have not subscribed to the 
ucd@ivoa.net list, but might have interest in
reading the paper I posted there:

http://www.ivoa.net/forum/ucd/0001.htm

  Sorry for those who received this info twice.

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 - Fri Mar  7 15:24:59 2003
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Date: Fri, 7 Mar 2003 09:25:19 -0500
From: "Wil O'Mullane" <womullan@skysrv.pha.jhu.edu>
To: registry@ivoa.net
Subject: RE: UCDs - repost
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Status:   

I note in your paper you mention not being able to express functions in an Ontology.
Many years ago I worked with Ontoloigua and KIF(Knowledge Interchange Format)
this indeed allows one to express functions on numbers .
http://logic.stanford.edu/kif/kif.html

Of course KIF is lisp (Lots of Incomprehensilble Silly Brackets indeed) based and not very pretty .

Still I see KSL have now extended Ontalingua in to the web world and suggest provideing it as a Server... it may bear looking at.

Perhaps this has already been explored ..

wil
> 
>   Hello all,
> 
>   Maybe some of you have not subscribed to the 
> ucd@ivoa.net list, but might have interest in
> reading the paper I posted there:
> 
> http://www.ivoa.net/forum/ucd/0001.htm
> 
>   Sorry for those who received this info twice.
> 
> 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


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I'm pleased to say that we will have a guest speaker at the Registry
Kickoff meeting to tell us about OAI and Dublin Core. The speaker is
Andy Powell, Assistant Director and Team Leader, Distributed Systems and
Services at UKOLN, University of Bath (http://www.ukoln.ac.uk/).

Andy's reponse to an email I sent to the OAI list states: 'I was a
member of the OAI technical committee that developed the OAI v2
specification.  I have done a number of presentations on OAI.  I set the
interoperability standards for the RDN (which uses the OAI protocol
internally) and the JISC Information Environment technical architecture,
which specifies use of OAI for metadata harvesting.  I also work on the
ePrints UK project, which will use the OAI protocol to develop a series
of subject-focused eprint discovery services.'

I'm sure we'll find this presentation useful and interesting. I'm
talking to Andy tomorrow lunchtime about the pitch of his presentation -
does anyone have any topics they especially want covered?

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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From: Alberto Micol <Alberto.Micol@eso.org>
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Dear Tony,

I was planning a presentation of a use case
coming from the astrovirtel experience.

See you soon,

Alberto

--
Alberto.Micol@eso.org                         Tel: +49 89 32006365
HST Science Archive       ST-ECF              Fax: +49 89 32006480
ESA/RSSD/SN               c/o ESO             Karl Schwarzschild Str.2,
http://archive.eso.org/   No ads, thanks.     Garching bei Muenchen,
http://www.stecf.org/     HTML emails         D-85748 Germany



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<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
&nbsp;
<br>Dear Tony,
<p>I was planning a presentation of a use case
<br>coming from the astrovirtel experience.
<p>See you soon,
<p>Alberto
<pre>--&nbsp;
Alberto.Micol@eso.org&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Tel: +49 89 32006365
HST Science Archive&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ST-ECF&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Fax: +49 89 32006480
ESA/RSSD/SN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; c/o ESO&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Karl Schwarzschild Str.2,
<A HREF="http://archive.eso.org/">http://archive.eso.org/</A>&nbsp;&nbsp; No ads, thanks.&nbsp;&nbsp;&nbsp;&nbsp; Garching bei Muenchen,
<A HREF="http://www.stecf.org/">http://www.stecf.org/</A>&nbsp;&nbsp;&nbsp;&nbsp; HTML emails&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D-85748 Germany</pre>
&nbsp;</html>

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From: Andre Schaaff <schaaff@newb6.u-strasbg.fr>
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Dear Tony,

I would present the GLU and the last works around it.

Regards,

Andr=E9



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From - Mon Mar 17 13:47:48 2003
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From: Marco Leoni <Marco.Leoni@eso.org>
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Hi Tony,

    I have few slides about Jini (if anyone is interested in).

Cheers,
    Marco


Tony Linde wrote:

>Can I have a role call of who will be presenting at the meeting on
>Wed/Thu this week. 
>
>We have Andy Powell with a presentation on OAI/DC.
>Elizabeth Auden/Keith Noddle will demo/present on AstroGrid registry
>work.
>
>Who else is there?
>
>Thanks,
>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
>
>  
>




_________________________________________________________________
Marco C. Leoni                        mleoni@eso.org
Astrophysical Virtual Observatory     http://www.euro-vo.org
ESO - KarlSchwarzschild Strasse, 2    phone:  +49 (0)89 3200 6560
D-85748 Garching bei München          fax:    +49 (0)89 3200 6480




From - Mon Mar 17 14:07:47 2003
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From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: RE: Who's presenting
Date: Mon, 17 Mar 2003 13:01:07 -0000
Organization: University of Leicester
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Yes, please, Marco. Thanks. I'll try to get an agenda out later today -
I'm in a meeting most of today.

Cheers,
Tony. 

> -----Original Message-----
> From: Marco Leoni [mailto:Marco.Leoni@eso.org] 
> Sent: 17 March 2003 12:45
> To: ael@star.le.ac.uk
> Cc: 'Registry_Ivoa_List'
> Subject: Re: Who's presenting
> 
> 
> Hi Tony,
> 
>     I have few slides about Jini (if anyone is interested in).
> 
> Cheers,
>     Marco
> 
> 
> Tony Linde wrote:
> 
> >Can I have a role call of who will be presenting at the meeting on 
> >Wed/Thu this week.
> >
> >We have Andy Powell with a presentation on OAI/DC.
> >Elizabeth Auden/Keith Noddle will demo/present on AstroGrid registry 
> >work.
> >
> >Who else is there?
> >
> >Thanks,
> >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
> >
> >  
> >
> 
> 
> 
> 
> _________________________________________________________________
> Marco C. Leoni                        mleoni@eso.org
> Astrophysical Virtual Observatory     http://www.euro-vo.org
> ESO - KarlSchwarzschild Strasse, 2    phone:  +49 (0)89 3200 6560
> D-85748 Garching bei München          fax:    +49 (0)89 3200 6480
> 
> 
> 
> 


From - Mon Mar 17 10:57:48 2003
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From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: Who's presenting
Date: Mon, 17 Mar 2003 09:49:46 -0000
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Status:   

Can I have a role call of who will be presenting at the meeting on
Wed/Thu this week. 

We have Andy Powell with a presentation on OAI/DC.
Elizabeth Auden/Keith Noddle will demo/present on AstroGrid registry
work.

Who else is there?

Thanks,
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 Mar 17 18:40:33 2003
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To: <ael@star.le.ac.uk>, "'Registry_Ivoa_List'" <registry@ivoa.net>
References: <000401c2ec6a$8e583870$b524d28f@bunyip>
Subject: Re: Who's presenting
Date: Mon, 17 Mar 2003 09:17:37 -0500
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Hi Tony et al.  It does not look like it is going to work out on the U.S.
end to get into an Access Grid node.  So, even though it may be non-ideal, I
think we will just stick with the telecon format.  It would be helpful if
people doing presentations could post their PPT files or whatever on the
twiki, and then those of us calling in could download them and follow along.

Cheers,
Bob

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This message is in MIME format.

---MOQ10479364844eb4ecb2474e12e48a9fa68bef4d3027
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Hello everybody,

I send you the most recent paper about the GLU and the work around it.


Andr=E9
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JVBERi0xLjMKJeLjz9MKMSAwIG9iago8PAovTGVuZ3RoIDU3NTAKL0ZpbHRlciBbL0ZsYXRlRGVj
b2RlXQo+PgpzdHJlYW0KWIXNWUuT5DZyvvevqJU02ipJRREACZJ2b9ndmu6Db47o244vY+8cHGFF
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---MOQ10479364844eb4ecb2474e12e48a9fa68bef4d3027--

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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Cc: "Andy Powell" <a.powell@ukoln.ac.uk>
Subject: RE: Who's presenting
Date: Tue, 18 Mar 2003 10:12:05 -0000
Organization: University of Leicester
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Status:   

Based on responses to this call for presenters, I'll propose the
following as an agenda:
  http://www.ivoa.net/twiki/bin/view/IVOA/Registry19032003

The first day will consist of a mixture of discussions and
presentations. 

The first discussion will be about the scope of the work: what standards
should we be working on, how they should be presented and how the group
organises itself.

The second discussion covers requirements: what are the basic 'givens'
of the IVOA registry, what functional and technical things must be
there. (We don't want to try to get all requirements covered - that'll
be one of the tasks of the group overall.)

The final discussion of the day is about work packages. I've proposed
that the work of this group be split into 4-6 work packages with 2-3
people working on each WP. If this is acceptable, this discussion will
be about what WPs are required.

The second day will follow on from the WP discussion and will consist of
all discussions. We will spend time discussing each WP: what the scope
of their work should be, who will be in the WP group, outline
plans/roadmap.

Finally we will end with plans for the May meeting (15-16th) - what
documents will be presented to that meeting, whether we need pre-meeting
meetings (12-14th), etc.

How does that sound?

Cheers,
Tony. 

> -----Original Message-----
> From: Tony Linde [mailto:ael@star.le.ac.uk] 
> Sent: 17 March 2003 09:50
> To: 'Registry_Ivoa_List'
> Subject: Who's presenting
> 
> 
> Can I have a role call of who will be presenting at the 
> meeting on Wed/Thu this week. 
> 
> We have Andy Powell with a presentation on OAI/DC.
> Elizabeth Auden/Keith Noddle will demo/present on AstroGrid 
> registry work.
> 
> Who else is there?
> 
> Thanks,
> 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, 18 Mar 2003 11:30:15 +0100
From: Andre Schaaff <schaaff@newb6.u-strasbg.fr>
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Subject: Re: Who's presenting
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Tony Linde wrote:

>
> How does that sound?
>

Sounds good for me.

Andr=E9

>
> Cheers,
> Tony.

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Hi Tony,
    sounds good for me, too.

See you tomorrow,
    Marco


Tony Linde wrote:

>Based on responses to this call for presenters, I'll propose the
>following as an agenda:
>  http://www.ivoa.net/twiki/bin/view/IVOA/Registry19032003
>
>The first day will consist of a mixture of discussions and
>presentations. 
>
>The first discussion will be about the scope of the work: what standards
>should we be working on, how they should be presented and how the group
>organises itself.
>
>The second discussion covers requirements: what are the basic 'givens'
>of the IVOA registry, what functional and technical things must be
>there. (We don't want to try to get all requirements covered - that'll
>be one of the tasks of the group overall.)
>
>The final discussion of the day is about work packages. I've proposed
>that the work of this group be split into 4-6 work packages with 2-3
>people working on each WP. If this is acceptable, this discussion will
>be about what WPs are required.
>
>The second day will follow on from the WP discussion and will consist of
>all discussions. We will spend time discussing each WP: what the scope
>of their work should be, who will be in the WP group, outline
>plans/roadmap.
>
>Finally we will end with plans for the May meeting (15-16th) - what
>documents will be presented to that meeting, whether we need pre-meeting
>meetings (12-14th), etc.
>
>How does that sound?
>
>Cheers,
>Tony. 
>
>  
>
>>-----Original Message-----
>>From: Tony Linde [mailto:ael@star.le.ac.uk] 
>>Sent: 17 March 2003 09:50
>>To: 'Registry_Ivoa_List'
>>Subject: Who's presenting
>>
>>
>>Can I have a role call of who will be presenting at the 
>>meeting on Wed/Thu this week. 
>>
>>We have Andy Powell with a presentation on OAI/DC.
>>Elizabeth Auden/Keith Noddle will demo/present on AstroGrid 
>>registry work.
>>
>>Who else is there?
>>
>>Thanks,
>>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
>>    
>>

--------------030705090802050406080500
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
  <meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1">
  <title></title>
</head>
<body>
Hi Tony,<br>
&nbsp;&nbsp;&nbsp; sounds good for me, too.<br>
<br>
See you tomorrow,<br>
&nbsp;&nbsp;&nbsp; Marco<br>
<br>
<br>
Tony Linde wrote:<br>
<blockquote type="cite" cite="mid005201c2ed36$d370b0f0$b524d28f@bunyip">
  <pre wrap="">Based on responses to this call for presenters, I'll propose the
following as an agenda:
  <a class="moz-txt-link-freetext" href="http://www.ivoa.net/twiki/bin/view/IVOA/Registry19032003">http://www.ivoa.net/twiki/bin/view/IVOA/Registry19032003</a>

The first day will consist of a mixture of discussions and
presentations. 

The first discussion will be about the scope of the work: what standards
should we be working on, how they should be presented and how the group
organises itself.

The second discussion covers requirements: what are the basic 'givens'
of the IVOA registry, what functional and technical things must be
there. (We don't want to try to get all requirements covered - that'll
be one of the tasks of the group overall.)

The final discussion of the day is about work packages. I've proposed
that the work of this group be split into 4-6 work packages with 2-3
people working on each WP. If this is acceptable, this discussion will
be about what WPs are required.

The second day will follow on from the WP discussion and will consist of
all discussions. We will spend time discussing each WP: what the scope
of their work should be, who will be in the WP group, outline
plans/roadmap.

Finally we will end with plans for the May meeting (15-16th) - what
documents will be presented to that meeting, whether we need pre-meeting
meetings (12-14th), etc.

How does that sound?

Cheers,
Tony. 

  </pre>
  <blockquote type="cite">
    <pre wrap="">-----Original Message-----
From: Tony Linde [<a class="moz-txt-link-freetext" href="mailto:ael@star.le.ac.uk">mailto:ael@star.le.ac.uk</a>] 
Sent: 17 March 2003 09:50
To: 'Registry_Ivoa_List'
Subject: Who's presenting


Can I have a role call of who will be presenting at the 
meeting on Wed/Thu this week. 

We have Andy Powell with a presentation on OAI/DC.
Elizabeth Auden/Keith Noddle will demo/present on AstroGrid 
registry work.

Who else is there?

Thanks,
Tony. 

__
Tony Linde                       Phone:  +44 (0)116 223 1292
AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
Dept of Physics &amp; Astronomy      Mobile: +44 (0)7753 603356
University of Leicester          Email:  <a class="moz-txt-link-abbreviated" href="mailto:ael@star.le.ac.uk">ael@star.le.ac.uk</a>
Leicester, UK   LE1 7RH          Web:    <a class="moz-txt-link-freetext" href="http://www.astrogrid.org">http://www.astrogrid.org</a><!---->
    </pre>
  </blockquote>
</blockquote>
<pre class="moz-signature" cols="$mailwrapcol"></pre>
</body>
</html>

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To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Cc: "Andy Powell" <a.powell@ukoln.ac.uk>
Subject: RE: Who's presenting
Date: Tue, 18 Mar 2003 11:20:56 -0000
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Quick update: Anita proposed a presentation on metadata requirements
which I've slotted in before the 'Must have' requirements discussion:
  http://www.ivoa.net/twiki/bin/view/IVOA/Registry19032003

Cheers,
Tony. 

> -----Original Message-----
> From: Tony Linde [mailto:ael@star.le.ac.uk] 
> Sent: 18 March 2003 10:12
> To: 'Registry_Ivoa_List'
> Cc: Andy Powell
> Subject: RE: Who's presenting
> 
> 
> Based on responses to this call for presenters, I'll propose 
> the following as an agenda:
>   http://www.ivoa.net/twiki/bin/view/IVOA/Registry19032003
> 
> The first day will consist of a mixture of discussions and 
> presentations. 
> 
> The first discussion will be about the scope of the work: 
> what standards should we be working on, how they should be 
> presented and how the group organises itself.
> 
> The second discussion covers requirements: what are the basic 
> 'givens' of the IVOA registry, what functional and technical 
> things must be there. (We don't want to try to get all 
> requirements covered - that'll be one of the tasks of the 
> group overall.)
> 
> The final discussion of the day is about work packages. I've 
> proposed that the work of this group be split into 4-6 work 
> packages with 2-3 people working on each WP. If this is 
> acceptable, this discussion will be about what WPs are required.
> 
> The second day will follow on from the WP discussion and will 
> consist of all discussions. We will spend time discussing 
> each WP: what the scope of their work should be, who will be 
> in the WP group, outline plans/roadmap.
> 
> Finally we will end with plans for the May meeting (15-16th) 
> - what documents will be presented to that meeting, whether 
> we need pre-meeting meetings (12-14th), etc.
> 
> How does that sound?
> 
> Cheers,
> Tony. 
> 
> > -----Original Message-----
> > From: Tony Linde [mailto:ael@star.le.ac.uk]
> > Sent: 17 March 2003 09:50
> > To: 'Registry_Ivoa_List'
> > Subject: Who's presenting
> > 
> > 
> > Can I have a role call of who will be presenting at the
> > meeting on Wed/Thu this week. 
> > 
> > We have Andy Powell with a presentation on OAI/DC.
> > Elizabeth Auden/Keith Noddle will demo/present on AstroGrid
> > registry work.
> > 
> > Who else is there?
> > 
> > Thanks,
> > 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 Mar 19 17:40:39 2003
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Date: Wed, 19 Mar 2003 10:36:36 -0600 (CST)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: registry@ivoa.net
Subject: update to resource schema
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  This message is in MIME format.  The first part should be readable text,
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This message follows on a discussion within the NVO MWG about XML-ing our 
Resource metadata.

---------- Forwarded message ----------
Date: Tue, 18 Mar 2003 17:10:37 -0600 (CST)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: metadata@us-vo.org
Subject: update to resource schema

Hi,

Attached is another crack at the Resource XML schema, now called
VOResource.xsd.  In addition, I've attached an example xml file and a
couple of XMLSpy renderings of parts of the schema.  Don't sweat the
details.  I mainly want to illustrate how we can handle some of the issues
we discussed 3 weeks ago.

In particular:
  *  The root node, VODescription, is simply a container for holding 
     one or more resource descriptions.

  *  The "VODescription" image shows the top level of the schema.
     Essentially what this is meant to show is that "Organization", 
     "Project", and "Service" are all specific kinds of the 
     generic Resources.  The "Service" image shows that it extends
     the generic Resource content (in yellow) and by adding add an 
     "Interface" element.

  *  Several of the elements, "Curation", "Coverage", and "Interface", 
     support an attribute called "defaultsTo".  This allows the document 
     to refer to another resource that it can share metadata with.  Use of 
     this can be seen in the attached "adil.xml": each resource inherits 
     the Curation data from the previous resource; only those items that 
     are different are overriden.  

  *  The last service shown in adil.xml shows how specialized metadata, 
     defined elsewhere, is incorporated to describe a specific 
     class of standard service.  (This is mainly illustrative as it still 
     needs work--suggestions welcome.)

  *  The identifiers are just illustrative.  These would need to conform 
     to the standard for VO IDs.

The schema still needs tweaking.  For example, spatial coverage should use
Arnold's schema.  Some of the Curation content will probably get pulled
out (e.g. ServiceURL).

Comments so far?

cheers,
Ray



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---1903330751-741011261-1048026046=:16375--

From - Thu Mar 20 20:55:41 2003
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Date: Thu, 20 Mar 2003 14:53:50 -0500
From: "Wil O'Mullane" <womullan@skysrv.pha.jhu.edu>
To: registry@us-vo.org, interop@ivoa.net, ws@ivoa.net, metadata@us-vo.op
Subject: WebServices/ DIME in Java 
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As you may know there are several web services availabel at JHU - we have started to try to list them here
http://skyservice.pha.jhu.edu/develop/vo/

We have also developed a DIME service to return SDSS images and a java clinet which consumes this service. The java client was running on linux showing interoperability of DIME attachments (the server is a .NET service on a windows machine). The client was developed using AXIS (which is free).

Here is a link to the code  and some information for anyone who would like to try it.
http://skyservice.pha.jhu.edu/develop/vo/imgcutoutclient.html

Of course feel free to mail me directly for further information/discussion.

Also appologies for the cross post.

wil

From - Mon Mar 24 11:05:43 2003
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From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: Kickoff meeting
Date: Mon, 24 Mar 2003 09:58:04 -0000
Organization: University of Leicester
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Thanks to everyone who attended the Registry WG kickoff meeting last
week, especially the Europeans who travelled to London and the Americans
who were up at ungodly hours to participate by (an initially flaky but
eventually, thanks to NASA, very effective) telecon.

I'll post a summary of the meeting on the meeting page:
  http://www.ivoa.net/twiki/bin/view/IVOA/Registry19032003
(which already has all the presentations and some supporting documents)
shortly, but will mention a few conclusions here.

We have set up five working packages to encompass the work required for
producing the range of standards within the registry domain. Those are:

Rwp01: Management, Policy & Documentation standards
Rwp02: Requirements, Science Cases, Use Cases, Test Cases
Rwp03: Metadata specs
Rwp04: Registry replication and interfaces
Rwp05: Implementation coordination

A number of the people at the meeting 'volunteered' to lead and
participate in those groups. Those people were (first named is lead):

Rwp01: Tony		Bob, Marco
Rwp02: Mark		Alberto, Anita, Nic, Ray, Tom, David Schade,
Elizabeth
Rwp03: Ray		Sebastien, Bob, Clive Davenhall, Clive Page,
Elizabeth
Rwp04: Keith	Andre, Will, Gretchen, Ray, Marco
Rwp05: (tbd)	Keith, Roy, Markus, Pierre, Andre

We *will* be looking for further volunteers for these groups from those
who were unable to participate in the meeting. Please contact the wp
leads to sign up.

All discussions within each wp will be conducted on this mailing list so
that everyone can participate, even if not signed up to work on a
particular item. Can I remind everyone to prefix the subject of any wp
email with the code for the wp, eg:
  Subject: Rwp01-Suggestions for doc stds

We defined some initial milestones for each group. In essence they
commit each group to early draft documents by the Interop meeting at
Cambridge on 15-16 May. These milestones are defined in the slides I
kept changing on the second day:
 
http://www.ivoa.net//internal/IVOA/Registry19032003/TL-IVOARegistry-Day2
.ppt

The wp participants may choose to amend these milestones after their
initial discussions. Two milestones, however, apply to *every* wp:

Define Scope: 11-April
Set plans: 11-April

So by the 11-April, each wp will have published a document containing
the scope of their work and plans for how they intend to get all
documents within that scope up to V1.0 by the end of this year.

We have a lot of work to do, especially over the next few weeks but,
based on the enthusiasm and commitment shown during the kickoff meeting,
I'm sure we'll achieve our goals.

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 Mar 24 17:30:20 2003
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Date: Mon, 24 Mar 2003 17:29:35 +0100
From: Markus Dolensky <Markus.Dolensky@eso.org>
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Hi Tony & Bob,

since I haven't been at the meeting in London, but noticed that the 
technical leads are supposed to take care of
- "Rwp05: Implementation coordination"
let me chip in two questions:

1. Are these doc standards intended for use by all IVO working groups?
(I would hope so.)

2. Did we define how to distinguish between science cases, use cases, 
and test cases?
Are there relationships in that there should be >=1 use case per science 
case and >=1 test case per use case?

Cheers,
Markus

+---
| Markus Dolensky   Mailto:Markus.Dolensky@eso.org
| AVO Technical Lead          Web: www.euro-vo.org
| Voice: ++49 89 32006/261  Fax: ++49 89 32006/480
+---


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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: RE: Rwp01/Rwp05-Suggestions for doc stds
Date: Mon, 24 Mar 2003 19:44:19 -0000
Organization: University of Leicester
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Hi Markus,

> 1. Are these doc standards intended for use by all IVO 
> working groups? (I would hope so.)

The original idea was for the standard to apply to the documents created
by the Registry WG but I was alaso going to submit the recommendations
to the exec for approval as a general set of standards. Indeed, if we
adapt the W3C, GGF or similar standard, there's no reason why this
should not be the case.

> 2. Did we define how to distinguish between science cases, use cases, 
> and test cases?

The people involved in Rwp02 will define this as part of the scope
document. Certainly there would never be any enforced 1:1 relationship.

Cheers,
Tony. 

> -----Original Message-----
> From: Markus Dolensky [mailto:Markus.Dolensky@eso.org] 
> Sent: 24 March 2003 16:30
> To: 'Registry_Ivoa_List'
> Subject: Re: Rwp01/Rwp05-Suggestions for doc stds
> 
> 
> Hi Tony & Bob,
> 
> since I haven't been at the meeting in London, but noticed that the 
> technical leads are supposed to take care of
> - "Rwp05: Implementation coordination"
> let me chip in two questions:
> 
> 1. Are these doc standards intended for use by all IVO 
> working groups? (I would hope so.)
> 
> 2. Did we define how to distinguish between science cases, use cases, 
> and test cases?
> Are there relationships in that there should be >=1 use case 
> per science 
> case and >=1 test case per use case?
> 
> Cheers,
> Markus
> 
> +---
> | Markus Dolensky   Mailto:Markus.Dolensky@eso.org
> | AVO Technical Lead          Web: www.euro-vo.org
> | Voice: ++49 89 32006/261  Fax: ++49 89 32006/480
> +---
> 
> 

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From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: Rwp01-Document format
Date: Mon, 24 Mar 2003 10:55:12 -0000
Organization: University of Leicester
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I'd like to suggest that we standardise on XHTML as the format for all
standards documents. It would be nice to use a derivative of DocBook's
xml schema but I don't think we have time to develop that and get people
used to editing it - everyone probably has some sort of HTML editor.

Along with the layout standards, we'll create a css file to ensure all
the docs look the same.

What do you think?

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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From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: Rwp01-Suggestions for doc stds
Date: Mon, 24 Mar 2003 10:50:42 -0000
Organization: University of Leicester
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I was planning to adapt the document standards used by the W3C for our
use but cannot find a reference to them anywhere on the site. I'll
create some based on the actual documents but was wondering if anyone
had links to other standards bodies which published documents similar to
the ones we'll be producing and which did have doc stds available.

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 - Tue Mar 25 23:35:44 2003
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Date: Tue, 25 Mar 2003 17:30:55 -0500 (EST)
From: Kirk Borne <borne@rings.gsfc.nasa.gov>
Reply-To: Kirk Borne <borne@rings.gsfc.nasa.gov>
Subject: Re: UCDs status and perspectives
To: ucd@ivoa.net, registry@ivoa.net
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Status:   

Ray:  I believe that your suggestions carry a lot of merit.  I had a
nagging feeling when reading Jonathan's comments that our metadata
efforts could easily diverge (as you suggest) if we are not careful.
The data model is key to this -- consequently, the ability of XML
Schema to carry the knowledge about both the data model and the
metadata relationships, using standardized techniques, makes a lot
of sense -- especially with regard to reconciling the two metadata
approaches that you mention.  I think that disaster can be averted,
and Jonathan's and your suggestions can illuminate the way.  The
PHOT_FLUX(PHOT_BAND_ID) is an excellent example of the problem
and a good solution.

- Kirk


> Date: Tue, 25 Mar 2003 15:15:13 -0600 (CST)
> From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
> To: ucd@ivoa.net
> Subject: Re: UCDs status and perspectives
> 
> We have been bouncing around in our community two models for tagging
> metadata that we will eventually need to reconcile.  One is essentially
> XML-based and the other is based on the current UCD set.  The former makes
> the most sense for descriptions stored in a registry, while the latter is
> useful for tagging a set of data (e.g. in a table column).  Both are
> important and necessary.  Both reflect a common data model.  However, it
> would inconvenient if not disasterous if there were not a direct
> correlation between to two representations.
> 
> I feel the answer can be found in existing XML technologies.  I would 
> claim that the atomic descriptors being discussed (PAD, PCD, etc.) are 
> really just a short hop from an XML model.  The main thing that PCD has 
> in common with XML tags is that both are essentially pointers into a 
> data model.  The main difference between them is that with a UCD/PCD, we 
> need that pointer to be representable as a simple string (e.g. that can be 
> put in the ucd attribute in a VOTable).  
> 
> XML has such a pointer; it's called an XPath.  If we define the data 
> model as an XML Schema, then our UCD/PCDs fall right out.  There are other 
> advantages:
>   *  XML Schema provides a machine readable form for a data dictionary.
>   *  The extensibility of XML schemas provides the extensibility for 
>      UCDs automatically.  
>   *  When necessary, metadata in direct XML form (as envisioned in a 
>      registry) into UCD-tagged VOTable data.  
>   *  The modeling that Jonathan proposed is largely still applicable.
>   *  The approach is consistant with the data modeling activities that 
>      have been done to date.
> 
> As an example, consider the example Jonathan cited:
> 
> > For instance the two UCDs PHOT_FLUX_RADIO_1.4G
> > and PHOT_FLUX_RADIO_1.6G would map to a single PCD
> > PHOT_FLUX(PHOT_BAND_ID) with PHOT_BAND_ID taking the values 1.4 GHz and
> > 1.6 GHz. 
> 
> Suppose a data model defined more or less in the following way:
> 
>  <element name="PHOT">     
>    <complexType>           
>      <sequence>            
>        <element name="FLUX" type="fluxValue"/>  <!-- fluxValue and freqValue 
-->
>        <element name="FREQ" type="freqValue/>   <!--   defined elsewhere     
-->
>      </sequence>           
>    </complexType>          
>  </element>                
> 
> In direct XML, such a flux would be rendered as:
> 
>  <PHOT>
>    <FREQ>1.6 GHz</FREQ>
>    <FLUX>0.25 GHz</VALUE>
>  </PHOT>
> 
> The XPath pointing to the flux value would be:
> 
>   PHOT[FREQ='1.6 GHz']/FLUX
> 
> Note that there doesn't need to a direct XML representation like the
> one shown above for the XPath to carry meaning; it points into a data
> model describing Photometry.  
> 
> To make this model work, I think we need to...
>   * set some restrictions on how metadata are defined in XML Schema.
>     We may consider avoiding the defining attributes; this would make
>     XPaths simpler and it would integrate into SOAP more easily.
> 
>   * devise a consistant pattern representing measurements (i.e. value
>     and unit).  I'm *not* recommending the form in the above example.
> 
>   * build data models from the bottom up starting with common concepts
>     (e.g. physical quantities) that can be reused in different
>     contexts.  (Jonathan's model is relevent here.)  A freqency
>     should be represented the same way whether it is describing a flux
>     measurement or a bandwidth.  
> 
> cheers,
> Ray


+------------------------------------+-------------------------------------+
| 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

From - Tue Mar 25 23:05:44 2003
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Date: Tue, 25 Mar 2003 16:04:25 -0600 (CST)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: registry@ivoa.net
Subject: UCDs and XML
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Please pardon if you've already seen this post to the ucd list.  

---------- Forwarded message ----------
Date: Tue, 25 Mar 2003 15:15:13 -0600 (CST)
From: Ray Plante <rplante@ncsa.uiuc.edu>
To: ucd@ivoa.net
Subject: Re: UCDs status and perspectives

We have been bouncing around in our community two models for tagging
metadata that we will eventually need to reconcile.  One is essentially
XML-based and the other is based on the current UCD set.  The former makes
the most sense for descriptions stored in a registry, while the latter is
useful for tagging a set of data (e.g. in a table column).  Both are
important and necessary.  Both reflect a common data model.  However, it
would inconvenient if not disasterous if there were not a direct
correlation between to two representations.

I feel the answer can be found in existing XML technologies.  I would 
claim that the atomic descriptors being discussed (PAD, PCD, etc.) are 
really just a short hop from an XML model.  The main thing that PCD has 
in common with XML tags is that both are essentially pointers into a 
data model.  The main difference between them is that with a UCD/PCD, we 
need that pointer to be representable as a simple string (e.g. that can be 
put in the ucd attribute in a VOTable).  

XML has such a pointer; it's called an XPath.  If we define the data 
model as an XML Schema, then our UCD/PCDs fall right out.  There are other 
advantages:
  *  XML Schema provides a machine readable form for a data dictionary.
  *  The extensibility of XML schemas provides the extensibility for 
     UCDs automatically.  
  *  When necessary, metadata in direct XML form (as envisioned in a 
     registry) into UCD-tagged VOTable data.  
  *  The modeling that Jonathan proposed is largely still applicable.
  *  The approach is consistant with the data modeling activities that 
     have been done to date.

As an example, consider the example Jonathan cited:

> For instance the two UCDs PHOT_FLUX_RADIO_1.4G
> and PHOT_FLUX_RADIO_1.6G would map to a single PCD
> PHOT_FLUX(PHOT_BAND_ID) with PHOT_BAND_ID taking the values 1.4 GHz and
> 1.6 GHz. 

Suppose a data model defined more or less in the following way:

 <element name="PHOT">     
   <complexType>           
     <sequence>            
       <element name="FLUX" type="fluxValue"/>  <!-- fluxValue and freqValue -->
       <element name="FREQ" type="freqValue/>   <!--   defined elsewhere     -->
     </sequence>           
   </complexType>          
 </element>                

In direct XML, such a flux would be rendered as:

 <PHOT>
   <FREQ>1.6 GHz</FREQ>
   <FLUX>0.25 GHz</VALUE>
 </PHOT>

The XPath pointing to the flux value would be:

  PHOT[FREQ='1.6 GHz']/FLUX

Note that there doesn't need to a direct XML representation like the
one shown above for the XPath to carry meaning; it points into a data
model describing Photometry.  

To make this model work, I think we need to...
  * set some restrictions on how metadata are defined in XML Schema.
    We may consider avoiding the defining attributes; this would make
    XPaths simpler and it would integrate into SOAP more easily.

  * devise a consistant pattern representing measurements (i.e. value
    and unit).  I'm *not* recommending the form in the above example.

  * build data models from the bottom up starting with common concepts
    (e.g. physical quantities) that can be reused in different
    contexts.  (Jonathan's model is relevent here.)  A freqency
    should be represented the same way whether it is describing a flux
    measurement or a bandwidth.  

cheers,
Ray

From - Wed Mar 26 02:35:44 2003
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Date: Wed, 26 Mar 2003 09:34:38 +0800
From: Cui Chenzhou <ccz@bao.ac.cn>
Organization: National Astronomical Observatory
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Dear all,

I think two problems should be addressed in the VO Registry:

1. Expert knowledge registry

Given an question, for example, "Find all galaxies with a deVaucouleours
profile and the photometric colors consistent with an elliptical galaxy"
 (taken from Question 5, Alexander S. Szalay 2000, Designing and Mining
Multi-Terabyte Astronomy Archives:The Sloan Digital Sky Survey),
application service needs know "what is a galaxy", "what is a
deVaucouleours profile", "what is an elliptical galaxy". Should, how and
where these expert knowledge be registered?

2. International language support

Can VO permit users to submit queries in Chinese or Russian? How these
queries are transformed and executed taking advantage of VO Registry?

All kinds of comments and suggestions are welcome.

Cheers,


-- 
============================================================
Chenzhou Cui  (Ph.D. Candidate, LAMOST project)
National Astronomical Observatory | Tel: (8610)64877703-1320
Chinese Academy of Sciences       | FAX: (8610)64878240
Datun Road 20A, Chaoyang District | Email: ccz@bao.ac.cn
Beijing 100012, China             | WWW: www.lamost.org/~cb
============================================================

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Date: Wed, 26 Mar 2003 12:16:30 +0100
From: "Mark G.Allen" <allen@newb6.u-strasbg.fr>
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Subject: Rwp02 - Initiate discussion
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Hi everyone,

This email is to initiate discussion on the Registries
Work Package 02 (Rwp02) "Requirements, Science Cases, Use Cases
and Test Cases", following the IVOA Registries Kickoff meeting
in London, March 19-20.

The charter of this work package as defined in that meeting is
to focus on science case scenarios, and use cases related specifically
to VO registries. In particular, to develop use cases which will help
define requirements for VO registries.

The overall plan for all work packages is to get v1.0 documents
in shape by the end of the year, but since this work package defines
the science drivers, and requirements that other work packages will
rely on, we'll need to have good draft versions very soon.

We're probably in good shape with work along these lines already
started by various groups, and hopefully those involved can contribute
in the context of IVOA. This work package will require a wide range
of input, so volunteers are GREATLY ENCOURAGED! Sign up as suggested
by Tony, by emailing me, or simply wade into the discussion.

The first-cut of a plan for Rwp02 from the meeting comprises a list
of the envisaged documents, and dates for early drafts:

- Define Scope       draft v0.1     11 April
- Key Science Cases  draft v0.1     11 April
- Use Cases          draft v0.1     25 April
- Requirements       draft v0.1     09 May

(Cambridge Meeting                 May 12-16)

- Requirements       drafts v0.2    28 June
  Science Cases
  Use Cases
  Test cases

Clarification of these terms should go into the scope document, but
this is how they were understood at the meeting.

Key Science Cases - 5 or 6 science scenarios relying on registry functions

Use cases - How registries are envisaged to be used,
            i.e. Requests (from humans, a VO portal or other VO layered
                 services) for *** from a registry which responds with ***.
                 The various type of requests, e.g. locating services
                 via wavelength, locating processing service etc.

Test cases - actual queries against which registry implementations can
             be tested. Ranging from simple to complex.


The Cambridge meeting in May will be an ideal time to have face to
face discussions on these issues, and to also have presentations of
key science and use cases. Registries will mean different things to
different people, so the intention is to have those ideas developed
to a level where they can be compared in detail in Cambridge.

The first drafts for the Scope definition and Key Science cases are
due in only a couple of weeks. I hope the discussion will be able
to quickly define the scope, and that text on key science cases
can be contributed by the various originators. I intend to get a
wiki page for drafts set up on the IVOA pages.

There is much discussion on various aspects of registries
already on this mailing list. Those entering at this discussion
are encouraged to read the previous threads.

Also, to see how this work package fits into the overall IVOA Registry
plans, see the information about the meeting on
http://www.ivoa.net/twiki/bin/view/IVOA/Registry19032003. Tony should
post a meeting summary/minutes there soon.


 - Mark


From - Wed Mar 26 13:50:44 2003
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Date: Wed, 26 Mar 2003 07:45:54 -0500 (EST)
From: Kirk Borne <borne@rings.gsfc.nasa.gov>
Reply-To: Kirk Borne <borne@rings.gsfc.nasa.gov>
Subject: Re: Rwp02-Suggestions for Registry Requirements
To: registry@ivoa.net, ccz@bao.ac.cn
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Hello Chenzhou.  Those are very good questions.

Regarding the international language support, I will defer
to my more experienced colleagues working in that area,
though I believe that each nation's V.O. project should
devote some attention to their specific needs in such
translations of queries and results.  I think that something
like a set of language-sensitive UCDs might help.

Regarding your question about an "expert knowledge registry",
again I think that UCDs can help.  In your particular example,
what is important is that the registry knows that "galaxy"
is a class of objects, that "deVaucouleours profile" is
a derived parameter (in this case, a derived parameter from
a set of derived parameters = the light profile), and that
"elliptical galaxy" is one particular subclass from a more
general class of objects.  The registry should be able
to report (back to the user's client or to some VO client)
that "Yes/No, this site has (or does not have) information 
about objects, or about classications of objects, or
about derived parameters from objects, or we have the
analysis tools and data to derive those parameters, ..."

I don't expect that our astronomical information service
registries will include every possible term and concept
in astronomy, but the VO-query (VOQL) should be able
to parse such requests and identify the type of request
(request for data, metadata, analysis service), and then
use that to poll the registries for positive responses.

- 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


> Date: Wed, 26 Mar 2003 09:34:38 +0800
> From: Cui Chenzhou <ccz@bao.ac.cn>
> To: registry@ivoa.net
> Subject: Rwp02-Suggestions for Registry Requirements
> 
> Dear all,
> 
> I think two problems should be addressed in the VO Registry:
> 
> 1. Expert knowledge registry
> 
> Given an question, for example, "Find all galaxies with a deVaucouleours
> profile and the photometric colors consistent with an elliptical galaxy"
>  (taken from Question 5, Alexander S. Szalay 2000, Designing and Mining
> Multi-Terabyte Astronomy Archives:The Sloan Digital Sky Survey),
> application service needs know "what is a galaxy", "what is a
> deVaucouleours profile", "what is an elliptical galaxy". Should, how and
> where these expert knowledge be registered?
> 
> 2. International language support
> 
> Can VO permit users to submit queries in Chinese or Russian? How these
> queries are transformed and executed taking advantage of VO Registry?
> 
> All kinds of comments and suggestions are welcome.
> 
> Cheers,
> 
> 
> -- 
> ============================================================
> Chenzhou Cui  (Ph.D. Candidate, LAMOST project)
> National Astronomical Observatory | Tel: (8610)64877703-1320
> Chinese Academy of Sciences       | FAX: (8610)64878240
> Datun Road 20A, Chaoyang District | Email: ccz@bao.ac.cn
> Beijing 100012, China             | WWW: www.lamost.org/~cb
> ============================================================

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From: "Wil O'Mullane" <womullan@skysrv.pha.jhu.edu>
To: Cui Chenzhou <ccz@bao.ac.cn>
Cc: registry@ivoa.net
Subject: Re: Rwp02-Suggestions for Registry Requirements
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> 2. International language support
> 
> Can VO permit users to submit queries in Chinese or Russian? How these
> queries are transformed and executed taking advantage of VO Registry?
> 
Having some knowledge in this area allow me to comment.
At the simplest level this appears fine you pass a Language= or l= param on all requests. Ideally all servers would then hold this in a session variable so subsequent requests in the session know their language (plus all links returned need to carry the parameter with them). 
The iso codes for langauges are the obvious choice for the values of this parameter.
If a server does not support a language it returns its default.

Now inside the servers however we need tables which have translations for all words which may be translated this may be all UCDs what about units and all other words. The server then needs to substitute the translations based on the code passed in the request. In this case it is better of the server works in terms of ID numbers rather than actual words and returns the defeult (english?) when the apropriate translation is not available. 
This is to say you have to write your servers in a very different manner when it is truly multilingual.

In short this is a major undertaking if it is to be a "requiremrnt" of IVO then it should be considered from the very outset . 
having implemented a single dynamic site in multiple languages I worry it will suck in a lot of resources to do a distributed multilingual set of VO services.

Of course an alternative would be the babel fish aporch of provideing tranlation services which we pass our reults through.
 

wil

From - Wed Mar 26 17:00:45 2003
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From: "Roy Williams" <roy@cacr.caltech.edu>
To: "Ray Plante" <rplante@ncsa.uiuc.edu>, <registry@ivoa.net>
References: <Pine.LNX.4.44.0303251603110.7434-100000@poplar.ncsa.uiuc.edu>
Subject: Re: UCDs and XML
Date: Wed, 26 Mar 2003 07:58:13 -0800
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Ray

You are suggesting an alternative representation of UCD for these complex
situations, doing the same semantically as Johnathan's "parametrized" UCD,
but represented in XML. Certainly from the point of view of extensibility,
the XML would seem preferable, and the connection to Xschema and Xpath is
elegant. In VOTable, we could allow UCD as an attribute of FIELD, but then
allow an alternative definition as a full XML element.

My thinking on UCD is going around the idea of "recognition".

In writing code for VO applications, I am looking for specific UCDs. Reading
the result of a cone search means finding the POS_EQ_RA_MAIN. Reading the
result of a SIAP means looking for the UCD called VOX:Image_AccessReference.

Therefore it should be allowed to have multiple UCDs describing the same
attribute, so that different applications can recognize and use it. One
person sees a galaxy, another sees a database record, another sees
clip-art -- but it's all the same entity underneath.

This recognition idea allows us to use UCD to subclass objects. If I have a
table from a cone search, then it must have UCDs corresponding to RA, Dec,
ID. Let us subclass this, for example, to a service that returns black-hole
candidates. In this case, we would expect further UCDs to be present:
BH_mass and BH_Spin.

There is a lot that can be done with UCD, and the real question is how to
allow this semantic flexibility to blossom, but without having everyone make
their own UCD and losing all interoperability!

Roy

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

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From: "Wil O'Mullane" <womullan@skysrv.pha.jhu.edu>
To: Cui Chenzhou <ccz@bao.ac.cn>
Cc: registry@ivoa.net
Subject: Re: Rwp02-Suggestions for Registry Requirements
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> > 2. International language support
> > 
> > Can VO permit users to submit queries in Chinese or Russian? How these
> > queries are transformed and executed taking advantage of VO Registry?
> > 

Another important thing I forgot 
If we do multilingual then ucds or anyhting that may appear in chinese needs to be elements - it is very diffcult to specify attributs in XML which are high order UTF-8 - this may be fixed but current parsers at least last year ) had trouble with this.

wil

From - Wed Mar 26 19:00:45 2003
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From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
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To: Roy Williams <roy@cacr.caltech.edu>
cc: registry@ivoa.net
Subject: Re: UCDs and XML
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Hi Roy,

I think I missed an important point of your message regarding the
relationship between UCDs and XML.  Are you commenting on whether an
XPath-based UCD can be used in the ways we are currently using UCDs.  I
believe they can, and I don't see any barrier to doing any of the things
you described.  Simply put, instead of using a UCD like "BH_mass", we
would say "BlackHole/mass" (which still fits nicely in a ucd= attribute).  
I think I missed something, though, so please set me straight.

> There is a lot that can be done with UCD, and the real question is how to
> allow this semantic flexibility to blossom, but without having everyone make
> their own UCD and losing all interoperability!

The attraction of an XML-based data model (from which UCDs can flow) is 
that it provides a framework around which we can build interoperable, 
standard metadata.  As a community (through the IVOA), we can adopt 
standard schemas; the standard is represented by a highly structured
document (a schema).  The XML mechanism of namespaces and intermixing of 
schemas allow one to straight forwardly define and use new schemas to 
cover new concepts (e.g. black holes).  If you want wide interoperability 
for those new concepts, it requires adoption by the whole community. 

cheers,
Ray


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Some of the first things for discussion in Rwp02 as I see them are
 i) the rough plan as outlines in the Initiate Discussion post.
ii) Scope definition,   and
iii) Key Science cases.

Here I've jotted down some ideas on Scope Definition and how we might
start on the Key Science cases, again flowing on from the London meeting
discussion, and intended to motivate discussion here.

Some Ideas for Scope Definition:

In order to keep focused, the science- and  use-cases are
intended to be directly related to registry functions in
the VO, rather than the VO as a whole. Or, at least the
registry relevant aspects of general VO science cases should
be foremost.

In considering registry functions, we should not get hung up
on technical or implementation issues. For example we might
simply refer to things like the "query format" without
specifying what this format is, rather focusing on what
resource and scientific information needs to be included.

Similarly we probably don't want to get bogged down
specifying how a portal or interface may utiltise
information returned from a registry, but at the
same time not get too far removed from reality.

As part of the scope definition, it was also suggested
we try to decide on some definitions for the sake of
putting names to things like "resources", "query service" etc.
I'd suggest general adoption of the language and definitions
in "Resource and Service Metadata for the VO"
(http://www.ivoa.net/internal/IVOA/Registry19032003/ResourceServiceMetadataV6.pdf)
(although this may contradict Tony's meeting notes(?))

Issues of depth, complexity and granularity are bound to be
central here, but we should keep in mind the general question
as put by AL "what is the MINIMUM set of agreed standards we
should agree on".


Key Science cases:

5 or 6 key science case envisaged to drive definition of
what needs to go into a registry. Let's start on one front
by taking the current science cases developed by the various groups,
and seeing what requirements these place on registries.
(NVO has of course defined some "registry use case scenarios"
already)


-Mark.


----------------------------------------------
Mark G. Allen
Observatoire de Strasbourg
11 Rue de l'Universite
Strasbourg 67000
FRANCE

email: allen@astro.u-strasbg.fr
phone: +33 3 90 24 24 87
fax:   +33 3 90 24 24 17
----------------------------------------------



From - Thu Mar 27 16:27:23 2003
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From: Andreas Wicenec <awicenec@eso.org>
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Subject: interesting new initiative
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Dear all,

the following is an interesting new initiative which has pretty similar goals 
than what we are talking about:

http://www.xfront.com/dist-reg/distributed-registry.html

Cheers,
Andreas

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Yap, I agree: the best thing to do is to adopt the definitions given in

http://www.ivoa.net/internal/IVOA/Registry19032003/ResourceServiceMetadataV6.pdf

I quite like the definitions of "service", "resource", and "query service";
instead, the "non-query service: concept should be clarified, actually I would prefer
dropping it completely, because any service, even a service that sends emails or deletes files:

 -  it is queried (in the sense of invoked)
 -  it must produce a response since it has to notify whether the
    operation succeeded or not, or if it the request has been queued, etc.

In this sense, I think there should be no non-query services.

The only exception regarding the non-Bob's document terminology might be the definition of the registry itself.  For two reasons:

1) The feeling is that such definition is too generic, and anyway it is the role of this
working group to revisit it and redefine it.

2) There is one contraddiction with what was agreed at the kickoff meeting:
The definition of a "registry" speaks of services and not of resources.
I like it better this way though (a resource is in my view too broad and non-functional concept to be useful, unless by resource we mean another registry), but if we go for this terminology, then we have to rivisit the decision taken at the meeting.

btw, is this what you meant by saying that this is contraddicting Tony's minutes ?

Alberto



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From: Elizabeth Auden <eca@mssl.ucl.ac.uk>
To: "'Registry_Ivoa_List'" <registry@ivoa.net>
Subject: RWP03: standard for documentation of astronomical catalogues
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Hi all,

I came across an interesting page on the CDS website that may pertain to
the Metadata workpackage.  A lot of the astronomers may have already seen
this, but computer types like me may not:

"Standard for Documentation of Astronomical Catalogues"
http://vizier.u-strasbg.fr/doc/catstd.htx

"This document details the standards adopted for the documentation of
astronomical catalogues in its version Version 2.0, dated February 2000. A
short overview of the conventions, with some tips on how to fill the
ReadMe file, is also available."

cheers,
Elizabeth


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Hi Alberto,

Yes, I agree that Rwp02 can elaborate on the definition of a registry
from a scientific point of view.

In terms of defining Key Science cases and use cases, I wonder if you
could comment further on the AstroVirtel experience.  Your March 19/20
Registry meeting does this for one science case, but perhaps you could
describe how the "registry-like-requirements" of AstroVirtel science
cases in general compare to the registry use cases and requirements
drafted by NVO

 * Requirements: see
   http://www.ivoa.net/twiki/bin/view/IVOA/RegistryRequirements

 * Use Cases:  see    
http://www.ivoa.net/twiki/bin/view/IVOA/RegistryUseCases .


thanks,
Mark.



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I've started a Rwp02 twiki web page at

http://www.ivoa.net/twiki/bin/view/IVOA/IVOARegWp02

-Mark.



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Roy -

> >  Galactic coordinates are pretty important and adding support
> > for these to POS is a reasonable thing to consider.
>
> The more complicated is the specification of conesearch/SIA, the smaller the
> number of implementations! It is the NVO that should build the middleware --
> so that users get a rich set of services, but the entrance cost for
> publishers is low low low.
>
> One way to do the galactic coordinates is to specify SIA in terms of a
> single coordinate system (as it is now), and have a middleware service to
> make the coordinate conversion, which in turn calls the elementary service.

This is dead wrong.   Coordinate syntax parsing, coordinate transforms,
and polygonal constraints (which includes the "cone search" as a single-
constraint subset) are all straightforward and should be an integral part
of any server-side search engine (image or catalog).  NVO should be
promulgating knowlege on how to do this (and portable code snippets,
where appropriate), not characterizing it as a complex issue that needs
third-party middleware.



> > The broader question
> > is do we want to generalize the query region specification,
>
> Similarly, we could have an elementary service specification that uses only
> disks or rectangles, and have middleware to deal with complex regions
> through multiple calls to the elementary service.
>
> Just as programmers in the 1960's learned to combine subroutines as
> components, so the Holy Grail of Web Services is to combine services as
> components. (Your comments welcome).

I admit to a bias here.  I have yet to see a need for anything more complicated
that a convex polygon on the sky as a region definition (i.e. no annuli or other

regions with holes).  With that constraint, I maintain that the following are
all
equivalent (in that a single location-filtering library can handle them all):

   o  Convex polygon in any coordinate system.  This is just
       a set of planes cutting the sphere.  Usually great circle
       planes but just as easily small circles (e.g. latitude lines)

   o  Point-radius "cone" searches (since this is just a single plane)

   o  Box on the sky (if you assume great circles connecting the
       the corners of the box, this is both a four sided polygon
       as above (you just parameterize it differently) and is exactly
       the same as the coverage of a Gnomonic projection (TAN)
       image of the same size.

For many real-world images, connecting corners by great circles is close
enough for coverage checking, so I would maintain that a FITS header
(translated to a box) can also be used as a region definition.



> >  ASU for example specifies a more general syntax, .
>
> Let us ask a specific question then: is is possible to convert an arbitrary
> conesearch service to an ASU service through appropriate middleware?

No.  The cone search service has two major shortcomings and this
inability to deal with regions is one of them.  The other is the lack of
(optional) relational constraints.

Many sites have the ability to apply relational constraints within their
underlying DBMS engine.  For those that don't, a simple filter (preferably
based on SQL "where" clause syntax) applied to their initial output
records (either on the fly in their code or as a post-processing step)
would produce the same result.



> > > A key requirement for this to work is that the service provider be able
> > > to communicate to the client which query elements it can accept. This
> > > will be part of the metadata service request (FORMAT=METADATA).
>
> There is a very general type of conversation that I think we should include
> as part of our service specification. Once we can implement this in a
> general way, it covers a lot of ground.
>
> Waiter: What type of toast?
> Customer: What do you have?
> Waiter: White, wheat, rye, ....
> Customer: Wheat
>
> Note that lines 2 and 3 can be omitted if the customer already knows the
> list of options.

Agreed, and this is exactly the way one should handle the relational
constraint issue above.

- John


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Dear Mark,

After various real-world interruptions, I managed to get some virtual time
and composed a first draft version of an astrovirtel-driven use case for the Registry.
There is no comparison with the NVO requirements for the registry in there. I may
work on that aspects if you like.

Please find attached both a PDF and a DOC version.
It's a very first draft: changes, comments, suggestions, english proof-reading, etc are
more than welcome.

The DOC might be a bit weird, since I wrote it with staroffice, let me know if there are
problems with it. (In any case, the final version will have to be encapsulated into the standard registry document template)

Alberto

--
Alberto.Micol@eso.org                         Tel: +49 89 32006365
HST Science Archive       ST-ECF              Fax: +49 89 32006480
ESA/RSSD/SN               c/o ESO             Karl Schwarzschild Str.2,
http://archive.eso.org/   No ads, thanks.     Garching bei Muenchen,
http://www.stecf.org/     HTML emails         D-85748 Germany



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<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
&nbsp;
<br>Dear Mark,
<p>After various real-world interruptions, I managed to get some virtual
time
<br>and composed a first draft version of an astrovirtel-driven use case
for the Registry.
<br>There is no comparison with the NVO requirements for the registry in
there. I may
<br>work on that aspects if you like.
<p>Please find attached both a PDF and a DOC version.
<br>It's a very first draft: changes, comments, suggestions, english proof-reading,
etc are
<br>more than welcome.
<p>The DOC might be a bit weird, since I wrote it with staroffice, let
me know if there are
<br>problems with it. (In any case, the final version will have to be encapsulated
into the standard registry document template)
<p>Alberto
<pre>--&nbsp;
Alberto.Micol@eso.org&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Tel: +49 89 32006365
HST Science Archive&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ST-ECF&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Fax: +49 89 32006480
ESA/RSSD/SN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; c/o ESO&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Karl Schwarzschild Str.2,
<A HREF="http://archive.eso.org/">http://archive.eso.org/</A>&nbsp;&nbsp; No ads, thanks.&nbsp;&nbsp;&nbsp;&nbsp; Garching bei Muenchen,
<A HREF="http://www.stecf.org/">http://www.stecf.org/</A>&nbsp;&nbsp;&nbsp;&nbsp; HTML emails&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D-85748 Germany</pre>
&nbsp;</html>

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From - Fri Apr 11 11:28:41 2003
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From: Pierre Fernique <fernique@simbad.u-strasbg.fr>
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Robert Hanisch wrote:
> One of the charges to Rwg1 concerns identifying policy matters relevant 
> to registries.  Tony, Marco, and I have assembled this list of issues.
>  
> Bob
>  
> 
> Registry Policy Issues
> 
> Draft, 10 April 2003
> 
> As we move forward in the development of Resource and Service Registries 
> for the Virtual Observatory, we can anticipate needing to deal with 
> several policy issues.
> 
> ·         Do we need to control or restrict in any way the ability of 
> groups or individuals to register resources and services?  Thus far we 
> have tried to be as open and inclusive as possible, though we then have 
> the risk of people registering poor quality or inappropriate services, 
> or of permitting some sort of malicious corruption to the registries.
> 
> ·         Should we develop some sort of VO endorsement for registered 
> resources and services, i.e., a “seal of approval”?  Such endorsements 
> could be managed by the various national projects, with a national 
> endorsement serving as an implicit IVOA endorsement for IVOA member 
> organizations.  What process should we use to review and grant such 
> endorsements?
> 
> ·         We will need to have some editorial control over the 
> registries, e.g., to remove inappropriate and inactive resources and 
> services, and to correct erroneous entries.  Who should have this 
> responsibility, and how is editorial access controlled?
> 
> ·         Should we, and if so, how do we, control the number and 
> quality of registry servers/ services themselves?  How do we assure that 
> multiple registry services are properly synchronized?  Do we care if 
> different registries focus on different types of resources and services, 
> or should all registries be 100% inclusive?
> 


I definitely agree with these points. The policy for a good quality of 
resource descriptions is certainly more important than the repository 
technical solution itself.
Also, our experience with GLU shows us that the resource descriptions 
really used by some institutes for their own functional services are 
generally correctly maintained, other are forgotten and left "as is" in 
the repository. Even with an automatic synchronization system as the GLU 
has, we have this kind of problem, simply the synchronization mechanism 
is applied on out-of-date resource descriptions. And more, as each 
resource cannot be modified or removed by other people than its owner 
(GLU distributed authentification mechanism), we cannot clean ourself 
old resource descriptions without contacting the owner.

As you suggest we should have several synchronized repository centers in 
charge of maintaining a set of resources exactly in the same way that we 
can have moderators on mailing lists, or how Astroweb had been designed 
several years ago. But perhaps not systematically on the institutes 
level as the GLU does presently, but on a more global level (countries 
?) if institutes agree to "delegate" this task.


Regards,
Pierre Fernique






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From: "Robert Hanisch" <hanisch@stsci.edu>
To: <registry@ivoa.net>
Subject: policy issues
Date: Thu, 10 Apr 2003 15:29:30 -0400
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One of the charges to Rwg1 concerns identifying policy matters relevant =
to registries.  Tony, Marco, and I have assembled this list of issues.

Bob

Registry Policy Issues

Draft, 10 April 2003

=20

=20

As we move forward in the development of Resource and Service Registries =
for the Virtual Observatory, we can anticipate needing to deal with =
several policy issues.

=20

=B7         Do we need to control or restrict in any way the ability of =
groups or individuals to register resources and services?  Thus far we =
have tried to be as open and inclusive as possible, though we then have =
the risk of people registering poor quality or inappropriate services, =
or of permitting some sort of malicious corruption to the registries.

=B7         Should we develop some sort of VO endorsement for registered =
resources and services, i.e., a "seal of approval"?  Such endorsements =
could be managed by the various national projects, with a national =
endorsement serving as an implicit IVOA endorsement for IVOA member =
organizations.  What process should we use to review and grant such =
endorsements?

=B7         We will need to have some editorial control over the =
registries, e.g., to remove inappropriate and inactive resources and =
services, and to correct erroneous entries.  Who should have this =
responsibility, and how is editorial access controlled?

=B7         Should we, and if so, how do we, control the number and =
quality of registry servers/ services themselves?  How do we assure that =
multiple registry services are properly synchronized?  Do we care if =
different registries focus on different types of resources and services, =
or should all registries be 100% inclusive?

=20

We do not propose to define these policies in detail now, but should =
bear in mind the eventual need to implement certain controls as we =
design the VO Registry facilities
------=_NextPart_000_0021_01C2FF75.FAB41E80
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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>One of the charges to Rwg1 concerns =
identifying=20
policy matters relevant to registries.&nbsp; Tony, Marco, and I have =
assembled=20
this list of issues.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Bob</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV>
<DIV><FONT face=3DArial size=3D2>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt; TEXT-ALIGN: center"=20
align=3Dleft><FONT face=3D"Times New Roman" size=3D3>Registry Policy =
Issues</FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt; TEXT-ALIGN: center"=20
align=3Dleft><FONT face=3D"Times New Roman" size=3D3>Draft, 10 April =
2003</FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt" align=3Dleft><FONT =
size=3D3><FONT=20
face=3D"Times New Roman">&nbsp;<?xml:namespace prefix =3D o ns =3D=20
"urn:schemas-microsoft-com:office:office" =
/><o:p></o:p></FONT></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><FONT size=3D3><FONT=20
face=3D"Times New Roman">&nbsp;<o:p></o:p></FONT></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><FONT face=3D"Times =
New Roman"=20
size=3D3>As we move forward in the development of Resource and Service =
Registries=20
for the Virtual Observatory, we can anticipate needing to deal with =
several=20
policy issues.</FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><FONT size=3D3><FONT=20
face=3D"Times New Roman">&nbsp;<o:p></o:p></FONT></FONT></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt 0.25in; TEXT-INDENT: -0.25in; mso-list: l0 =
level1 lfo1; tab-stops: list .25in"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Symbol; mso-bidi-font-size: =
12.0pt">=B7<SPAN=20
style=3D"FONT: 7pt 'Times New =
Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
</SPAN></SPAN><FONT face=3D"Times New Roman" size=3D3>Do we need to =
control or=20
restrict in any way the ability of groups or individuals to register =
resources=20
and services?<SPAN style=3D"mso-spacerun: yes">&nbsp; </SPAN>Thus far we =
have=20
tried to be as open and inclusive as possible, though we then have the =
risk of=20
people registering poor quality or inappropriate services, or of =
permitting some=20
sort of malicious corruption to the registries.</FONT></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt 0.25in; TEXT-INDENT: -0.25in; mso-list: l0 =
level1 lfo1; tab-stops: list .25in"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Symbol; mso-bidi-font-size: =
12.0pt">=B7<SPAN=20
style=3D"FONT: 7pt 'Times New =
Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
</SPAN></SPAN><FONT face=3D"Times New Roman" size=3D3>Should we develop =
some sort of=20
VO endorsement for registered resources and services, i.e., a =93seal of =

approval=94?<SPAN style=3D"mso-spacerun: yes">&nbsp; </SPAN>Such =
endorsements could=20
be managed by the various national projects, with a national endorsement =
serving=20
as an implicit IVOA endorsement for IVOA member organizations.<SPAN=20
style=3D"mso-spacerun: yes">&nbsp; </SPAN>What process should we use to =
review and=20
grant such endorsements?</FONT></P>
<P class=3DMsoNormal=20
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12.0pt">=B7<SPAN=20
style=3D"FONT: 7pt 'Times New =
Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
</SPAN></SPAN><FONT face=3D"Times New Roman" size=3D3>We will need to =
have some=20
editorial control over the registries, e.g., to remove inappropriate and =

inactive resources and services, and to correct erroneous entries.<SPAN=20
style=3D"mso-spacerun: yes">&nbsp; </SPAN>Who should have this =
responsibility, and=20
how is editorial access controlled?</FONT></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt 0.25in; TEXT-INDENT: -0.25in; mso-list: l0 =
level1 lfo1; tab-stops: list .25in"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Symbol; mso-bidi-font-size: =
12.0pt">=B7<SPAN=20
style=3D"FONT: 7pt 'Times New =
Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
</SPAN></SPAN><FONT face=3D"Times New Roman" size=3D3>Should we, and if =
so, how do=20
we, control the number and quality of registry servers/ services=20
themselves?<SPAN style=3D"mso-spacerun: yes">&nbsp; </SPAN>How do we =
assure that=20
multiple registry services are properly synchronized?<SPAN=20
style=3D"mso-spacerun: yes">&nbsp; </SPAN>Do we care if different =
registries focus=20
on different types of resources and services, or should all registries =
be 100%=20
inclusive?</FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><FONT size=3D3><FONT=20
face=3D"Times New Roman">&nbsp;<o:p></o:p></FONT></FONT></P><SPAN=20
style=3D"FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; =
mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; =
mso-fareast-language: EN-US; mso-bidi-language: AR-SA">We=20
do not propose to define these policies in detail now, but should bear =
in mind=20
the eventual need to implement certain controls as we design the VO =
Registry=20
facilities</SPAN></FONT></DIV></DIV></BODY></HTML>

------=_NextPart_000_0021_01C2FF75.FAB41E80--

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From: "Robert Hanisch" <rjhanisch@worldnet.att.net>
To: "Elizabeth Auden" <eca@mssl.ucl.ac.uk>
Cc: <registry@ivoa.net>
References: <Pine.OSF.4.33.0304111157250.1239753-100000@msslai.mssl.ucl.ac.uk>
Subject: Re: policy issues
Date: Fri, 11 Apr 2003 08:00:43 -0400
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> Option 2 would be more work for various humans, but it may avoid entries
> for "Big BillyBob's Registry of Snazzy Stars".

Well, there goes my chance for fame and glory...

Bob

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Status:   

I think the emphasis of this document is slightly different
than what I'd like to see.  The issues that are brought up
are fine: what concerns me is the 'we'.  Rather than
trying to mandate some policy for all centers and registries,
it seems to me that what we need is to provide the model
and structure through which registries indicate what their
policies are rather than dictating some IVOA-wide policy.
My quick reaction to the policy concerns is given after each paragram.


	Tom

> 
> ·         Do we need to control or restrict in any way the ability of 
> groups or individuals to register resources and services?  Thus far we 
> have tried to be as open and inclusive as possible, though we then have 
> the risk of people registering poor quality or inappropriate services, 
> or of permitting some sort of malicious corruption to the registries.
> 

We should impose a policy, we should allow registries to
describe their policies. A registry should be able to indicate
that it is open to all entries or requires some screening
process and should indicate what that service entry or screening process is.

> ·         Should we develop some sort of VO endorsement for registered 
> resources and services, i.e., a “seal of approval”?  Such endorsements 
> could be managed by the various national projects, with a national 
> endorsement serving as an implicit IVOA endorsement for IVOA member 
> organizations.  What process should we use to review and grant such 
> endorsements?
> 

There should be a mechanism for indicating that a registry
entry has been endorsed by some validating authority,
but we should neither mandate nor forbid registries to
use such authorities, nor should the registry
be particularly concerned how or when the endorsement
is given.  The registry may need to worry about
being able to authenticate the endorsement if we
actually want to care about security for these things.
That may be overkill for astronomy data.

Registries should be able to choose which endorsements they use.
There may be many endorsing authorities.   This can
get recursive since there could be registries of
endorsing authorities, and authorities that endorse
endorsing authorities.

While this sounds kind of Alice-in-Wonderland'ish, I think
that actually what Bob may have in mind.  E.g., there would
be national endorsing authorities, which are endorsed by
some single IVOA authority.  A user asking for only IVOA-endorsed
data can look for services endorsed directly by the IVOA or by any of
the endorsing services that it has approved.

Note also, that endorsments mechanism may need to be conditional
and/or quantitative.  E.g., data may be endorsed for astrometric
purposes but not photometric, or the endorsement may indicate
that the astrometry is good to 0.1" and the photomtry to 0.1 mag.
The boundary between endorsements and descriptive metadata is
potentially quite thin.

However, I don't think this really needs to impact the registry
protocols much.  Registries just need to be able to include
endorsements as part of the descriptive metadata for a service
and allow users to query against it in much the same way.

The process to review and grant endorsements is completely
divorced from the registry to my mind.


> ·         We will need to have some editorial control over the 
> registries, e.g., to remove inappropriate and inactive resources and 
> services, and to correct erroneous entries.  Who should have this 
> responsibility, and how is editorial access controlled?

As for editorial control: that is up to the registry
provider.  I don't see this as being some master registry
that provide strict control over.  The policies at,
say, the CDS' registry may be very different from
one at MAST.

> 
> ·         Should we, and if so, how do we, control the number and 
> quality of registry servers/ services themselves?  How do we assure that 
> multiple registry services are properly synchronized?  Do we care if 
> different registries focus on different types of resources and services, 
> or should all registries be 100% inclusive?

Who is the 'we' here? If the IVOA or one of the national projects
wishes to build a registry ourselves through some mechanism
it should feel free to do so.  However I do not feel that we should be
getting into policing.  There is no reason why all registries should
be the same.  There may be site registries which contain only
a set of local services.  These may be harvested (by OAI or some other
mechanism) to get entries for more general registries.  There may
be registries of only SIA services or data of interest in ISM studies
or whatever.  Multiple registries  enable serving diverse communities.

So long as we put a requirement on registries such that they
are harvestable, it's inevitable that someone will build a registry
that combines data from other extent registries.

One specialized registry that will likely be needed is a registry of registries.
This might indeed be something that the IVOA wants to build itself,
but even here, I don't see that this needs to be exclusive -- others
can and probably will build such registry registries.


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Date: Fri, 11 Apr 2003 10:56:25 -0400
From: Tom McGlynn <Thomas.A.McGlynn@nasa.gov>
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To: Tom McGlynn <Thomas.A.McGlynn@nasa.gov>
CC: Robert Hanisch <hanisch@stsci.edu>, registry@ivoa.net
Subject: Re: policy issues
References: <002401c2ff97$81d37a20$7deca782@stsci.edu> <3E96D50C.5000602@nasa.gov>
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> 
> We should impose a policy, we should allow registries to
            ^not

Doubtless more typos later but this is sort of fundamental.

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From: Elizabeth Auden <eca@mssl.ucl.ac.uk>
To: Robert Hanisch <hanisch@stsci.edu>
cc: <registry@ivoa.net>
Subject: Re: policy issues
In-Reply-To: <002401c2ff97$81d37a20$7deca782@stsci.edu>
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Hello,

I only have opinions on two of Bob's policy questions for now:

> · Do we need to control or restrict in any way the ability of groups or
> individuals to register resources and services?

I suggest restricting this ability to groups / individuals registered with
a VO (ie, on Astrogrid they'd have to have an AstroPass certificate).  I
think this would reduce the risk of malicious entries or changes, and it
would make it much easier to track down erroneous changes made
accidentally by a legitimate user.

> · Should we, and if so, how do we, control the number and quality of
> registry servers/ services themselves?  How do we assure that multiple
> registry services are properly synchronized?  Do we care if different
> registries focus on different types of resources and services, or should
> all registries be 100% inclusive?

Different registries should be able to focus on different resources; there
could be one registry completely devoted to STP data, for example.  As
long as each registry has service listings for "other registries" along
with data provider, data transformation, and data storage services, then a
registry can pass a request for resources onto the other registries it
knows about.  Perhaps each registry could be configured to either 1)
automatically accept any new registry or registry service entries, or 2)
seek approval from the registry administrator before adding entries.
Option 2 would be more work for various humans, but it may avoid entries
for "Big BillyBob's Registry of Snazzy Stars".


As web services catch hold, there may be the possibility that they could
scan the web for automatic web services registers, latch on to them, and
inundate a registry with services that help you "win big by sending 30
MILLION AMERICAN DOLLARS to distressed Nigerian farmers".  I know that's a
rather paranoid stance, but it happened with email (and most of the IVOA
mail lists).

cheers,
Elizabeth



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Date: Fri, 11 Apr 2003 18:35:48 +0200
From: "Mark G.Allen" <allen@newb6.u-strasbg.fr>
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Subject: Review of VO science Cases in relation to Registries
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Hi Everyone,

I've made a quick review of the current VO science cases
with respect to registries. The idea is to motivate
discussion on the Key Science Cases to be used as drivers
for development of registries. Also I thought it might be useful
just to have a list of science cases on the same page.
I haven't gone so far as to draw general conclusions from them,
but this will be part of the next steps.

I've listed 5 of these cases as particularly relevant to
registries, onto the http://www.ivoa.net/twiki/bin/view/IVOA/IVOARegWp02
page, which we can call the v0.1 of the "Key Science Cases
for Registries" document which is scheduled for today, April 11.

More detailed analysis of these cases is needed. NVO have
done some of this with their draft Registry Use Cases and
draft Registry Requirements.

Other immediate questions are:

Are there elements of other science cases not picked up in
those drafts?

Do we need other Science Cases as drivers for Registry
development?

-Mark.



Review of VO Science Cases in Relation to VO Registries.
--------------------------------------------------------
                            v1.0 M.Allen. April 11, 2003.

A goal of RWP02 is to identify Key Science Cases to be used
as drivers for defining registry requirements. These should be
illustrative of the range of requests that may be sent to a
registry.

These notes are an attempt to review the current science cases
from the various VO initiatives, in relation to VO registries.
Some of the individual groups have already made some assessment
of their science cases with respect to registries, and these notes
draw directly from those assessments. I've paraphrased the various
cases, and made short notes with respect to registries. This is
really a first pass, and may sometimes border on statements of the obvious,
so please feel free to comment or change anything here.


List of Current VO Science Cases:
---------------------------------
  * AstroGrid *

AstroGrid has a fairly well developed set of science cases including
sequence diagrams described on the follow pages:
http://wiki.astrogrid.org/bin/view/Astrogrid/ScienceProblems
http://wiki.astrogrid.org/bin/view/Astrogrid/SequenceDiagrams

   1. Brown Dwarf Selection
   2. Deep Field Surveys
   3. Galaxy Clustering
   4. Hi-Z Quasars
   5. Low Surface Brightness Galaxy Discovery
   6. Magnetic Storm Onset
   7. Solar Coronal Waves
   8. Solar Stellar Flare Comparison
   9. STP Solar Event Coincidence
  10. Supernova Galaxy Environment


  * NVO *

NVO developed a number of science drivers for their demos, and also have
a number of Registry Science/Use Cases posted to the Registry mail list.

  (N.Gaffney)
  1. Find Super Novae Pre-Burst Observations
  2. Select Dwarf Galaxies by Colour for Observational Follow-up
  3. Construct Highest Signal-to-Noise V-band image of sky region 
 
  (T.McGlynn)
  1.  Find all object catalogs derived from a mission
  2.  Find queriable image-cutout services with sky coverage and
       galactic coordinate criteria.

  Gamma Ray Burst Demo +

  Other demo cases...


  * AstroVirtel *
 
AstroVirtel have a draft document on the registry relevant aspects
of one of their current science cases:
Luminosity functions of Star Clusters in Nearby Galaxies (De Grijs).
The document is on the wiki at
http://www.ivoa.net/internal/IVOA/RegistryUseCases/astrovirtel_use_case.pdf
(A.Micol)


  * AVO demo science case *
   This science case was related to finding red objects in the GOODS
   data. The demo used the GLU as implemented with a customized Aladin
   and a VOTABLE metadata tree that works a bit like a registry, but
   perhaps this is more related to data model issues. (A general
   meta-data tree function for Aladin is to be announced on the DM
   mailing list very soon)


Notes on the Current Science Cases with respect to Registries:
--------------------------------------------------------------

* AstroGrid *
This is taken directly from their sequence diagrams where "resource
catalog" is taken to mean Registry. (is that correct?)


   1. Brown Dwarf Selection

    * Search the resource catalog for catalogs containing Galactic clusters
    - Registry needs to be able to identify resources which provide
       catalogs, and be able to find those relevant to "Galactic Clusters"

    * Query registry for catalogs with coverage of I, K, or R wavelengths
       over each cluster location
    - Registry needs to be able to select catalogs based on wavelength
       and spatial coverage
     
    - In general the registry is expected to return lists of catalogs


   2. Deep Field Surveys
 
    * Search the resource catalog for optical and radio deep field
       surveys with wavelength, instrument, sensitivity, dynamic range,
       epoch, and resolution metadata. A list of surveys is returned and
       one or more are selected
    - Registry needs to be able to identify deep field surveys
    - Registry needs observation specific info: instrument, sensitivity,
        dynamic range, resolution
    - Registry needs epoch or temporal coverage information
    - Registry is assumed to return lists of surveys/catalogs with the
       possibility of making selections from these.

        
   3. Galaxy Clustering

    * Search the registry for galaxy catalogs.
    - Registry needs to be able to identify galaxy catalogs

    * After selecting sources, search the registry for a spectrographic
      catalog to query by coordinates.
    - Registry needs to be able to identify resources with spectral
      catalogs, and say whether those catalogs can be queried by coordinates
 
   4. Hi-Z Quasars
   
    * This case is focused on using large surveys
    - Registry required to locate those survey resources, and provide
      information on how they can be queried.

   5. Low Surface Brightness Galaxy Discovery

    * Locate large scale structure with low contrast to background
    - Registry needed to locate surveys, how to query them...

   6. Magnetic Storm Onset

    * Locate an on-line source of data for that spacecraft and request
      data for a time window around each magnetic storm.
    - Registry required to locate data source, and whether it can query
      with temporal parameters.
 
   7. Solar Coronal Waves
   8. Solar Stellar Flare Comparison
   9. STP Solar Event Coincidence

  10. Supernova Galaxy Environment

    * Search literature and published sources for possible spectroscopic
       redshifts of galaxies in fields.
    - Registry provides location of publication resources, and how
      to query them for keywords like "galaxy" and "redshift"

    * Search archives for spectroscopic data of objects in field
    - Registry needs to identify spectroscopic databases
    - Registry needs spatial coverage information for databases

* NVO *

  1. Find Super Novae Pre-Burst Observation
    
   * get all IR, Optical, and UV data (derived photometry or images or
      spectra) from any data source that may have been observing it
      during a specified time period
   - Registry required to locate all data at a given point, i.e. spatial
     and temporal coverage
 
   * get all observations that have a chance of detecting/resolving it
   - Registry would need sensitivity and resolution information about
     observational data.

  2. Select Dwarf Galaxies by Colour for Observational Follow-up
   
   * get colors U-K and R-H (either colors, magnitudes, or data from
      which magnitudes can be extracted in that order) for dwarf galaxies
      with known V magnitudes and redshift or absolute V magnitudes
   - Registry needs to identify catalogs of dwarf galaxies, and
      whether they contain colour or magnitude measurements
 
   * I would like to know which services that provide the colors I
      need are based on other data in the VO, so I don't redo the
      color measurement when I don't have to
   - Requires knowledge of provenance of data in catalogs


 3. Construct Highest Signal-to-Noise V-band image of sky region 
 
  * need all independent observations (e.g. not based
    on the same raw data) at V of this area of the sky that have a
    resolution and pixel size on the sky of at least 1 and 0.5 arcseconds
    respectively
  - Registry needs to identify independent obs in a region of sky
  - Requires resolution and pixel size information of registered
     archives. 

 4. Gamma Ray burst +
   
    Not detailed here, but RayPlante says he'll:
    "Summarize how a registry will be incorporated into the NVO Gamma Ray
    Burster demo (making it a general-purpose "show me the sky" tool)."



* AstroVirtel *

  Alberto's document provides quite a lot of detail from their
  practical experience of running VO-like science cases. Here
  I've tried to make a summary for general consumption.

  Types of Service identified within a Registry
  --------------------------------------------
  The AstroVirtel use case scenario identifies requirements
  for registries, in terms of the types of services a
  registry should be able to identify.

  The types specific to the given example scenario are

  - Catalog Browser Services - e.g. a catalog search engine like VizieR

  - Services relating to a particular class of astronomical
     objects, e.g. Galaxies

  - Services providing particular types of data, e.g. Astronomical
     Object Catalogs, Image Data

  - Services that directly provide particular output parameters
     e.g  galaxy name ID, galaxy position, galaxy type

  - Services that can be constrained by a given parameter, such
     as distance.


    Further, registered services should give some idea of the
    - number of records available
    - wavelength or passband coverage
    - minimum resolution
    - calibration status of data


From - Fri Apr 11 21:55:26 2003
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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: <registry@ivoa.net>
Subject: RE: Review of VO science Cases in relation to Registries
Date: Fri, 11 Apr 2003 20:43:42 +0100
Organization: University of Leicester
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Status:   

Excellent work Mark & the others involved in Rwp02. Can I ask the other work
package leaders to likewise get their scope and plans loaded into the
IVOARegWp__ wiki pages, please. I'll then produce a coordinated plan.

My apologies for the late delivery of the document standards - I'm adapting
the GGF standards and will post proposals either this weekend or early next
week.

Cheers,
Tony. 

> -----Original Message-----
> From: Mark G.Allen [mailto:allen@newb6.u-strasbg.fr] 
> Sent: 11 April 2003 17:36
> To: registry@ivoa.net
> Subject: Review of VO science Cases in relation to Registries
> 
> 
> Hi Everyone,
> 
> I've made a quick review of the current VO science cases
> with respect to registries. The idea is to motivate
> discussion on the Key Science Cases to be used as drivers
> for development of registries. Also I thought it might be 
> useful just to have a list of science cases on the same page. 
> I haven't gone so far as to draw general conclusions from 
> them, but this will be part of the next steps.
> 
> I've listed 5 of these cases as particularly relevant to 
> registries, onto the 
> http://www.ivoa.net/twiki/bin/view/IVOA/IVOARegWp02
> page, which we can call the v0.1 of the "Key Science Cases
> for Registries" document which is scheduled for today, April 11.
> 
> More detailed analysis of these cases is needed. NVO have
> done some of this with their draft Registry Use Cases and
> draft Registry Requirements.
> 
> Other immediate questions are:
> 
> Are there elements of other science cases not picked up in 
> those drafts?
> 
> Do we need other Science Cases as drivers for Registry development?
> 
> -Mark.
> 
> 
> 
> Review of VO Science Cases in Relation to VO Registries.
> --------------------------------------------------------
>                             v1.0 M.Allen. April 11, 2003.
> 
> A goal of RWP02 is to identify Key Science Cases to be used
> as drivers for defining registry requirements. These should 
> be illustrative of the range of requests that may be sent to 
> a registry.
> 
> These notes are an attempt to review the current science 
> cases from the various VO initiatives, in relation to VO 
> registries. Some of the individual groups have already made 
> some assessment of their science cases with respect to 
> registries, and these notes draw directly from those 
> assessments. I've paraphrased the various cases, and made 
> short notes with respect to registries. This is really a 
> first pass, and may sometimes border on statements of the 
> obvious, so please feel free to comment or change anything here.
> 
> 
> List of Current VO Science Cases:
> ---------------------------------
>   * AstroGrid *
> 
> AstroGrid has a fairly well developed set of science cases 
> including sequence diagrams described on the follow pages: 
> http://wiki.astrogrid.org/bin/view/Astrogrid/ScienceProblems
> http://wiki.astrogrid.org/bin/view/Astrogrid/SequenceDiagrams
> 
>    1. Brown Dwarf Selection
>    2. Deep Field Surveys
>    3. Galaxy Clustering
>    4. Hi-Z Quasars
>    5. Low Surface Brightness Galaxy Discovery
>    6. Magnetic Storm Onset
>    7. Solar Coronal Waves
>    8. Solar Stellar Flare Comparison
>    9. STP Solar Event Coincidence
>   10. Supernova Galaxy Environment
> 
> 
>   * NVO *
> 
> NVO developed a number of science drivers for their demos, 
> and also have a number of Registry Science/Use Cases posted 
> to the Registry mail list.
> 
>   (N.Gaffney)
>   1. Find Super Novae Pre-Burst Observations
>   2. Select Dwarf Galaxies by Colour for Observational Follow-up
>   3. Construct Highest Signal-to-Noise V-band image of sky region 
>  
>   (T.McGlynn)
>   1.  Find all object catalogs derived from a mission
>   2.  Find queriable image-cutout services with sky coverage and
>        galactic coordinate criteria.
> 
>   Gamma Ray Burst Demo +
> 
>   Other demo cases...
> 
> 
>   * AstroVirtel *
>  
> AstroVirtel have a draft document on the registry relevant 
> aspects of one of their current science cases: Luminosity 
> functions of Star Clusters in Nearby Galaxies (De Grijs). The 
> document is on the wiki at 
> http://www.ivoa.net/internal/IVOA/RegistryUseCases/astrovirtel
> _use_case.pdf
> (A.Micol)
> 
> 
>   * AVO demo science case *
>    This science case was related to finding red objects in the GOODS
>    data. The demo used the GLU as implemented with a customized Aladin
>    and a VOTABLE metadata tree that works a bit like a registry, but
>    perhaps this is more related to data model issues. (A general
>    meta-data tree function for Aladin is to be announced on the DM
>    mailing list very soon)
> 
> 
> Notes on the Current Science Cases with respect to Registries:
> --------------------------------------------------------------
> 
> * AstroGrid *
> This is taken directly from their sequence diagrams where 
> "resource catalog" is taken to mean Registry. (is that correct?)
> 
> 
>    1. Brown Dwarf Selection
> 
>     * Search the resource catalog for catalogs containing 
> Galactic clusters
>     - Registry needs to be able to identify resources which provide
>        catalogs, and be able to find those relevant to 
> "Galactic Clusters"
> 
>     * Query registry for catalogs with coverage of I, K, or R 
> wavelengths
>        over each cluster location
>     - Registry needs to be able to select catalogs based on wavelength
>        and spatial coverage
>      
>     - In general the registry is expected to return lists of catalogs
> 
> 
>    2. Deep Field Surveys
>  
>     * Search the resource catalog for optical and radio deep field
>        surveys with wavelength, instrument, sensitivity, 
> dynamic range,
>        epoch, and resolution metadata. A list of surveys is 
> returned and
>        one or more are selected
>     - Registry needs to be able to identify deep field surveys
>     - Registry needs observation specific info: instrument, 
> sensitivity,
>         dynamic range, resolution
>     - Registry needs epoch or temporal coverage information
>     - Registry is assumed to return lists of surveys/catalogs with the
>        possibility of making selections from these.
> 
>         
>    3. Galaxy Clustering
> 
>     * Search the registry for galaxy catalogs.
>     - Registry needs to be able to identify galaxy catalogs
> 
>     * After selecting sources, search the registry for a 
> spectrographic
>       catalog to query by coordinates.
>     - Registry needs to be able to identify resources with spectral
>       catalogs, and say whether those catalogs can be queried 
> by coordinates
>  
>    4. Hi-Z Quasars
>    
>     * This case is focused on using large surveys
>     - Registry required to locate those survey resources, and provide
>       information on how they can be queried.
> 
>    5. Low Surface Brightness Galaxy Discovery
> 
>     * Locate large scale structure with low contrast to background
>     - Registry needed to locate surveys, how to query them...
> 
>    6. Magnetic Storm Onset
> 
>     * Locate an on-line source of data for that spacecraft and request
>       data for a time window around each magnetic storm.
>     - Registry required to locate data source, and whether it 
> can query
>       with temporal parameters.
>  
>    7. Solar Coronal Waves
>    8. Solar Stellar Flare Comparison
>    9. STP Solar Event Coincidence
> 
>   10. Supernova Galaxy Environment
> 
>     * Search literature and published sources for possible 
> spectroscopic
>        redshifts of galaxies in fields.
>     - Registry provides location of publication resources, and how
>       to query them for keywords like "galaxy" and "redshift"
> 
>     * Search archives for spectroscopic data of objects in field
>     - Registry needs to identify spectroscopic databases
>     - Registry needs spatial coverage information for databases
> 
> * NVO *
> 
>   1. Find Super Novae Pre-Burst Observation
>     
>    * get all IR, Optical, and UV data (derived photometry or images or
>       spectra) from any data source that may have been observing it
>       during a specified time period
>    - Registry required to locate all data at a given point, 
> i.e. spatial
>      and temporal coverage
>  
>    * get all observations that have a chance of detecting/resolving it
>    - Registry would need sensitivity and resolution information about
>      observational data.
> 
>   2. Select Dwarf Galaxies by Colour for Observational Follow-up
>    
>    * get colors U-K and R-H (either colors, magnitudes, or data from
>       which magnitudes can be extracted in that order) for 
> dwarf galaxies
>       with known V magnitudes and redshift or absolute V magnitudes
>    - Registry needs to identify catalogs of dwarf galaxies, and
>       whether they contain colour or magnitude measurements
>  
>    * I would like to know which services that provide the colors I
>       need are based on other data in the VO, so I don't redo the
>       color measurement when I don't have to
>    - Requires knowledge of provenance of data in catalogs
> 
> 
>  3. Construct Highest Signal-to-Noise V-band image of sky region 
>  
>   * need all independent observations (e.g. not based
>     on the same raw data) at V of this area of the sky that have a
>     resolution and pixel size on the sky of at least 1 and 
> 0.5 arcseconds
>     respectively
>   - Registry needs to identify independent obs in a region of sky
>   - Requires resolution and pixel size information of registered
>      archives. 
> 
>  4. Gamma Ray burst +
>    
>     Not detailed here, but RayPlante says he'll:
>     "Summarize how a registry will be incorporated into the 
> NVO Gamma Ray
>     Burster demo (making it a general-purpose "show me the 
> sky" tool)."
> 
> 
> 
> * AstroVirtel *
> 
>   Alberto's document provides quite a lot of detail from their
>   practical experience of running VO-like science cases. Here
>   I've tried to make a summary for general consumption.
> 
>   Types of Service identified within a Registry
>   --------------------------------------------
>   The AstroVirtel use case scenario identifies requirements
>   for registries, in terms of the types of services a
>   registry should be able to identify.
> 
>   The types specific to the given example scenario are
> 
>   - Catalog Browser Services - e.g. a catalog search engine 
> like VizieR
> 
>   - Services relating to a particular class of astronomical
>      objects, e.g. Galaxies
> 
>   - Services providing particular types of data, e.g. Astronomical
>      Object Catalogs, Image Data
> 
>   - Services that directly provide particular output parameters
>      e.g  galaxy name ID, galaxy position, galaxy type
> 
>   - Services that can be constrained by a given parameter, such
>      as distance.
> 
> 
>     Further, registered services should give some idea of the
>     - number of records available
>     - wavelength or passband coverage
>     - minimum resolution
>     - calibration status of data
> 
> 

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Date: Fri, 11 Apr 2003 21:21:37 +0100 (BST)
From: Nicholas Walton <naw@ast.cam.ac.uk>
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To: "Mark G.Allen" <allen@newb6.u-strasbg.fr>
cc: registry@ivoa.net
Subject: Re: Review of VO science Cases in relation to Registries
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Hi Mark,

worth noting that the AstroVirtel Querator tool was developed specifically
to address the 'Find Super Novae Pre-Burst Observation' question - so I
guess the AstroVirtel folk will have insight into this one from a pratical
point of view.

heers, Nic

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


On Fri, 11 Apr 2003, Mark G.Allen wrote:

> Hi Everyone,
>
> I've made a quick review of the current VO science cases
> with respect to registries. The idea is to motivate
> discussion on the Key Science Cases to be used as drivers
> for development of registries. Also I thought it might be useful
> just to have a list of science cases on the same page.
> I haven't gone so far as to draw general conclusions from them,
> but this will be part of the next steps.
>
> I've listed 5 of these cases as particularly relevant to
> registries, onto the http://www.ivoa.net/twiki/bin/view/IVOA/IVOARegWp02
> page, which we can call the v0.1 of the "Key Science Cases
> for Registries" document which is scheduled for today, April 11.
>
> More detailed analysis of these cases is needed. NVO have
> done some of this with their draft Registry Use Cases and
> draft Registry Requirements.
>
> Other immediate questions are:
>
> Are there elements of other science cases not picked up in
> those drafts?
>
> Do we need other Science Cases as drivers for Registry
> development?
>
> -Mark.
>
>
>
> Review of VO Science Cases in Relation to VO Registries.
> --------------------------------------------------------
>                             v1.0 M.Allen. April 11, 2003.
>
> A goal of RWP02 is to identify Key Science Cases to be used
> as drivers for defining registry requirements. These should be
> illustrative of the range of requests that may be sent to a
> registry.
>
> These notes are an attempt to review the current science cases
> from the various VO initiatives, in relation to VO registries.
> Some of the individual groups have already made some assessment
> of their science cases with respect to registries, and these notes
> draw directly from those assessments. I've paraphrased the various
> cases, and made short notes with respect to registries. This is
> really a first pass, and may sometimes border on statements of the obvious,
> so please feel free to comment or change anything here.
>
>
> List of Current VO Science Cases:
> ---------------------------------
>   * AstroGrid *
>
> AstroGrid has a fairly well developed set of science cases including
> sequence diagrams described on the follow pages:
> http://wiki.astrogrid.org/bin/view/Astrogrid/ScienceProblems
> http://wiki.astrogrid.org/bin/view/Astrogrid/SequenceDiagrams
>
>    1. Brown Dwarf Selection
>    2. Deep Field Surveys
>    3. Galaxy Clustering
>    4. Hi-Z Quasars
>    5. Low Surface Brightness Galaxy Discovery
>    6. Magnetic Storm Onset
>    7. Solar Coronal Waves
>    8. Solar Stellar Flare Comparison
>    9. STP Solar Event Coincidence
>   10. Supernova Galaxy Environment
>
>
>   * NVO *
>
> NVO developed a number of science drivers for their demos, and also have
> a number of Registry Science/Use Cases posted to the Registry mail list.
>
>   (N.Gaffney)
>   1. Find Super Novae Pre-Burst Observations
>   2. Select Dwarf Galaxies by Colour for Observational Follow-up
>   3. Construct Highest Signal-to-Noise V-band image of sky region
>
>   (T.McGlynn)
>   1.  Find all object catalogs derived from a mission
>   2.  Find queriable image-cutout services with sky coverage and
>        galactic coordinate criteria.
>
>   Gamma Ray Burst Demo +
>
>   Other demo cases...
>
>
>   * AstroVirtel *
>
> AstroVirtel have a draft document on the registry relevant aspects
> of one of their current science cases:
> Luminosity functions of Star Clusters in Nearby Galaxies (De Grijs).
> The document is on the wiki at
> http://www.ivoa.net/internal/IVOA/RegistryUseCases/astrovirtel_use_case.pdf
> (A.Micol)
>
>
>   * AVO demo science case *
>    This science case was related to finding red objects in the GOODS
>    data. The demo used the GLU as implemented with a customized Aladin
>    and a VOTABLE metadata tree that works a bit like a registry, but
>    perhaps this is more related to data model issues. (A general
>    meta-data tree function for Aladin is to be announced on the DM
>    mailing list very soon)
>
>
> Notes on the Current Science Cases with respect to Registries:
> --------------------------------------------------------------
>
> * AstroGrid *
> This is taken directly from their sequence diagrams where "resource
> catalog" is taken to mean Registry. (is that correct?)
>
>
>    1. Brown Dwarf Selection
>
>     * Search the resource catalog for catalogs containing Galactic clusters
>     - Registry needs to be able to identify resources which provide
>        catalogs, and be able to find those relevant to "Galactic Clusters"
>
>     * Query registry for catalogs with coverage of I, K, or R wavelengths
>        over each cluster location
>     - Registry needs to be able to select catalogs based on wavelength
>        and spatial coverage
>
>     - In general the registry is expected to return lists of catalogs
>
>
>    2. Deep Field Surveys
>
>     * Search the resource catalog for optical and radio deep field
>        surveys with wavelength, instrument, sensitivity, dynamic range,
>        epoch, and resolution metadata. A list of surveys is returned and
>        one or more are selected
>     - Registry needs to be able to identify deep field surveys
>     - Registry needs observation specific info: instrument, sensitivity,
>         dynamic range, resolution
>     - Registry needs epoch or temporal coverage information
>     - Registry is assumed to return lists of surveys/catalogs with the
>        possibility of making selections from these.
>
>
>    3. Galaxy Clustering
>
>     * Search the registry for galaxy catalogs.
>     - Registry needs to be able to identify galaxy catalogs
>
>     * After selecting sources, search the registry for a spectrographic
>       catalog to query by coordinates.
>     - Registry needs to be able to identify resources with spectral
>       catalogs, and say whether those catalogs can be queried by coordinates
>
>    4. Hi-Z Quasars
>
>     * This case is focused on using large surveys
>     - Registry required to locate those survey resources, and provide
>       information on how they can be queried.
>
>    5. Low Surface Brightness Galaxy Discovery
>
>     * Locate large scale structure with low contrast to background
>     - Registry needed to locate surveys, how to query them...
>
>    6. Magnetic Storm Onset
>
>     * Locate an on-line source of data for that spacecraft and request
>       data for a time window around each magnetic storm.
>     - Registry required to locate data source, and whether it can query
>       with temporal parameters.
>
>    7. Solar Coronal Waves
>    8. Solar Stellar Flare Comparison
>    9. STP Solar Event Coincidence
>
>   10. Supernova Galaxy Environment
>
>     * Search literature and published sources for possible spectroscopic
>        redshifts of galaxies in fields.
>     - Registry provides location of publication resources, and how
>       to query them for keywords like "galaxy" and "redshift"
>
>     * Search archives for spectroscopic data of objects in field
>     - Registry needs to identify spectroscopic databases
>     - Registry needs spatial coverage information for databases
>
> * NVO *
>
>   1. Find Super Novae Pre-Burst Observation
>
>    * get all IR, Optical, and UV data (derived photometry or images or
>       spectra) from any data source that may have been observing it
>       during a specified time period
>    - Registry required to locate all data at a given point, i.e. spatial
>      and temporal coverage
>
>    * get all observations that have a chance of detecting/resolving it
>    - Registry would need sensitivity and resolution information about
>      observational data.
>
>   2. Select Dwarf Galaxies by Colour for Observational Follow-up
>
>    * get colors U-K and R-H (either colors, magnitudes, or data from
>       which magnitudes can be extracted in that order) for dwarf galaxies
>       with known V magnitudes and redshift or absolute V magnitudes
>    - Registry needs to identify catalogs of dwarf galaxies, and
>       whether they contain colour or magnitude measurements
>
>    * I would like to know which services that provide the colors I
>       need are based on other data in the VO, so I don't redo the
>       color measurement when I don't have to
>    - Requires knowledge of provenance of data in catalogs
>
>
>  3. Construct Highest Signal-to-Noise V-band image of sky region
>
>   * need all independent observations (e.g. not based
>     on the same raw data) at V of this area of the sky that have a
>     resolution and pixel size on the sky of at least 1 and 0.5 arcseconds
>     respectively
>   - Registry needs to identify independent obs in a region of sky
>   - Requires resolution and pixel size information of registered
>      archives.
>
>  4. Gamma Ray burst +
>
>     Not detailed here, but RayPlante says he'll:
>     "Summarize how a registry will be incorporated into the NVO Gamma Ray
>     Burster demo (making it a general-purpose "show me the sky" tool)."
>
>
>
> * AstroVirtel *
>
>   Alberto's document provides quite a lot of detail from their
>   practical experience of running VO-like science cases. Here
>   I've tried to make a summary for general consumption.
>
>   Types of Service identified within a Registry
>   --------------------------------------------
>   The AstroVirtel use case scenario identifies requirements
>   for registries, in terms of the types of services a
>   registry should be able to identify.
>
>   The types specific to the given example scenario are
>
>   - Catalog Browser Services - e.g. a catalog search engine like VizieR
>
>   - Services relating to a particular class of astronomical
>      objects, e.g. Galaxies
>
>   - Services providing particular types of data, e.g. Astronomical
>      Object Catalogs, Image Data
>
>   - Services that directly provide particular output parameters
>      e.g  galaxy name ID, galaxy position, galaxy type
>
>   - Services that can be constrained by a given parameter, such
>      as distance.
>
>
>     Further, registered services should give some idea of the
>     - number of records available
>     - wavelength or passband coverage
>     - minimum resolution
>     - calibration status of data
>
>

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Date: Fri, 11 Apr 2003 18:35:48 +0200
From: "Mark G.Allen" <allen@newb6.u-strasbg.fr>
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Status:   

Hi Everyone,

I've made a quick review of the current VO science cases
with respect to registries. The idea is to motivate
discussion on the Key Science Cases to be used as drivers
for development of registries. Also I thought it might be useful
just to have a list of science cases on the same page.
I haven't gone so far as to draw general conclusions from them,
but this will be part of the next steps.

I've listed 5 of these cases as particularly relevant to
registries, onto the http://www.ivoa.net/twiki/bin/view/IVOA/IVOARegWp02
page, which we can call the v0.1 of the "Key Science Cases
for Registries" document which is scheduled for today, April 11.

More detailed analysis of these cases is needed. NVO have
done some of this with their draft Registry Use Cases and
draft Registry Requirements.

Other immediate questions are:

Are there elements of other science cases not picked up in
those drafts?

Do we need other Science Cases as drivers for Registry
development?

-Mark.



Review of VO Science Cases in Relation to VO Registries.
--------------------------------------------------------
                            v1.0 M.Allen. April 11, 2003.

A goal of RWP02 is to identify Key Science Cases to be used
as drivers for defining registry requirements. These should be
illustrative of the range of requests that may be sent to a
registry.

These notes are an attempt to review the current science cases
from the various VO initiatives, in relation to VO registries.
Some of the individual groups have already made some assessment
of their science cases with respect to registries, and these notes
draw directly from those assessments. I've paraphrased the various
cases, and made short notes with respect to registries. This is
really a first pass, and may sometimes border on statements of the obvious,
so please feel free to comment or change anything here.


List of Current VO Science Cases:
---------------------------------
  * AstroGrid *

AstroGrid has a fairly well developed set of science cases including
sequence diagrams described on the follow pages:
http://wiki.astrogrid.org/bin/view/Astrogrid/ScienceProblems
http://wiki.astrogrid.org/bin/view/Astrogrid/SequenceDiagrams

   1. Brown Dwarf Selection
   2. Deep Field Surveys
   3. Galaxy Clustering
   4. Hi-Z Quasars
   5. Low Surface Brightness Galaxy Discovery
   6. Magnetic Storm Onset
   7. Solar Coronal Waves
   8. Solar Stellar Flare Comparison
   9. STP Solar Event Coincidence
  10. Supernova Galaxy Environment


  * NVO *

NVO developed a number of science drivers for their demos, and also have
a number of Registry Science/Use Cases posted to the Registry mail list.

  (N.Gaffney)
  1. Find Super Novae Pre-Burst Observations
  2. Select Dwarf Galaxies by Colour for Observational Follow-up
  3. Construct Highest Signal-to-Noise V-band image of sky region 
 
  (T.McGlynn)
  1.  Find all object catalogs derived from a mission
  2.  Find queriable image-cutout services with sky coverage and
       galactic coordinate criteria.

  Gamma Ray Burst Demo +

  Other demo cases...


  * AstroVirtel *
 
AstroVirtel have a draft document on the registry relevant aspects
of one of their current science cases:
Luminosity functions of Star Clusters in Nearby Galaxies (De Grijs).
The document is on the wiki at
http://www.ivoa.net/internal/IVOA/RegistryUseCases/astrovirtel_use_case.pdf
(A.Micol)


  * AVO demo science case *
   This science case was related to finding red objects in the GOODS
   data. The demo used the GLU as implemented with a customized Aladin
   and a VOTABLE metadata tree that works a bit like a registry, but
   perhaps this is more related to data model issues. (A general
   meta-data tree function for Aladin is to be announced on the DM
   mailing list very soon)


Notes on the Current Science Cases with respect to Registries:
--------------------------------------------------------------

* AstroGrid *
This is taken directly from their sequence diagrams where "resource
catalog" is taken to mean Registry. (is that correct?)


   1. Brown Dwarf Selection

    * Search the resource catalog for catalogs containing Galactic clusters
    - Registry needs to be able to identify resources which provide
       catalogs, and be able to find those relevant to "Galactic Clusters"

    * Query registry for catalogs with coverage of I, K, or R wavelengths
       over each cluster location
    - Registry needs to be able to select catalogs based on wavelength
       and spatial coverage
     
    - In general the registry is expected to return lists of catalogs


   2. Deep Field Surveys
 
    * Search the resource catalog for optical and radio deep field
       surveys with wavelength, instrument, sensitivity, dynamic range,
       epoch, and resolution metadata. A list of surveys is returned and
       one or more are selected
    - Registry needs to be able to identify deep field surveys
    - Registry needs observation specific info: instrument, sensitivity,
        dynamic range, resolution
    - Registry needs epoch or temporal coverage information
    - Registry is assumed to return lists of surveys/catalogs with the
       possibility of making selections from these.

        
   3. Galaxy Clustering

    * Search the registry for galaxy catalogs.
    - Registry needs to be able to identify galaxy catalogs

    * After selecting sources, search the registry for a spectrographic
      catalog to query by coordinates.
    - Registry needs to be able to identify resources with spectral
      catalogs, and say whether those catalogs can be queried by coordinates
 
   4. Hi-Z Quasars
   
    * This case is focused on using large surveys
    - Registry required to locate those survey resources, and provide
      information on how they can be queried.

   5. Low Surface Brightness Galaxy Discovery

    * Locate large scale structure with low contrast to background
    - Registry needed to locate surveys, how to query them...

   6. Magnetic Storm Onset

    * Locate an on-line source of data for that spacecraft and request
      data for a time window around each magnetic storm.
    - Registry required to locate data source, and whether it can query
      with temporal parameters.
 
   7. Solar Coronal Waves
   8. Solar Stellar Flare Comparison
   9. STP Solar Event Coincidence

  10. Supernova Galaxy Environment

    * Search literature and published sources for possible spectroscopic
       redshifts of galaxies in fields.
    - Registry provides location of publication resources, and how
      to query them for keywords like "galaxy" and "redshift"

    * Search archives for spectroscopic data of objects in field
    - Registry needs to identify spectroscopic databases
    - Registry needs spatial coverage information for databases

* NVO *

  1. Find Super Novae Pre-Burst Observation
    
   * get all IR, Optical, and UV data (derived photometry or images or
      spectra) from any data source that may have been observing it
      during a specified time period
   - Registry required to locate all data at a given point, i.e. spatial
     and temporal coverage
 
   * get all observations that have a chance of detecting/resolving it
   - Registry would need sensitivity and resolution information about
     observational data.

  2. Select Dwarf Galaxies by Colour for Observational Follow-up
   
   * get colors U-K and R-H (either colors, magnitudes, or data from
      which magnitudes can be extracted in that order) for dwarf galaxies
      with known V magnitudes and redshift or absolute V magnitudes
   - Registry needs to identify catalogs of dwarf galaxies, and
      whether they contain colour or magnitude measurements
 
   * I would like to know which services that provide the colors I
      need are based on other data in the VO, so I don't redo the
      color measurement when I don't have to
   - Requires knowledge of provenance of data in catalogs


 3. Construct Highest Signal-to-Noise V-band image of sky region 
 
  * need all independent observations (e.g. not based
    on the same raw data) at V of this area of the sky that have a
    resolution and pixel size on the sky of at least 1 and 0.5 arcseconds
    respectively
  - Registry needs to identify independent obs in a region of sky
  - Requires resolution and pixel size information of registered
     archives. 

 4. Gamma Ray burst +
   
    Not detailed here, but RayPlante says he'll:
    "Summarize how a registry will be incorporated into the NVO Gamma Ray
    Burster demo (making it a general-purpose "show me the sky" tool)."



* AstroVirtel *

  Alberto's document provides quite a lot of detail from their
  practical experience of running VO-like science cases. Here
  I've tried to make a summary for general consumption.

  Types of Service identified within a Registry
  --------------------------------------------
  The AstroVirtel use case scenario identifies requirements
  for registries, in terms of the types of services a
  registry should be able to identify.

  The types specific to the given example scenario are

  - Catalog Browser Services - e.g. a catalog search engine like VizieR

  - Services relating to a particular class of astronomical
     objects, e.g. Galaxies

  - Services providing particular types of data, e.g. Astronomical
     Object Catalogs, Image Data

  - Services that directly provide particular output parameters
     e.g  galaxy name ID, galaxy position, galaxy type

  - Services that can be constrained by a given parameter, such
     as distance.


    Further, registered services should give some idea of the
    - number of records available
    - wavelength or passband coverage
    - minimum resolution
    - calibration status of data


From - Sun Apr 13 17:25:29 2003
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Date: Sun, 13 Apr 2003 16:19:53 +0100 (BST)
From: Anita Richards <amsr@jb.man.ac.uk>
To: registry@ivoa.net
Subject: Re: Review of VO science Cases in relation to Registries
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Dear Mark and everyone,

The 5 priorities look fine to start with - I guess I should work on the
AstroGrid ones (Brown Dwarfs and Deep Fields).

>From an AstroGrid point of view we should also be developing Solar and
Solar/STP cases?  And it might be useful to work on something which will
be relevant to the IAU demo ie the LSB galaxies one... maybe Elizabeth and
Mark can decide if that would be useful to the AVOA group of if we should
start just inside AstroGrid at the appropriate time.

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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From: Anita Richards <amsr@jb.man.ac.uk>
To: registry@ivoa.net
Subject: Re: policy issues
In-Reply-To: <Pine.LNX.4.53.0304131615100.28204@aife.jb.man.ac.uk>
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Hello,

A response to one of Tom McGlynn's comments:
"Note also, that endorsments mechanism may need to be conditional
"and/or quantitative. E.g., data may be endorsed for astrometric
"purposes but not photometric, or the endorsement may indicate
"that the astrometry is good to 0.1" and the photomtry to 0.1 mag. "

I think the accuracy of the data themselves is a separate issue from the
accuracy of the metadata.  This is perhaps another 'policy issue' but the
view which makes most sense to me from previous debates, is that the
responsibility of the Registry is to make sure the metadata describe the
contents of the dataset adequately.  That is, there should be metadata to
describe the accuracy of the
astrometry
photometry
time resolution
etc. etc.
Within the catalogue this may be quite complicated (e.g. separate
systematic and random errors, dependence on other quantities) but for the
registry we need to pick out a value or a range for each measure of
accuracy which we decide is important for data-set selection.

If something is missing then the Registry maintenance should make an
educated guess wherever possible or cost-effective (some things can be
derived from the contents of a catalogue, initially or for major datasets
a quick human scan, or eventually links to instrument parameters etc.) -
information supplied by the Registry should be noted as such - CDS do
similar things such as providing the best coordinates for an object.

If an educated guess is not possible then the relevant accuracy parameter
is undefined, and 'undefined' should lead to exclusion of that data set
from searches requiring more than a certain accuracy (thus it is important
that the Registry does supply at leasts one limit to accuracy where
possible).

However the VO should not 'endorse' data on the basis of 'good' or 'bad'
astrometry etc. as 'good' and 'bad' depend entirely on what you want the
data for.

In some cases the user may specify the required accuracy.

In other cases this may be implicit in the execution of the query, for
example calculating proper motions can be done with data of any accuracy
which is error-weighted, but there would ahve to be errors recorded or
supplied by the VO when a catalogue was ingested.
Thus other parts of the VO e.g. supplying algorithms or constructing a
workflow would send requests to the Registry and include 'existance of
errors in x' or 'error_x < dx' as a selection criterion.

cheers

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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From: "Wil O'Mullane" <womullan@skysrv.pha.jhu.edu>
To: Anita Richards <amsr@jb.man.ac.uk>
Cc: registry@ivoa.net
Subject: Re: policy issues
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Following some discussions on accuracy ...
Perhaps we should include an accuracy with the UCD in the ucd list for a service. This would allow for searches with a given accuracy in any UCD.
Ray can you add that to the prototype Schema ?


wil

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To: "Wil O'Mullane" <womullan@skysrv.pha.jhu.edu>
Cc: <registry@ivoa.net>
References: <Pine.LNX.4.53.0304131615100.28204@aife.jb.man.ac.uk> <Pine.LNX.4.53.0304131620540.28204@aife.jb.man.ac.uk> <20030414090914.A12018@skysrv.pha.jhu.edu>
Subject: Re: policy issues
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Status:   

Wil

Accuracy of what? Clearly you have some context in mind, you are working to
describe some class of entity, and make those descriptions available through
the registry.

But perhaps the right solution here is not to tailor the generic VOResource
schema so that it can describe the class that you are thinking of. Perhaps
the right thing to do is to make a specific schema to describe whatever it
is you are putting in your collection.

Suppose I want to make a collection of VO resources that cover neutrino
astronomy. Should I also write to Ray asking that "neutrinoType" be added to
the VOResource schema, so that I can search on it? No. What I should do is
to work with other neutrino people, make a schema that describes the
neutrino astronomy part of the resource, and get it approved by the VO
committees.

Now, when I browse the registry, it will tell me that (at least) two
metadata descriptions are available -- both the generic VOResource and also
the VOneutrino schema. I can then choose to see the entitiy in either the
general or the specific way.

Just my $0.02
Roy


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

----- Original Message -----
From: "Wil O'Mullane" <womullan@skysrv.pha.jhu.edu>
To: "Anita Richards" <amsr@jb.man.ac.uk>
Cc: <registry@ivoa.net>
Sent: Monday, April 14, 2003 6:09 AM
Subject: Re: policy issues


>
> Following some discussions on accuracy ...
> Perhaps we should include an accuracy with the UCD in the ucd list for a
service. This would allow for searches with a given accuracy in any UCD.
> Ray can you add that to the prototype Schema ?
>
>
> wil
>

From - Mon Apr 14 17:55:30 2003
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Date: Mon, 14 Apr 2003 10:49:47 -0500 (CDT)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: registry@ivoa.net
Subject: RWP03: Metadata Info on Twiki
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Hi RWP03ers,

If you've been to the Registry WG Twiki lately, then you may have noticed 
the links to individual work package pages.  I want to call your attention 
to the page for RWP03, Metadata specs, and call for your comment and 
additions.  

First, as part of a first action item assigned to us at the kick-off 
meeting, I wrote a statement of scope.  It's not long, so when you get a 
chance please give it a read and make comments or suggestions.  This is to 
clarify what we plan to do and not do.

Second, I've added some material from the NVO effort to the Resources and 
Background.  Please add to this from your respective projects.  In 
particular, perhaps Elizabeth could post any additional information about 
work on registries (e.g. the XSD/DTD used in prototype).  

Finally, I've created a section for placing specifications to be 
discussed.  I plan to place a version of the VOResource XSD from the NVO 
there in the next day or two after I firm up some things.  Team members 
should feel free to add their own suggestions as well.

Note that the update alerting doesn't always seem to work for this twiki
(at least for me), so if you would like people to respond to what you've 
put there be sure to ping the registry mailling list.  In general, it's 
probably best we put our general discussion to that list, using the RWP03 
page as a reference warehouse.  (suggestions here?)

cheers,
Ray Plante




From - Tue Apr 15 12:40:31 2003
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Date: Tue, 15 Apr 2003 11:26:20 +0100 (BST)
From: Elizabeth Auden <eca@mssl.ucl.ac.uk>
To: Anita Richards <amsr@jb.man.ac.uk>
cc: <registry@ivoa.net>
Subject: Re: Review of VO science Cases in relation to Registries
In-Reply-To: <Pine.LNX.4.53.0304131615100.28204@aife.jb.man.ac.uk>
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Hi,

> >From an AstroGrid point of view we should also be developing Solar and
> Solar/STP cases?  And it might be useful to work on something which will
> be relevant to the IAU demo ie the LSB galaxies one... maybe Elizabeth and
> Mark can decide if that would be useful to the AVOA group of if we should
> start just inside AstroGrid at the appropriate time.

Good idea - I'll look at the Solar Coronal Waves and Solar STP Event
Coincidence AG sci problems and their registry requirements so that IVOA
will have some solar / STP representation.

cheers,
Elizabeth


From - Mon Apr 14 18:50:30 2003
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Date: Mon, 14 Apr 2003 11:44:12 -0500 (CDT)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: registry@ivoa.net
Subject: Re: RWP03: Metadata Info on Twiki
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On Mon, 14 Apr 2003, Ray Plante wrote:
> Note that the update alerting doesn't always seem to work for this twiki
> (at least for me), so if you would like people to respond to what you've 
> put there be sure to ping the registry mailling list.  

Thanks to Marcus, I discovered my mistake.  I would recommend WG members 
sign up for automated notifications of updates to the IVOA Twiki pages.  
This can be done via 

  http://www.ivoa.net/twiki/bin/view/IVOA/WebNotify

cheers,
Ray


From - Wed Apr 16 17:35:33 2003
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Date: Wed, 16 Apr 2003 17:31:10 +0200
From: Markus Dolensky <Markus.Dolensky@eso.org>
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To: Elizabeth Auden <eca@mssl.ucl.ac.uk>
CC: registry@ivoa.net
Subject: Re: lifetime of standards
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Hi Elizabeth,

you may want to address questions about IVOA and the standardization 
procedure to

Bob Hanisch, hanisch@stsci.edu, Chair
Peter Quinn, pjq@eso.org, Co-Chair
Nic Walton, naw@ast.cam.ac.uk, Secretary

I think there is a paper being drafted at the moment that explains the 
role of IVOA in more detail.

Markus



Elizabeth Auden wrote:
> Hello,
> 
> I was asked a few questions that I couldn't answer today:
> 
> 1. Once IVOA releases standards this December for the registry and other
> workgroups, will anyone maintain them after December 31st?
> 
> 2. How long will IVOA as an entity exist?
> 
> 3. Depending on the answers to 1 and 2, could maintenance of standards be
> passed to another, longer term group (such as W3, IEEE, or GGF)?
> 
> Does anyone have any ideas? People at MSSL are thinking about the PPARC
> announcement of $$$ for generation 2 UK grid proposals due at the end of
> May. They're asking how they can "grid-enable" (and they always make
> finger quote gestures at this point) various data archives and data
> processing software.
> 
> Something to mull over while eating chocolate bunnies this weekend, I
> think.  If you have Friday and Monday off, have a great holiday weekend.
> 
> 
> cheers,
> Elizabeth

From - Wed Apr 16 16:20:34 2003
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Date: Wed, 16 Apr 2003 15:02:39 +0100 (BST)
From: Elizabeth Auden <eca@mssl.ucl.ac.uk>
To: <registry@ivoa.net>
Subject: lifetime of standards
In-Reply-To: <002401c30021$fcc49bd0$18875c0c@stsci.edu>
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Hello,

I was asked a few questions that I couldn't answer today:

1. Once IVOA releases standards this December for the registry and other
workgroups, will anyone maintain them after December 31st?

2. How long will IVOA as an entity exist?

3. Depending on the answers to 1 and 2, could maintenance of standards be
passed to another, longer term group (such as W3, IEEE, or GGF)?

Does anyone have any ideas? People at MSSL are thinking about the PPARC
announcement of $$$ for generation 2 UK grid proposals due at the end of
May. They're asking how they can "grid-enable" (and they always make
finger quote gestures at this point) various data archives and data
processing software.

Something to mull over while eating chocolate bunnies this weekend, I
think.  If you have Friday and Monday off, have a great holiday weekend.


cheers,
Elizabeth







From - Wed Apr 16 17:05:33 2003
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Subject: Registry Work Package 4
From: Keith Noddle <ktn@star.le.ac.uk>
To: IVOA Registry mailing list <registry@ivoa.net>
Content-Type: text/plain
Organization: 
Message-Id: <1050504965.4013.21.camel@rocky.star.le.ac.uk>
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Status:   

Slightly belatedly (I hate it when the day job gets in the way...) I
have opened the IVOA Wiki page for Registry Work Package 4.

The primary purpose of this WP is to design a mechanism whereby registry
data may be distributed (where "distributed" is still to be defined) and
a query schema which defines how registries will be interrogated.

In order to stimulate ideas I'd like to ask the assembled company for
their thoughts and experiences on the following:

     1. Are there any precedents or examples of sharing registry style
        data already in existence?
     2. What ideas for sharing data do people have?
     3. What are the "Must Haves" and "Must Nots"?
     4. Are there any good examples of metadata querying that we should
        adopt?

I am very interested in any views regarding sharing registry data in a
network DNS fashion versus replicating data among a peer group of
registries.

Keith.

-- 

Keith Noddle			Phone:  +44 (0)116 223 1894
AstroGrid Technical Lead	Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy	Mobile: +44 (0)7721 926 461
University of Leicester		Email:  ktn@star.le.ac.uk
Leicester, UK   LE1 7RH		Web:    http://www.astrogrid.org

From - Wed Apr 16 20:30:34 2003
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Reply-To: "Robert Hanisch" <hanisch@stsci.edu>
From: "Robert Hanisch" <rjhanisch@worldnet.att.net>
To: "Elizabeth Auden" <eca@mssl.ucl.ac.uk>, <registry@ivoa.net>
References: <Pine.OSF.4.33.0304161454160.1443617-100000@msslai.mssl.ucl.ac.uk>
Subject: Re: lifetime of standards
Date: Wed, 16 Apr 2003 14:26:08 -0400
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> I was asked a few questions that I couldn't answer today:
Who's asking...?
>
> 1. Once IVOA releases standards this December for the registry and other
> workgroups, will anyone maintain them after December 31st?
>
> 2. How long will IVOA as an entity exist?
>
> 3. Depending on the answers to 1 and 2, could maintenance of standards be
> passed to another, longer term group (such as W3, IEEE, or GGF)?
I think the answers to 1, 2, and 3 all lie in creating a VO oversight body
within other long-lived organizations, such as the IAU.  In fact with this
summer's IAU General Assembly, we will be creating a working group in
Commission 5 (Astronomical Data) to deal with VO.  The idea is to have a
situation somewhat similar to that for the FITS standard (though with a more
flexible review process), in which we have both national and international
committees whose job it is to maintain the standard.

This somewhat begs the issue of what the VO will look like in a few years.
On the east side of the Atlantic things are moving toward Euro-VO, and over
here things are still unsettled as to how NSF and NASA ultimately come to
terms with an operating VO, as opposed to short-term development projects.
It is looking somewhat optimistic, however, that NASA will begin supporting
development complementary to the NSF-funded NVO project next year.  So, to
answer question 2 more explicitly, I think as long as we have national
projects and are willing to work together to build common standards, we will
have an IVOA.

Cheers,
Bob

From - Wed Apr 16 22:30:34 2003
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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: "'Robert Hanisch'" <hanisch@stsci.edu>,
   "'Elizabeth Auden'" <eca@mssl.ucl.ac.uk>, <registry@ivoa.net>
Subject: RE: lifetime of standards
Date: Wed, 16 Apr 2003 21:27:40 +0100
Organization: University of Leicester
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> as long as ... we will have an IVOA, Virginia.

:)

> -----Original Message-----
> From: Robert Hanisch [mailto:rjhanisch@worldnet.att.net] 
> Sent: 16 April 2003 19:26
> To: Elizabeth Auden; registry@ivoa.net
> Subject: Re: lifetime of standards
> 
> 
> > I was asked a few questions that I couldn't answer today:
> Who's asking...?
> >
> > 1. Once IVOA releases standards this December for the registry and 
> > other workgroups, will anyone maintain them after December 31st?
> >
> > 2. How long will IVOA as an entity exist?
> >
> > 3. Depending on the answers to 1 and 2, could maintenance 
> of standards 
> > be passed to another, longer term group (such as W3, IEEE, or GGF)?
> I think the answers to 1, 2, and 3 all lie in creating a VO 
> oversight body within other long-lived organizations, such as 
> the IAU.  In fact with this summer's IAU General Assembly, we 
> will be creating a working group in Commission 5 
> (Astronomical Data) to deal with VO.  The idea is to have a 
> situation somewhat similar to that for the FITS standard 
> (though with a more flexible review process), in which we 
> have both national and international committees whose job it 
> is to maintain the standard.
> 
> This somewhat begs the issue of what the VO will look like in 
> a few years. On the east side of the Atlantic things are 
> moving toward Euro-VO, and over here things are still 
> unsettled as to how NSF and NASA ultimately come to terms 
> with an operating VO, as opposed to short-term development 
> projects. It is looking somewhat optimistic, however, that 
> NASA will begin supporting development complementary to the 
> NSF-funded NVO project next year.  So, to answer question 2 
> more explicitly, I think as long as we have national projects 
> and are willing to work together to build common standards, 
> we will have an IVOA.
> 
> Cheers,
> Bob
> 

From - Wed Apr 16 22:30:34 2003
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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: <registry@ivoa.net>
Subject: RE: lifetime of standards
Date: Wed, 16 Apr 2003 21:28:03 +0100
Organization: University of Leicester
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Status:   

More sensible reply...

> This somewhat begs the issue of what the VO will look like in 
> a few years. 

I hope that in a few years (probably more than a few), there won't be a VO.
It'll be a fading memory. Some geeks will still insist that the standards
are important but no-one will pay much attention to them (except the
software developers who will obey the standards almost without thinking).
Astronomers will use the tools available to run data reduction, analysis,
visualisation etc without ever wondering where the tools or data are
located. 

The infrastructure that we're creating will simply exist and people will get
on with the science without thinking about what makes it possible (I neither
know nor care how tcp/ip or the other gubbins of the internet works).

Guys like me who aren't astronomers will be working on holographic
visualisation (or still trying to get ontologies to work :) ).

Cheers,
Tony. 

> -----Original Message-----
> From: Robert Hanisch [mailto:rjhanisch@worldnet.att.net] 
> Sent: 16 April 2003 19:26
> To: Elizabeth Auden; registry@ivoa.net
> Subject: Re: lifetime of standards
> 
> 
> > I was asked a few questions that I couldn't answer today:
> Who's asking...?
> >
> > 1. Once IVOA releases standards this December for the registry and 
> > other workgroups, will anyone maintain them after December 31st?
> >
> > 2. How long will IVOA as an entity exist?
> >
> > 3. Depending on the answers to 1 and 2, could maintenance 
> of standards 
> > be passed to another, longer term group (such as W3, IEEE, or GGF)?
> I think the answers to 1, 2, and 3 all lie in creating a VO 
> oversight body within other long-lived organizations, such as 
> the IAU.  In fact with this summer's IAU General Assembly, we 
> will be creating a working group in Commission 5 
> (Astronomical Data) to deal with VO.  The idea is to have a 
> situation somewhat similar to that for the FITS standard 
> (though with a more flexible review process), in which we 
> have both national and international committees whose job it 
> is to maintain the standard.
> 
> This somewhat begs the issue of what the VO will look like in 
> a few years. On the east side of the Atlantic things are 
> moving toward Euro-VO, and over here things are still 
> unsettled as to how NSF and NASA ultimately come to terms 
> with an operating VO, as opposed to short-term development 
> projects. It is looking somewhat optimistic, however, that 
> NASA will begin supporting development complementary to the 
> NSF-funded NVO project next year.  So, to answer question 2 
> more explicitly, I think as long as we have national projects 
> and are willing to work together to build common standards, 
> we will have an IVOA.
> 
> Cheers,
> Bob
> 


From - Wed Apr 23 10:27:26 2003
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Date: Tue, 22 Apr 2003 14:16:01 -0500 (CDT)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: registry@ivoa.net
Subject: RWP03: XML Resource Metadata 
Message-ID: <Pine.LNX.4.44.0304221342550.3659-100000@poplar.ncsa.uiuc.edu>
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WP3ers,

In response to one of our early action items, I have posted to the WP03
page (http://www.ivoa.net/twiki/bin/view/IVOA/IVOARegWp03) under the
Specifications section a version 0.1 XML Schema for Resource Metadata.  
To help folks interpret the schema documents, I prepared an overview
document
(http://www.ivoa.net/internal/IVOA/IVOARegWp03/MDinXML-Summary.html) that
includes some helpful XMLSpy diagrams.  I would appreciate any and all
comments.

Note that this specification need not be the only one we have on the block 
for discussion.  If there are other schemas you would like us to discuss, 
please post them as well.

cheers,
Ray


From - Wed Apr 23 20:50:23 2003
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Date: Wed, 23 Apr 2003 19:50:23 +0100 (BST)
From: Anita Richards <amsr@jb.man.ac.uk>
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Status:   



Background notes on how (extra-solar) astronomers use frequency/wavelength

Non-astronomers might find some notes I made for the AstroGrid
Registry and metadata discussion helpful:

http://wiki.astrogrid.org/bin/view/Astrogrid/AstronomicalFrequency

- I also include some references and definitions

This  goes into levels of complexity which we will not need to worry about
in the Registry, but we will when answering queries.

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: RWP04: Registry Replication
From: Keith Noddle <ktn@star.le.ac.uk>
To: IVOA Registry mailing list <registry@ivoa.net>
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In order to make a start on the design of registry replication, I have
put together the following requirements and their implications. Please
feel free to alter, add or delete. I'll assume silence to mean
approval...

1. Distributed
      * It probably doesn't make sense to store all of the registry data
        in every registry. This implies a distributed model of registry
        searching and maintenance.

2. Self maintaining
      * The registries should place the absolute minimum burden upon the
        data centres where they run. On-going maintenance costs are
        mostly those relating to support personnel, so the less human
        intervention the better.
      * Registries should where possible manage their own data integrity
        (backups etc)
      * Self maintenance almost certainly implies a peer network of
        registries.

3. Extensible
      * It must be easy to add a new registry to the registry network
        (but see below).
      * It should also be a design goal to make changes to the registry
        metadata design relatively painless.

4. Robust
      * The registry network should continue working even when some
        registries are not available. This implies a certain level of
        data redundancy.
      * Registries will be visible to the Internet. They must therefore
        provide sufficient security to protect the integrity of their
        data (see also Self Maintaining) without hindering access to
        those data.
      * Registries must also resist other forms of attack for example
        "Denial of Service" attacks or providing a host for "Man in the
        Middle" attacks.

5. Reliable
      * Users should be confident that the queries they issue to
        registries will return valid, useful data. It is therefore
        important to manage the membership of the "registry club" and
        not let arbitrary registries join the network unchecked.
        
6. Flexible
      * Registries should support rich data enquiries.
      * A registry should also support "data harvesting" by other
        registries. This allows registry data to be copied and expanded
        as required as well as supporting data redundancy through data
        replication.

Based upon this list I have started to develop use cases, activity
diagrams and a domain model to support these operations.

Please note I have NOT started work on the registry query schema as I
need help on this one!

Keith.

-- 

Keith Noddle			Phone:  +44 (0)116 223 1894
AstroGrid Technical Lead	Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy	Mobile: +44 (0)7721 926 461
University of Leicester		Email:  ktn@star.le.ac.uk
Leicester, UK   LE1 7RH		Web:    http://www.astrogrid.org

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Subject: [Fwd: Re: RWP04: Registry Replication]
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Following my "Requirements" email this morning, Wil and I have had an
unintentionally private email conversation which is attached in it's
unedited glory...

Keith.

-- 

Keith Noddle			Phone:  +44 (0)116 223 1894
AstroGrid Technical Lead	Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy	Mobile: +44 (0)7721 926 461
University of Leicester		Email:  ktn@star.le.ac.uk
Leicester, UK   LE1 7RH		Web:    http://www.astrogrid.org

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From: "Wil O'Mullane" <womullan@skysrv.pha.jhu.edu>
To: Keith Noddle <ktn@star.le.ac.uk>
Subject: Re: RWP04: Registry Replication
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> 1. Distributed
>       * It probably doesn't make sense to store all of the registry data
>         in every registry. This implies a distributed model of registry
>         searching and maintenance.
This sort of contradicts what you say below about data redundancy - are we having some data redundancy ? I would argue the registries are small we should have complete redundancy in at least some registries and that these are the ones people go to search. Hence there would be a line between Publishing Registries and Searchable registries. This gives robustness and a certain gaurantee of query integrity across copies.... (4, 5)


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From: "Wil O'Mullane" <womullan@skysrv.pha.jhu.edu>
To: Keith Noddle <ktn@star.le.ac.uk>
Subject: Re: RWP04: Registry Replication
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sure repost them - sorry I didi not do grpup reply ..
On Thu, Apr 24, 2003 at 04:22:20PM +0100, Keith Noddle wrote:
> > Surely a user fo a registry just wants to search - he should not see
> > this
> > detail of implementation.
> > Hence we need only 
> >  1. Search the selected registry
> Absolutely, that should be the default behaviour. I may be wrong, but I
> get the impression that some astronomers want simple tools whilst others
> want to know exactly what is being done and have control over the
> process. Hence my suggestion that we support more complex search types,
> like the www.google.com advanced search page, perhaps.
> 
> > It would be nice if we had fail over though which caused the next reg
> > to be searched if the selected one failed.
> I agree. We do need to define "fail" however. Is it the absence of the
> registry, lack of data within that registry ... ? If the latter, how far
> do we expect the registry to spread the search on behalf of the user? To
> which registries? Again I had in mind a simple default behaviour and an
> advanced page for those who wish to delve.
> 
> I really appreciate the time you are putting into this. Should we open
> these emails up to the wider mailing list?
> 
> Keith.
> 
> -- 
> 
> Keith Noddle			Phone:  +44 (0)116 223 1894
> AstroGrid Technical Lead	Fax:    +44 (0)116 252 3311
> Dept of Physics & Astronomy	Mobile: +44 (0)7721 926 461
> University of Leicester		Email:  ktn@star.le.ac.uk
> Leicester, UK   LE1 7RH		Web:    http://www.astrogrid.org

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Subject: Re: RWP04: Registry Replication
From: Keith Noddle <ktn@star.le.ac.uk>
To: Wil O'Mullane <womullan@skysrv.pha.jhu.edu>
In-Reply-To: <20030424093600.A19531@skysrv.pha.jhu.edu>
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On Thu, 2003-04-24 at 14:36, Wil O'Mullane wrote:
> > 1. Distributed
> >       * It probably doesn't make sense to store all of the registry data
> >         in every registry. This implies a distributed model of registry
> >         searching and maintenance.
> This sort of contradicts what you say below about data redundancy -
> are we having some data redundancy ? I would argue the registries are
> small we should have complete redundancy in at least some registries
> and that these are the ones people go to search. Hence there would be
> a line between Publishing Registries and Searchable registries. This
> gives robustness and a certain gaurantee of query integrity across
> copies.... (4, 5)
Apologies if I didn't make this clear: I'm advocating some duplication -
enough to provide fail over if a registry becomes unavailable, but not
complete copies of everything everywhere. Thus all data in one registry
should be available from a different registry (or registries) i.e. at
least one full copy held somewhere else. Thus we will need to support
the concept of "master" entries (records) with mirrors. For performance
and resource usage reasons, we will also probably have to support cached
entries in the DNS style.

I'm very keen to avoid any actual or implied hierarchy of registry
servers as a hierarchical organisation tends to require "management" -
and hence cost. By design, it should be irrelevant to the user which
registry is used. If the "local" registry doesn't have some or all of
the information required it (not necessarily the user) will be able to
search other registries on behalf of the user. In the "peer registry
network" scheme, registries can be as large or small as required and
still be able to access all information in the registry network. Having
said all that, the user should be able to chose which registry is used
and how deep the search is allowed to go before terminating. Thus in a
single operation it should be possible to:

1. search only the selected registry or
2. search all registries in the registry network or
3. some subset of the above

How does that sound?

Keith.

-- 

Keith Noddle			Phone:  +44 (0)116 223 1894
AstroGrid Technical Lead	Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy	Mobile: +44 (0)7721 926 461
University of Leicester		Email:  ktn@star.le.ac.uk
Leicester, UK   LE1 7RH		Web:    http://www.astrogrid.org

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Subject: Re: RWP04: Registry Replication
From: Keith Noddle <ktn@star.le.ac.uk>
To: Wil O'Mullane <womullan@skysrv.pha.jhu.edu>
In-Reply-To: <20030424111226.B19931@skysrv.pha.jhu.edu>
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> Surely a user fo a registry just wants to search - he should not see
> this
> detail of implementation.
> Hence we need only 
>  1. Search the selected registry
Absolutely, that should be the default behaviour. I may be wrong, but I
get the impression that some astronomers want simple tools whilst others
want to know exactly what is being done and have control over the
process. Hence my suggestion that we support more complex search types,
like the www.google.com advanced search page, perhaps.

> It would be nice if we had fail over though which caused the next reg
> to be searched if the selected one failed.
I agree. We do need to define "fail" however. Is it the absence of the
registry, lack of data within that registry ... ? If the latter, how far
do we expect the registry to spread the search on behalf of the user? To
which registries? Again I had in mind a simple default behaviour and an
advanced page for those who wish to delve.

I really appreciate the time you are putting into this. Should we open
these emails up to the wider mailing list?

Keith.

-- 

Keith Noddle			Phone:  +44 (0)116 223 1894
AstroGrid Technical Lead	Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy	Mobile: +44 (0)7721 926 461
University of Leicester		Email:  ktn@star.le.ac.uk
Leicester, UK   LE1 7RH		Web:    http://www.astrogrid.org

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From: "Wil O'Mullane" <womullan@skysrv.pha.jhu.edu>
To: Keith Noddle <ktn@star.le.ac.uk>
Subject: Re: RWP04: Registry Replication
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> 
> 1. search only the selected registry or
> 2. search all registries in the registry network or
> 3. some subset of the above
> 
Surely a user fo a registry just wants to search - he should not see this
detail of implementation.
Hence we need only 
 1. Search the selected registry

It would be nice if we had fail over though which caused the next reg to be searched if the selected one failed.

wil

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Subject: Re: RWP04: Registry Replication
From: Keith Noddle <ktn@star.le.ac.uk>
To: "Wil O'Mullane" <womullan@skysrv.pha.jhu.edu>
Cc: IVOA Registry mailing list <registry@ivoa.net>
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On Thu, 2003-04-24 at 17:18, Wil O'Mullane wrote:
> On Thu, Apr 24, 2003 at 04:22:20PM +0100, Keith Noddle wrote:
> > > Surely a user fo a registry just wants to search - he should not see
> > > this
> > > detail of implementation.
> > > Hence we need only 
> > >  1. Search the selected registry
> > Absolutely, that should be the default behaviour. I may be wrong, but I
> > get the impression that some astronomers want simple tools whilst others
> > want to know exactly what is being done and have control over the
> > process. Hence my suggestion that we support more complex search types,
> > like the www.google.com advanced search page, perhaps.
> This is true for image/data processing - not for registry searching I would say
If we adopt a distributed model we probably want to provide control over
the searching at some level, but see below...
>  
> 
> > 
> > > It would be nice if we had fail over though which caused the next reg
> > > to be searched if the selected one failed.
> > I agree. We do need to define "fail" however. Is it the absence of the
> > registry, lack of data within that registry ... ? If the latter, how far
> > do we expect the registry to spread the search on behalf of the user? To
> > which registries? Again I had in mind a simple default behaviour and an
> > advanced page for those who wish to delve.
> I still maintain registry where people search should probably be complete i.e. 
> they should harvest data from other registries to keep themselves complete.
> A search in a registry is then in a registry and never goes anywhere else.
So the registries would organise themselves in a Microsoft Primary
Domain Controller / Secondary Domain Controller(s) fashion? All data
held in a few central places with full fail over should the local
"primary" fail? That would work - would the data centres hosting the
primaries be up for the data and network volumes? Probably not too
excessive although we need to be sure as the primary / secondary scheme
is not truly scalable...

Keith.

-- 

Keith Noddle			Phone:  +44 (0)116 223 1894
AstroGrid Technical Lead	Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy	Mobile: +44 (0)7721 926 461
University of Leicester		Email:  ktn@star.le.ac.uk
Leicester, UK   LE1 7RH		Web:    http://www.astrogrid.org

From - Thu Apr 24 19:31:22 2003
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From: "Wil O'Mullane" <womullan@skysrv.pha.jhu.edu>
To: Keith Noddle <ktn@star.le.ac.uk>
Cc: IVOA Registry mailing list <registry@ivoa.net>
Subject: Re: RWP04: Registry Replication
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References: <1051178338.1047.75.camel@rocky.star.le.ac.uk> <20030424093600.A19531@skysrv.pha.jhu.edu> <1051193022.1047.106.camel@rocky.star.le.ac.uk> <20030424111226.B19931@skysrv.pha.jhu.edu> <1051197740.1047.118.camel@rocky.star.le.ac.uk> <20030424121836.C22084@skysrv.pha.jhu.edu> <1051201765.1047.147.camel@rocky.star.le.ac.uk>
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> So the registries would organise themselves in a Microsoft Primary
> Domain Controller / Secondary Domain Controller(s) fashion? All data
> held in a few central places with full fail over should the local
> "primary" fail? That would work - would the data centres hosting the
> primaries be up for the data and network volumes? Probably not too
> excessive although we need to be sure as the primary / secondary scheme
> is not truly scalable...

I was not thinkning interms of the MS model but effectivly it is similar. Why not have smoething simpler until we need something more complex - distribution is a difficult problem and not wholy necessary to solve this problem.


From - Thu Apr 24 22:11:21 2003
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Date: Thu, 24 Apr 2003 22:08:17 +0200
Subject: Re: Document layout & process
From: Peter Quinn <pjq@eso.org>
To: <ael@star.le.ac.uk>, "'IVOA Exec'" <ivoa@ivoa.net>, <registry@ivoa.net>
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Thanks Tony!

  I'll try to review these in detail over the weekend but looks to be the
right direction to go at this time...

    Peter


On 24/4/03 9:54 PM, "Tony Linde" <ael@star.le.ac.uk> wrote:

> I've finally got around to coming up with a document layout as promised to
> the Registry Working Group.
> 
> However, what I've put together (or hacked together) is a process and layout
> that I think the IVOA should adopt for all its publications, so I'm copying
> this to the exec mailing list as well.
> 
> I started out trying to adapt the GGF document process and layout but ended
> up twisting my brain inside out to get different types of document to fit
> all the category permutations. I gave up on the weekend and have gone with
> the W3C standards instead.
> 
> I've used the W3C 'Consortium Process Document':
> http://www.w3.org/Consortium/Process-20010719/process.html
> and have so far only adapted section 5, 'Technical Reports':
> http://www.w3.org/Consortium/Process-20010719/process.html#Reports
> 
> I think we also need section 8, 'Member Submission Process':
> http://www.w3.org/Consortium/Process-20010719/process.html#Submission
> but can debate how much of the rest of the document is needed.
> 
> I could not get at the document layout standards as they're in a
> 'members-only' area so I took one of the OWL documents, 'Web Ontology
> Language Reference':
> http://www.w3.org/TR/owl-ref/
> and adapted that to our needs. I've not written instructions, just knocked
> up a sample document but we can come up with proper layout instructions if
> people are happy with this example.
> 
> The attached zip file contains two html files:
> IVOA-Doc-Process.html
> WD-RegQueryLang-20030421.html
> and supporting css and image files.
> 
> The first is the process document and the second the sample layout. I've
> rewritten all of the process document, conflating five steps to three and
> cutting and revising other stuff but most of the sample is garbage with just
> enough headings and links to make it obvious what a real document should
> look like. There are probably still broken and inappropriate links in both -
> please ignore them.
> 
> The process document mentions a Technical Director (TD) and Technical
> Advisory Group (TAG). The TD fulfils the role of IVOA 'keeper of the
> architectural vision' as well as chief editor for all publications. The TAG
> is a review group for documents. I've deliberately not stated the
> composition of either the role or group - I'll look for suggestions from the
> Exec for that.
> 
> So, what do people think?
> 
> 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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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: "'IVOA Exec'" <ivoa@ivoa.net>, <registry@ivoa.net>
Subject: Document layout & process
Date: Thu, 24 Apr 2003 20:54:13 +0100
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I've finally got around to coming up with a document layout as promised =
to
the Registry Working Group.=20

However, what I've put together (or hacked together) is a process and =
layout
that I think the IVOA should adopt for all its publications, so I'm =
copying
this to the exec mailing list as well.

I started out trying to adapt the GGF document process and layout but =
ended
up twisting my brain inside out to get different types of document to =
fit
all the category permutations. I gave up on the weekend and have gone =
with
the W3C standards instead.

I've used the W3C 'Consortium Process Document':
  http://www.w3.org/Consortium/Process-20010719/process.html
and have so far only adapted section 5, 'Technical Reports':
  http://www.w3.org/Consortium/Process-20010719/process.html#Reports

I think we also need section 8, 'Member Submission Process':
  http://www.w3.org/Consortium/Process-20010719/process.html#Submission
but can debate how much of the rest of the document is needed.

I could not get at the document layout standards as they're in a
'members-only' area so I took one of the OWL documents, 'Web Ontology
Language Reference':
  http://www.w3.org/TR/owl-ref/
and adapted that to our needs. I've not written instructions, just =
knocked
up a sample document but we can come up with proper layout instructions =
if
people are happy with this example.

The attached zip file contains two html files:
  IVOA-Doc-Process.html
  WD-RegQueryLang-20030421.html
and supporting css and image files.

The first is the process document and the second the sample layout. I've
rewritten all of the process document, conflating five steps to three =
and
cutting and revising other stuff but most of the sample is garbage with =
just
enough headings and links to make it obvious what a real document should
look like. There are probably still broken and inappropriate links in =
both -
please ignore them.

The process document mentions a Technical Director (TD) and Technical
Advisory Group (TAG). The TD fulfils the role of IVOA 'keeper of the
architectural vision' as well as chief editor for all publications. The =
TAG
is a review group for documents. I've deliberately not stated the
composition of either the role or group - I'll look for suggestions from =
the
Exec for that.

So, what do people think?

Cheers,
Tony.=20

__
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: "Tony Linde" <ael@star.le.ac.uk>
To: "'IVOA Exec'" <ivoa@ivoa.net>
Subject: Rwp01: Document layout & process
Date: Fri, 25 Apr 2003 11:57:36 +0100
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Whoops! Forgot that this should have had Rwp01 as subject prefix...

-----Original Message-----
From: Tony Linde [mailto:ael@star.le.ac.uk]=20
Sent: 24 April 2003 20:54
To: 'IVOA Exec'; registry@ivoa.net
Subject: Document layout & process


I've finally got around to coming up with a document layout as promised =
to
the Registry Working Group.=20

However, what I've put together (or hacked together) is a process and =
layout
that I think the IVOA should adopt for all its publications, so I'm =
copying
this to the exec mailing list as well.

I started out trying to adapt the GGF document process and layout but =
ended
up twisting my brain inside out to get different types of document to =
fit
all the category permutations. I gave up on the weekend and have gone =
with
the W3C standards instead.

I've used the W3C 'Consortium Process Document':
  http://www.w3.org/Consortium/Process-20010719/process.html
and have so far only adapted section 5, 'Technical Reports':
  http://www.w3.org/Consortium/Process-20010719/process.html#Reports

I think we also need section 8, 'Member Submission Process':
  http://www.w3.org/Consortium/Process-20010719/process.html#Submission
but can debate how much of the rest of the document is needed.

I could not get at the document layout standards as they're in a
'members-only' area so I took one of the OWL documents, 'Web Ontology
Language Reference':
  http://www.w3.org/TR/owl-ref/
and adapted that to our needs. I've not written instructions, just =
knocked
up a sample document but we can come up with proper layout instructions =
if
people are happy with this example.

The attached zip file contains two html files:
  IVOA-Doc-Process.html
  WD-RegQueryLang-20030421.html
and supporting css and image files.

The first is the process document and the second the sample layout. I've
rewritten all of the process document, conflating five steps to three =
and
cutting and revising other stuff but most of the sample is garbage with =
just
enough headings and links to make it obvious what a real document should
look like. There are probably still broken and inappropriate links in =
both -
please ignore them.

The process document mentions a Technical Director (TD) and Technical
Advisory Group (TAG). The TD fulfils the role of IVOA 'keeper of the
architectural vision' as well as chief editor for all publications. The =
TAG
is a review group for documents. I've deliberately not stated the
composition of either the role or group - I'll look for suggestions from =
the
Exec for that.

So, what do people think?

Cheers,
Tony.=20

__
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 - Fri Apr 25 18:44:46 2003
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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: "'IVOA Registry mailing list'" <registry@ivoa.net>
Subject: RE: RWP04: Registry Replication
Date: Fri, 25 Apr 2003 17:38:56 +0100
Organization: University of Leicester
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Status:   

I've looked over the exchange between Keith and Will about the registry
contents. 

If we go with Will's idea of every registry holding all information about
every VO resource then I think we need a second tier of registry - one which
only stores limited information, submits to harvesting or push-updates of
some kind but does not implement the query interface. These could be set up
by data centres to maintain their own list of resources which are then
replicated onto the main grid of full registries.

Personally, though, I prefer the approach of allowing intermediate
registries, those which might only harvest from a limited number of groups.
Such registries could offer fast responses to queries from a community which
was primarily interested in certain types of query. But such registries
would also have to cope with queries beyond their answering capability. 

What I would propose then is that the query have a structure like:

<query scope={"all","target","this"} expiry="date time">
  <originator type={"client","registry"}>
    ...
  </originator>
  <target>
    <registryID>
      ...
    </registryID>
    <registryID>
      ...
    </registryID>
    ...
  </target>
  <queryID>
    ...
  </queryID>
  ...actual query...
</query>

(ignore the actual tags - I'm not pre-empting the RegQL discussion)

So a client (portal usually) will submit a registry query and, usually, the
registry will satisfy it (scope="this"). The expiry attribute and the
originator and target tags are optional and ignored if they are included.

The queryID tag is an ID that the client has assigned and is not mandatory
on a local query.

If the client requires deeper scope, then the query becomes asynchronous.
The registry satisfies what it can of the query from its own list of
resources and returns this to the client. It then repackages the query and
redistributes it.

The redistributed query makes use of the expiry tag to indicate a cutoff
date/time beyond which any receiving registries can ignore the query and
delete it - if the client has not supplied this, the registry will add it
before distribution. The queryID tag is mandatory on these queries as is the
originator tag. 

The originator tag identifies where the answers are sent back to: either the
client or the local registry. We would need some means of returning the
answers to the client either way - call back, messaging interface or
whatever.

If the scope="target", the <target> structure identifies the destination
registry(ies). The only valid targets are ones the local registry knows the
address of (all of them if every registry is mandated to keep a full list of
all other registries). The local registry will look up the location and
calling mechanism for these registries and pass the query on to them. In
turn, they will satisfy the query and return the results to the indicated
originator.

The 'target' scope queries could be synchronous but mandating that means we
have to program around the problem of what happens if one or more of the
targets is offline. Easier, I think, to make it asynch in the first place so
the client knows it has to accumulate results.

If the originator was identified as the local registry, it could dedup the
returning results - only sending on resources not already found. And then
the client could poll the local registry for updates. Might be easier?

If scope="all", the registry sends the same query to all the registries on
the VO. So the effect is the same as for 'target' scope. If we do not
mandate that every registry must carry a list of every other registry then
we need some way to put the query onto the VO so that registries will pick
it up and answer it. I'm sure there are algorithms for this.

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

Actually, I've been talking myself out of this as I type. If a query is
scoped 'all' and there are a dozen or so 'full' registries in the VO, every
one of those will answer with the maximum result set - this will flood the
VO with redundant data. 

Unless there is some way of stopping answers that have already been
generated?

We could pass the results around so they are only ever added to but again
that is adding to network traffic unduly.

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

*FINAL suggestion!!

How about if we have three types of registry:

1. full: will attempt to maintain a full list of all resources on the VO

2. limited: lists only resources of interest to a specific community

3. private: only lists the resources at that location; not queryable

Type 1 and 2 registries must maintain a full list of all other registries on
the VO. 

A client or portal linked to a 'full' registry always gets back a full set
of results from any query. 

A 'limited' registry offers the query scopes("all","target","this") above
except that the 'all' scope is simply sent to one of the 'full' registries.
The queries can now be synchronous so we can lose the complexity of the
expiry attribute and originator tag (if a target is offline for a 'target'
scope query, it is missed out of the results and the client told of this).
The registry is responsible for deduping the results.

The 'private' registry is the data centre one mentioned above which is only
ever harvested by the other two types of registries and does not implement a
query interface.

If anyone has managed to get this far down, how does this sound?

Cheers,
Tony. 

> -----Original Message-----
> From: Keith Noddle [mailto:ktn@star.le.ac.uk] 
> Sent: 24 April 2003 10:59
> To: IVOA Registry mailing list
> Subject: RWP04: Registry Replication
> ...


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Date: Fri, 25 Apr 2003 17:57:13 +0100 (BST)
From: Elizabeth Auden <eca@mssl.ucl.ac.uk>
To: Tony Linde <ael@star.le.ac.uk>
cc: "'IVOA Registry mailing list'" <registry@ivoa.net>
Subject: RE: RWP04: Registry Replication
In-Reply-To: <00ef01c30b49$2a5fdeb0$cc24d28f@brolga>
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> How about if we have three types of registry:
>
> 1. full: will attempt to maintain a full list of all resources on the VO
> 2. limited: lists only resources of interest to a specific community
> 3. private: only lists the resources at that location; not queryable
>
> Type 1 and 2 registries must maintain a full list of all other registries on
> the VO.

<SNIP>

> If anyone has managed to get this far down, how does this sound?

Since one of the cardinal "Is it a grid?" tests is non-centralized
control, the full registries would have to be mirrored.  Any institution
taking on the responsbility for a mirrored full registry would need to
ensure they have the people, funds, storage space, and security against
illegitimate registry entries.  A network of limited registries sounds
less scary for upkeep, but, as Tony said, the full registries would reduce
the complexity of "all" type queries.  (I hope I didn't just repeat what's
already been said.)

cheers,
Elizabeth


From - Fri Apr 25 19:34:46 2003
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Message-ID: <06d201c30b50$ae967110$6b91d783@cacr.caltech.edu>
From: "Roy Williams" <roy@cacr.caltech.edu>
To: "Elizabeth Auden" <eca@mssl.ucl.ac.uk>, "Tony Linde" <ael@star.le.ac.uk>
Cc: "'IVOA Registry mailing list'" <registry@ivoa.net>
References: <Pine.OSF.4.33.0304251752090.1276174-100000@msslai.mssl.ucl.ac.uk>
Subject: Re: RWP04: Registry Replication
Date: Fri, 25 Apr 2003 10:32:44 -0700
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> > How about if we have three types of registry:
> >
> > 1. full: will attempt to maintain a full list of all resources on the VO
> > 2. limited: lists only resources of interest to a specific community
> > 3. private: only lists the resources at that location; not queryable

There is a smooth transition here to what we might call type 4: a service
that can describe itself, and therefore acts as a very limited sort of
registry with only one record in it.

Many service models have self-description. In the SOAP model, each service
is able to produce a metadata document about itself, the WSDL file. In the
SIAP protocol, there is a request FORMAT=METADATA that produces a
definition.

Therefore we can have a model where registry types 3, 2, 1 are connecting to
services and asking them to describe themselves. They cache these
description records. Harvesting a registry is just like asking a service for
its own description.

Roy

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

From - Fri Apr 25 21:34:46 2003
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Date: Fri, 25 Apr 2003 13:32:06 -0600
From: rjackson@nmcourts.com (Robert E. Jackson)
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To: "'IVOA Registry mailing list'" <registry@ivoa.net>
Subject: Hopefully this may be of some use
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 boundary="------------030708050009060805000604"
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This is a multi-part message in MIME format.
--------------030708050009060805000604
Content-Type: text/plain; charset=us-ascii; format=flowed
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I once worked on a project to make it easier to find which
Astronomical Telescope/Instrument is capable of obtaining
the data you wanted.

The basic notions are described in the attached DBI-VIEWGRAPH.PDF.

A possible schema description in the attached OBSERVATORY.HTML

A possible query interface is in the attached OBSERVATORY-QUERY.HTML

A possible way of making the approach scalable is described at:

     http://adass.org/adass/proceedings/adass94/jacksonr2.html

In any event, may there never be a cloudy night at the Virtual Observatory.


Bob Jackson

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--------------030708050009060805000604
Content-Type: text/html;
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Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
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<html>
<head>
<title> Report</title>
</head>

<body
  bgcolor="#c0c0c0"
  link="#0000ff"
  vlink="#8000ff"
  alink="#ff0080">
<basefont size=3>

<!-- Report Header --     >
<center><font size=5><strong>Report</strong> </font><br>
<font size=3><em>Generated at: Mon Jan 04, 1999<br>
 11:50:22 </em> </font><br>
</center>
<!-- End of Report Header --     >

<!-- Table of Contents --     >
<br>

<hr height=3 width="100%" >
<font size=4>TABLE OF CONTENTS </font><br>

<dl>
    <dt><a href="#report_body"> REPORT BODY</a>
    <dt><a href="#000000000000"> Data</a> package
    <dd><a href="#000000000005"> Observatory</a> class
    <dd><a href="#000000000007"> TAC</a> class
    <dd><a href="#000000000009"> Telescope</a> class
    <dd><a href="#00000000000b"> Location</a> class
    <dd><a href="#00000000000d"> Instrument</a> class
    <dd><a href="#00000000000f"> Mode</a> class
    <dd><a href="#000000000039"> Ground</a> class
    <dd><a href="#00000000003b"> Airborne</a> class
    <dd><a href="#00000000003d"> Earth Orbit</a> class
    <dd><a href="#00000000003f"> Solar Orbit</a> class
    <dd><a href="#00000000004a"> owner</a> class
    <dd><a href="#000000000056"> Available</a> class
    <dd><a href="#000000000080"> value-range</a> class
    <dd><a href="#000000000096"> single</a> class
    <dd><a href="#000000000098"> range</a> class
    <dt><a href="#summary"> SUMMARY</a>
</dl>

<hr height=3 width="100%" >

<!-- End of Table of Contents --     >

<!-- Body of The Complete Report --     >
<br>
<a name="report_body"> </a><font size=4>REPORT BODY </font>
<dl>
<a name="000000000000"> </a><br>
    <dt><font color="red"><strong><font size=+1><tt>package Data</tt> </font></strong></font>
<br>

<dl>
    <dt><a name="000000000005"> </a><tt><font size=+1><font color="blue"><strong> class Observatory</strong></font> </font></tt>

<dl>
    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>Administrative entity controlling one or more telescopes with one
or more tacs.</em>
</dl>

<dl>
<br>
    <dt><font face="helvetica"><strong>Attributes:</strong></font>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">id</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">string</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>contiguous characters uniquely identifying the
observatory</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">name</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">string</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>full name with spaces</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">url</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">url</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>url for top level page describing observatory</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">data-url</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">url</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>URL for toplevel data file or directory</em>

</dl>
</dl>
</dl>
</dl>
<br>

<dl>
    <dt><a name="000000000007"> </a><tt><font size=+1><font color="blue"><strong> class TAC</strong></font> </font></tt>

<dl>
    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>Time Allocation Committee or equivalent for telescope</em>
</dl>

<dl>
<br>
    <dt><font face="helvetica"><strong>Attributes:</strong></font>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">id</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">string</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>unique id, contiguous characters</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">name</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">string</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>long name</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">url</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">url</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>URL for documentation for TAC and process</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">current-deadline</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">date</font>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">next-deadline</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">date</font>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">constraints</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">string</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>limitations on who can apply</em>

</dl>
</dl>
</dl>
</dl>
<br>

<dl>
    <dt><a name="000000000009"> </a><tt><font size=+1><font color="blue"><strong> class Telescope</strong></font> </font></tt>

<dl>
    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>Telescope or set of telescopes which are scheduled
as a group</em>
</dl>

<dl>
<br>
    <dt><font face="helvetica"><strong>Attributes:</strong></font>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">id</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">string</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>unique name contiguous characters</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">name</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">string</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>long name</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">url</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">url</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>URL for documentation</em>

</dl>
</dl>
</dl>
</dl>
<br>

<dl>
    <dt><a name="00000000000b"> </a><tt><font size=+1><font color="blue"><strong> class Location</strong></font> </font></tt>

<dl>
    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>Where the telescope is located.
Could be shared across observatories.</em>
</dl>

<dl>
<br>
    <dt><font face="helvetica"><strong>Attributes:</strong></font>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">id</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">string</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>unique id, no whitespace, 
ideally should be globally unique and reused</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">name</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">string</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>descriptive name</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">feas-url</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">url</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>URL for text or tool describing what parts of the
sky are visible and when</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">backgnd-url</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">url</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>URL for text or tool describing the amounts and types
of sky background</em>

</dl>
</dl>
</dl>
</dl>
<br>

<dl>
    <dt><a name="00000000000d"> </a><tt><font size=+1><font color="blue"><strong> class Instrument</strong></font> </font></tt>

<dl>
    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>Instrument which is available for this telescope.
One instrument object for each telescope+instrument
combination</em>
</dl>

<dl>
<br>
    <dt><font face="helvetica"><strong>Attributes:</strong></font>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">id</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">string</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>unique id, no whitespace</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">name</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">string</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>long name</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">doc-url</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">url</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>URL for documentation</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">etc-url</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">url</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>URL for exposure time calculator</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">archive-url</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">url</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>URL for archive query for data taken with this instrument</em>

</dl>
</dl>
</dl>
</dl>
<br>

<dl>
    <dt><a name="00000000000f"> </a><tt><font size=+1><font color="blue"><strong> class Mode</strong></font> </font></tt>

<dl>
    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>The number of modes can be 1 or many depending on
the desired level of detail.  More detail means that
queries can be more precise</em>
</dl>

<dl>
<br>
    <dt><font face="helvetica"><strong>Attributes:</strong></font>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">id</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">string</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>unique id no whitespace</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">name</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">string</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>descriptive name</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">wavelength</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">value-range</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>central wavelength, usually the mean over wavelength</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">x-resolution</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">value-range</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>spatial resolution in x dimension
for spectra, x is parallel to dispersion
units of arcseconds</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">y-resolution</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">value-range</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>spatial resolution in y direction
for spectra, y is perpendicular to dispersion
units of arcseconds</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">wave-resolution</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">value-range</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>wavelength resolution
resolution is defined as TBD
units defined by wavelength-units property</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">time-resolution</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">value-range</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>time resolution
maximum value is same as maximum exposure time
units of seconds</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">x-range</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">value-range</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>spatial coverage in x direction
units of arcseconds</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">y-range</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">value-range</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>spatial coverage in y direction
units of arcseconds</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">wave-range</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">value-range</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>spectral coverage
units defined by wavelength-units</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">effective-area</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">value-range</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>efficiency, throughput measure, which is
independent of resolution
units of square meters</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">wavelength-units</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">string</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>from list of legal units
list is TBD</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">time-range</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">value-range</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>time range over which time-resolution can
be done.
Not sure if this is necessary</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">x-occult</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">value-range</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>occulting bar/spot size in x direction
units of arcseconds</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">y-occult</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">value-range</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>occulting bar/spot size in y direction
units of arcseconds</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">x-fill</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">value-range</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>for fiber fed spectra, the spatial coverage
is not complete
</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">y-fill</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">value-range</font>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">wave-fill</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">value-range</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>are there echelle'
the entire wavelength range?</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">polarization</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">string</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>linear, circular, whatever
default of ""</em>

</dl>
</dl>
</dl>
</dl>
<br>

<dl>
    <dt><a name="000000000039"> </a><tt><font size=+1><font color="blue"><strong> class Ground</strong></font> </font></tt>

<dl>
    <dt><strong><font face="helvetica">Superclasses:</font></strong>
    <dd>Public<a href="#00000000000b"> Data::Location</a>
</dl>

<dl>
<br>
    <dt><font face="helvetica"><strong>Attributes:</strong></font>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">latitude</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">float</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>degrees</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">longitude</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">float</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>degrees -180,360</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">elevation</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">float</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>meters</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">seeing</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">value-range</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>arcseconds</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">water-vapor</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">value-range</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>millimeters of Hg</em>

</dl>
</dl>
</dl>
</dl>
<br>

<dl>
    <dt><a name="00000000003b"> </a><tt><font size=+1><font color="blue"><strong> class Airborne</strong></font> </font></tt>

<dl>
    <dt><strong><font face="helvetica">Superclasses:</font></strong>
    <dd>Public<a href="#00000000000b"> Data::Location</a>
</dl>

<dl>
    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>Airborne or mobile telescope</em>
</dl>

<dl>
<br>
    <dt><font face="helvetica"><strong>Attributes:</strong></font>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">latitude</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">value-range</font>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">longitude</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">value-range</font>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">elevation</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">value-range</font>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">seeing</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">value-range</font>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">water-vapor</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">value-range</font>
</dl>
</dl>
</dl>
<br>

<dl>
    <dt><a name="00000000003d"> </a><tt><font size=+1><font color="blue"><strong> class Earth Orbit</strong></font> </font></tt>

<dl>
    <dt><strong><font face="helvetica">Superclasses:</font></strong>
    <dd>Public<a href="#00000000000b"> Data::Location</a>
</dl>

<dl>
<br>
    <dt><font face="helvetica"><strong>Attributes:</strong></font>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">apogee</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">float</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>kilometers</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">eccentricity</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">float</font>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">inclination</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">float</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>degrees</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">precession-period</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">float</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>days</em>

</dl>
</dl>
</dl>
</dl>
<br>

<dl>
    <dt><a name="00000000003f"> </a><tt><font size=+1><font color="blue"><strong> class Solar Orbit</strong></font> </font></tt>

<dl>
    <dt><strong><font face="helvetica">Superclasses:</font></strong>
    <dd>Public<a href="#00000000000b"> Data::Location</a>
</dl>

<dl>
    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>properties are TBD</em>
</dl>

<dl>
<br>
    <dt><font face="helvetica"><strong>Attributes:</strong></font>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">apohelion</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">float</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>units of AU</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">eccentricity</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">float</font>
</dl>
</dl>
</dl>
<br>

<dl>
    <dt><a name="00000000004a"> </a><tt><font size=+1><font color="blue"><strong> class owner</strong></font> </font></tt>

<dl>
    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>owner and maintainer of service or data</em>
</dl>

<dl>
<br>
    <dt><font face="helvetica"><strong>Attributes:</strong></font>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">name</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">string</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>full name of owner</em>

</dl>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">email</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">string</font>

<dl>
    <dd>    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>email address for owner</em>

</dl>
</dl>
</dl>
</dl>
<br>

<dl>
    <dt><a name="000000000056"> </a><tt><font size=+1><font color="blue"><strong> class Available</strong></font> </font></tt>

<dl>
    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>Time when available</em>
</dl>

<dl>
<br>
    <dt><font face="helvetica"><strong>Attributes:</strong></font>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">begin</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">date</font> = minus-infinity
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">end</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">date</font> = plus-infinity
</dl>
</dl>
</dl>
<br>

<dl>
    <dt><a name="000000000080"> </a><tt><font size=+1><font color="blue"><strong>abstract class value-range</strong></font> </font></tt>

<dl>
    <dt><font face="helvetica"><strong>Documentation:</strong></font>
    <dd><em>A kludge to deal with single valued slots and two valued slots.
Two values are maximum and minimum</em>
</dl>
</dl>
<br>

<dl>
    <dt><a name="000000000096"> </a><tt><font size=+1><font color="blue"><strong> class single</strong></font> </font></tt>

<dl>
    <dt><strong><font face="helvetica">Superclasses:</font></strong>
    <dd>Public<a href="#000000000080"> Data::value-range</a>
</dl>

<dl>
<br>
    <dt><font face="helvetica"><strong>Attributes:</strong></font>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">value</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">float</font>
</dl>
</dl>
</dl>
<br>

<dl>
    <dt><a name="000000000098"> </a><tt><font size=+1><font color="blue"><strong> class range</strong></font> </font></tt>

<dl>
    <dt><strong><font face="helvetica">Superclasses:</font></strong>
    <dd>Public<a href="#000000000080"> Data::value-range</a>
</dl>

<dl>
<br>
    <dt><font face="helvetica"><strong>Attributes:</strong></font>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">maximum</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">float</font>
</dl>

<dl>
    <dt><font color="#000000">Private</font>&nbsp;&nbsp;<strong><font face="courier"><font color="#8b008b">minimum</font></font></strong>&nbsp;&nbsp;:&nbsp;&nbsp;<font color="#000000">float</font>
</dl>
</dl>
</dl>
<br>
</dl>

<!-- End of Body of The Complete Report --     >

<!-- Summary --     >

<hr height=3 width="100%" >
<a name="summary"> </a>    <dt><font size=4>SUMMARY </font>
<tt>
<dl>
    <dd>Total packages reported: &nbsp;&nbsp;&nbsp;&nbsp;<font color="#8a2be2">1</font>
    <dd>Total classes reported: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font color="#8a2be2">15</font>
</dl>
</tt>
<hr height=3 width="100%" >

<!-- End of the Summary --     >

</body>
</html>
--------------030708050009060805000604
Content-Type: text/html;
 name="OBSERVATORY-QUERY.HTML"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
 filename="OBSERVATORY-QUERY.HTML"

<HTML>

<HEAD>
<TITLE>Observatory Tool Query Interface - Version 3</TITLE>
</HEAD>
<BODY>

<H1>Observatory Tool Query Interface - Version 3</H1>

<FORM METHOD="POST" ACTION="http://www.sogs.stsci.edu/cgi-bin/query-obstool.tcl">

<INPUT TYPE="submit" VALUE="Submit Query">
<INPUT TYPE="reset" VALUE="Reset Fields">

<TABLE rules="all" border="1">

<TR><TH colspan="4">Required For All

<TR>
<TH>
<TH>Minimum
<TH>Maximum
<TH>Comments

<TR>
<TH>Wavelength/Energy Units
<TD colspan="2"><SELECT NAME="waveunits">
<OPTION VALUE="gev"> gev
<OPTION VALUE="mev"> mev
<OPTION VALUE="kev"> kev
<OPTION VALUE="ev"> ev
<OPTION VALUE="nm" SELECTED> nanometers
<OPTION VALUE="mu"> microns
<OPTION VALUE="mm"> millimeters
<OPTION VALUE="m"> meters
<OPTION VALUE="hz"> hertz
<OPTION VALUE="khz"> kilohertz
<OPTION VALUE="mhz"> megahertz
<OPTION VALUE="ghz"> gigahertz
</SELECT>
<TD>

<TR>
<TH>Central Wavelength/Energy
<TD><INPUT TYPE="text" NAME="min-minwave" SIZE=7>
<TD><INPUT TYPE="text" NAME="max-maxwave" SIZE=7>
<TD>mean value

<TR>
<TH>Wavelength/Energy Resolution
<TD><INPUT TYPE="text" NAME="min-minwaveres" SIZE=7>
<TD><INPUT TYPE="text" NAME="max-maxwaveres" SIZE=7>
<TD>

<TR>
<TH>Spatial Resolution X-axis (arcseconds)
<TD><INPUT TYPE="text" NAME="min-xres" SIZE=7>
<TD><INPUT TYPE="text" NAME="max-xres" SIZE=7>
<TD>

<TR>
<TH>Spatial Resolution Y-axis (arcseconds)
<TD><INPUT TYPE="text" NAME="min-yres" SIZE=7>
<TD><INPUT TYPE="text" NAME="max-yres" SIZE=7>
<TD>

<TR>
<TH>Effective Area 
<TD><INPUT TYPE="text" NAME="min-minarea" SIZE=7>
<TD><INPUT TYPE="text" NAME="max-maxarea" SIZE=7>
<TD>Units = <SELECT NAME="areaunits">
<OPTION VALUE="squarecm" SELECTED> square centimeters
<OPTION VALUE="squarem"> square meters
</SELECT>

<TR>
<TH>Instrument Available (dd/mmm/yyyy)
<TD><INPUT TYPE="text" NAME="begin-date" SIZE=11>
<TD><INPUT TYPE="text" NAME="end-date" SIZE=11>
<TD>

<TR>
<TH colspan="4">Imaging

<TR>
<TH>
<TH>Minimum
<TH>Maximum
<TH>Comments

<TR>
<TH>X-Axis Full-Width (arcseconds)
<TD><INPUT TYPE="text" NAME="min-xwidth" SIZE=7>
<TD><INPUT TYPE="text" NAME="max-xwidth" SIZE=7>
<TD>

<TR>
<TH>Y-Axis Full-Width (arcseconds)
<TD><INPUT TYPE="text" NAME="min-ywidth" SIZE=7>
<TD><INPUT TYPE="text" NAME="max-ywidth" SIZE=7>
<TD>perpendicular to dispersion axis of spectrograph

<TR>
<TH colspan="4">Spectra

<TR>
<TH>
<TH>Minimum
<TH>Maximum
<TH>Comments

<TR>
<TH>Wavelength/Energy Full-Width
<TD><INPUT TYPE="text" NAME="min-minwavewidth" SIZE=7>
<TD><INPUT TYPE="text" NAME="max-maxwavewidth" SIZE=7>
<TD>of single exposure (units as above)

<TR>
<TH>Spatial Channels
<TD><INPUT TYPE="text" NAME="min-channels" SIZE=7>
<TD><INPUT TYPE="text" NAME="max-channels" SIZE=7>
<TD>simultaneous star-sky or fiber fed

<TR>
<TH>Spatial Coverage
<TD colspan="2"><SELECT NAME="sptype">
<OPTION VALUE="full" SELECTED> Full
<OPTION VALUE="obj"> Objective Grating/Prism
<OPTION VALUE="lrp"> Linear Ramp Filter
</SELECT>
<TD>

<TR>
<TH colspan="4">Time Resolved

<TR>
<TH>
<TH>Minimum
<TH>Maximum
<TH>Comments

<TR>
<TH>Time Resolution (seconds)
<TD><INPUT TYPE="text" NAME="min-timeres" SIZE=7>
<TD><INPUT TYPE="text" NAME="max-timeres" SIZE=7>
<TD>

<TR>
<TH>Time Duration (hours)
<TD><INPUT TYPE="text" NAME="min-timedur" SIZE=7>
<TD><INPUT TYPE="text" NAME="max-timedur" SIZE=7>
<TD>continuously sampled

<TR>
<TH colspan="4">Occulting Disk/Bar

<TR>
<TH>
<TH>Minimum
<TH>Maximum
<TH>Comments

<TR>
<TH>X-Axis Full-Width (arcseconds)
<TD><INPUT TYPE="text" NAME="min-xoccult" SIZE=7>
<TD><INPUT TYPE="text" NAME="max-xoccult" SIZE=7>
<TD>

<TR>
<TH>Y-Axis Full-Width (arcseconds)
<TD><INPUT TYPE="text" NAME="min-yoccult" SIZE=7>
<TD><INPUT TYPE="text" NAME="max-yoccult" SIZE=7>
<TD>

<TR>
<TH colspan="4">

<TR>
<TH>Polarization
<TD colspan="2"><SELECT NAME="poltype">
<OPTION VALUE="" SELECTED> None
<OPTION VALUE="linear"> Linear
<OPTION VALUE="circular"> Circular
<OPTION VALUE="both"> Both
</SELECT>
<TD>

<TR>
<TH colspan="4">Location Requirements:

<TR>
<TH>Observatory Name
<TD colspan="2"><SELECT MULTIPLE NAME="observatory">
<OPTION VALUE="all"> All Observatories
<OPTION VALUE="obs1"> Observatory1
<OPTION VALUE="obs2"> Observatory2
<OPTION VALUE="obs3"> Observatory3
<OPTION VALUE="obs..."> Observatory...
</SELECT>
<TD>

<TR>
<TH>Location Name
<TD colspan="2"><SELECT MULTIPLE NAME="location">
<OPTION VALUE="all"> All Locations
<OPTION VALUE="loc1"> Location1
<OPTION VALUE="loc2"> Location2
<OPTION VALUE="loc3"> Location3
<OPTION VALUE="loc..."> Location...
</SELECT>
<TD>

<TR>
<TH>Location Type
<TD colspan="2"><SELECT MULTIPLE NAME="location-type">
<OPTION VALUE="all"> All Types
<OPTION VALUE="ground"> Ground Based
<OPTION VALUE="aircraft"> Airborne
<OPTION VALUE="earth"> Earth Orbit
<OPTION VALUE="solar"> Solar Orbit
</SELECT>
<TD>

<TR>
<TH colspan="4">Ground Based or Airborne

<TR>
<TH>
<TH>Minimum
<TH>Maximum
<TH>Comments

<TR>
<TH>Latitude (degrees)
<TD><INPUT TYPE="text" NAME="latitude-min" SIZE=7>
<TD><INPUT TYPE="text" NAME="latitude-max" SIZE=7>
<TD>

<TR>
<TH>Longitude (degrees)
<TD><INPUT TYPE="text" NAME="longitude-min" SIZE=7>
<TD><INPUT TYPE="text" NAME="longitude-max" SIZE=7>
<TD>

<TR>
<TH>Elevation (meters)
<TD><INPUT TYPE="text" NAME="elevation-min" SIZE=7>
<TD><INPUT TYPE="text" NAME="elevation-max" SIZE=7>
<TD>

<TR>
<TH>Seeing (arcseconds)
<TD><INPUT TYPE="text" NAME="seeing-min" SIZE=7>
<TD><INPUT TYPE="text" NAME="seeing-max" SIZE=7>
<TD>

<TR>
<TH>Water Wapor (mm of Hg)
<TD><INPUT TYPE="text" NAME="water-vapor-min" SIZE=7>
<TD><INPUT TYPE="text" NAME="water-vapor-max" SIZE=7>
<TD>

<TR>
<TH colspan="4">Earth Orbit

<TR>
<TH>
<TH>Minimum
<TH>Maximum
<TH>Comments

<TR>
<TH>Apogee (km)
<TD><INPUT TYPE="text" NAME="apogee-min" SIZE=7>
<TD><INPUT TYPE="text" NAME="apogee-max" SIZE=7>
<TD>

<TR>
<TH>Eccentricity
<TD><INPUT TYPE="text" NAME="eccentricity-min" SIZE=7>
<TD><INPUT TYPE="text" NAME="eccentricity-max" SIZE=7>
<TD>

<TR>
<TH>Inclination (degrees)
<TD><INPUT TYPE="text" NAME="inclination-min" SIZE=7>
<TD><INPUT TYPE="text" NAME="inclination-max" SIZE=7>
<TD>

<TR>
<TH>Precession Period (days)
<TD><INPUT TYPE="text" NAME="precession-period-min" SIZE=7>
<TD><INPUT TYPE="text" NAME="precession-period-max" SIZE=7>
<TD>

<TR>
<TH colspan="4">Solar Orbit

<TR>
<TH>
<TH>Minimum
<TH>Maximum
<TH>Comments

<TR>
<TH>Apohelion (AU)
<TD><INPUT TYPE="text" NAME="apohelion-min" SIZE=7>
<TD><INPUT TYPE="text" NAME="apohelion-max" SIZE=7>
<TD>

<TR>
<TH>Eccentricity
<TD><INPUT TYPE="text" NAME="solar-eccentricity-min" SIZE=7>
<TD><INPUT TYPE="text" NAME="solar-eccentricity-max" SIZE=7>
<TD>

</TABLE>

<INPUT TYPE="submit" VALUE="Submit Query">
<INPUT TYPE="reset" VALUE="Reset Fields">

</FORM>

</BODY>
</HTML>


--------------030708050009060805000604--

From - Mon Apr 28 13:29:48 2003
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Subject: Re: RWP04: Registry Replication
From: Keith Noddle <ktn@star.le.ac.uk>
To: IVOA Registry mailing list <registry@ivoa.net>
In-Reply-To: <06d201c30b50$ae967110$6b91d783@cacr.caltech.edu>
References: 
	 <Pine.OSF.4.33.0304251752090.1276174-100000@msslai.mssl.ucl.ac.uk>
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On Fri, 2003-04-25 at 18:32, Roy Williams wrote:
> > > How about if we have three types of registry:
> > >
> > > 1. full: will attempt to maintain a full list of all resources on the VO
> > > 2. limited: lists only resources of interest to a specific community
> > > 3. private: only lists the resources at that location; not queryable
> 
> There is a smooth transition here to what we might call type 4: a service

I am slightly uneasy about different registry "types" as that
potentially leads to management and hierarchy issues. I prefer the
notion of a self regulating network of registries which "do the right
thing" among themselves. Building upon previous discussions, I'd like to
float the following:

      * A registry is viewed just another a resource

      * By definition, resource entries in a registry include a
        description of themselves (note: fine grained vs coarse grained
        resource metadata? This proposal requires fine grained)

      * The description of the content of a registry grows as other
        resources are added to it, BUT:

      * It is only necessary to add the "new" metadata from the added
        resource to the registry description (the goal being that the
        registry description contains the scope of the resources it
        holds but not the detail, that is in the individual resource
        descriptions)

      * All registries mirror all other registries

      * A registry only actions queries against resources for which it
        is authoritative (i.e. not resources for which it is a mirror),
        BUT:

      * A registry can initiate a query requesting it be actioned
        against mirrored resources (to manage "registry unavailable"
        problems - this needs further work)

Thus:

     1. Queries will be targeted to registries which contain relevant
        resources
     2. Duplication will be reduced to a minimum
     3. "Gridiness" will be upheld
     4. scope={"all","target","this"} will be supported (but "all" will
        obey [1] above)
     5. Time-To-Live can be supported
     6. Queries will never be more than 1 level deep
     7. Fail-over will be supported.

Keith.

-- 

Keith Noddle			Phone:  +44 (0)116 223 1894
AstroGrid Technical Lead	Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy	Mobile: +44 (0)7721 926 461
University of Leicester		Email:  ktn@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>
To: "'IVOA Registry mailing list'" <registry@ivoa.net>
Subject: RE: RWP04: Registry Replication
Date: Mon, 28 Apr 2003 13:08:48 +0100
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Comments embedded...

> -----Original Message-----
> From: Keith Noddle [mailto:ktn@star.le.ac.uk] 
> Sent: 28 April 2003 12:23
> To: IVOA Registry mailing list
> Subject: Re: RWP04: Registry Replication
> 
> 
> On Fri, 2003-04-25 at 18:32, Roy Williams wrote:
> > > > How about if we have three types of registry:
> > > >
> > > > 1. full: will attempt to maintain a full list of all 
> resources on 
> > > > the VO 2. limited: lists only resources of interest to 
> a specific 
> > > > community 3. private: only lists the resources at that 
> location; 
> > > > not queryable
> > 
> > There is a smooth transition here to what we might call type 4: a 
> > service
> 
> I am slightly uneasy about different registry "types" as that 
> potentially leads to management and hierarchy issues. I 
> prefer the notion of a self regulating network of registries 
> which "do the right thing" among themselves. Building upon 
> previous discussions, I'd like to float the following:
> 
>       * A registry is viewed just another a resource

Correct.

>       * By definition, resource entries in a registry include a
>         description of themselves (note: fine grained vs 
> coarse grained
>         resource metadata? This proposal requires fine grained)

We should not dictate the content or structure of registries. I'm not sure
why 'requires fine grained'.

>       * The description of the content of a registry grows as other
>         resources are added to it, BUT:
> 
>       * It is only necessary to add the "new" metadata from the added
>         resource to the registry description (the goal being that the
>         registry description contains the scope of the resources it
>         holds but not the detail, that is in the individual resource
>         descriptions)

I'm lost. What is 'scope of the resources'?

>       * All registries mirror all other registries

In content? Or just mirrors the list of registries?

>       * A registry only actions queries against resources for which it
>         is authoritative (i.e. not resources for which it is 
> a mirror),

If it mirrors the resource metadata, why shouldn't it answer the queries?

>         BUT:
> 
>       * A registry can initiate a query requesting it be actioned
>         against mirrored resources (to manage "registry unavailable"
>         problems - this needs further work)

??

'fraid I'm lost here.

> Thus:
> 
>      1. Queries will be targeted to registries which contain relevant
>         resources
>      2. Duplication will be reduced to a minimum
>      3. "Gridiness" will be upheld
>      4. scope={"all","target","this"} will be supported (but 
> "all" will
>         obey [1] above)
>      5. Time-To-Live can be supported
>      6. Queries will never be more than 1 level deep
>      7. Fail-over will be supported.
> 
> Keith.
> 
> -- 
> 
> Keith Noddle			Phone:  +44 (0)116 223 1894
> AstroGrid Technical Lead	Fax:    +44 (0)116 252 3311
> Dept of Physics & Astronomy	Mobile: +44 (0)7721 926 461
> University of Leicester		Email:  ktn@star.le.ac.uk
> Leicester, UK   LE1 7RH		Web:    http://www.astrogrid.org
> 

From - Mon Apr 28 15:19:48 2003
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Subject: RE: RWP04: Registry Replication
From: Keith Noddle <ktn@star.le.ac.uk>
To: ael@star.le.ac.uk
Cc: IVOA Registry mailing list <registry@ivoa.net>
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Ah, poorly explained, I'll try again...

> > 
> >       * A registry is viewed just another a resource
> 
> Correct.
> 
> >       * By definition, resource entries in a registry include a
> >         description of themselves (note: fine grained vs 
> > coarse grained
> >         resource metadata? This proposal requires fine grained)
> 
> We should not dictate the content or structure of registries. I'm not sure
> why 'requires fine grained'.
Agreed but we can define the structure of the metadata which describes
the registry. The more information in that metadata, the better the
searching will be.

> 
> >       * The description of the content of a registry grows as other
> >         resources are added to it, BUT:
> > 
> >       * It is only necessary to add the "new" metadata from the added
> >         resource to the registry description (the goal being that the
> >         registry description contains the scope of the resources it
> >         holds but not the detail, that is in the individual resource
> >         descriptions)
> 
> I'm lost. What is 'scope of the resources'?
An example (forgive me if this is astronomically challenged, it's the
principle): say a registry has entries for 3 resources an X-Ray all sky
survey, a radio all sky survey and a radio northern hemisphere survey.
The metadata for the *registry* needs to reflect that it has resources
which include X-Ray, Radio, All-sky and Northern Hemisphere. Then if the
query calls for say, optical data, this registry can be omitted from
"scope={"all}" type queries. I realise the more resources there are in a
registry the less selective this becomes, but there are other options
for making this type of information useful.
 
> 
> >       * All registries mirror all other registries
> 
> In content? Or just mirrors the list of registries?
I should have said "All registries contain the metadata descriptions of
all other registries." i.e. a registry has all the other registries
entered as a resource. I was alluding to mirroring as the mechanism
whereby the metadata would be shared. My apologies.

> 
> >       * A registry only actions queries against resources for which it
> >         is authoritative (i.e. not resources for which it is 
> > a mirror),
> 
> If it mirrors the resource metadata, why shouldn't it answer the queries?
Because it only contains the metadata describing the registries,
"mirror" was the wrong term to use. See above.

> 
> >         BUT:
> > 
> >       * A registry can initiate a query requesting it be actioned
> >         against mirrored resources (to manage "registry unavailable"
> >         problems - this needs further work)
> 
> ??
> 
> 'fraid I'm lost here.
One of the concerns about "multicast queries" was the amount of
redundant responses that would be generated when a resource is known to
more than one registry (i.e. mirrored). There was a suggestion that a
resource be marked as local or mirrored. Assuming this to be the case,
I'm proposing that when a suitable resource is located, only the
registry which owns that resource (i.e. the registry for which the
resource is local) answer the query, thus removing redundant responses.
In the event that registry is unavailable, we need a mechanism to get
one of the mirrors to respond instead.

Hope this clarifies a little...

Keith.

-- 

Keith Noddle			Phone:  +44 (0)116 223 1894
AstroGrid Technical Lead	Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy	Mobile: +44 (0)7721 926 461
University of Leicester		Email:  ktn@star.le.ac.uk
Leicester, UK   LE1 7RH		Web:    http://www.astrogrid.org

From - Mon Apr 28 18:29:48 2003
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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: "'IVOA Registry mailing list'" <registry@ivoa.net>
Subject: Schedule for interop week
Date: Mon, 28 Apr 2003 17:25:10 +0100
Organization: University of Leicester
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We need to pull together a schedule for the interoperability week. Pierre
has indicated that he wants to give a presentation - does anyone else also
want to do this?

We have all day Wednesday available, though I'll be out during the AVO Exec
meeting in the afternoon.

On Thursday we have 2 hours to present the work package draft documents.

As a starter for discussion, how about the following:

Wednesday
=========
09:30		Rwp02: draft specs presentation	Mark
09:50		Rwp03: draft specs presentation	Ray
10:10		Rwp04: draft specs presentation	Keith

10:30 BREAK

11:00		Rwp02: discussion				Mark
11:30		Rwp03: discussion				Ray
12:00		Rwp04: discussion				Keith

12:30		Rwp01: presentation & discussion	Tony

13:00	LUNCH

14:00		Presentations from individuals
		 - Pierre
		 - ???

15:00		Carry on RwpNN discussions		Bob
		 to redraft specs

??:??	BACK to hotels to rewrite presentations!!

Thursday
========
09:00		Rwp01: presentation & questions		Tony
09:15		Rwp02: presentation & questions		Mark
09:45		Rwp03: presentation & questions		Ray
10:15		Rwp04:: presentation & questions		Keith
10:45		General feedback & discsussion		Bob


*PLEASE NOTE: every WP must have distributed their draft specification to
the mailing list and posted it onto their wiki page by 12:00 noon Friday 9th
May. People should come to the meeting with specific questions, having read
the papers.

How does this sound?

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 Apr 30 08:29:51 2003
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Date: Wed, 30 Apr 2003 01:27:02 -0500 (CDT)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: IVOA Registry mailing list <registry@ivoa.net>
Subject: Re: RWP04: Registry Replication
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Hi,

Nice work on these requirements, Keith.  (I've had my head in prep for a 
conference, so sorry if I'm still catching up on the discussion.)

> 6. Flexible
>       * Registries should support rich data enquiries.
>       * A registry should also support "data harvesting" by other
>         registries. This allows registry data to be copied and expanded
>         as required as well as supporting data redundancy through data
>         replication.

It is not necessary that a registry support both functions.  There are 
good reasons why one might not want to support both a searchable interface 
and a harvestable one.  See below.

> 1. Distributed
>       * It probably doesn't make sense to store all of the registry data
>         in every registry. This implies a distributed model of registry
>         searching and maintenance.

Given the extensive discussion about possible designs for replication, I 
think we need to spell out *why* we think we need a distributed registry.  
What does it do for us?  Here are some possible reasons:

  a.  Redundancy:  guarantees that there is always a registry available  
         to applications looking for resources.

  b.  Specialization:  a registry can specialize in certain types of 
         resources, topics, frequency bands, or some idiosyncratic notion 
         of data quality.  

  c.  Scalability:  larger registries might be harder to maintain; 
         distributed registries might make better use of bandwidth; ...

  d.  Control and Maintanance:  it might be easier for a large-ish data
         provider to maintain/update its resource records if it ran its 
         own registry.

Now, personally, I do *not* thing (c) is a good reason.  In my mind, the 
point of the registry is that users can go to one place to find other 
resources.  The data in a registry is meant to be light-weight.  So I 
don't see the need to go to a multiple registries to find everything.

(d) is interesting but it doesn't require that the provider-run registry 
support search queries; the metadata just needs to be harvestable.  
In the OAI model, replication of the data is handled separately from 
search queries.  I think this is a good idea.

(a) and (b) sound pretty good to me, though.  Given this, I think the 
full-limited-private model seems pretty good for searchable registries.  
The "full" type claims that it tries to hold all (harvestable) resource 
metadata.  (d) corresponds to the "private" registry.  

> 2. Self maintaining
>       * The registries should place the absolute minimum burden upon the
>         data centres where they run. On-going maintenance costs are
>         mostly those relating to support personnel, so the less human
>         intervention the better.

Note that the overhead for searchable registries is going to be larger.  A 
more complex querying interface is necessary, and since it plays a more 
active role in applications, it needs to more reliable.  On the other 
hand, if your registry is just meant for harvesting by searchable 
registries, then the demands are lighter.  For small registries, it may 
mean, for example, that running a database is not necessary.

I suspect that the need for low-cost is going to be greatest for providers 
who run a registry primarily for just getting their metadata out there.  
Providing a searchable interface for applications is less likely to be 
important (or useful).

>       * Registries should where possible manage their own data integrity
>         (backups etc)

Does this mean that a registry system has built into it the ability, say, 
to write its contents to tape?  I think backup should not be part of the 
design.  A lower-cost solution is to let the curator use whatever 
backup method used for any other kind of data they maintain.  We do want 
to watch for requirements or design choices that make common backup 
methods difficult.  (Maybe I'm reading this requirement wrong.)

>       * Self maintenance almost certainly implies a peer network of
>         registries.

(Not sure why.)

cheers,
Ray


From - Wed Apr 30 10:49:51 2003
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Subject: Re: RWP04: Registry Replication
From: Keith Noddle <ktn@star.le.ac.uk>
To: Ray Plante <rplante@ncsa.uiuc.edu>
Cc: IVOA Registry mailing list <registry@ivoa.net>
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Status:   

Thanks for the feedback Ray - much appreciated!

I think we're all converging on the model proposed by Tony which, to
paraphrase Ray, is the full-(specialist/limited)-(source/private) model.
I think this pretty much satisfies the points raise by Wil and Ray as
well as meeting most of the useful requirements I originally proposed.
I'll start work on the design and get something posted on the IVOA Wiki
for comment - I'm conscious of the need to get a presentation together
in short order for Cambridge!

The other major aspect of the RWP04 work is the development of a
registry query schema. Tony, Elizabeth and I have been working on
something similar(!) for AstroGrid and whilst we don't yet have schema,
we have a simple example XML query (below) upon which I would welcome
everyone's comments. We are looking into XQuery/XPath, but that might
not be appropriate for the current iteration of AstroGrid. Again, your
comments would be welcome.

Keith.

-- 

Keith Noddle			Phone:  +44 (0)116 223 1894
AstroGrid Technical Lead	Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy	Mobile: +44 (0)7721 926 461
University of Leicester		Email:  ktn@star.le.ac.uk
Leicester, UK   LE1 7RH		Web:    http://www.astrogrid.org

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

If the query we are trying to satisfy can be expressed in pseudo-SQL as:

SELECT * FROM <registry> WHERE 
   (
      TYPE="white dwarf star" AND 
      (WAVELENGTH="optical" OR WAVELENGTH="uv") AND 
      (KEYWORD="BPM 16274" OR 
         KEYWORD="GD 50" OR 
         KEYWORD="HST photometric standards"
      )
   )

then one way of presenting this in XML is shown below

<query>
   <selectionSequence>
      <selection>
         <item>type</item>
         <value>white dwarf star</value>
      </selection>
      <operator>AND</operator>
      <selectionSequence>
         <selection>
            <item>wavelength</item>
            <value>optical</value>
         </selection>
         <operator>OR</operator>   
         <selection>
            <item>wavelength</item>
            <value>uv</value>
         </selection>
      </selectionSequence>
      <operator>AND</operator>
      <selectionSequence>
         <selection>
            <item>keyword</item>
            <value>BPM 16274</value>
         </selection>
         <operator>OR</operforator>   
         <selection>
            <item>keyword</item>
            <value>GD 50</value>
         </selection>
         <operator>OR</operator>   
         <selection>
            <item>keyword</item>
            <value>HST photometric standards</value>
         </selection>
      </selectionSequence>
   </selectionSequence>
</query>

This only requires 6 tags and is sufficiently flexible to cope with most
queries I can think of - but I'm not an astronomer...!

From - Wed Apr 30 13:49:50 2003
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Date: Wed, 30 Apr 2003 12:35:20 +0100 (BST)
From: Elizabeth Auden <eca@mssl.ucl.ac.uk>
To: IVOA Registry mailing list <registry@ivoa.net>
Subject: Re: RWP04: Registry Replication
In-Reply-To: <1051692104.1040.23.camel@rocky.star.le.ac.uk>
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Hi all,

> registry query schema. Tony, Elizabeth and I have been working on
> something similar(!) for AstroGrid and whilst we don't yet have schema,
> we have a simple example XML query (below) upon which I would welcome
> everyone's comments.

Here's the current draft of the astrogrid registry query schema that
matches up with Keith's query example (schema is pasted under the query).
Still evolving, so comments welcome.

cheers,
Elizabeth

> <query>
>    <selectionSequence>
>       <selection>
>          <item>type</item>
>          <value>white dwarf star</value>
>       </selection>
>       <operator>AND</operator>
>       <selectionSequence>
>          <selection>
>             <item>wavelength</item>
>             <value>optical</value>
>          </selection>
>          <operator>OR</operator>
>          <selection>
>             <item>wavelength</item>
>             <value>uv</value>
>          </selection>
>       </selectionSequence>
>       <operator>AND</operator>
>       <selectionSequence>
>          <selection>
>             <item>keyword</item>
>             <value>BPM 16274</value>
>          </selection>
>          <operator>OR</operforator>
>          <selection>
>             <item>keyword</item>
>             <value>GD 50</value>
>          </selection>
>          <operator>OR</operator>
>          <selection>
>             <item>keyword</item>
>             <value>HST photometric standards</value>
>          </selection>
>       </selectionSequence>
>    </selectionSequence>
> </query>

QUERY SCHEMA:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="selection">
     <xs:complexType>
        <xs:sequence>
           <xs:element maxOccurs="1" minOccurs="1" name="item" type="xs:string"/>
           <xs:element maxOccurs="1" minOccurs="1" name="value" type="xs:string"/>
        </xs:sequence>
     </complexType>
  </xs:element>
  <xs:element name="operator">
     <xs:complexType>
        <xs:choice>
           <xs:element maxOccurs="1" minOccurs="0" ref="AND"/>
           <xs:element maxOccurs="1" minOccurs="0" ref="OR"/>
           <xs:element maxOccurs="1" minOccurs="0" ref="NOT"/>
        </xs:choice>
     </xs:complexType>
  </xs:element>
  <xs:element name="selectionSequence">
     <xs:complexType>
        <xs:sequence>
           <xs:element maxOccurs="unbounded" minOccurs="1" ref="selection"/>
           <xs:element maxOccurs="unbounded" minOccurs="0" ref="operator"/>
        </xs:sequence>
     </xs:complexType>
  </xs:element>
  <xs:element name="query">
     <xs:complexType>
        <xs:sequence>
           <xs:element maxOccurs="unbounded" minOccurs="1" ref="selectionSequence"/>
        </xs:sequence>
     </xs:complexType>
  </xs:element>
</xs:schema>



From - Wed Apr 30 15:34:50 2003
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Date: Wed, 30 Apr 2003 09:30:32 -0400
From: "Wil O'Mullane" <womullan@skysrv.pha.jhu.edu>
To: Keith Noddle <ktn@star.le.ac.uk>
Cc: Ray Plante <rplante@ncsa.uiuc.edu>,
   IVOA Registry mailing list <registry@ivoa.net>
Subject: Re: RWP04: Registry Replication
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> we have a simple example XML query (below) upon which I would welcome
> everyone's comments. We are looking into XQuery/XPath, but that might
> not be appropriate for the current iteration of AstroGrid. Again, your
> comments would be welcome.

So why not just use the SQL - it is already a fairly standard query language ?
Converting the query to XML just for the sake of having XML seems rather pointless.
If we are converging on the full/private model then the schema's of the full registries should be the same. Now running ahead a little assuming the obvious implementation for a searchable set of records is to use a relational database it
would process SQL directly..
we have been playing with this a little and made a web service to support a 
predicate  like " Publisher like'%Roy%' and Subject like '%Optical%' or Subject like '%Radio%' "

http://sdssdbs1.stsci.edu/nvo/registry/Registry.asmx

Normally we would expect this to be called in code although you may invoke it using a form  also
http://sdssdbs1.stsci.edu/nvo/registry/Registry.asmx?op=QueryRegistry

 
http://sdssdbs1.stsci.edu/nvo/registry/Registry.asmx/QueryRegistry?predicate=Publisher+like%27%25Roy%25%27+and+Subject+like+%27%25Optical%25%27+or+Subject+like+%27%25Radio%25%27

Also I feel a WebService is the best way to access something like this - making it easy to build registry queries into any other apps we are making...

wil

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To: "Wil O'Mullane" <womullan@skysrv.pha.jhu.edu>,
   Keith Noddle <ktn@star.le.ac.uk>
From: Masatoshi OHISHI <masatoshi.ohishi@nao.ac.jp>
Subject: Re: RWP04: Registry Replication
Cc: Ray Plante <rplante@ncsa.uiuc.edu>,
   IVOA Registry mailing list <registry@ivoa.net>
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Status:   

Wil,

I fully agree with you.

At 09:30 03/04/30 -0400, Wil O'Mullane wrote:

>So why not just use the SQL - it is already a fairly standard query language ?
>Converting the query to XML just for the sake of having XML seems rather 
>pointless.
>If we are converging on the full/private model then the schema's of the 
>full registries should be the same. Now running ahead a little assuming 
>the obvious implementation for a searchable set of records is to use a 
>relational database it
>would process SQL directly..

Our JVO prototype is now running, and uses SQL to interface to each relational
database.  We adopted this to minimize our effort to prepare modules
between our JVO system and existing databases.  And we adopted some Web
service functions to manage metadata (registry), and it is working quite well.

    Masatoshi


**********************************************
                 Masatoshi  OHISHI
National Astronomical Observatory of Japan
2-21-1, Osawa, Mitaka, Tokyo, 181-8588 JAPAN
phone :+81-422-34-3575  (office)
        +81-90-3574-9474 (mobile)
fax   :+81-422-34-3840
e-mail:masatoshi.ohishi@nao.ac.jp
********************************************** 


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From: Anita Richards <amsr@jb.man.ac.uk>
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On Thu, 1 May 2003, David Barnes wrote:

>
> Hi Anita,
>
> I don't know whether the following entries come from you or
> Hanisch, but in:
>
> > COVERAGE
> ...
> > "ramin"                 decimal         (degrees)
> > "ramax"                 decimal         (degrees)
> > "decmin"                decimal         (degrees)
> > "decmax"                decimal         (degrees)
>
> I'm not at all clear on why we explicitly choose ra and dec
> as the required tags to define coverage.  They're not always
> particularly meaningful.  For example a study of the Galactic
> plane to +- 5 degrees Galactic latitude would have ra and dec
> extents which suggest a much larger area survey than what has
> actually been accomplished.
>
> I also imagine there are plenty of use cases where one might
> want to search on Galactic lat and long constraints rather
> than ra and dec.  To accommodate this, presumably registry
> searching tasks/facilities will have conversion capabilities
> built in, but that simply doesn't help in the case above.
> So, given that conversion facilities will be ubiquitous,
> why don't we take advantage of all the hard work done in
> describing the various reference frames (eg. Calabretta et
> al.) and allow the coverage to be specified by something
> more like:
>
> "longmin"
> "longmax"
> "latmin"
> "latmax"
> "directionsystem" string (J2000,B1950,GALACTIC, ...)
>
> As usual if this has been discussed in the past or elsewhere,
> just point me to that and I'll go and fill my brain with the
> necessary prerequisites!
>
> David.
>
>

Dear David,

These are good points worthy of discussion.  Bob Hanisch et al.'s document
does allow for a greater variety of ways to describe angular coverage,
similar to what you suggest.

However, in discussions in AstroGrid, we felt the list of ways to outline
angular coverage was becoming rather large and complex.  There was general
agreement (I think!) that the ideal system would be a form of indexing.
The sky is divided into fairly coarse bins so that the total number can be
searched effectively instantaneously (10^4? 10^5?) and each dataset has a
matrix of 1's and 0's indicating whether or not there *might* be data in
each bin (eg a bin overlapping the error circle of a source position, or
way down in the field of view of an interferometer, would still be a '1').
This could be drawn up on ingestion of a dataset.

But we don't yet have the algorithm to do that!  So in the meanwhile - and
as a higher-level filter in any case - we will adopt simpler limits.  I am
suggesting these are, initially, just min and max RA and Dec.  This is
just for the ResourceMetadata held by the Registry, to be used to see if
it is even worth looking at a data set in more detail.  So we may waste
time looking in the wrong corners of a dataset which only covers the
Galactic plane, but it fullfils the minimum requirement of not falsely
rejecting useful datasets.  I am also assuming that we precess all the
limits to J2000 - for the above reasons high accuracy does not matter at
this level.

In effect this is a subset of Bob et al's requirements
- Region Name: box
- cframe     : FK5

The main reaosn for this is that it can be specified automatically using
readily available algorithms - finding extrema and using standard
coordinate conversions.  The other suggestions from Bob et al.  - and
AstroGrid - (e.g. polygon, indexing) require work seems to me less urgent
than getting the skeleton Registry up and running.  For this reason it is
a good starting point for the International Registry which does not want
to be more complex than more local ones, I woudl think.

Moreover, we should decide what extra details we do need in the light of
tests against real science cases, e.g. the ones which Mark Allen has
proposed and the other AstroGrid ones.  And, of course, for some data sets
angular coverage is not relevant anyway...

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 - Wed Apr 30 18:09:51 2003
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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: "'IVOA Registry mailing list'" <registry@ivoa.net>
Subject: RE: RWP04: Registry Replication
Date: Wed, 30 Apr 2003 17:07:31 +0100
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Hi Wil,

> So why not just use the SQL

The SQL does not exist. The query is derived from a set of drop-down boxes
on a form, not just typed in. It would be more work for the portal workflow
component to construct the SQL and for the registry to parse it and amend it
to whatever database schema is used than to take in a generic query
structure in xml form and turn that into the appropriate SQL (or whatever)
for the way that the registry is stored.

> Also I feel a WebService is the best way to access something 
> like this - making it easy to build registry queries into any 
> other apps we are making...

We are using web services (and later, grid services).


Cheers,
Tony. 

> -----Original Message-----
> From: Wil O'Mullane [mailto:womullan@skysrv.pha.jhu.edu] 
> Sent: 30 April 2003 14:31
> To: Keith Noddle
> Cc: Ray Plante; IVOA Registry mailing list
> Subject: Re: RWP04: Registry Replication
> 
> 
> 
> > we have a simple example XML query (below) upon which I 
> would welcome 
> > everyone's comments. We are looking into XQuery/XPath, but 
> that might 
> > not be appropriate for the current iteration of AstroGrid. 
> Again, your 
> > comments would be welcome.
> 
> So why not just use the SQL - it is already a fairly standard 
> query language ? Converting the query to XML just for the 
> sake of having XML seems rather pointless. If we are 
> converging on the full/private model then the schema's of the 
> full registries should be the same. Now running ahead a 
> little assuming the obvious implementation for a searchable 
> set of records is to use a relational database it would 
> process SQL directly.. we have been playing with this a 
> little and made a web service to support a 
> predicate  like " Publisher like'%Roy%' and Subject like 
> '%Optical%' or Subject like '%Radio%' "
> 
http://sdssdbs1.stsci.edu/nvo/registry/Registry.asmx

Normally we would expect this to be called in code although you may invoke
it using a form  also
http://sdssdbs1.stsci.edu/nvo/registry/Registry.asmx?op=QueryRegistry

 
http://sdssdbs1.stsci.edu/nvo/registry/Registry.asmx/QueryRegistry?predicate
=Publisher+like%27%25Roy%25%27+and+Subject+like+%27%25Optical%25%27+or+Subje
ct+like+%27%25Radio%25%27

Also I feel a WebService is the best way to access something like this -
making it easy to build registry queries into any other apps we are
making...

wil


From - Wed Apr 30 18:14:51 2003
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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: "'IVOA Registry mailing list'" <registry@ivoa.net>
Subject: RE: RWP04: Registry Replication
Date: Wed, 30 Apr 2003 17:10:37 +0100
Organization: University of Leicester
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> Our JVO prototype is now running, and uses SQL to interface 

We're restricting the AstroGrid queries in the first instance to what can be
done with drop-down boxes, checkboxes etc, so it is easier to construct the
query in xml, pass it to whatever needs to use it (resource registry, data
source) and let it decode to the appropriate form (SQL in the case of
rdbms).

Cheers,
Tony. 

> -----Original Message-----
> From: Masatoshi OHISHI [mailto:masatoshi.ohishi@nao.ac.jp] 
> Sent: 30 April 2003 15:31
> To: Wil O'Mullane; Keith Noddle
> Cc: Ray Plante; IVOA Registry mailing list
> Subject: Re: RWP04: Registry Replication
> 
> 
> Wil,
> 
> I fully agree with you.
> 
> At 09:30 03/04/30 -0400, Wil O'Mullane wrote:
> 
> >So why not just use the SQL - it is already a fairly standard query 
> >language ? Converting the query to XML just for the sake of 
> having XML 
> >seems rather pointless. If we are converging on the 
> full/private model 
> >then the schema's of the full registries should be the same. Now 
> >running ahead a little assuming the obvious implementation for a 
> >searchable set of records is to use a relational database it
> >would process SQL directly..
> 
> Our JVO prototype is now running, and uses SQL to interface 
> to each relational database.  We adopted this to minimize our 
> effort to prepare modules between our JVO system and existing 
> databases.  And we adopted some Web service functions to 
> manage metadata (registry), and it is working quite well.
> 
>     Masatoshi
> 
> 
> **********************************************
>                  Masatoshi  OHISHI
> National Astronomical Observatory of Japan
> 2-21-1, Osawa, Mitaka, Tokyo, 181-8588 JAPAN
> phone :+81-422-34-3575  (office)
>         +81-90-3574-9474 (mobile)
> fax   :+81-422-34-3840
> e-mail:masatoshi.ohishi@nao.ac.jp
> ********************************************** 
> 
> 


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From: Anita Richards <amsr@jb.man.ac.uk>
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Having just glanced at Alberto's mail in respons to Keith, I have realised
my attempt to post some suggestions have not appeared, sorry - this may
answer some of Alberto's points regarding a controlled vocabulary,
separating layers of description etc..

The material below can also be found at
http://wiki.astrogrid.org/bin/view/Astrogrid/DataServiceSchema with links
which help to explain it.

It is intended to describe the science content of the *summary* of
astronomical datasets held by the registry, not the list of UCDs or
evaluations of the contents of the dataset.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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).

Tentative ammendments to Keith's RegistrySchema

AMSR comments and changes marekd *

Hanisch et al. is the most recent (presently v.6) version of the document
also referred to as
(not)Bob's.

Mostly this is as per Hanisch et al. but some changes - e.g.
- spatial is incorrect for sky coverage/position/resolution, should be
angular
- some things added

SEE NOTES AT END

-----------------------------------------
dataService


Schema: http://www.w3.org/2001/XMLSchema

include: schemaLocation="serviceLocation.xsd"

elements:

CONTENT
"content"               string          (see elements following)*
"facility"              string
"instrument"            string
"format"                string          (VOTable, ascii, FITS etc?)*
"briefsummary"          string
"tablenrows"            integer         (Number of rows in table)*
"tablencols"            integer         (Number of columns in table)*
"tablesize"             decimal         (bytes - size of table excl.
linked nDim data)*
"ndimdatasetsizemin"    decimal         (bytes)*
"ndimdatasetsizemax"    decimal         (bytes)*
"nndimdatasets"         integer         (number of nDim data sets)*
"type"                  string          (archive, survey, catalogue,
bibliography,
                                         journal, library, outreach,
education,
                                         eporesource, integrated,
nameresolver)
"subjectkeyword"        string          (Galaxies, Milky Way, Nebulae,
Planets,
                                         Solar system, Stars)*
---

COVERAGE
"coverage"              string          (see elements following)*
"wavelengthrange"       string          (gammaray, xray, xuv, uv, optical,
ir,
                                         mmwave, radio)
"wavelengthshort"       decimal         (metres)
"wavelengthlong"        decimal         (metres)
"ramin"                 decimal         (degrees)
"ramax"                 decimal         (degrees)
"decmin"                decimal         (degrees)
"decmax"                decimal         (degrees)
"sensitvity"            decimal         (Jansky? also allow Magnitude?
eV?)
"startdate"             decimal         (JD) or (YYYY.DD) or date
(CCYY-MM-DD)*
"enddate"               decimal         (JD) or (YYYY.DD) or date
(CCYY-MM-DD)*
"angularfraction"       decimal         (dimensionless fraction)
"spectralfraction"      decimal         (dimensionless fraction)
"temporalfraction"      decimal         (dimensionless fraction)
"sourcedensity"         decimal         (counts per square degree)
---

RESOLUTION
"resolution"            string          (see elements following)*
"angularresolution"     decimal         (degrees? arcsec?)
"spectralresolution"    decimal         (dimensionless fraction)
"temporalresolution"    decimal         (sec)
---

DATAQUALITY
"dataquality"           string          (see elements following)*
"astrometryerror"       decimal         (degrees? arcsec?)
"photometryerror"       decimal         (Jy? Magnitudes? eV?)
"timingerror"           decimal         (dec)

- - - - - - - - - -
NOTES

Suggested standard units/conventions:

see http://www.iau.org/IAU/Activities/nomenclature/units.html (This is
just for the ResourceMetadata;
for DataSets generally the wider conventions of CDS can be used).

I have suggested units; in some cases I suggest alternatives where the
conversion may be tricky or
where being totally consistent might lead to very small/large Nos (e.g.
degrees for angular position,
but arcsec for error is more usual) - however I would prefer to be
consistent, the first unit before ? is
preferred. Approximate conversions suffice to answer 'Is this catalogue
any use' with 'maybe/no'.

Hanisch et al. use decimal years for date but this is non-standard?
Convention for leap years not
well-known.

This has implications for the user query; for the very first iterations we
may have to force the user to
use standard units but very soon we should be able to interconvert
Jy/Mag/?x-ray units? and
wavelength/freq/eV units etc. For Resource metadata selection this does
not have to be precise.

Should the units be added to the schema?

Data types and null values

Is it simplest if every element should occur at least once, and we use
null values as suggested in the
[[http://cdsweb.u-strasbg.fr/doc/VOTable/votable-1-0.htx][VOTable
documentation]]? e.g. use NaN?
for decimals with no value and NULL for strings? Alternatively, if we need
to use the null value to sort
by, (e.g. (de)prioritise DataSets lacking the relevant ResourceMetadata
entry) xml allows INF and
-INF.


CONTENT

"subjectkeywords" (new element)

One or more keywords taken from the dataset header, e.g. a subset of the
third column on the Vizier
catalogue selection page. See
http://adc.gsfc.nasa.gov/adc/adc_keyword_index.html and
http://vizier.u-strasbg.fr/doc/ADCkwds.htx We should add from the ADC list
or the Vizier
simplification as required, sparingly.

Note planetary nebulae are Nebulae not planets
Galaxies means external galaxies, not the Milky Way

Is there anything equivalent for Solar/STP?

In Hanisch et al. 'subject' is included in curation metadata, but I feel
it fits better in content. However I
don't really mind; this and some other things listed under CONTENT below
should maybe be in
CURATION?

"type" means FITS, ASCII etc?

I am using 'table' to mean data which could be searched directly in a
database or be converted to
VOTable, e.g. a list of sources and properties. Other 'nDim' data which
requires special
viewers/extraction software, e.g. FITS, will always? have an associated
table describing it, e.g. a list
of pointings and other observationsal details.

I think that we can cover whether nDim data are images, spectra etc. by
whether elements like
"decmin" or "spectralresolution" have meaningful values, or the null
value.

COVERAGE

"angularfraction" (a fraction) is for datasets containing images or
imageable data; "sourcedensity"
(sources/deg^2) is for datasets containing lists of sources with
positions. Note that the total
fractional coverage is different from the resolution. In future iterations
AstroGrid want to go for
indexing/matrix representation rather than the shapes suggested by Hanisch
et al.?

RESOLUTION

Note that it is easier to express spectral resolution as (finest channel
width)/central value), e.g.
delta-lambda/lambda, as this avoids unit problems, but this cannot be done
in a universal way for
other sorts of resolution.

We should use the best value in the data for now, and later include
algorithms to allow for e.g.
angular reaolution as a funtion of frequency for multi-frequency data.

DATA QUALITY

Things like angularresolution and sensitivity will initially probably be
given as the best value of all
errors (systematic and random) correctly combined. However in some data
sets these may cover a
wide range. E.g. astrometry error can depend on sensitivity and
resolution; in observing logs
resolution may be frequency-dependent. Ultimately we should be able to
express these things as
functions which are evaluated depending on other bits of the data set or
even the query. E.g. the
MERLIN archive covers frequencies from 0.408 to 22 GHz has a best
resolution of 0.''008 but this is
at 22 GHz; the resolution at 5 GHz is 0."050 and if you want higher
resolution you have to go to e.g.
the EVN archive.

UCDs

Should there also be an element to link to the UCDs for the dataset?

Many of my changes are probably incorrect xml, sorry, but I hope intention
is clear.



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From: Anita Richards <amsr@jb.man.ac.uk>
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Subject: Registry science metadata - Brown Dwarf example
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Here is an example of the science metadata which would be pulled out of
the registry to answer one of the AstroGrid Science Cases.

I thnk that we need to be very clear about the difference between metadata
needed to enable dataset selection (automatic, using VO algorithms, or
just returning a list to the human), which can be handled in a separate
stage(s) just within the registry, and the metadata used in actually
evaluating the query; in the latter case we need to go and fetch the
dataset, or send an agent to extract values from it in situ, etc.

The material below can also be found at
http://wiki.astrogrid.org/bin/view/Astrogrid/BrownDwarfRegistryRequirements

with links to explanations, the original case etc.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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).

http://wiki.astrogrid.org/bin/view/Astrogrid/BrownDwarfMetadataList

BrownDwarf Registry Requirements - Science content

ResourceMetadata

Where values are strings, I have stated the options if specific values are
needed. Otherwise, I have
just given the value type, and the query will select values within a
specified range.

coverage "format" value = "ascii", = "VOTable"
coverage "decmin" value = decimal
coverage "sourcedensity" value = decimal
coverage "tablenrows" value = decimal
coverage "tablesize" value = decimal
coverage "startdate" value = decimal
dataquality "astrometryerror" value = decimal
dataquality "photometryerror" value = decimal
dataquality "timingerror" value = decimal
subjectkeyword value = "Null", = "Milky Way", = "Stars"
"type" value = "catalogue", = "survey"
wavelengthrange value = "ir", value = "optical"
wavelengthshort value = decimal
wavelengthlong value = decimal

Additional metadata if nDim data as well as catalogues are used:
coverage "angularfraction" value = decimal
coverage "format" value = "FITS"
resolution "angularresolution" value = decimal
resolution "spectralresolution" value = decimal
"type" value = "archive"
wavelengthrange value = "uv", value = "mm"

UCDs

Note these are not 'proper' UCDs as we do not yet have a final convention,
but show the sort of
things which need UCDs. I am not differentiating between UCDs in the
header e.g. to describe a
single overall positional uncertainty and UCDs for each column.

I hope we adopt some sort of modular or atomic UCD structure, and a
capacity to cross-reference
columns, so that UCDs below which are not single words would be built up
in a logical way but we do
not have to have e.g. PHOT_ABC where ABC is every possible frequency or
filter. The exact order of
conditional queries (e.g. look for Optical first? or Photometry first?)
depends on what UCD convention
we adopt. There may be more than one error per quantity, e.g. systematic
errors in the catalogue
header plus random errors per entry.

StellarCluster
Star
Membership of StellarCluster
AngularPosition (RA, Dec)
AngularPosition Error (RA, Dec)
ID
Epoch
Epoch Error
ProperMotion
ProperMotion Error
Optical Colour, Photometry (I_Band, R_Band, numerical band spec.))
IR Colour, Photometry (K_Band, numerical band spec.))
Photometry FilterBandpass (for the above, e.g. Cousins, Johnson)
Photometry Error (per band)
BrownDwarf
BrownDwarf Probability
Distance
Distance Error
Parallax
Parallax Error
DistanceModulus
DistanceModulus Error
DopplerVelocity
DopplerVelocity Error
ChemicalAbundance (Li, CH4 etc.)

Additional UCDs describing nDim image and spectral DataSets, if used.

-------------------------
http://wiki.astrogrid.org/bin/view/Astrogrid/BrownDwarfRegistryQueryExamples

Examples of searching the Registry:

For this example I consider only catalogues, not extraction of data from
images, spectra etc. If we
were doing the latter we would need additional ResourceMetadata about
angular coverage,
resolution etc.

I have used what I hope are JAVA arithmetical and logical operators in
most places for brevity,
occasionally I have spelt out operators for clarity.

1. RegistryQuery for potential Brown Dwarfs located in Galactic Clusters

1.1 Query ResourceMetadata

(format value == "ascii" || "VOTable") &&
(type value == "catalogue" || "survey") && (subjectkeywords value ==
"Null" ^ ("Milky Way" || "Stars")
&& (coverage "decmin" value != NaN))

This should select DataSets which are tabular (not images or other such -
this iteration) and
contains measurments of sources (as distinct from a list of instrument
pointings) (the suggested
values may not be a complete list) It either has no subjectkeywords, i.e.
the things it lists are
unclassified, or they are explicitly classified as Milky Way or Stars.

The DataSets should have meaningful values of decmin, implying that they
contains positional
information. This means that we must fill in angular coverage for any data
set containing celestial
coordinates or object names which can be resolved by SIMBAD into
coordinates.

1.2 From the DataSets meeting criteria in 1.1, query ResourceMetadata and
sort DataSets
accordingly (perform steps in order)

coverage "sourcedensity" descending order (ie high=good)
coverage "tablenrows" descending order for completeness or ascending order
for speed
coverage "tablesize" ascending order
dataquality "astrometryerror" ascending order
dataquality "timingerror" ascending order

This is an optional prioritisation step to allow only the DataSets which
are more likely to be useful to
be selected, and/or to choose the order in which DataSets are queried or
(the interim results) moved.
Prioritisation could be applied at any later step. Other criteria like
sensitivity could also be used. This
implies that, for the errors, NaN counts as very large. It would be
simplest if Null values were not
allowed for sourcedensity and the size etc. of the DataSets

1.3 From the DataSets meeting criteria in 1.1, query UCD list

UCD == (StellarCluster || (Star && MembershipofStellarCluster?))

This should select DataSets which either explicitly list stellar clusters,
or which list stars and states
whether they are members of a cluster.

3. RegistryQuery for existing proper motion and distance measurements

3.1 From the DataSets meeting criteria in 1.1, query UCD list

UCD == (ProperMotion)

AND

3.2 From the DataSets meeting criteria in 1.1, query ResourceMetadata

coverage "startdate" value != NaN

This should select DataSets with meaningful values of the epoch of
observation (so proper motions
could be calculated if not already explicitly catalogued).

5. RegistryQuery to enable colour-colour selection:

5.1 From the DataSets meeting criteria in 1.1, query ResourceMetadata

wavelengthrange (value = "ir" || value = "optical")

This should select DataSets which explicitly contain optical or IR
measurements.

5.2 From the DataSets meeting criteria in 5.1, query ResourceMetadata
((wavelengthshort (value x))
||
(wavelengthshort (value y)))

This should select DataSets which explicitly contain optical or IR
measurements, or which cover at
least part of the wavelength range x-y which covers the I, R and K bands
as defined in the optical/IR.

AND

5.3 From the DataSets meeting criteria in 5.1, query UCD list

UCD = (Optical && (Photometry && ((I_Band || R_Band || numerical band
spec.)))) ||
(IR && (Photometry && ((K_Band || numerical band spec.)))) ||
((Optical || IR) && (Colour && (I_Band || R_Band || K_Band || numerical
band spec.)))

This should select suitable DataSets whether or not they have a detailed
numerical description of the
wavelength coverage (ideally all should have but this may take a while to
implement) - or which
already contain Colour information. In the case of e.g. K/R colour, I
presume this would be classified
as both IR and Optical.

From - Wed Apr 30 18:19:50 2003
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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: "'IVOA Registry mailing list'" <registry@ivoa.net>, <dm@ivoa.net>
Subject: RE: RWP04: Registry Replication
Date: Wed, 30 Apr 2003 17:17:37 +0100
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<<Type of services: >>
<<Type of objects: >>

I don't think Keith is trying to represent himself as an expert on
astronomy: his example is generic. For AstroGrid, we're defining a narrow
set of parameters that can go into a registry query. 

<<Who's coming up with things like a standard list of object types ?>>

For IVOA, we need to define those parameters: that is the job of Rwp03:
  http://www.ivoa.net/twiki/bin/view/IVOA/IVOARegWp03

Cheers,
Tony. 


-----Original Message-----
From: amicol@eso.org [mailto:amicol@eso.org] On Behalf Of Alberto Micol
Sent: 30 April 2003 12:18
To: Keith Noddle
Cc: IVOA Registry mailing list; dm@ivoa.net
Subject: Re: RWP04: Registry Replication


SELECT * FROM REGISTRY WHERE 
   ( 
      TYPE="white dwarf star" AND 
      (WAVELENGTH="optical" OR WAVELENGTH="uv") AND 
      (KEYWORD="BPM 16274" OR 
         KEYWORD="GD 50" OR 
         KEYWORD="HST photometric standards" 
      ) 
   ) 
then one way of presenting this in XML is shown ... etc

Dear Keith, 
  
Type of services: 
   The first problem I have is that the query does not esplicitly 
   defines what type of services you want to identify in the registry. 
   I think a SERVICE_TYPE is required. It could take some values 
   like "catalogue browser", "data archive", "documentation", etc. 
   If someone is interested in ANY service type, then the query should 
   explicit that with a constraint like: 
       SERVICE_TYPE="ANY" 
Type of objects: 
   You use the constraint TYPE="white dwarf star" 
   This is not a service_type, but specifies what class of objects the user 
   is interested in. It should be probably called OBJECT_TYPE. 
   The main problem here is in the value: "white dwarf star" 
   How is that going to be used ? 
   Will only resources matching exactly "white dwarf star" be returned ? 
   What if the resource I maintain lists OBJECT_TYPE="white dwarf" ? 
   It will not match ... 
   We have to come up with a standard list, a thesaurus, 
   to homogenise those types! 
   Probably the best thing is to start with the IAU thesaurus 
   http://msowww.anu.edu.au/library/thesaurus/english/ 
   (but I remember other similar efforts like the IUE object class ...). 
Wavelength: 
   Wavelength is another item value you defined. 
   Here the Data Model should intervene with a proper definition both for
the 
   name of the item (I remember a joke by Jonathan McDowell that introduced 
   the FREWAVERGY!), and for the values (optical and uv are ok, but we need 
   to define many more). 
Keyword: 
   As you presented this, it looks like KEYWORD is a generic container, 
   which could take very different values spanning from object names (GD 50)

   to more or less free text (HST photometric standards). 
   Maybe this is too generic ... ? 
   One of the problem I have with the registry is that I do not know 
   in advance whether a service will list a certain characteristic 
   in its metadata, or within the data itself. 
   Example: 
   The "GD 50" white dwarf might be listed in a set of resource keywords, 
   in some other cases it will be a record in a resource (eg an entry 
   in a  catalogue of white dwarfs); 
   in this second case your query will fail, even though the object is to 
   be found in the resource. 
   I described the same problem in the Rwp02 astrovirtel use case for the 
   Distance attribute, where a catalogue might offer the distance as a field

   in its records, or there could be a metadata keyword saying that the
objects 
   in a catalog are all to be found within so many mega parsec. 
Summary: 
My main point here is that the registry must describe things using 
not only a well defined set of keywords, 
but also a well defined set of keyword values! 
Phometric aspects (the Wavelength values): it will be 
the Data Model WG to come up with a proper description and set of values; 
service_types and other service (or resource) specific metadata 
(I mean non-Bob's document for level 0, but other keywords for deeper
levels) 
will be defined by the Registry WG. 
What I do not know is: 
Who's coming up with things like a standard list of object types ? 
Do we need one ? (I think so ... the IAU thesaurus might show the way) 
Alberto 
-- 
Alberto.Micol@eso.org                         Tel: +49 89 32006365
HST Science Archive       ST-ECF              Fax: +49 89 32006480
ESA/RSSD/SN               c/o ESO             Karl Schwarzschild Str.2,
http://archive.eso.org/   No ads, thanks.     Garching bei Muenchen,
http://www.stecf.org/     HTML emails         D-85748 Germany
Keith Noddle wrote: 
Thanks for the feedback Ray - much appreciated! 
I think we're all converging on the model proposed by Tony which, to 
paraphrase Ray, is the full-(specialist/limited)-(source/private) model. 
I think this pretty much satisfies the points raise by Wil and Ray as 
well as meeting most of the useful requirements I originally proposed. 
I'll start work on the design and get something posted on the IVOA Wiki 
for comment - I'm conscious of the need to get a presentation together 
in short order for Cambridge! 
The other major aspect of the RWP04 work is the development of a 
registry query schema. Tony, Elizabeth and I have been working on 
something similar(!) for AstroGrid and whilst we don't yet have schema, 
we have a simple example XML query (below) upon which I would welcome 
everyone's comments. We are looking into XQuery/XPath, but that might 
not be appropriate for the current iteration of AstroGrid. Again, your 
comments would be welcome. 
Keith. 
-- 
Keith Noddle                    Phone:  +44 (0)116 223 1894 
AstroGrid Technical Lead        Fax:    +44 (0)116 252 3311 
Dept of Physics & Astronomy     Mobile: +44 (0)7721 926 461 
University of Leicester         Email:  ktn@star.le.ac.uk 
Leicester, UK   LE1 7RH         Web:    http://www.astrogrid.org 
-------------------------------------------- 
If the query we are trying to satisfy can be expressed in pseudo-SQL as: 
SELECT * FROM <registry> WHERE 
   ( 
      TYPE="white dwarf star" AND 
      (WAVELENGTH="optical" OR WAVELENGTH="uv") AND 
      (KEYWORD="BPM 16274" OR 
         KEYWORD="GD 50" OR 
         KEYWORD="HST photometric standards" 
      ) 
   ) 
then one way of presenting this in XML is shown below 
<query> 
   <selectionSequence> 
      <selection> 
         <item>type</item> 
         <value>white dwarf star</value> 
      </selection> 
      <operator>AND</operator> 
      <selectionSequence> 
         <selection> 
            <item>wavelength</item> 
            <value>optical</value> 
         </selection> 
         <operator>OR</operator> 
         <selection> 
            <item>wavelength</item> 
            <value>uv</value> 
         </selection> 
      </selectionSequence> 
      <operator>AND</operator> 
      <selectionSequence> 
         <selection> 
            <item>keyword</item> 
            <value>BPM 16274</value> 
         </selection> 
         <operator>OR</operforator> 
         <selection> 
            <item>keyword</item> 
            <value>GD 50</value> 
         </selection> 
         <operator>OR</operator> 
         <selection> 
            <item>keyword</item> 
            <value>HST photometric standards</value> 
         </selection> 
      </selectionSequence> 
   </selectionSequence> 
</query> 
This only requires 6 tags and is sufficiently flexible to cope with most 
queries I can think of - but I'm not an astronomer...!


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Dear All,

I just read the dataService metadata document Anita circulated earlier today,
and I have a counter proposal, far from being complete, but trying
to visualise a hierarchical approach whereby the registry would try to
answer a query not in a single step, but by scanning the repository at
different level of complexity and details. Also, I tried to homogenise the
naming convention onto different axes.

I just hope to generate ideas ... (will somebody read it ? Come on, it is not too long!)

Suppose the question is:
which space observatory instrument could provide calibrated
images in both B and V bands with a field of view of at least 2 arcmin,
and a resolution better than 0.2 arcsec ?

I will take the HST/WFPC2 as an example (am I biased ? maybe... )

The process obviously starts with the zero-order which basically contains the
curator information listed in Bob's not-Bob's (BnB's) document.

Only the services surviving the constraint put at that level will be processed
at further levels, and so on and so forth ...

The other levels could go like this:

First Level: (also partly from BnB's document)

Coverage.Spatial   (BOX or Polygon)
Coverage.Spectral  (RADIO - GAMMA)
Coverage.Temporal (Time ranges)
DataType  (image,catalog,spectrum,event list,radio map, etc)

HST example:

HSTECF.Summary.Coverage.Spatial: (J2000,0,360,-90,90), sparse (how do I tell?)
HSTECF.Summary.Coverage.Spectral:            UV, OPTICAL, INFRARED
HSTECF.Summary.Coverage.Temporal:            1990-
HSTECF.Summary.DataType:                     image,spectrum

Notice that different HST archives might offer different or more datatypes
(eg catalogs)


Second Level:

Coverage.Spatial.Resolution  (range: min - max of all possible resolutions )
Coverage.Spatial.Window      (range: min-max of all the Field of Views)

Coverage.Spectral.Resolution (range: min-max of all possible spectral resolution
s)
Coverage.Spectral.Window     (range: min-max of all possible wavelengths )

Coverage.Temporal.Resolution (range: min-max of all possible sampling rates)
Coverage.Temporal.Window     (range: min-max of all possible epochs)

DataType.QualityType  (image/raw, image/calibrated, image/combined,
                       spectrum-2D/raw, spectrum-2D/calibrated,
                       spectrum-1D/raw, spectrum-1D/calibrated,
               catalog/astrometric, catalog/photometric, catalog/calibrated
Subresources: list of subresources

HST example:

HST.Summary.Coverage.Spatial.Resolution:  0.014-0.2 arcsec
HST.Summary.Coverage.Spatial.Window:      0.014 - 340 arcsec
HST.Summary.Coverage.Spectral.Resolution: ??? - ??? min-max sp.resol.across instr.
HST.Summary.Coverage.Spectral.Window:     90-1200 nm (???)
HST.Summary.Coverage.Temporal.Resolution: 0-1day (useful for HST ???)
HST.Summary.Coverage.Temporal.Window:     1990-
HST.Summary.DataType.QualityType:     image/raw, image/calibrated, image/combined,
                                      spectrum/raw/2D, spectrum/calibrated/2D,
                                      spectrum/calibrated/1D



SubResources  WFPC2, STIS, NICMOS, ACS, FOS, GHRS, FOC, WFPC, HSP, FGS

Again, not all the HST data centres offer the same kind of QualityTypes
or Subresources. All this is Curator-specialised.


Third Level:

This level is no longer a Summary level for the resource itself
At this point we need to specialise per SubResource.
In the case of HST this means that here we start describing Instruments
and their characteristics

Instrument.Name                          (eg, WFPC2)
WFPC2.Coverage.Spatial          a HTM is probably needed for a very sparse resource
WFPC2.Coverage.Spatial.Resolution   (0.05 - 0.199) <- min-max wfpc2 pix.scales
WFPC2.Coverage.Spatial.Window       (40x40 - 318x318 sq.arcsec)
WFPC2.Coverage.Spectral.Resolution  (2.15 - 665.42 nm)
WFPC2.Coverage.Spectral.Window      (98.1 - 1011 nm)
WFPC2.Coverage.Temporal.Resolution  (0.11 - 192400 sec) min - max exptimes
WFPC2.Coverage.Temporal.Window      (1993.95 - )
WFPC2.DataType: image/raw, image/calibrated, image/combined, image/polarimetry
WFPC2.SubResources: Filter, Detector, FocalPlane

Fourth Level,

WFPC2.Filter.Name
WFPC2.Filter.Lambda.Central
WFPC2.Filter.Lambda.FWHM
WFPC2.Filter.Lambda.Min
WFPC2.Filter.Lambda.Max
WFPC2.Filter.RedLeak (yes/no)
WFPC2.Filter.TransmissionCurve
WFPC2.Filter.ZeroPoint

WFPC2.Detector.Name
WFPC2.Detector.PixelSize(x,y)
WFPC2.Detector.Dimension(x,y)
WFPC2.FocalPlane. etc etc etc


This should be enough to easily answer that WFPC2 provides the necessary
filter bands, resolution and field of view.

As said, this is not thoroughly thought through
But I hope it generates waves ...

Alberto

--------------D188E4F380A97FDE9E42D378
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Content-Transfer-Encoding: 7bit

<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
&nbsp;
<br>Dear All,
<p>I just read the dataService metadata document Anita circulated earlier
today,
<br>and I have a counter proposal, far from being complete, but trying
<br>to visualise a hierarchical approach whereby the registry would try
to
<br>answer a query not in a single step, but by scanning the repository
at
<br>different level of complexity and details. Also, I tried to homogenise
the
<br>naming convention onto different axes.
<p>I just hope to generate ideas ... (will somebody read it ? Come on,
it is not too long!)
<p>Suppose the question is:
<br><b>which space observatory instrument could provide calibrated</b>
<br><b>images in both B and V bands with a field of view of at least 2
arcmin,</b>
<br><b>and a resolution better than 0.2 arcsec ?</b><b></b>
<p>I will take the HST/WFPC2 as an example (am I&nbsp;biased ? maybe...
)
<p>The process obviously starts with the zero-order which basically contains
the
<br>curator information listed in Bob's not-Bob's (BnB's) document.
<p>Only the services surviving the constraint put at that level will be
processed
<br>at further levels, and so on and so forth ...
<p>The other levels could go like this:
<p><tt><b>First Level: </b>(also partly from BnB's document)</tt><tt></tt>
<p><tt>Coverage.Spatial&nbsp;&nbsp; (BOX or Polygon)</tt>
<br><tt>Coverage.Spectral&nbsp; (RADIO - GAMMA)</tt>
<br><tt>Coverage.Temporal (Time ranges)</tt>
<br><tt>DataType&nbsp; (image,catalog,spectrum,event list,radio map, etc)</tt><tt></tt>
<p><tt>HST example:</tt><tt></tt>
<p><tt>HSTECF.Summary.Coverage.Spatial: (J2000,0,360,-90,90), sparse (how
do I tell?)</tt>
<br><tt>HSTECF.Summary.Coverage.Spectral:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
UV, OPTICAL, INFRARED</tt>
<br><tt>HSTECF.Summary.Coverage.Temporal:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
1990-</tt>
<br><tt>HSTECF.Summary.DataType:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
image,spectrum</tt><tt></tt>
<p><tt>Notice that different HST archives might offer different or more
datatypes</tt>
<br><tt>(eg catalogs)</tt>
<br><tt></tt>&nbsp;<tt></tt>
<p><b><tt>Second Level:</tt></b><tt></tt>
<p><tt>Coverage.Spatial.Resolution&nbsp; (range: min - max of all possible
resolutions )</tt>
<br><tt>Coverage.Spatial.Window&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (range: min-max
of all the Field of Views)</tt><tt></tt>
<p><tt>Coverage.Spectral.Resolution (range: min-max of all possible spectral
resolution</tt>
<br><tt>s)</tt>
<br><tt>Coverage.Spectral.Window&nbsp;&nbsp;&nbsp;&nbsp; (range: min-max
of all possible wavelengths )</tt><tt></tt>
<p><tt>Coverage.Temporal.Resolution (range: min-max of all possible sampling
rates)</tt>
<br><tt>Coverage.Temporal.Window&nbsp;&nbsp;&nbsp;&nbsp; (range: min-max
of all possible epochs)</tt><tt></tt>
<p><tt>DataType.QualityType&nbsp; (image/raw, image/calibrated, image/combined,</tt>
<br><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
spectrum-2D/raw, spectrum-2D/calibrated,</tt>
<br><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
spectrum-1D/raw, spectrum-1D/calibrated,</tt>
<br><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
catalog/astrometric, catalog/photometric, catalog/calibrated</tt>
<br><tt>Subresources: list of subresources</tt><tt></tt>
<p><tt>HST example:</tt><tt></tt>
<p><tt>HST.Summary.Coverage.Spatial.Resolution:&nbsp; 0.014-0.2 arcsec</tt>
<br><tt>HST.Summary.Coverage.Spatial.Window:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
0.014 - 340 arcsec</tt>
<br><tt>HST.Summary.Coverage.Spectral.Resolution: ??? - ??? min-max sp.resol.across
instr.</tt>
<br><tt>HST.Summary.Coverage.Spectral.Window:&nbsp;&nbsp;&nbsp;&nbsp; 90-1200
nm (???)</tt>
<br><tt>HST.Summary.Coverage.Temporal.Resolution: 0-1day (useful for HST
???)</tt>
<br><tt>HST.Summary.Coverage.Temporal.Window:&nbsp;&nbsp;&nbsp;&nbsp; 1990-</tt>
<br><tt>HST.Summary.DataType.QualityType:&nbsp;&nbsp;&nbsp;&nbsp; image/raw,
image/calibrated, image/combined,</tt>
<br><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
spectrum/raw/2D, spectrum/calibrated/2D,</tt>
<br><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
spectrum/calibrated/1D</tt>
<br><tt></tt>&nbsp;
<br><tt></tt>&nbsp;<tt></tt>
<p><tt>SubResources&nbsp; WFPC2, STIS, NICMOS, ACS, FOS, GHRS, FOC, WFPC,
HSP, FGS</tt><tt></tt>
<p><tt>Again, not all the HST data centres offer the same kind of QualityTypes</tt>
<br><tt>or Subresources. All this is Curator-specialised.</tt>
<br><tt></tt>&nbsp;<tt></tt>
<p><b><tt>Third Level:</tt></b><tt></tt>
<p><tt>This level is no longer a Summary level for the resource itself</tt>
<br><tt>At this point we need to specialise per SubResource.</tt>
<br><tt>In the case of HST this means that here we start describing Instruments</tt>
<br><tt>and their characteristics</tt><tt></tt>
<p><tt>Instrument.Name&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
(eg, WFPC2)</tt>
<br><tt>WFPC2.Coverage.Spatial&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
a HTM is probably needed for a very sparse resource</tt>
<br><tt>WFPC2.Coverage.Spatial.Resolution&nbsp;&nbsp; (0.05 - 0.199) &lt;-
min-max wfpc2 pix.scales</tt>
<br><tt>WFPC2.Coverage.Spatial.Window&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
(40x40 - 318x318 sq.arcsec)</tt>
<br><tt>WFPC2.Coverage.Spectral.Resolution&nbsp; (2.15 - 665.42 nm)</tt>
<br><tt>WFPC2.Coverage.Spectral.Window&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (98.1
- 1011 nm)</tt>
<br><tt>WFPC2.Coverage.Temporal.Resolution&nbsp; (0.11 - 192400 sec) min
- max exptimes</tt>
<br><tt>WFPC2.Coverage.Temporal.Window&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (1993.95
- )</tt>
<br><tt>WFPC2.DataType: image/raw, image/calibrated, image/combined, image/polarimetry</tt>
<br><tt>WFPC2.SubResources: Filter, Detector, FocalPlane</tt><tt></tt>
<p><b><tt>Fourth Level,</tt></b><tt></tt>
<p><tt>WFPC2.Filter.Name</tt>
<br><tt>WFPC2.Filter.Lambda.Central</tt>
<br><tt>WFPC2.Filter.Lambda.FWHM</tt>
<br><tt>WFPC2.Filter.Lambda.Min</tt>
<br><tt>WFPC2.Filter.Lambda.Max</tt>
<br><tt>WFPC2.Filter.RedLeak (yes/no)</tt>
<br><tt>WFPC2.Filter.TransmissionCurve</tt>
<br><tt>WFPC2.Filter.ZeroPoint</tt><tt></tt>
<p><tt>WFPC2.Detector.Name</tt>
<br><tt>WFPC2.Detector.PixelSize(x,y)</tt>
<br><tt>WFPC2.Detector.Dimension(x,y)</tt>
<br><tt>WFPC2.FocalPlane. etc etc etc</tt>
<br><tt></tt>&nbsp;<tt></tt>
<p><tt>This should be enough to easily answer that WFPC2 provides the necessary</tt>
<br><tt>filter bands, resolution and field of view.</tt><tt></tt>
<p><tt>As said, this is not thoroughly thought through</tt>
<br><tt>But I hope it generates waves ...</tt><tt></tt>
<p><tt>Alberto</tt>
<pre></pre>
</html>

--------------D188E4F380A97FDE9E42D378--

From - Wed Apr 30 18:49:50 2003
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Date: Wed, 30 Apr 2003 17:32:28 +0100 (BST)
From: Elizabeth Auden <eca@mssl.ucl.ac.uk>
To: "'IVOA Registry mailing list'" <registry@ivoa.net>
Subject: definition of registry
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Does the IVOA have an official (or at least agreed) definition of
"registry"?  If so, what is it? I was asked for a definition by Prof. Len
Culhane, the MSSL lab director.

This is what I have:

Registry: (noun) a dynamically updatable database containing metadata
about and contained by resources available to a grid. A single registry
may be one of a network of mutually queriable registries.

I think I must have been a lawyer in a past life.


Thanks,
Elizabeth



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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: "'IVOA Registry mailing list'" <registry@ivoa.net>
Subject: RE: definition of registry
Date: Wed, 30 Apr 2003 17:56:33 +0100
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> Registry: (noun) a dynamically updatable database containing 
> metadata about and contained by resources available to a 
> grid. A single registry may be one of a network of mutually 
> queriable registries.

What does 'and contained by' mean? 

> I think I must have been a lawyer in a past life.

Nah! 250,000 words too short!

Cheers,
Tony. 

> -----Original Message-----
> From: Elizabeth Auden [mailto:eca@mssl.ucl.ac.uk] 
> Sent: 30 April 2003 17:32
> To: 'IVOA Registry mailing list'
> Subject: definition of registry
> 
> 
> 
> Does the IVOA have an official (or at least agreed) 
> definition of "registry"?  If so, what is it? I was asked for 
> a definition by Prof. Len Culhane, the MSSL lab director.
> 
> This is what I have:
> 
> Registry: (noun) a dynamically updatable database containing 
> metadata about and contained by resources available to a 
> grid. A single registry may be one of a network of mutually 
> queriable registries.
> 
> I think I must have been a lawyer in a past life.
> 
> 
> Thanks,
> Elizabeth
> 
> 
> 

From - Wed Apr 30 19:04:50 2003
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Date: Wed, 30 Apr 2003 12:02:26 -0500 (CDT)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: registry@ivoa.net
Subject: Registry Query Language
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Hi,

A few items to think about with regard to approaching queries to 
registries.

1.  Overlap with VOQL WG:  

    I don't see much difference between searching a registry and any other 
    searchable database.  The main difference, perhaps, is in the 
    metadata you invoke.  Thus, I think it makes sense that Registries 
    should ultimately support the general QL that comes out of the VOQL 
    working group.

    That said, we may need to adopt something early to work with until we 
    have a VOQL.  This experience can provide important input to the VOQL 
    development process.

2.  Metadata vs. QL

    To ensure that the QL adapts well to our evolving metadata model(s), 
    they need to be independent.  That is, the QL syntax must be metadata 
    neutral.  It may place requirements on how the metadata is defined, 
    but it should not care what specifically appears left or right of an 
    equal sign.

    I believe Keith's strawman reflects this.  (This is particularly 
    obvious in the XML version.)

3.  Registry Metadata

    As you know we have a separate WP for this topic.  A general schema 
    for registries is proposed in text form in the RSM document and an XML 
    version based on it is posted at the RWP03 page:  
    http://www.ivoa.net/twiki/bin/view/IVOA/IVOARegWp03.  Other proposals 
    are welcome there.  

    In my mind, what we should concentrate on in RWP03 is the metadata 
    about Resources in particular.  For astronomical related 
    information--which certainly should be included as part a resource 
    description (e.g. coverage)--we should leverage off the data models 
    that come out of the DM WG.  We should not plan to make up our own 
    just for use with registries.  

    For example, in my proposed schema (VOResource), it is intended that 
    the "Coverage/Spatial" node would use elements from the Space-Time 
    Coordinates and Regions schema being developed by Arnold Rots et al.  

4.  XML-based QL vs. SQL vs. XML Query

    The motivation for using an XML-based QL is that it is easier to parse 
    than SQL and XQuery.  In my mind, this is a critical requirement for 
    the general QL because at some point in the chain (most sensibly at 
    the data provider's site), catalog queries must be transformed into 
    a native format.  It is not just a matter of transforming to SQL; the 
    metadata itself must be transformed to the local schema.  (A definite
    requirement of an XML-based QL would be that it is easily transformed 
    into SQL and XQuery.)

    This parsing requirement is less critical, I think, for registries, 
    but it could still be.  It all depends on how the registry data is 
    actually stored internally (which we don't want to mandate!).  Still, 
    in the short term, XML Query is not a bad choice, especially if we 
    plan to use an OO/XML-based metadata model (which I think we should).

    Keep in mind: straight SQL is only straight-forward if the  schema used 
    in the query matches what is actually in the (relational!) database.  
    If you can't guarantee this, you have to parse the SQL.  
 
cheers,
Ray


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From: Andrew Lawrence <al@roe.ac.uk>
To: "'ael@star.le.ac.uk'" <ael@star.le.ac.uk>,
   "'IVOA Registry mailing list'" <registry@ivoa.net>
Subject: RE: definition of registry
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Q: how do you tell when a lawyer is lying ?
A : their lips are moving

>-----Original Message-----
>From: Tony Linde [mailto:ael@star.le.ac.uk] 
>Sent: Wednesday, April 30, 2003 17:57
>To: 'IVOA Registry mailing list'
>Subject: RE: definition of registry
>
>
>> Registry: (noun) a dynamically updatable database containing 
>> metadata about and contained by resources available to a 
>> grid. A single registry may be one of a network of mutually 
>> queriable registries.
>
>What does 'and contained by' mean? 
>
>> I think I must have been a lawyer in a past life.
>
>Nah! 250,000 words too short!
>
>Cheers,
>Tony. 
>
>> -----Original Message-----
>> From: Elizabeth Auden [mailto:eca@mssl.ucl.ac.uk] 
>> Sent: 30 April 2003 17:32
>> To: 'IVOA Registry mailing list'
>> Subject: definition of registry
>> 
>> 
>> 
>> Does the IVOA have an official (or at least agreed) 
>> definition of "registry"?  If so, what is it? I was asked for 
>> a definition by Prof. Len Culhane, the MSSL lab director.
>> 
>> This is what I have:
>> 
>> Registry: (noun) a dynamically updatable database containing 
>> metadata about and contained by resources available to a 
>> grid. A single registry may be one of a network of mutually 
>> queriable registries.
>> 
>> I think I must have been a lawyer in a past life.
>> 
>> 
>> Thanks,
>> Elizabeth
>> 
>> 
>> 
>
>

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From: Anita Richards <amsr@jb.man.ac.uk>
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Dear Alberto,

>
> I just read the dataService metadata document Anita circulated earlier today,
> and I have a counter proposal, far from being complete, but trying
> to visualise a hierarchical approach whereby the registry would try to
> answer a query not in a single step, but by scanning the repository at
> different level of complexity and details.

I don't think this is a contradictory 'counter proposal', but a more
advanced example of what I am groping towards.  The only place we may
differ (apart from details like when we use indexing and when we use
compex shapes to describe abgular coverage) is, how many layers do we
impliment when, and how do we decide what to put in them?  I am arguing
(influenced by discussions in AstroGrid) that we should start with two
layers based on information held in the Registry - the lower or more
detailed layer is the UCDs for each data set, and the top or more general
layer is the ResourceMetadata which the VO condenses from each data set
(or we ask curators to supply, but it would need checking) - hence very
simple and limited initially.

Then Alberto's heirachy could grow out of inadequacies which emerge in the
top layer during testing against science cases.

> Also, I tried to homogenise the naming convention onto different axes.
That makes sense up to a point but we should not pursue consistency so far
that we abandon useful conventions, for example it makes sense to
express spectral resolution as a dimensionless fraction for line
observations, but angular resolution needs units.


> HSTECF.Summary.Coverage.Spatial: (J2000,0,360,-90,90), sparse (how do I
tell?)

Could be by fraction of the sky covered (for imageable data) or sources
per square degree (for catalogue lists).  And eventually by indexing? What
do people outside AstroGrid think of that?

Please can we use 'Angular' instead of 'Spatial'? I know I am a pedant,
but space is wot I measure in metres with a ruler, angles are wot I
measure with a protractor in degrees....

....................

>
> Third Level:
>
> This level is no longer a Summary level for the resource itself
> At this point we need to specialise per SubResource.
> In the case of HST this means that here we start describing Instruments
> and their characteristics

How will this be stored?  Will these in fact be separate datasets - e.g. a
datset containing a list of HST observations (your 4th level?) and a
dataset describing the instruments, as here in your 3rd level? And other
datasets e.g. details of astronometric and photometric reference stars/QSO
etc.  So maybe they are actually on the same level, but we need to
cross-reference datasets to be able to make full use of the data?  The
reason I see it like this, is that now we are at the level where I think
that the data provider, rather than the VO, has the main responsibility
for maintaining the data set contents and their description, for example
if a more accurate position or proper motion is established for an
astrometric standard.

best wishes

Anita

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Date: Wed, 30 Apr 2003 18:06:32 +0100 (BST)
From: Elizabeth Auden <eca@mssl.ucl.ac.uk>
To: Tony Linde <ael@star.le.ac.uk>
cc: "'IVOA Registry mailing list'" <registry@ivoa.net>
Subject: RE: definition of registry
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> > Registry: (noun) a dynamically updatable database containing
> > metadata about and contained by resources available to a
> > grid. A single registry may be one of a network of mutually
> > queriable registries.
>
> What does 'and contained by' mean?

Metadata "about" resources: basic and curation metadata (id, name, title,
contact, location, etc)

Metadata "contained by" resources: metadata contained in the data archive,
data processor, data storage, etc.  This is the dreaded "metadataFormat".
If the resource were a star catalogue, the "contained by" metadata would
be ramax, coordinates, wavelength, magnitude, etc.  I would really like a
better way to express this concept.

cheers,
Elizabeth


From - Wed Apr 30 19:39:51 2003
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To: "Elizabeth Auden" <eca@mssl.ucl.ac.uk>, "Tony Linde" <ael@star.le.ac.uk>
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Subject: Re: definition of registry
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Don't let the lawyer jokes get to you, Elizabeth!

Is it worth making a distinction between "about" and "contained by"?
"Metadata" is information about other information.  And do we need to
restrict ourselves to resources "available to a grid"?  Or do we assume that
any resource on the Internet is also on the grid?

I guess I would suggest

    A registry is a dynamic database of metadata describing a set of
Internet-available resources.

Whether there is a network of registries and what their relationships are is
an implementation issue, not something inherent in the definition.

One could go on to describe a bit more about the use of the registry, to
elaborate:

    A registry is used to identify and locate resources satisfying
user-specified criteria, and to direct more detailed information requests to
the relevant services.

Helpful?

No more lawyer jokes, Andy!

Cheers,
Bob


----- Original Message -----
From: "Elizabeth Auden" <eca@mssl.ucl.ac.uk>
To: "Tony Linde" <ael@star.le.ac.uk>
Cc: "'IVOA Registry mailing list'" <registry@ivoa.net>
Sent: Wednesday, April 30, 2003 1:06 PM
Subject: RE: definition of registry


> > > Registry: (noun) a dynamically updatable database containing
> > > metadata about and contained by resources available to a
> > > grid. A single registry may be one of a network of mutually
> > > queriable registries.
> >
> > What does 'and contained by' mean?
>
> Metadata "about" resources: basic and curation metadata (id, name, title,
> contact, location, etc)
>
> Metadata "contained by" resources: metadata contained in the data archive,
> data processor, data storage, etc.  This is the dreaded "metadataFormat".
> If the resource were a star catalogue, the "contained by" metadata would
> be ramax, coordinates, wavelength, magnitude, etc.  I would really like a
> better way to express this concept.
>
> cheers,
> Elizabeth
>
>
>

From - Wed Apr 30 19:54:51 2003
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From: Patrick Dowler <patrick.dowler@nrc-cnrc.gc.ca>
Organization: National Research Council Canada
To: registry@ivoa.net
Subject: Re: definition of registry
Date: Wed, 30 Apr 2003 10:52:52 -0700
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On April 30, 2003 10:34, Robert Hanisch wrote:
>     A registry is used to identify and locate resources satisfying
> user-specified criteria, and to direct more detailed information
> requests to
> the relevant services.

On April 30, 2003 10:02, Ray Plante wrote:
> A few items to think about with regard to approaching queries to
> registries.
>
> 1.  Overlap with VOQL WG:

These two points together indicate something that - frankly - scares me about
the current thinking in the registry WG: there is way too much detail at the
registry level that really belongs in the service(s) themselves. 

As Bob said, "direct more detailed information requests to the relevant 
services". The goal is the registry is to find those relevant services too 
which is is worth sending the real query. That doesn't men that every one of 
those services will actually have results to provide. It means they might
have results. 

If you think about services in a very simplistic key=value sense (just for
elucidation of my point - clearly insufficient) then the service is able to 
answer questions like "how many key1=X do you have?" while the registry
should do no more than "how many services know about key1?" The registry 
should have no concept of what the values are in any one service.

>From a practical point of view, it is very simple for a client to send the 
same query (i.e. VOQL) to many services that know about "key1" and 
happily deal with the fact that most return 0 things. It is trivial in general 
for a service to process queries that return 0 things.

So, lets avoid overlap between registry and QL. We don't need to implement the 
whole VO in the registry, after all :-)


-- 
Patrick Dowler
Tel/Tél: (250) 363-6914 | Fax: (250) 363-0045
Canadian Astronomy Data Centre    | Centre canadien de donnees astronomiques
National Research Council Canada  | Conseil national de recherches Canada
Government of Canada                   | Gouvernement du Canada
5071 West Saanich Road                | 5071, chemin West Saanich
Victoria, BC                                   | Victoria (C.-B.)

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Date: Wed, 30 Apr 2003 18:43:12 +0100 (BST)
From: Elizabeth Auden <eca@mssl.ucl.ac.uk>
To: Robert Hanisch <hanisch@stsci.edu>
cc: Tony Linde <ael@star.le.ac.uk>,
   "'IVOA Registry mailing list'" <registry@ivoa.net>
Subject: Re: definition of registry
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Hi Bob,

> Don't let the lawyer jokes get to you, Elizabeth!

It's okay, I've got one too:

Q: Why won't sharks attack lawyers?
A: Professional courtesy.

And now back to registry definitions:

>     A registry is a dynamic database of metadata describing a set of
> Internet-available resources. A registry is used to identify and locate
> resources satisfying user-specified criteria, and to direct more
> detailed information requests to the relevant services.
>
> Helpful?

Very - thanks, Bob.  This is the definition that I'll pass on to Len if
there are no strenuous objections.

cheers,
Elizabeth


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Subject: ranges
Date: Wed, 30 Apr 2003 14:00:41 -0400
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Having finally caught up on my e-mail, there is in my mind one major issue I
would like some additional discussion on prior to the interop workshop.
Elizabeth's AstroGrid prototype registry, Anita's document on frequency
coverage, and Bob Jackson's previous work on telescope and instrument
capabilities, all use range specifications for quantities such as bandpass
coverage.  The RSM V.6 document generally does not do this.  In fact, I have
a bit reluctant to put in specific metadata elements for upper and lower
limits, as they are often poorly defined (what are the exact wavelength
limits for various optical filters?), I am not sure they will be terribly
helpful in locating data of interest, and they increase the burden on the
data provider in registering their resources.  For example, I know that HST
observations can be described as (near) IR, optical, and UV, but it would be
non-trivial to say exactly what the lower and upper wavelength limits would
be.  Moreover, if I were to select particular limits, say at lambda max of
9000 angstroms, and someone submits a query to the registry looking for data
at 9005 angstroms, would we want to steer them away from HST?  I don't think
so.

Of course, one could collect metadata for the registry with the range
information, and then filter queries so that requests are interpreted with
fuzzy boundaries.  In other words, one can also convolve the metadata with a
blurring function, if you will (my image restoration background is now
showing), but deconvolution is an inverse problem and much harder.

This all argues in favor of Elizabeth's, Anita's, and Bob J's approaches.  I
am just not yet convinced that we will really use metadata in the registry
at this level of detail, and thus am not yet convinced that we should make
resource and service providers provide it, especially when it is ambiguous
to start.

Eager to hear people's comments.  I would like to come to Cambridge with V7
of the RSM document that reflects the majority opinion.

Bob

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From: Arnold Rots <arots@head-cfa.cfa.harvard.edu>
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Subject: Space-Time Coordinate metadata schemata
To: metadata@us-vo.org, registry@ivoa.net
Date: Wed, 30 Apr 2003 18:34:40 -0400 (EDT)
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The Space-Time Coordinate metadata schemeas are finally finished:

	http://hea-www.harvard.edu/~arots/nvometa/stc.xsd
	http://hea-www.harvard.edu/~arots/nvometa/coords.xsd
	http://hea-www.harvard.edu/~arots/nvometa/region.xsd

explanation at:

	http://hea-www.harvard.edu/~arots/nvometa/SpaceTime.html

documentation at:

	http://hea-www.harvard.edu/~arots/nvometa/stc.doc
	http://hea-www.harvard.edu/~arots/nvometa/stc.pdf

Later this week I will expand the html explanation a little more.
This does include the long-awaited region specification.

Enjoy!

  - Arnold

--------------------------------------------------------------------------
Arnold H. Rots                                Chandra X-ray Science Center
Smithsonian Astrophysical Observatory                tel:  +1 617 496 7701
60 Garden Street, MS 67                              fax:  +1 617 495 7356
Cambridge, MA 02138                             arots@head-cfa.harvard.edu
USA                                     http://hea-www.harvard.edu/~arots/
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From - Thu May  1 05:09:51 2003
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Date: Thu, 01 May 2003 12:04:38 +0900
To: "'IVOA Registry mailing list'" <registry@ivoa.net>
From: Masatoshi OHISHI <masatoshi.ohishi@nao.ac.jp>
Subject: RE: RWP04: Registry Replication
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Hi Tony,

Thank you for your comment.

At 17:10 03/04/30 +0100, Tony Linde wrote:
> > Our JVO prototype is now running, and uses SQL to interface
>
>We're restricting the AstroGrid queries in the first instance to what can be
>done with drop-down boxes, checkboxes etc, so it is easier to construct the
>query in xml, pass it to whatever needs to use it (resource registry, data
>source) and let it decode to the appropriate form (SQL in the case of
>rdbms).

I need to add another one. In the JVO prototype, we prepare and input
a query described by our JVOQL onto a user interface running on a PC.
The user interface program, then, sends the query to another machine,
the JVO Controller, and the Controller parses the query into individual
SQLs before passing them to each database servsers.

As you already found, it is difficult to ask general users to describe
their queries by the JVOQL / SQL/ or whatever, and we are now
developing a GUI similar to yours.

Therefore our approaches are almost similar, with a minor difference on
language to describe query.

Cheers,

    Masatoshi 


From - Thu May  1 10:39:51 2003
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From: Clive Page <cgp@star.le.ac.uk>
To: "'IVOA Registry mailing list'" <registry@ivoa.net>
Subject: Re: ranges
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On Wed, 30 Apr 2003, Robert Hanisch wrote:

> Having finally caught up on my e-mail, there is in my mind one major issue I
> would like some additional discussion on prior to the interop workshop.
> Elizabeth's AstroGrid prototype registry, Anita's document on frequency
> coverage, and Bob Jackson's previous work on telescope and instrument
> capabilities, all use range specifications for quantities such as bandpass
> coverage.  The RSM V.6 document generally does not do this.  In fact, I have
> a bit reluctant to put in specific metadata elements for upper and lower
> limits, as they are often poorly defined (what are the exact wavelength
> limits for various optical filters?), I am not sure they will be terribly
> helpful in locating data of interest, and they increase the burden on the
> data provider in registering their resources.  For example, I know that HST
> observations can be described as (near) IR, optical, and UV, but it would be
> non-trivial to say exactly what the lower and upper wavelength limits would
> be.  Moreover, if I were to select particular limits, say at lambda max of
> 9000 angstroms, and someone submits a query to the registry looking for data
> at 9005 angstroms, would we want to steer them away from HST?  I don't think
> so.

Bob et al.

Since I have argued in favour of the spectral ranges approach in the past,
maybe I can explain it, and defend it somewhat.

The main point of the Registry is to make every query a wanted query
(sorry about the political overtones of that phrase).  In your example the
important thing is to avoid the HST archive being pestered with queries
from folk who want, say, radio or x-ray data, which it cannot provide.
If we don't do this, every query will be sent to potentially hundreds of
sites.  The way to ensure that the HST archive _always_ gets queries it
_can_ help with, and avoids _most_ of the queries to which it cannot
respond, is for the HST archive's declared spectral range to be all
inclusive.  If there is any possibility that the HST archive could help
somone wanting data at 9005 angstroms, then the limits should be declared
to encompass this wavelength, and not just go out to 9000 angstroms.
There must be _some_ wavelength completely outside the HST's band which
can be used to ensure that radio/millimetre-wave/XUV/Xray/Gamma-raw
queries do not get passed on, but all others do.

The most obvious alternative would be to have a simple enumerated list of
wavebands, with each archive declaring which named band or bands it
covers.  This would be much simpler to set up, but somewhat less selective
in practice.  Maybe this doesn't matter much, and we should adopt it as an
interim solution?  The main problem I foresee is that we are likely to get
into interminable arguments over where the boundaries are between bands,
and how many named bands there should be.  If we distinguish between soft
and hard x-rays, what about medium-energy x-rays, don't they deserve their
own enumeration value?  And what about UV and IR etc.: do we just call
them soft/hard or near/far, or go for named bands (J, K, L etc)?  If I
thought that the community could agree on this in a finite time, I'd be in
favour of it, at least in the interim.

The other extreme is to have some method of registering the spectral
coverage of each archive or resource in detail.  Here I foresee that
debates on which units to use (MHz, Angstroms, eV?) and choice of
resolution might go on for years.  It's also hard to see how all this
information could be extracted in the first place, nor how it could be
stored in a Registry of modest size and complexity, unless the relative
resolution were rather low (in which case it doesn't provide much more
selectivity than the spectral ranges approach).

On balance, it seemed to me that the spectral range approach was a
reasonable compromise betwen these two extremes.


-- 
Clive Page,
Dept of Physics & Astronomy,
University of Leicester,    Tel +44 116 252 3551
Leicester, LE1 7RH,  U.K.   Fax +44 116 252 3311

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Date: Thu, 1 May 2003 10:46:30 +0100 (BST)
From: Elizabeth Auden <eca@mssl.ucl.ac.uk>
To: Robert Hanisch <rjhanisch@worldnet.att.net>
cc: "'IVOA Registry mailing list'" <registry@ivoa.net>
Subject: Re: ranges
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Hi all,

> capabilities, all use range specifications for quantities such as bandpass
> coverage.  The RSM V.6 document generally does not do this.  In fact, I have
> a bit reluctant to put in specific metadata elements for upper and lower
> limits, as they are often poorly defined (what are the exact wavelength
> limits for various optical filters?), I am not sure they will be terribly
> helpful in locating data of interest, and they increase the burden on the
> data provider in registering their resources.

I think extreme fuzziness would be a good approach.

I've just talked to some of the MSSL x-ray astronomers, and one of them
brought up an interesting complication.  In a recent XMM-Newton proposal,
they had to define ranges in terms of both electronVolts and angstroms for
the same object being observed on the same satellite - just in two
different intstruments.  So, whatever "wavelength" conveys in the registry
standards, we should make sure that it can cover length, frequency, and
energy.  Even using words like "soft x-ray" as a range could be misleading
since the range of soft x-rays can be 0.1 - 2 keV (soft for extragalactic
observations) or 2 - 10 keV (soft for x-ray binaries).

> non-trivial to say exactly what the lower and upper wavelength limits would
> be.  Moreover, if I were to select particular limits, say at lambda max of
> 9000 angstroms, and someone submits a query to the registry looking for data
> at 9005 angstroms, would we want to steer them away from HST?  I don't think
> so.

The best I can come up with after only one cup of coffee is to suggest
that we have wavelength ranges that are as broad as possible (for example,
"soft x-ray = 0.1 - 10 keV), and allow a toggle for users to say "+/- 0.5
keV" or similar.  That way, a query for 8000 - 9000 angstroms +/- 100
angstroms would still include HST at 9005 angstroms.

My thought on this is that it's better for the registry to return too much
data rather than too little; the user can always narrow down the query.

cheers,
Elizabeth


From - Thu May  1 12:44:51 2003
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Subject: Re: definition of registry
From: Keith Noddle <ktn@star.le.ac.uk>
To: Patrick Dowler <patrick.dowler@nrc-cnrc.gc.ca>
Cc: registry@ivoa.net
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Hi Patrick,

On Wed, 2003-04-30 at 18:52, Patrick Dowler wrote:
> On April 30, 2003 10:34, Robert Hanisch wrote:
> >     A registry is used to identify and locate resources satisfying
> > user-specified criteria, and to direct more detailed information
> > requests to
> > the relevant services.
> 
> On April 30, 2003 10:02, Ray Plante wrote:
> > A few items to think about with regard to approaching queries to
> > registries.
> >
> > 1.  Overlap with VOQL WG:
> 
> These two points together indicate something that - frankly - scares me about
> the current thinking in the registry WG: there is way too much detail at the
> registry level that really belongs in the service(s) themselves. 
I'm not sure I follow. If I understand correctly, Ray is suggesting the
Query Languages align where possible, not the data (or metadata) they
are querying.

> 
> As Bob said, "direct more detailed information requests to the relevant 
> services". The goal is the registry is to find those relevant services too 
> which is is worth sending the real query. That doesn't men that every one of 
> those services will actually have results to provide. It means they might
> have results. 

> If you think about services in a very simplistic key=value sense (just for
> elucidation of my point - clearly insufficient) then the service is able to 
> answer questions like "how many key1=X do you have?" while the registry
> should do no more than "how many services know about key1?" The registry 
> should have no concept of what the values are in any one service.
> 
No disagreement here. The most we can expect of a registry is that it
says a resource DOES NOT meet the requirement. To do that with any
useful differentiation implies the registry must have a reasonably
complete description of the resources, otherwise queries end up getting
sent to all and sundry and the purpose of the registry is defeated. The
goal should be that the registry limits as far as possible unnecessary
querying of (use of?) resources whilst itself maintaining the minimum 
metadata about those resources. Having said that, the registry is also a
publication mechanism and resources need to able to "advertise"
themselves through the registry.

Some of the AstroGrid people have been further refining the XML query
syntax and at the risk of making this another long email, below is the
(paraphrased) latest thinking.

Keith.

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

Picking up from the previous proposal, if the 'and' and 'or' operators
are 'container' elements, the query becomes simpler, and more
human-readable.

i.e.

SELECT * FROM <registry> WHERE 
   (
      TYPE="white dwarf star" AND 
      (WAVELENGTH="optical" OR WAVELENGTH="uv") AND 
      (KEYWORD="BPM 16274" OR 
         KEYWORD="GD 50" OR 
         KEYWORD="HST photometric standards"
      )
   )

becomes:

   SELECT type, coverage, format FROM <registry> WHERE 
      (
      TYPE="white dwarf star"
      AND
         (
         WAVELENGTH="optical"
         OR
         WAVELENGTH="uv"
         )
      AND 
         (
         KEYWORD="BPM 16274"
         OR
         KEYWORD="GD 50"
         OR
         KEYWORD="HST photometric standards"
         )
      )

(note the addition of fields in the SELECT statement)

If the default operation is AND, this leads to an example query which looks like:

   <query>
      <fields>
         <field path="type"/>
         <field path="coverage"/>
         <field path="format//*"/>
      </fields>
      <criteria>
         <field path="type" oper="EQUALS">white dwarf star</field>
         <field path="instrument/type" oper="EQUALS">patrol</field>
         <or>
            <field path="wavelength" oper="EQUALS">optical</field>
            <field path="wavelength" oper="EQUALS">uv</field>
         </or>
         <or>
            <field path="keyword" oper="EQUALS">BPM 16274</field>
            <field path="keyword" oper="EQUALS">GD 50</field>
            <field path="keyword" oper="EQUALS">HST photometric standards</field>
         </or>
      </criteria>
   </query>

-- 

Keith Noddle			Phone:  +44 (0)116 223 1894
AstroGrid Technical Lead	Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy	Mobile: +44 (0)7721 926 461
University of Leicester		Email:  ktn@star.le.ac.uk
Leicester, UK   LE1 7RH		Web:    http://www.astrogrid.org

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Date: Thu, 01 May 2003 09:09:37 -0600
From: rjackson@nmcourts.com (Robert E. Jackson)
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Subject: In Praise of Ranges AND Resolutions
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Providing numeric ranges for Wavelength/Energy coverages
has the following benefits:

A query with ranges will return fewer hits than a query
without ranges.  Someone, somewhere will have to filter
out the hits which are not of interest.  If the hits
are filtered out before the actual resource is queried,
then resource providers will not have their cpu cycles
eaten up in returning data not of interest.  Better for
the user and better for the resource provider.

Having a standardized range specification at the top level
eliminates the need for the user to learn how each resource
provider specifies the range.  Better for the user.

Admittedly there is a cost to providing the range.  But, the range
can be as simple as two floating point numbers in some
standardized units, e.g., microns.  The user interface could
provide the necessary translation to other units, e.g., eV.

IMHO, the benefits of the user not having to sift through
undesired data are well worth the small cost of providing two numbers.

Perhaps as important as providing ranges is providing resolutions.
A user wanting optical images may not want to sift through all the
data provided by the LINEAR survey to get at an HST/ACS image.
A user wanting spectral data may not want to sift through the data
from an objective prism survey to get at the data from an echelle
spectrograph.

As an analogy, query Google for 'hanisch' and you get 53700 hits.
Query Google for 'hanisch AND bob AND stsci AND virtual' and you
get 132 hits.

Bob Jackson

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From: Elizabeth Auden <eca@mssl.ucl.ac.uk>
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Subject: Re: In Praise of Ranges AND Resolutions
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> As an analogy, query Google for 'hanisch' and you get 53700 hits.
> Query Google for 'hanisch AND bob AND stsci AND virtual' and you
> get 132 hits.

Not that this is particularly relevant, but a google query for "bob"
returns 18,800,000 hits.  :)

Elizabeth


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To: Clive Page <cgp@star.le.ac.uk>,
   "'IVOA Registry mailing list'" <registry@ivoa.net>
Subject: Re: ranges
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PS for dm list: some points below cross the line between registry and dm
and one would expect this...

On May 1, 2003 01:32, Clive Page wrote:
> On Wed, 30 Apr 2003, Robert Hanisch wrote:
> > Elizabeth's AstroGrid prototype registry, Anita's document on frequency
> > coverage, and Bob Jackson's previous work on telescope and instrument
> > capabilities, all use range specifications for quantities such as bandpass
> > coverage.  The RSM V.6 document generally does not do this.  In fact, I 
> > have
> > a bit reluctant to put in specific metadata elements for upper and lower
> > limits, as they are often poorly defined (what are the exact  wavelength
> > limits for various optical filters?),

Surely an interval defines a bandpass better than a name? Of course, something 
even more complicated with the response function et al would be a better 
characterisation but much worse to query against...


Clive responded:
> Since I have argued in favour of the spectral ranges approach in the
> past,
> maybe I can explain it, and defend it somewhat.

In our CVO data model, we characterise every observation by a 
"spectral_bounds" interval. This allows one to ask something like
"how many observations have spectral_bounds that includes 
$my_favourite_wavelength?" etc. The great thing is you are remaining in the 
analog world rather than attaching names to things; in analog, an interval
[300,330] (nm) and [302,332] are almost the same and both would be returned by 
most exact searches (both would be returned by all suitably  fuzzy searches).
But, they are not exaclty the same, so attaching the same name is wrong and
attaching different names leads to picking one or the other OR horrendous 
complexity as we manage 1000s of bandpass names.

Intervals are great to use beacause they can overlap and they are easy to
index and search against, even in large DBs...

> The main point of the Registry is to make every query a wanted query
> (sorry about the political overtones of that phrase).  In your example
> the
> important thing is to avoid the HST archive being pestered with queries
> from folk who want, say, radio or x-ray data, which it cannot provide.
> If we don't do this, every query will be sent to potentially hundreds of
> sites.  The way to ensure that the HST archive _always_ gets queries it
> _can_ help with, and avoids _most_ of the queries to which it cannot
> respond, is for the HST archive's declared spectral range to be all
> inclusive.  If there is any possibility that the HST archive could help
> somone wanting data at 9005 angstroms, then the limits should be
> declared
> to encompass this wavelength, and not just go out to 9000 angstroms.
> There must be _some_ wavelength completely outside the HST's band which
> can be used to ensure that radio/millimetre-wave/XUV/Xray/Gamma-raw
> queries do not get passed on, but all others do.

Exactly. You want the registry to tell you which services have a chance of 
returning something if you submit your query. It doesn't matter so much if
the registry gives you too many services and some of those return nothing
(within reason) but it matters a great deal if the registry fails to tell you 
about a service you might want to try.

> The most obvious alternative would be to have a simple enumerated list
> of
> wavebands, with each archive declaring which named band or bands it
> covers.  This would be much simpler to set up, but somewhat less
> selective
> in practice.  Maybe this doesn't matter much, and we should adopt it as
> an
> interim solution?  The main problem I foresee is that we are likely to
> get
> into interminable arguments over where the boundaries are between bands,
> and how many named bands there should be.  If we distinguish between
> soft
> and hard x-rays, what about medium-energy x-rays, don't they deserve
> their
> own enumeration value?  And what about UV and IR etc.: do we just call
> them soft/hard or near/far, or go for named bands (J, K, L etc)?  If I
> thought that the community could agree on this in a finite time, I'd be
> in
> favour of it, at least in the interim.

Such a list would be very large. 

> The other extreme is to have some method of registering the spectral
> coverage of each archive or resource in detail.  Here I foresee that
> debates on which units to use (MHz, Angstroms, eV?) and choice of
> resolution might go on for years.  It's also hard to see how all this
> information could be extracted in the first place, nor how it could be
> stored in a Registry of modest size and complexity, unless the relative
> resolution were rather low (in which case it doesn't provide much more
> selectivity than the spectral ranges approach).

It is an issue in the data model world already to specify units and for 
services to be able to do some common comversions. In spectral_bounds,
one might chose energy, wavelength, or frequency (all usd in different 
regimes). Internally, a service can pick one and do conversions as long as
the query declares what units their constants are in... by units here I really 
mean one of eV, ?m, Hz and not all the mega- kilo- centi- variants. There 
should be one supported unit for each concept and the variants are a UI issue
(almost a user preference issue). 
 
> On balance, it seemed to me that the spectral range approach was a
> reasonable compromise betwen these two extremes.

Again, it works wonderfully in the data model layer and - necessarily - the
registry should be talking the same langauge as the data model and query
parts.


-- 
Patrick Dowler
Tel/Tél: (250) 363-6914 | Fax: (250) 363-0045
Canadian Astronomy Data Centre    | Centre canadien de donnees astronomiques
National Research Council Canada  | Conseil national de recherches Canada
Government of Canada                   | Gouvernement du Canada
5071 West Saanich Road                | 5071, chemin West Saanich
Victoria, BC                                   | Victoria (C.-B.)

From - Thu May  1 18:49:51 2003
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Another existing example of this, similar to the CVO model is the simple
spectral bandpass model used in SIA.  This defines the following to
characterize a spectral bandpass:

    ID, Unit, RefValue, HiLImit, LoLimit

where the bandpass is characterized numerically (and reliably) by the
reference or characteristic value and the range (high and low limits).
ID is undefined by the standard but is usually the informal filter name
or bandpass name used by the institution that took the data.  Unit is only
allowed to take on a couple of values since this is not a user interface.

This provides both short, familiar names for queries and so forth, plus
a numerical range to rigorously define the bandpass.  This same approach 
could be used for any similar quantity as with CVO.

Doug


> Surely an interval defines a bandpass better than a name? Of course,
> something even more complicated with the response function et al would be
> a better characterisation but much worse to query against...
> 
> 
> Clive responded:
> > Since I have argued in favour of the spectral ranges approach in the
> > past,
> > maybe I can explain it, and defend it somewhat.
> 
> In our CVO data model, we characterise every observation by a 
> "spectral_bounds" interval. This allows one to ask something like
> "how many observations have spectral_bounds that includes 
> $my_favourite_wavelength?" etc. The great thing is you are remaining in the 
> analog world rather than attaching names to things; in analog, an interval
> [300,330] (nm) and [302,332] are almost the same and both would be returned by 
> most exact searches (both would be returned by all suitably  fuzzy searches).
> But, they are not exaclty the same, so attaching the same name is wrong and
> attaching different names leads to picking one or the other OR horrendous 
> complexity as we manage 1000s of bandpass names.
> 
> Intervals are great to use beacause they can overlap and they are easy to
> index and search against, even in large DBs...

From - Fri May  2 14:54:51 2003
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Since VO is imagination, let me be imaginative (I just had a beer for lunch:-)

Let me resurrect the idea of histograms instead of ranges.

Providing access to an histogram might give more precise results
and even provide the likelihood of success for a given query.

After all a range is just the simplest of all histograms (1 inside the range, 0 outside).
It could work for all kind of quantities, wavelengths (1d histo), sky coverage (2d histo), etc.

The implementation is VERY simple, and provides more flexibility.

Example 1:  Wavelengths

 if my dataset (e.g.) offers U and J bands I will have an histogram with 2 non-null bins.

Example 2: Wavelength + resolution

 One could offer a  lookup table for a combination
of wavelengths and wavelength resolutions: a bidimensional
histogram would do the job in a simple way.

Plus, as said, the query coiuld return the probability of success.

Alberto


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I forgot to mention it, but of course the Y-axis of the histogram
would give access to the actual number (actually the percentage) of  records
available in the given bin.

Alberto


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On Fri, 2 May 2003, Alberto Micol wrote:

> Let me resurrect the idea of histograms instead of ranges.

The usual form of histogram has equal-sized bins, which doesn't match very
well with a spectrum which spans an infinite range in theory, and in
practice from, say, 100 MHz to perhaps maybe 100 EHz.

If you want non-equi-spaced bins, then a histogram is surely much the same
as a list of intervals, with the advantage of the latter that the
"bins" do not have to be contiguous.  So for instruments with
sensitivity in two or more non-adjacent bands (e.g. XMM-Newton with
optical and X-ray telescopes) you can simply have two intervals.
Expressing that with a histogram is more messy, but does not really
contain any more information.  But perhaps I mis-understood your proposal
(since I didn't have beer with my lunch, unfortunately).

Regards

-- 
Clive Page,
Dept of Physics & Astronomy,
University of Leicester,    Tel +44 116 252 3551
Leicester, LE1 7RH,  U.K.   Fax +44 116 252 3311

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Yap, I was thinking in terms of non-equi-spaced bins indeed.
And of course one does not need to list those bins where the value is zero.

The fact is that by associating the percentage of records to each range,
then the registry could give back to the user some kind of estimate of the total number
of records s/he will retrieve when posing a given query.  Important for ranking!

For example, suppose that an archive resource metadata contains

1) the bidimensional distribution of the percentage of observations in
    the 2D (Wavelength, Resolution) space:  WRD(w,r)

2) the monodimensional distribution of limiting fluxes LFD(f)

If the user is querying the registry for archives containing data in a certain (user_w, user_r)
wavelength/resolution regime, and reaching at least a certain (user_lf) limiting flux, then
the product of the two distributions

   WRD(user_w,user_r) * LFD( user_lf )

might give an indication of the proability of finding data of the required characteristics.
It is not necessarily the correct number, but such number might be good enough
for ranking the list of resources returned by the registry.

/* Of course the math is a bit simplified here, since there will be the need *
 * of some interpolation, but nothing really difficult nor cpu intensive.    */

Alberto

--
Alberto.Micol@eso.org                         Tel: +49 89 32006365
HST Science Archive       ST-ECF              Fax: +49 89 32006480
ESA/RSSD/SN               c/o ESO             Karl Schwarzschild Str.2,
http://archive.eso.org/   No ads, thanks.     Garching bei Muenchen,
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<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
&nbsp;
<br>Yap, I was thinking in terms of non-equi-spaced bins indeed.
<br>And of course one does not need to list those bins where the value
is zero.
<p>The fact is that by associating the percentage of records to each range,
<br>then the registry could give back to the user some kind of estimate
of the total number
<br>of records s/he will retrieve when posing a given query.&nbsp; Important
for ranking!
<p>For example, suppose that an archive resource metadata contains
<p>1)&nbsp;the bidimensional distribution of the percentage of observations
in
<br>&nbsp;&nbsp;&nbsp; the 2D (Wavelength, Resolution) space:&nbsp; WRD(w,r)
<p>2) the monodimensional distribution of limiting fluxes LFD(f)
<p>If the user is querying the registry for archives containing data in
a certain (user_w, user_r)
<br>wavelength/resolution regime, and reaching at least a certain (user_lf)
limiting flux, then
<br>the product of the two distributions
<p>&nbsp;&nbsp; WRD(user_w,user_r)&nbsp;*&nbsp;LFD( user_lf&nbsp;)
<p>might give an indication of the proability of finding data of the required
characteristics.
<br>It is not necessarily the correct number, but such number might be
good enough
<br>for ranking the list of resources returned by the registry.
<p><tt>/* Of course the math is a bit simplified here, since there will
be the need *</tt>
<br><tt>&nbsp;* of some interpolation, but nothing really difficult nor
cpu intensive.&nbsp;&nbsp;&nbsp; */</tt><tt></tt>
<p>Alberto<tt></tt>
<p><tt>--</tt>
<br><tt>Alberto.Micol@eso.org&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Tel: +49 89 32006365</tt>
<br><tt>HST Science Archive&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ST-ECF&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Fax: +49 89 32006480</tt>
<br><tt>ESA/RSSD/SN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
c/o ESO&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Karl Schwarzschild Str.2,</tt>
<br><tt><A HREF="http://archive.eso.org/">http://archive.eso.org/</A>&nbsp;&nbsp; No ads, thanks.&nbsp;&nbsp;&nbsp;&nbsp;
Garching bei Muenchen,</tt>
<br><tt><A HREF="http://www.stecf.org/">http://www.stecf.org/</A>&nbsp;&nbsp;&nbsp;&nbsp; HTML emails&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
D-85748 Germany</tt>
<br>&nbsp;</html>

--------------8EDBB0700D6A305E94A6DEE5--

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Date: Mon, 5 May 2003 12:11:31 +0100 (BST)
From: David Berry <dsb@ast.man.ac.uk>
To: registry@ivoa.net
cc: arots@head-cfa.cfa.harvard.edu
Subject: Re: Space-Time Coordinate metadata schemata
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Arnold,

Some initial comments on the "Space-Time Coordinate Specification for VO
Metadata" (based on the HTML explanation document):

- Inclusion of Doppler velocities and redshifts: Since these are
basically re-scaled forms of wavelength or frequency, should they not be
included with the wavelength/frequency/energy schema instead of the
space-time schema? Including them in the space-time schema may produce
confusion between these "formal" velocities and "real" velocities.

- Regarding the DopplerReference item, is "LSR" the kinematical or
dynamical LSR (presumably the kinematical, but should support be included
for the dynamical LSR?) See:

http://www.starlink.rl.ac.uk/star/docs/sun67.htx/node227.html

- Planetary coordinate systems are included, but there doesn't seem to be
any mention of solar or STP coordinate systems.

- The planetary coordinate systems seem to be restricted to spherical
longitude/latitude. Is it possible to describe ellipsoidal surfaces?
(e.g. geodetic longitude/latitude instead of geocentric).

- Spherical coordinates seem to be restricted to longitude/latitude
systems. Is it possible to use co-latitude in place of latitude? Some
solar coordinate systems require this.

- Positions within a single physical Domain (such as "the sky", or "the
solar system", or "a spectrum", etc) can in general be described using
many different coordinate systems. It is common for the Mapping between
these coordinate systems to vary with time.  To enable conversion between
such coordinate systems to be possible, it is therefore necessary to
specify a moment in time which defines each coordinate system. I couldn't
find such a time in the CoordsSystem element (although it's quite likely
that I missed it). TimeRefPos seems to be for a different purpose.

- It would be interesting to see a UML diagram (or equivalent) showing a
class hierarchy which could be used to represent the elements of the
schema. Presumably you would need two basic classes to represent the
CoordSystem element, a Domain (representing a physical domain, "SKY",
"TIME", "SOLAR-SYSTEM", "SPECTRUM", "SUN", "JUPITER", etc), and a
CoordinateSytem class which indicates the type of coordinate system
(Cartesian, polar, lon/lat, long/co-lat, etc). Each Domain would
encapsulate a set of named CoordinateSystems each corresponding to a
different coordinate system which can be used to describe positions
within the Domain. For instance, the SkyDomain class (a sub-class of
Domain) would have several LonLatCoordSystems corresponding to FK4, FK5,
ICRF, FK4-NO-E, GAPPT, etc.



Apologies if any of these comments reveal the fact that I am new to this
discussion, and havn't fully grasped the background!

The schema seems to have been specifically tailored to the current needs
of the bulk of astronomical data. How easy would it be to extend the
schema in future to cover other coordinate systems not currently in
demand? For instance, could a cylindrical coordinate system describing
the solar system (or a galaxy) be easily incorporated?


David

From - Tue May  6 10:48:58 2003
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Subject: Re: Space-Time Coordinate metadata schemata
In-Reply-To: <Pine.OSF.4.53.0305051205010.22121@axp0.ast.man.ac.uk>
To: David Berry <dsb@ast.man.ac.uk>
Date: Mon, 5 May 2003 14:46:19 -0400 (EDT)
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Status:   

David,

Thank you very much for your thoughtful comments; they are helpful.
I will need some time to work through them, but here are some quick
comments; if you are going to be in Cambridge, next week, it might be
good to spend some time on this together.

In general, what I tried to do was design a framework that implements
our current needs but is sufficinetly general that it can accommodate
extensions of the kind that you mention, either by extending the lists
of enumerations (or extending elements in general) or by the
CoordRefPosition - which could actually point to a time-dependent table.

I definitely intend to produce some UML-like figures this week.

The Doppler velocities are tricky.  I thought they should be included
since they are so often used in conjunction with spatial coordinates.
I actually started wondering whether the best thing would not be to
include the spectral coordinate with space-time in order to
encapsulate all dependencies.

Cheers,

  - Arnold

David Berry wrote:
> Arnold,
> 
> Some initial comments on the "Space-Time Coordinate Specification for VO
> Metadata" (based on the HTML explanation document):
> 
> - Inclusion of Doppler velocities and redshifts: Since these are
> basically re-scaled forms of wavelength or frequency, should they not be
> included with the wavelength/frequency/energy schema instead of the
> space-time schema? Including them in the space-time schema may produce
> confusion between these "formal" velocities and "real" velocities.
> 
> - Regarding the DopplerReference item, is "LSR" the kinematical or
> dynamical LSR (presumably the kinematical, but should support be included
> for the dynamical LSR?) See:
> 
> http://www.starlink.rl.ac.uk/star/docs/sun67.htx/node227.html
> 
> - Planetary coordinate systems are included, but there doesn't seem to be
> any mention of solar or STP coordinate systems.
> 
> - The planetary coordinate systems seem to be restricted to spherical
> longitude/latitude. Is it possible to describe ellipsoidal surfaces?
> (e.g. geodetic longitude/latitude instead of geocentric).
> 
> - Spherical coordinates seem to be restricted to longitude/latitude
> systems. Is it possible to use co-latitude in place of latitude? Some
> solar coordinate systems require this.
> 
> - Positions within a single physical Domain (such as "the sky", or "the
> solar system", or "a spectrum", etc) can in general be described using
> many different coordinate systems. It is common for the Mapping between
> these coordinate systems to vary with time.  To enable conversion between
> such coordinate systems to be possible, it is therefore necessary to
> specify a moment in time which defines each coordinate system. I couldn't
> find such a time in the CoordsSystem element (although it's quite likely
> that I missed it). TimeRefPos seems to be for a different purpose.
> 
> - It would be interesting to see a UML diagram (or equivalent) showing a
> class hierarchy which could be used to represent the elements of the
> schema. Presumably you would need two basic classes to represent the
> CoordSystem element, a Domain (representing a physical domain, "SKY",
> "TIME", "SOLAR-SYSTEM", "SPECTRUM", "SUN", "JUPITER", etc), and a
> CoordinateSytem class which indicates the type of coordinate system
> (Cartesian, polar, lon/lat, long/co-lat, etc). Each Domain would
> encapsulate a set of named CoordinateSystems each corresponding to a
> different coordinate system which can be used to describe positions
> within the Domain. For instance, the SkyDomain class (a sub-class of
> Domain) would have several LonLatCoordSystems corresponding to FK4, FK5,
> ICRF, FK4-NO-E, GAPPT, etc.
> 
> 
> 
> Apologies if any of these comments reveal the fact that I am new to this
> discussion, and havn't fully grasped the background!
> 
> The schema seems to have been specifically tailored to the current needs
> of the bulk of astronomical data. How easy would it be to extend the
> schema in future to cover other coordinate systems not currently in
> demand? For instance, could a cylindrical coordinate system describing
> the solar system (or a galaxy) be easily incorporated?
> 
> 
> David
> 
--------------------------------------------------------------------------
Arnold H. Rots                                Chandra X-ray Science Center
Smithsonian Astrophysical Observatory                tel:  +1 617 496 7701
60 Garden Street, MS 67                              fax:  +1 617 495 7356
Cambridge, MA 02138                             arots@head-cfa.harvard.edu
USA                                     http://hea-www.harvard.edu/~arots/
--------------------------------------------------------------------------

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From: David Berry <dsb@ast.man.ac.uk>
To: Arnold Rots <arots@head-cfa.cfa.harvard.edu>
cc: registry@ivoa.net, arots@head-cfa.cfa.harvard.edu
Subject: Re: Space-Time Coordinate metadata schemata
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Arnold

> Thank you very much for your thoughtful comments; they are helpful.
> I will need some time to work through them, but here are some quick
> comments; if you are going to be in Cambridge, next week, it might be
> good to spend some time on this together.

Yes, I'll be there all week. See you there!

David

From - Wed May  7 13:01:55 2003
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From: David Berry <dsb@ast.man.ac.uk>
To: Arnold Rots <arots@head-cfa.cfa.harvard.edu>
cc: registry@ivoa.net, arots@head-cfa.cfa.harvard.edu
Subject: Re: Space-Time Coordinate metadata schemata
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Status:   

Arnold,
       I've just seen the changes to the explanation document which
describe projections. The approach you are taking in terms of separating
the descriptions of the coordinate systems from the projections seems very
sensible. It gives a clear picture of the inter-relations between
the various coordinate systems. I do not know if you have software yet
which will read and use the XML descriptions you have devised, but either
way, you may be interested in the Starlink AST library which takes an
almost identical approach to the problem of describing WCS (in terms of
providing a collection of coordinate frame classes which can be connected
together using a range of different Mappings). We've been using it now for
about 6 years and it has been very succesful. I'm thinking that it may be
possible to modify AST to understand the sort of XML descriptions you have
produced.

A brief description of AST, together with pointers to the full docs and
source code, is available at

http://www.ast.man.ac.uk/~dsb/ast/ast.html

David

From - Thu May  8 15:51:57 2003
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From: "Tony Linde" <ael@star.le.ac.uk>
To: registry@ivoa.net
Date: Thu, 08 May 2003 14:45:29 +0100
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Subject: RE: Schedule for interop week
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Status:   

Is this still a valid agenda for our bits of the interop meeting next
week? Bob mentioned that he wanted to give a presentation under Rwp03 -
do we want to have these presentations earlier in the day or left to the
post-lunch session?

Do we need to organise anything else for these sessions?

Cheers,
Tony.

> -----Original Message-----
> From: Tony Linde [mailto:ael@star.le.ac.uk] 
> Sent: 28 April 2003 17:25
> To: 'IVOA Registry mailing list'
> Subject: Schedule for interop week
> 
> 
> We need to pull together a schedule for the interoperability 
> week. Pierre has indicated that he wants to give a 
> presentation - does anyone else also want to do this?
> 
> We have all day Wednesday available, though I'll be out 
> during the AVO Exec meeting in the afternoon.
> 
> On Thursday we have 2 hours to present the work package draft 
> documents.
> 
> As a starter for discussion, how about the following:
> 
> Wednesday
> =========
> 09:30		Rwp02: draft specs presentation	Mark
> 09:50		Rwp03: draft specs presentation	Ray
> 10:10		Rwp04: draft specs presentation	Keith
> 
> 10:30 BREAK
> 
> 11:00		Rwp02: discussion				Mark
> 11:30		Rwp03: discussion				Ray
> 12:00		Rwp04: discussion				Keith
> 
> 12:30		Rwp01: presentation & discussion	Tony
> 
> 13:00	LUNCH
> 
> 14:00		Presentations from individuals
> 		 - Pierre
> 		 - ???
> 
> 15:00		Carry on RwpNN discussions		Bob
> 		 to redraft specs
> 
> ??:??	BACK to hotels to rewrite presentations!!
> 
> Thursday
> ========
> 09:00		Rwp01: presentation & questions		Tony
> 09:15		Rwp02: presentation & questions		Mark
> 09:45		Rwp03: presentation & questions		Ray
> 10:15		Rwp04:: presentation & questions		Keith
> 10:45		General feedback & discsussion		Bob
> 
> 
> *PLEASE NOTE: every WP must have distributed their draft 
> specification to the mailing list and posted it onto their 
> wiki page by 12:00 noon Friday 9th May. People should come to 
> the meeting with specific questions, having read the papers.
> 
> How does this sound?
> 
> 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
> 
__
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: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: Tony Linde <ael@star.le.ac.uk>
cc: registry@ivoa.net
Subject: RE: Schedule for interop week
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On Thu, 8 May 2003, Tony Linde wrote:

> Is this still a valid agenda for our bits of the interop meeting next
> week? Bob mentioned that he wanted to give a presentation under Rwp03 -
> do we want to have these presentations earlier in the day or left to the
> post-lunch session?

This looks good to me.  I think it would be good to have Bob's 
presentation earlier in the day as it is something that would form a good 
basis for later discussion.  This could be before or after my 
presentation on a draft spec.

cheers,
Ray

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Subject: RE: Schedule for interop week
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I'll leave it up to the wp leaders to determine who speaks when in their
slots.

Cheers,
Tony.

On Thu, 8 May 2003 09:02:18 -0500 (CDT), "Ray Plante"
<rplante@poplar.ncsa.uiuc.edu> said:
> On Thu, 8 May 2003, Tony Linde wrote:
> 
> > Is this still a valid agenda for our bits of the interop meeting next
> > week? Bob mentioned that he wanted to give a presentation under Rwp03 -
> > do we want to have these presentations earlier in the day or left to the
> > post-lunch session?
> 
> This looks good to me.  I think it would be good to have Bob's 
> presentation earlier in the day as it is something that would form a good 
> basis for later discussion.  This could be before or after my 
> presentation on a draft spec.
> 
> cheers,
> Ray
> 
> 
> 
__
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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Hi Everyone,

Here is the draft Registries Requirements document intended as
a starting point for discussions at next week's Registries WG session
at the Cambridge interoperability meeting.

It tries to cover most of the current issues, with a very draft version
of the requirements, including the draft NVO registries requirements
and use cases.  Discussion in Cambridge should fill this out to
a proper draft requirements document.

It is included in full below, and is also available on
http://www.ivoa.net/twiki/bin/view/IVOA/IVOARegWp02


-Mark.

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

Mark G. Allen
Observatoire de Strasbourg
11 Rue de l'Universite
Strasbourg 67000
FRANCE

email: allen@astro.u-strasbg.fr
phone: +33 3 90 24 24 87
fax:   +33 3 90 24 24 17
-------------------------------


Rwp02 Toward Registry Requirements
===================================
May 09, 2003.


Intro
------
The Registry kick-off meeting, London 19-20, 2003 set up a
number of working groups for development of IVOA registries.

Rwp02 - Requirements, Science Cases, Use Cases, Test Cases
has the charter to focus on science case scenarios, and use cases
related specifically to VO registries. In particular, to develop
use cases which will help define requirements for VO registries.
( webpage: http://www.ivoa.net/twiki/bin/view/IVOA/IVOARegWp02 )

This document represents the current status of Rwp02, including:

+ Work Plan
+ Scope
+ Working Conceptual Definition of a Registry for Science,
+ Broad Operational Requirements
+ Key Science Case Candidates
+ Requirements Imposed by Science Cases
+ Use Cases extracted from Science Cases

The intention is that this draft provides a starting point for
discussion at the Registry Working Group session at the Cambridge
Interoperability Meeting, May 12-16, 2003.
( Registry WG session is Wed, May 14, 0900-1300, 1400-1700)


Work Plan
---------

- Define Scope draft v0.1 11 April        - posted to IVOARegWp02
- Key Science Cases draft v0.1 11 April   - posted to IVOARegWp02
  ( includes a brief review of VO
    Science Cases in relation to
    registries )

- Use Cases draft v0.1 25 April           - not done
- Requirements draft v0.1 09  May         - this draft document

(Cambridge Meeting May12 -16)

- Requirements drafts v0.2 28 June
  Science Cases
  Use Cases
  Test cases


 Scope of Work Package
----------------------
1. Identify Key Science Cases to be used as drivers for defining
   registry requirements. These should be illustrative of the range
   of requests that may be sent to a regsistry.

2. Describe a set of Use Cases, which are representative of envisaged
   registry usage, and include the use cases required to execute the
   Key Science Cases.

3. Define a set of actual queries against which registry implementations
   may be tested.

4. Requirements. Make a set of requirements which are necessary to be
   able to execute the Use Cases, and will be useful in actual development
   of registries.



Working Definition(s) of Registries
-----------------------------------

A registry is a queriable service/resource that responds with a structured
description of other services/resources.

Registered services/resources are described by various types of metadata
as outlined in RSM v6.

Registries are a way of narrowing down the search for resources to a
manageable  subset. It is not intended that a registry replicates all
data into a central repositry, but rather a condensed set of metadata.

A registry is a dynamic database of metadata describing a set of
Internet-available resources.

    A registry is used to identify and locate resources satisfying
user-specified criteria, and to direct more detailed information requests to
the relevant services.



Broad Operational Requirements
------------------------------
(Adopted from NVO draft registries requirements - R. Plante)


A.  Registration Contents:
    1.  Descriptions of Resources (Resource metadata as described in RSM v6)

    2.  Descriptions of Services:
    +  how to invoke the service, including inputs and outputs
    +  other characteristics of the service; in particular, metadata
       about the kind of data returned by the service.
        +  compliance details when the service is meant to be an
       implementation of a standard service.

    3.  The metadata structures supported by the registry should be
        consistent with those used by IVOA at large. 

    4.  Need to support a hierarchical notion of resources in order to
        describe sites that manage multiple collections, missions,
        services, etc.


B.  Registry Queries
    1.  Resources and Services can be searched for based on characteristics.

    2.  Query results returned in machine-interpretable form

    3.  Can search for:
     +  resources
     +  services of particular types

    4.  It should be possible to uniquely retrieve a description of a
        resource or service either via a unique ID or via a small and
        predictable set of metadata. 

C.  Registration Process and Registry Evolution

    1.  It should be easy for data/service provider to register a new
        service.  It should not require one to resubmit information
        about the resource that was registered before for another
        service.

    2.  It should be easy or automatic to update the metadata associated
        with a resource or service. 

    3.  It should be easy to unregister a resource and service.     

    4.  The registry should expect that registered services may
        become temporarily unavailable. 

    5.  The registry should account for the possibility that a service
        will become permanently unavailable without it being explicitly
        unregistered.

    6.  The registry system shall support classes of services sharing
    common characteristics where these shared characteristics can
    be specified once and then referred to from the implementing
    services.  Updates to shared characteristics can also be made
    using a single update request to the registry.


This is based on the idea that registries are used to support coarse
searching for resources that might have what the user wants; a definitive
search would accomplished by querying the candidate resources directly.


Key Science Cases
-----------------
Key science cases to be used as drivers for defining registry
requirements. These are intended to be illustrative of the range
of requests that may be sent to a registry.

Following a review of the current science cases across the
various VO initiatives,
(http://www.ivoa.net/internal/IVOA/IVOARegWp02/KeySciCaseReview.txt)
a 1st draft set of science cases has been selected.

Selected Science Cases:

1. 
AstroGrid: Brown Dwarf Selection
NVO: Select Dwarf Galaxies by Colour for Observational Follow-up
 
Chosen as representative of parameter constrained catalog search
scenarios.

2.
AstroGrid: Deep Field Surveys

Chosen as representative of a data search scenario, with use of
coverage (spatial and temporal) constraints.

3.
NVO: Gamma Ray Burst +
     Chosen because NVO is planning registry specific developments
     for this science case to turn their GRB demo into a more
     general "show me the sky" tool

4.
NVO: Find Super Novae Pre-Burst Observation
     Chosen as representative of 'find all data at this point'
     type scenarios. (Perhaps this is the same as the GRB general tool)

5.
AstroVirtel: Luminosity functions of Star Clusters in Nearby Galaxies
             Chosen because of detailed requirements for registry
             functions.

See: http://www.ivoa.net/internal/IVOA/IVOARegWp02/astrovirtel_use_case.pdf


Requirements Imposed by Key Science Cases
-----------------------------------------

At present the requirements imposed by the science cases
is only in the form of a list of registry requests
drawn from the science cases. This is meant as a
representative list, not in any way complete.
 
It is envisaged that this should lead to a heirarchical list
of science metadata that needs to be in a registry. Most
importantly what is the minimal set.

Working list of example registry requests::

 Catalogs relevant to Galaxy Clusters
 Catalogs with coverage of I,K,R at given locations
 Catalogs of dwarf galaxies with color or magnitude measurements

 Identify resources relevant to Galactic Clusters
 Identify Deep Field Survey Resources

 Identify which parameters can be queried for a given resource

 Data Provider Services requests on
  - coverage - space, time, energy
  - resolution, field of view, pixel scale, limiting
  - calibration, data quality
 
  - requests for data of unique provenance (not multiple datasets
    or catalogs derived from the same observations)



...need help here to expand list and make into requirements...


Interpretive capabilities.
--------------------------
A number of the science case scenarios imply a kind of interpretive
capability for registries. Some of these are familiar, but others
are much more challenging, and it is not clear if they belong as
a registry requirement. ( Rather the requirement on the registry might
be that the metadata is listed in such a way as to allow construction
of interpretive capabilities as registered services )
 

The most familiar of these is Coordinate transformations and
object name resolving. These are often the starting points for
searches. Current archives/catalog browsers handle this fairly
well so it is assumed that reistry will be able to do the same.
(In the registry framework it is often assumed this will be
 handled by a coordinate/astronomical name resolver registered
 service)

Higher level interpretive capabilities assumed in some of the science
case scenarios include the ability to, for example, search by REDSHIFT,
not only returning results where redshift is explicit, but also results
where REDSHIFT may be recognised and calculated using explicit VELOCITY
values. This implies that astronomical concepts and their relationships
are somehow encoded within a registry.

Further, there has been a suggestion for  "Expert Knowledge Registries" 
into the registry so that a registered service "knows" :
"what is a galaxy", "what is a deVaucouleours profile", "what is an
elliptical galaxy", etc..

The issue of international language support has also been mentioned.


 - Having interpretive capabilities actually within a registry
   seems to implies the need for library of functions for the registry.
 - The complexity could easily get out of hand, so suggest a minimal
   set of functions to do Coordinates and Name Resolving.
   (As implemented in GLU for example)

   or ... only have interpretive capabilities as calls to registered
          services. 



Use Cases
---------

 + Use cases extracted from Key Science Cases

      - requirements for registries of different granularity
   ...

 + Categorized Use Cases
   (adapted from R. Plante use cases)
 

 1)  Locating Data Collections

    Find collections that may contain desired data.

    Return possibilities
      *  the type of resource (e.g. archive, survey, catalog )
      *  Collection's Home Page
      *  a description of supported (access) services

    Possible Search criteria
      *  the type of resource
      *  type of data included (images, spectra, catalog, ...)
      *  frequency waveband
      *  sky coverage
      *  time coverage
      *  the types of services supported (SIA, Cone search, etc.)
      *  descriptive keywords

2) Locating Services

   A. Data Access Services

      Example: Find all optical, ground-based image archives that
              support SIA.
           Find all mosaicing services that cover the north
              galatic pole.

      Return:
        *  service description (describing supported inputs, outputs,
         and access URL)

      Possible Search criteria:
        *  type of service
    *  type of data included (images, spectra, catalog, ...)
        *  frequency waveband
        *  sky coverage
        *  time coverage
        *  descriptive keywords
    *  access type (i.e. what level of authorization required;
         e.g. public vs. authenticated or proprietary)

   B. Generic/Processing Services

      Examples: Find a name-resolver
        Find a coordinate converter

      Return
        *  service description

      Possible Search criteria:
        *  type of service
    *  input/output objects
    *  descriptive keywords
    *  access type (i.e. what level of authorization;
         e.g. public vs. authenticated or proprietary)

3) Locating Resources

   Return
     * description of resource
     * contact information
     * URL to Resource's home page

   Possible Search criteria:
     * resource name or identifier
     * descriptive keywords



Registry Science Metadata
-------------------------
The proposals for resources metadata in RSM v6 and eleswhere
have been compared against some sceintific criteria.

See. Anita Richards:
http://www.ivoa.net/forum/registry/0200.htm






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Later today I will have a more comprehensible documentation for the
STC schemas; probably between 13 and 14 EDT.

Apologies for not managing to get them out before the European end of
the working day :(

  - Arnold

--------------------------------------------------------------------------
Arnold H. Rots                                Chandra X-ray Science Center
Smithsonian Astrophysical Observatory                tel:  +1 617 496 7701
60 Garden Street, MS 67                              fax:  +1 617 495 7356
Cambridge, MA 02138                             arots@head-cfa.harvard.edu
USA                                     http://hea-www.harvard.edu/~arots/
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Date: Fri, 9 May 2003 10:34:46 +0100 (BST)
From: Nicholas A Walton <naw@ast.cam.ac.uk>
To: Tony Linde <ael@star.le.ac.uk>
cc: registry@ivoa.net
Subject: RE: Schedule for interop week
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hi tony,

jus notiuced - coffee is only going to be avaiable from 11-11.30 so you'll 
have to move your break time - probably possible?

cheers, nic

On Thu, 8 May 2003, Tony Linde wrote:

> Is this still a valid agenda for our bits of the interop meeting next
> week? Bob mentioned that he wanted to give a presentation under Rwp03 -
> do we want to have these presentations earlier in the day or left to the
> post-lunch session?
> 
> Do we need to organise anything else for these sessions?
> 
> Cheers,
> Tony.
> 
> > -----Original Message-----
> > From: Tony Linde [mailto:ael@star.le.ac.uk] 
> > Sent: 28 April 2003 17:25
> > To: 'IVOA Registry mailing list'
> > Subject: Schedule for interop week
> > 
> > 
> > We need to pull together a schedule for the interoperability 
> > week. Pierre has indicated that he wants to give a 
> > presentation - does anyone else also want to do this?
> > 
> > We have all day Wednesday available, though I'll be out 
> > during the AVO Exec meeting in the afternoon.
> > 
> > On Thursday we have 2 hours to present the work package draft 
> > documents.
> > 
> > As a starter for discussion, how about the following:
> > 
> > Wednesday
> > =========
> > 09:30		Rwp02: draft specs presentation	Mark
> > 09:50		Rwp03: draft specs presentation	Ray
> > 10:10		Rwp04: draft specs presentation	Keith
> > 
> > 10:30 BREAK
> > 
> > 11:00		Rwp02: discussion				Mark
> > 11:30		Rwp03: discussion				Ray
> > 12:00		Rwp04: discussion				Keith
> > 
> > 12:30		Rwp01: presentation & discussion	Tony
> > 
> > 13:00	LUNCH
> > 
> > 14:00		Presentations from individuals
> > 		 - Pierre
> > 		 - ???
> > 
> > 15:00		Carry on RwpNN discussions		Bob
> > 		 to redraft specs
> > 
> > ??:??	BACK to hotels to rewrite presentations!!
> > 
> > Thursday
> > ========
> > 09:00		Rwp01: presentation & questions		Tony
> > 09:15		Rwp02: presentation & questions		Mark
> > 09:45		Rwp03: presentation & questions		Ray
> > 10:15		Rwp04:: presentation & questions		Keith
> > 10:45		General feedback & discsussion		Bob
> > 
> > 
> > *PLEASE NOTE: every WP must have distributed their draft 
> > specification to the mailing list and posted it onto their 
> > wiki page by 12:00 noon Friday 9th May. People should come to 
> > the meeting with specific questions, having read the papers.
> > 
> > How does this sound?
> > 
> > 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
> > 
> __
> 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
> 

-- 
========================================================================
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 - Fri May  9 16:06:59 2003
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Subject: Lastest design docs
From: Keith Noddle <ktn@star.le.ac.uk>
To: IVOA Registry mailing list <registry@ivoa.net>
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Attached please find the design docs I promised to create for further
discussion. These are a series of pictures (GIFs) and XSD schema based
upon the discussions in the mailing list. These have been uploaded to
the Wiki (with apologies and thanks to Marco) in some sort of order.
Start from:

http://www.ivoa.net/twiki/bin/view/IVOA/RWP04DesignDocs

RWP04 has 2 sessions on Wednesday next week and 1 on Thursday. If anyone
wishes to deliver presentations during those session, please can you let
Tony and me know.

Thanks,

Keith.

-- 

Keith Noddle			Phone:  +44 (0)116 223 1894
AstroGrid Technical Lead	Fax:    +44 (0)116 252 3311
Dept of Physics & Astronomy	Mobile: +44 (0)7721 926 461
University of Leicester		Email:  ktn@star.le.ac.uk
Leicester, UK   LE1 7RH		Web:    http://www.astrogrid.org

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--=-StoRXq7xz99SeHMQBObb--

From - Fri May  9 16:21:59 2003
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Date: Fri, 9 May 2003 09:17:01 -0500 (CDT)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: registry@ivoa.net
Subject: RWP03: XML Resource Metadata (fwd)
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Hi,

Just a reminder about this message sent 2 weeks ago.  A draft 
specification for registry metadata can be found via the URLs below.  If 
your not one to stare at XSD files, I would recommend the overview 
document that includes diagrams of the schema.  

cheers,
Ray

---------- Forwarded message ----------
Date: Tue, 22 Apr 2003 14:16:01 -0500 (CDT)
From: Ray Plante <rplante@ncsa.uiuc.edu>
To: registry@ivoa.net
Subject: RWP03: XML Resource Metadata 

WP3ers,

In response to one of our early action items, I have posted to the WP03
page (http://www.ivoa.net/twiki/bin/view/IVOA/IVOARegWp03) under the
Specifications section a version 0.1 XML Schema for Resource Metadata.  
To help folks interpret the schema documents, I prepared an overview
document
(http://www.ivoa.net/internal/IVOA/IVOARegWp03/MDinXML-Summary.html) that
includes some helpful XMLSpy diagrams.  I would appreciate any and all
comments.

Note that this specification need not be the only one we have on the block 
for discussion.  If there are other schemas you would like us to discuss, 
please post them as well.

cheers,
Ray


From - Sat May 10 16:25:32 2003
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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: "'IVOA Registry mailing list'" <registry@ivoa.net>
Subject: schedule
Date: Fri, 9 May 2003 17:40:52 +0100
Organization: University of Leicester
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Status:   

I've posted the schedule (slightly rearranged) to:
  http://www.ivoa.net/twiki/bin/view/IVOA/InterOpMay2003ResReg

Let me know if this is not as you wanted. If you're planning a presentation,
please edit the page and add it to the schedule.

See you next week :)

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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From: "Robert Hanisch" <hanisch@stsci.edu>
To: <registry@ivoa.net>
Subject: RMS V7
Date: Fri, 9 May 2003 13:23:52 -0400
Organization: Space Telescope Science Institute
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This is a multi-part message in MIME format.

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The latest revision of the Resource and Service Metadata document has =
just been uploaded to the TWiki:

http://www.ivoa.net/internal/IVOA/IvoaResReg/ResourceServiceMetadataV7.do=
c

or

http://www.ivoa.net/internal/IVOA/IvoaResReg/ResourceServiceMetadataV7.pd=
f

I hope you will all have a chance to review it, even though it is coming =
in so close to our meeting next week.

See you in Cambridge,
Bob
------=_NextPart_000_0033_01C3162E.3BCFD9D0
Content-Type: text/html;
	charset="iso-8859-1"
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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 6.00.2800.1141" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>The latest revision of the Resource and =
Service=20
Metadata document has just been uploaded to the TWiki:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2><A=20
href=3D"http://www.ivoa.net/internal/IVOA/IvoaResReg/ResourceServiceMetad=
ataV7.doc">http://www.ivoa.net/internal/IVOA/IvoaResReg/ResourceServiceMe=
tadataV7.doc</A></FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>or</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2><A=20
href=3D"http://www.ivoa.net/internal/IVOA/IvoaResReg/ResourceServiceMetad=
ataV7.pdf">http://www.ivoa.net/internal/IVOA/IvoaResReg/ResourceServiceMe=
tadataV7.pdf</A></FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>I hope you will all have a chance to =
review it,=20
even though it is coming in so close to our meeting next =
week.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>See you in Cambridge,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Bob</FONT></DIV></BODY></HTML>

------=_NextPart_000_0033_01C3162E.3BCFD9D0--

From - Sat May 10 16:25:32 2003
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From: Arnold Rots <arots@head-cfa.cfa.harvard.edu>
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Message-Id: <200305091808.h49I8el0010735@xebec.cfa.harvard.edu>
Subject: Space-Time Coordinate metadata documentation
To: registry@ivoa.net, interop@ivoa.net, metadata@us-vo.org
Date: Fri, 9 May 2003 14:08:40 -0400 (EDT)
CC: cfa_nvo@head-cfa.cfa.harvard.edu
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Status:   

I have put a document describing the Space-Time Metadata schemas on my
web page.  It is a PDF document in the form of annotated XMLSpy
diagrams.  I created it in Powerpoint and this particular PDF file
shows the slides in full-scale.  That is unfortunate since it makes 34
pages, but any smaller format made the fineprint illegible.

http://hea-www.harvard.edu/~arots/nvometa/STCdoc.pdf

The schemas are at:

http://hea-www.harvard.edu/~arots/nvometa/stc.xsd
http://hea-www.harvard.edu/~arots/nvometa/coords.xsd
http://hea-www.harvard.edu/~arots/nvometa/region.xsd

Enjoy and see you next week,

  - Arnold

--------------------------------------------------------------------------
Arnold H. Rots                                Chandra X-ray Science Center
Smithsonian Astrophysical Observatory                tel:  +1 617 496 7701
60 Garden Street, MS 67                              fax:  +1 617 495 7356
Cambridge, MA 02138                             arots@head-cfa.harvard.edu
USA                                     http://hea-www.harvard.edu/~arots/
--------------------------------------------------------------------------

From - Mon May 19 17:45:18 2003
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Message-ID: <3EC8FB5A.2080100@eso.org>
Date: Mon, 19 May 2003 17:42:18 +0200
From: "Marco C. Leoni" <mleoni@eso.org>
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To: IVOA registry WG <registry@ivoa.net>
Subject: Rwp04: Types of Registry
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Hello RegPeople,

    thinking about the three different types of registry defined in the 
Registry workshop I've got a question:
does that structure allow a registry that contains only references to 
other registries (or a mix of references and full info)?


Cheers,
    Marco

From - Mon May 19 19:10:18 2003
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Date: Mon, 19 May 2003 12:07:55 -0500 (CDT)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: "Marco C. Leoni" <mleoni@eso.org>
cc: IVOA registry WG <registry@ivoa.net>
Subject: Re: Rwp04: Types of Registry
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On Mon, 19 May 2003, Marco C. Leoni wrote:
> does that structure allow a registry that contains only references to 
> other registries (or a mix of references and full info)?

The short answer is yes.  By reference, we would mean a description of 
known registries that would include information (e.g. base URLs) on 
where/how to access it.  

This would probably be a registry of the type "local".  That is, it does 
not contain full listing of resources, but it could support queries.

cheers,
Ray


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From: "Roy Williams" <roy@cacr.caltech.edu>
To: <mleoni@eso.org>, "Patricio F. Ortiz" <pfo@star.le.ac.uk>
Cc: <ucd@ivoa.net>, <registry@ivoa.net>
References: <Pine.GSO.4.44L0.0305191553150.21500-100000@sparky.star.le.ac.uk> <3EC901E8.40307@eso.org>
Subject: Re: MyUCDs & Registry
Date: Mon, 19 May 2003 10:16:10 -0700
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Patrick and Marco

> are you sure the Registry will include all these information?
> Perhaps "column names" and "units" will be resolved by
> the service provider, and not by the registry itself.

My understanding is that every registry entry is based on the Resource and
Service Metadata (RSM) document (*). Everything in the registry has the
basic stuff like title and publisher and description, also spectral and sky
coverage.

Then there are extension pieces, and so far we only have a good idea of
extending to services. The metadata for these includes the URL, the mime
type of what comes back, and other stuff that defines standard VO services
(eg SIA, Cone etc).

Whta is missing from the RSM is an extension that deal specifically with
tables. It would include much of the VOTable header information I assume,
including the UCDs.

I think that now would be a good time to sketch an XML schema for catalog
metadata. We already have curation and coverage from the Resource base, but
then how is the extension document different from a VOTable header?

Roy


(*)
http://www.ivoa.net/internal/IVOA/IvoaResReg/ResourceServiceMetadataV7.doc

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


> Any registry will contain metadata about the services listed, ie,
> the catalogues.
> The registry would know (among other things),
> - catalogueName (possibly catalogueUniqueID)
> - catalogueTitle
> - catalogueKeywords
> - catalogueAuthor
> - number of columns
> - number of records
> - column names, UCDs, units
> - name ID,MAIN ---
> - RA POS_EQ_RA,MAIN h:m:s
> - Dec POS_EQ_DEC,MAIN d:m:s
> ....
> - Vmag PHOT_JHN_V mag
> - Bmag PHOT_JHN_B mag
> - z REDSHIFT ---
>

are you sure the Registry will include all these information?
Perhaps "column names" and "units" will be resolved by the service
provider, and not by the registry itself.

Cheers,
    Marco



From - Mon May 19 19:25:17 2003
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Date: Mon, 19 May 2003 12:24:28 -0500 (CDT)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: ucd@ivoa.net
cc: registry@ivoa.net
Subject: Re: MyUCDs & Registry
In-Reply-To: <3EC901E8.40307@eso.org>
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Hi Guys,

The current registry model allows for catalogs to be registered 
individually and that the descriptions stored in the registry could 
contain all the information that Patricio listed.  The main question is 
how fine-grained you want the registry to be and, thus, whether catalogs 
are within your limit.  

I think we heard at the interop meeting last week sufficient interest in
registering catalogs.  So then the next step would be to model the catalog
description, using the generic Resource metadata as a starting point.  We
would ask ourselves what additional information do we want in the
description.  Column UCDs and names would be an example of that type of
information.

I'll note that in our prototype schema for describing SIA services, we 
included a description of the columns returned by an image query.  This 
was done using the VOTable FIELD elements; thus, it included both the 
local names and the UCDs (along with the IDs, type, and anything else you 
can stick in a FIELD element and its children).  This could be done for a 
catalog description as well (regardless of whether it is actually 
available in VOTable format).  

hope this helps,
Ray



On Mon, 19 May 2003, Marco C. Leoni wrote:
> 
> 
> Patricio F. Ortiz wrote:
> 
> >On Mon, 19 May 2003, Marco C. Leoni wrote:
> >  
> >
> >>Hi Patricio,
> >>    one question about the point below:
> >>
> >>    
> >>
> >>>	Let me include here another element before the submission of a
> >>>	query to the resource handling catalogues: The registry.
> >>>
> >>>	Any registry will contain metadata about the services listed, ie,
> >>>	the catalogues.
> >>>	The registry would know (among other things),
> >>>		- catalogueName (possibly catalogueUniqueID)
> >>>		- catalogueTitle
> >>>		- catalogueKeywords
> >>>		- catalogueAuthor
> >>>		- number of columns
> >>>		- number of records
> >>>		- column names, UCDs, units
> >>>			- name	ID,MAIN	---
> >>>			- RA	POS_EQ_RA,MAIN	h:m:s
> >>>			- Dec	POS_EQ_DEC,MAIN d:m:s
> >>>			....
> >>>			- Vmag	PHOT_JHN_V	mag
> >>>			- Bmag	PHOT_JHN_B	mag
> >>>			- z	REDSHIFT	---
> >>>
> >>>      
> >>>
> >>are you sure the Registry will include all these information?
> >>Perhaps "column names" and "units" will be resolved by the service
> >>provider, and not by the registry itself.
> >>
> >>Cheers,
> >>    Marco
> >>    
> >>
> >
> >Hi Marco,
> >
> >well, I would have thought so. It's done already by vizier meta-information
> >tables (which could be considered a local registry) and surely by other
> >services. It's a good point though, how much is a registry supposed to
> >know? In the scheme that Keith Noddle presented in Cambridge, I would
> >expect at least the local register (read service provider's) should know
> >about about this. Whether the higher level registers decide to collect this
> >information is to be seen, but if you ask *me*, I would say yes, they
> >should keep this information. We are not talking about a huge data volume
> >here; the advantages are large though, as you don't have to go everywhere
> >with your query.
> >
> >I just had to deal with getting a mortgage and run from bank to bank
> >filling up applications not knowing if I satisfied all the conditions they
> >asked; then a consultant phoned us and we dealt with him, he found out
> >who would lend us the money and it worked fine. The analogy seems quite
> >appropriate for our situation in VO. An astronomer wants to formulate a
> >general query, he or she has no idea where this could be done, so s/he
> >asks a service to lauch the query urbe et orbi... Surely the data will
> >come back to the astronomer, but if we apply a filtering system which
> >can select the services which may give a positive answer (and weed off
> >the ones with a negative), then the number of transactions diminishes
> >and the response time is shorter.
> >
> >An intermediate solution would be to send the query to broker-services urbe
> >et orbi, and let those services do the filtering and send the query to
> >places which may give a positive answer.
> >
> >IMHO not using this meta-information would be a real waste.
> >
> >Cheers,
> >
> >Patricio
> >
> >---
> >Patricio F. Ortiz			pfo@star.le.ac.uk
> >AstroGrid project
> >Department of Physics and Astronomy
> >University of Leicester			Tel: +44 (0)116 252 2015
> >LE1 7RH, UK
> >
> 
> Patricio,
> 
>     I agree that a filtering system would be nice, and in fact a 
> registry is supposed to do that (in my opinion): if necessary it will 
> send an "urbi et orbi" query and give back to the astronomer only the 
> relevant results, where this means compare them with the original 
> requirements (e.g. exclude all the "no info about it" answers). The same 
> before sending the query, if the registry has enough information about 
> services (this is not the case if we think of registries containing only 
> references to other registries, but this will simply add one more level 
> to the structure).
> 
> What I meant before is that probably we need only UCDs in the registry 
> without any unique column names: when the query reaches the service then 
> it will be translated and UCDs mapped to comlumn names.
> - On the other side, if the user already knows the unique column name 
> then using it will remove any control about UCDs.
> - Last possibility, giving both unique column name and UCD will create a 
> well-defined detailed query, with specific result even in the "urbi et 
> orbi" case.
> 
> 
> Cheers,
>     Marco
> 

From - Mon May 19 20:45:18 2003
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Date: Mon, 19 May 2003 13:42:58 -0500 (CDT)
From: Ray Plante <rplante@poplar.ncsa.uiuc.edu>
Reply-To: Ray Plante <rplante@ncsa.uiuc.edu>
To: Gretchen Greene <greene@stsci.edu>
cc: ucd@ivoa.net, <registry@ivoa.net>
Subject: RE: MyUCDs & Registry
In-Reply-To: <000a01c31e2e$25517490$2bfaa782@stsci.edu>
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Hi Gretchen,

On Mon, 19 May 2003, Gretchen Greene wrote:
> If the registry is going to supply 'Subject' , i.e. keywords for
> targeting specific astronomical topics, then I think it would equally
> serve to provide the UCDs and their associated tags (units, type, etc.)
> for refining queries.  
> 
> Not to sound harsh,  my only question is why do we have to consider
> generating more schema files to do this?  UCD's are fundamental
> descriptors in my mind and could be included in the base terms as
> optional elements.  I guess the discretion comes from service providers
> with column descriptions not mapped into UCD's?

There is precedence for integrating it into the generic resource metadata:  
the current VOResource contains Coverage.  However, it was pointed out
last week that it is unclear, for example, what Coverage means when it
applies to an organization.  It was suggested (and I plan to look at this)
that Coverage only be associated with descriptions of Data Collections and
Services.

I mention this because it illustrates a basic modeling issue.  When UCDs
are associated with a description of an SIA service, it can be made clear
what the role the UCDs play in the service (i.e. these are the UCDs
associated with the columns returned from an image query).  Similarly, the
connection is clear when made part of a Catalog description.  However, if
they are associated with a generic resource, their role is ambiguous.  
That is, what does it mean to search for Organizations based on UCDs?

> my only question is why do we have to consider
> generating more schema files to do this?  

Your question suggests that dealing with multiple schema files has 
additional overhead costs associated with it (as opposed to just have one 
schema).  Do you see this as a problem?

We put the metadata that is not purely generic Resource metadata into a
separate schema because it makes for a friendlier extension mechanism.  
If we add new metadata that, say, specifically describes Catalogs into the
VOResource schema, it affects all users of this schema regardless of
whether they care about Catalogs.  (They may have to change their software
to cope with the new version.)  However, if we put the metadata into its
own schema that extends VOResource, it only affects those that want to
describe Catalogs.

cheers,
Ray


From - Mon May 19 21:25:18 2003
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From: "Gretchen Greene" <greene@stsci.edu>
To: "'Ray Plante'" <rplante@ncsa.uiuc.edu>
Cc: <ucd@ivoa.net>, <registry@ivoa.net>
Subject: RE: MyUCDs & Registry
Date: Mon, 19 May 2003 15:21:40 -0400
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Thanks for the insights Ray,  I realize I missed out on some discussions
that occurred at the IVOA.  Still,  in building this first registry with
the existing schemas,  I am finding that there are subtleties to the
implementation and my concern is in chasing down multiple schema
versions and metadata definitions prohibits efficient prototyping.  For
example,  the existing repositories (OAI, previous Cone registry, etc.)
all have varying elements and content.  Now which schema files to I
pursue to bring about uniformity?  This is only the very beginning.  

The other point is that there are not huge numbers of entries/resources
yet in these registries (remember I'm used to the GSC2 billions) and so
it seems a little odd to create a highly designed configuration before
ever implementing one even though the design ideas are good ones.  

So...I cheer on the designing but encourage people to start working with
the standard schemas/files and see how they interface before going too
far.

-Gretchen




-----Original Message-----
From: Ray Plante [mailto:rplante@poplar.ncsa.uiuc.edu] 
Sent: Monday, May 19, 2003 2:43 PM
To: Gretchen Greene
Cc: ucd@ivoa.net; registry@ivoa.net
Subject: RE: MyUCDs & Registry

Hi Gretchen,

On Mon, 19 May 2003, Gretchen Greene wrote:
> If the registry is going to supply 'Subject' , i.e. keywords for
> targeting specific astronomical topics, then I think it would equally
> serve to provide the UCDs and their associated tags (units, type,
etc.)
> for refining queries.  
> 
> Not to sound harsh,  my only question is why do we have to consider
> generating more schema files to do this?  UCD's are fundamental
> descriptors in my mind and could be included in the base terms as
> optional elements.  I guess the discretion comes from service
providers
> with column descriptions not mapped into UCD's?

There is precedence for integrating it into the generic resource
metadata:  
the current VOResource contains Coverage.  However, it was pointed out
last week that it is unclear, for example, what Coverage means when it
applies to an organization.  It was suggested (and I plan to look at
this)
that Coverage only be associated with descriptions of Data Collections
and
Services.

I mention this because it illustrates a basic modeling issue.  When UCDs
are associated with a description of an SIA service, it can be made
clear
what the role the UCDs play in the service (i.e. these are the UCDs
associated with the columns returned from an image query).  Similarly,
the
connection is clear when made part of a Catalog description.  However,
if
they are associated with a generic resource, their role is ambiguous.  
That is, what does it mean to search for Organizations based on UCDs?

> my only question is why do we have to consider
> generating more schema files to do this?  

Your question suggests that dealing with multiple schema files has 
additional overhead costs associated with it (as opposed to just have
one 
schema).  Do you see this as a problem?

We put the metadata that is not purely generic Resource metadata into a
separate schema because it makes for a friendlier extension mechanism.  
If we add new metadata that, say, specifically describes Catalogs into
the
VOResource schema, it affects all users of this schema regardless of
whether they care about Catalogs.  (They may have to change their
software
to cope with the new version.)  However, if we put the metadata into its
own schema that extends VOResource, it only affects those that want to
describe Catalogs.

cheers,
Ray



From - Mon May 19 21:45:17 2003
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Subject: Re: MyUCDs & Registry
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Gretchen Greene wrote:

> The other point is that there are not huge numbers of entries/resources
> yet in these registries (remember I'm used to the GSC2 billions) and so
> it seems a little odd to create a highly designed configuration before
> ever implementing one even though the design ideas are good ones.

At the Center for Astrophysics, we tried gathering descriptions of as
many types of archived data as we could find hanging around here and
tried to get knowledgeable people to describe them in a uniform way
which we developed in parallel to the larger VO effort.  We thought
that working from the archives up could be complementary to the
grand design work that many others were doing.  We do not have a
VO standard interface to the information we collected, but I think
that the data could be translated into the protocols which are being
discussed.  We would be interested in what other people who have
data they want to publish to the VO think about the parameters we
have been able to collect.

Check it out at http://tdc-www.harvard.edu/vo

-Doug Mink

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Reply-To: <ael@star.le.ac.uk>
From: "Tony Linde" <ael@star.le.ac.uk>
To: <registry@ivoa.net>
Subject: RE: MyUCDs & Registry
Date: Mon, 19 May 2003 22:51:17 +0100
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Wow! This topic seems to have mushroomed. A few points:

1. The IVOA will define interfaces to the Registry and the minimum standard
that any registry should conform to. It will be up to each registry how it
implements those standards and whether they offer extension services. 

So, to the first point, the standard may say that a registry must return the
columns defined in a dataset but one implementation might store that
information for every dataset and another might query a dataset when it
needs to answer such a query. On the second point, a registry might offer to
run queries and consolidate results on behalf of clients - that does not
mean that all registries have to offer such services.

2. There is likely to be very little information which is mandated across
all resources listed in a registry. Simple curation metadata (owner email,
phone number etc) is probably all that every resource will have in common. 

We can then imagine an inheritance hierarchy of metadata sets branching out
from that. One branch will be resources offering to provide data from a
query (such metadata will include data type, coverage etc); one branch from
that might be for images and another for catalog data etc. Another top-level
branch might be for services; from that a branch for visualisation tools
etc. Each branch will have metadata associated with it; and lower levels
will have more specific data associated with them.

This is similar to the OAI 'metadata format'. A resource, when added to the
registry, will state that it is of type 'X' and that it will agree to
provide metadata in formats A, B, C (ie it will provide metadata under those
branches). Having signed up to provide such metadata, a registry query
against that resource can then identify one, some or all of the metadata
formats required as an answer to the query.

3. For data-oriented resources, the metadata should include UCDs and column
names. The UCD will go some way towards identifying the type of data in a
column. It will be possible to query the registry for all 'data-oriented
resources' (eg all resources which have agreed to satisfy the 'dataset'
metadata format) for which there is one or more columns described by
POS_EQ_RA or equivalent.


In summary, the RSM must expand to cover all the above if we intend it to be
the final standard for describing the metadata in the Registry.

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 - Tue May 20 11:20:18 2003
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From: "Tony Linde" <ael@star.le.ac.uk>
To: <registry@ivoa.net>
Subject: RE: MyUCDs & Registry
Date: Tue, 20 May 2003 10:16:08 +0100
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Status:   

I've read the posts from yesterday in more detail and have a couple more
points:

4. It has been suggested a couple of times that the Registry should be able
to take in complete data-oriented queries and should analyse these to
determine a) which resources can answer the query and b) how to formulate
the query for each resource. 

On b) I don't think the registry should ever do this - it should be left to
the resource to translate a standard format (VOQL, AQL) query into its own
format.

Point a) is more problematic. It would be nice if the Registry could do this
but I would prefer to keep the registry simply answering questions about
resource metadata and leave it to the workflow engine to construct the
standard query from the user's statement of needs. At this stage of VO
development, it might pay to keep such components separate to speed
evolution and possibly bring them together later. 

5. Should the Registry store the column names and units used in a catalog or
data table? I would say 'definitely' for the column names and 'probably' for
the units. The column names are essential to resolve duplicate UCDs before a
generic query is farmed out. Units may not be needed. Would a user need to
know the units a column's data is stored in? Not if the query uses UCDs and
standard units for those UCDs - it is then up to the resource to resolve the
standard query into a sql query by unit conversion. Any other reasons for
storing units?

*NOTE: when I talk about the registry 'storing' metadata, I simply mean that
the registry must answer questions about that metadata and be able to return
it; whether an implementation of a registry stores it or retrieves it from
the resource when needed is strictly an implementation issue.

6. Gretchen mentions wanting to get started building a registry. This is
exactly what we are doing in AstroGrid. No-one should wait for the final
V1.0 registry specification. Let's work with what we've got and feed the
results back into the deliberations. As long as everyone expects to do at
least 300% refactoring :)

Cheers,
Tony. 

> -----Original Message-----
> From: Tony Linde [mailto:ael@star.le.ac.uk] 
> Sent: 19 May 2003 22:51
> To: registry@ivoa.net
> Subject: RE: MyUCDs & Registry
> 
> 
> Wow! This topic seems to have mushroomed. A few points:
> 
> 1. The IVOA will define interfaces to the Registry and the 
> minimum standard that any registry should conform to. It will 
> be up to each registry how it implements those standards and 
> whether they offer extension services. 
> 
> So, to the first point, the standard may say that a registry 
> must return the columns defined in a dataset but one 
> implementation might store that information for every dataset 
> and another might query a dataset when it needs to answer 
> such a query. On the second point, a registry might offer to 
> run queries and consolidate results on behalf of clients - 
> that does not mean that all registries have to offer such services.
> 
> 2. There is likely to be very little information which is 
> mandated across all resources listed in a registry. Simple 
> curation metadata (owner email, phone number etc) is probably 
> all that every resource will have in common. 
> 
> We can then imagine an inheritance hierarchy of metadata sets 
> branching out from that. One branch will be resources 
> offering to provide data from a query (such metadata will 
> include data type, coverage etc); one branch from that might 
> be for images and another for catalog data etc. Another 
> top-level branch might be for services; from that a branch 
> for visualisation tools etc. Each branch will have metadata 
> associated with it; and lower levels will have more specific 
> data associated with them.
> 
> This is similar to the OAI 'metadata format'. A resource, 
> when added to the registry, will state that it is of type 'X' 
> and that it will agree to provide metadata in formats A, B, C 
> (ie it will provide metadata under those branches). Having 
> signed up to provide such metadata, a registry query against 
> that resource can then identify one, some or all of the 
> metadata formats required as an answer to the query.
> 
> 3. For data-oriented resources, the metadata should include 
> UCDs and column names. The UCD will go some way towards 
> identifying the type of data in a column. It will be possible 
> to query the registry for all 'data-oriented resources' (eg 
> all resources which have agreed to satisfy the 'dataset' 
> metadata format) for which there is one or more columns 
> described by POS_EQ_RA or equivalent.
> 
> 
> In summary, the RSM must expand to cover all the above if we 
> intend it to be the final standard for describing the 
> metadata in the Registry.
> 
> 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 - Tue May 20 16:25:19 2003
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Date: Tue, 20 May 2003 10:21:30 -0400
From: Tom McGlynn <Thomas.A.McGlynn@nasa.gov>
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> 5. Should the Registry store the column names and units used in a catalog or
> data table? I would say 'definitely' for the column names and 'probably' for
> the units. The column names are essential to resolve duplicate UCDs before a
> generic query is farmed out. 

Hi Tony,

I find this unconvincing.  How is a 'generic' query to be able
to do anything with column names?

Generic queries must use some standardized mechanism
to identify the elements used in the query (else they aren't
generic).  We have no standardized
mechanism for specifying the names of columns (and as far as I know
we have not even begun an effort to define such) so manifestly it is
currently impossible to use column names for a generic query.

However, I believe that the currently planned implementation of
UCDs will in practice be adequate virtually all of the time.

The putative problem with UCD's is that multiple columns
in a given table may share the same UCD.  Let's look at some
scenarios in more detail.  One example given in Cambridge
was an object catalog whose entries contained not only the object postition
but the center of the image on which the object was detected.
This is precisely the kind of case the 'main' UCD qualifier would (and does)
address.  It is easily be handled using either the current or proposed
UCD frameworks.  A user querying this table is getting objects, and the position
of the object should be the 'main' position.  This doesn't mean that
someone couldn't make a query against the observation centers, but
that would be a 'manual' query.

There are cases where the 'main' column is not obvious.  E.g., we might
have a table which is the cross-correlation between the SDSS and USNO-B object
catalogs.  This contains two positions neither really subordinate to the other.
Which should be used in querying the table?

I'll grant the UCD's do not magically solve this problem, but the column names
don't really help.  How does any kind of automated program
pick between 'ra_usno' and 'ra_sdss'?

In practice in this case I would expect the creators of this table to
pick one of the sets of position -- perhaps the one with the smallest
error -- and suggest that this is the primary set of positions.  How might
they do this most easily?  The 'main' qualifier in the UCD descriptions
is again the obvious candidate.  The choice here is a bit arbitrary, but so
would any automated choice based on position be.  Regardless it will
not matter very much, since the positions will be very close to one another.

For a third scenario let's consider a catalog of gamma-ray bursts where
the position of each burst is given as a quadralateral in the sky with
four bounding positions.  Here it's clearly impossible to pick any
one of these positions over the other.   The best resolution of this
problem is probably to define a UCD for the group of columns the define
the bounding box.  Again having column names doesn't help automated software
pick a column -- this table just isn't easily searchable using simple
cone-search techniques.  Fortunately this is a relatively rare sort of table.



To my mind UCD's provide precisely the information that is useful
in making automated decisions about which column to query.
They identify the kind of information that is in the column in a standard
way.  When there are multiple columns that have the same kind of information
I don't think it's reasonable to expect automated choices to be made
unless there is a hint from the creator of the table.

This doesn't mean that we don't want to have column names in the registry.
They may be helpful for directed (rather than automated queries), for
textual matches, and to help the user understand what is in a table
before actually running a query.


I agree with you about units.  Basically they are an implementation detail
and the registry should not be exposing this implementation choice.

		Tom McGlynn

From - Tue May 20 16:50:19 2003
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To: registry@ivoa.net
From: Masatoshi OHISHI <masatoshi.ohishi@nao.ac.jp>
Subject: RE: MyUCDs & Registry
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Dear Tony,

At 10:16 03/05/20 +0100, Tony Linde wrote:

>4. It has been suggested a couple of times that the Registry should be able
>to take in complete data-oriented queries and should analyse these to
>determine a) which resources can answer the query and b) how to formulate
>the query for each resource.
>
>On b) I don't think the registry should ever do this - it should be left to
>the resource to translate a standard format (VOQL, AQL) query into its own
>format.

I agree with you.

We, the VOQL group, have agreed that the registry provides such information
to the VOQL parser when resolving resource names (and locations)
to pass atomic queries.

Cheers,

    Masatoshi Ohishi


**********************************************
                 Masatoshi  OHISHI
National Astronomical Observatory of Japan
2-21-1, Osawa, Mitaka, Tokyo, 181-8588 JAPAN
phone :+81-422-34-3575  (office)
        +81-90-3574-9474 (mobile)
fax   :+81-422-34-3840
e-mail:masatoshi.ohishi@nao.ac.jp
********************************************** 


From - Tue May 20 17:30:18 2003
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From: "Tony Linde" <ael@star.le.ac.uk>
To: <registry@ivoa.net>, "'voql'" <voql@ivoa.net>
Subject: RE: MyUCDs & Registry
Date: Tue, 20 May 2003 16:22:28 +0100
Organization: University of Leicester
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Hi Tom,

> I find this unconvincing.  How is a 'generic' query to be 
> able to do anything with column names?

The column names have to be inserted into the query before it is sent out.
It may start out as generic but, in order to be resolved at the dataset end,
it must have some specificity added.

> We have no standardized mechanism for specifying 
> the names of columns (and as far as I know we have not even 
> begun an effort to define such) so manifestly it is currently 
> impossible to use column names for a generic query.

That's why we have these working groups :)

I've proposed a possible approach to inclusion of names in my original
discourse:
  http://www.ivoa.net/twiki/bin/view/IVOA/TonyOnUCDs
where the <useColumn columnName="DEJ2000" inResource="cat2" /> tag modifies
the generic <field ucd="POS_EQ_DEC"> tag of which it is a part.

> This doesn't mean 
> that someone couldn't make a query against the observation 
> centers, but that would be a 'manual' query.

But they are both queries and the query mechanism needs to cater for both
possibilities.

> How does any kind of 
> automated program pick between 'ra_usno' and 'ra_sdss'?

It certainly cannot and I wasn't proposing that it could. In this case the
workflow should either stop and flag the user that he needs to intervene in
the workflow and resolve the duplication or just picks one and goes ahead
(this option should be set by the user at the beginning of the workflow). 

But where the query is specified at the outset of constructing the workflow,
the workflow engine can consult the registry to determine if any duplication
conflicts occur and ask the user to resolve them before the job is
submitted.

> To my mind UCD's provide precisely the information that is 
> useful in making automated decisions about which column to 
> query. They identify the kind of information that is in the 

I agree completely but we need to provide mechanisms for those situations
where UCDs do not solve the problem.

Cheers,
Tony. 

PS: Sorry about the cross-post. This seems to be more of a VOQL question
now, so shall we continue the discussion on that list ??

> -----Original Message-----
> From: Tom McGlynn [mailto:Thomas.A.McGlynn@nasa.gov] 
> Sent: 20 May 2003 15:22
> To: registry@ivoa.net
> Subject: Re: MyUCDs & Registry
> 
> 
> > 5. Should the Registry store the column names and units used in a 
> > catalog or data table? I would say 'definitely' for the 
> column names 
> > and 'probably' for the units. The column names are essential to 
> > resolve duplicate UCDs before a generic query is farmed out.
> 
> Hi Tony,
> 
> I find this unconvincing.  How is a 'generic' query to be 
> able to do anything with column names?
> 
> Generic queries must use some standardized mechanism
> to identify the elements used in the query (else they aren't 
> generic).  We have no standardized mechanism for specifying 
> the names of columns (and as far as I know we have not even 
> begun an effort to define such) so manifestly it is currently 
> impossible to use column names for a generic query.
> 
> However, I believe that the currently planned implementation 
> of UCDs will in practice be adequate virtually all of the time.
> 
> The putative problem with UCD's is that multiple columns
> in a given table may share the same UCD.  Let's look at some 
> scenarios in more detail.  One example given in Cambridge was 
> an object catalog whose entries contained not only the object 
> postition but the center of the image on which the object was 
> detected. This is precisely the kind of case the 'main' UCD 
> qualifier would (and does) address.  It is easily be handled 
> using either the current or proposed UCD frameworks.  A user 
> querying this table is getting objects, and the position of 
> the object should be the 'main' position.  This doesn't mean 
> that someone couldn't make a query against the observation 
> centers, but that would be a 'manual' query.
> 
> There are cases where the 'main' column is not obvious.  
> E.g., we might have a table which is the cross-correlation 
> between the SDSS and USNO-B object catalogs.  This contains 
> two positions neither really subordinate to the other. Which 
> should be used in querying the table?
> 
> I'll grant the UCD's do not magically solve this problem, but 
> the column names don't really help.  How does any kind of 
> automated program pick between 'ra_usno' and 'ra_sdss'?
> 
> In practice in this case I would expect the creators of this 
> table to pick one of the sets of position -- perhaps the one 
> with the smallest error -- and suggest that this is the 
> primary set of positions.  How might they do this most 
> easily?  The 'main' qualifier in the UCD descriptions is 
> again the obvious candidate.  The choice here is a bit 
> arbitrary, but so would any automated choice based on 
> position be.  Regardless it will not matter very much, since 
> the positions will be very close to one another.
> 
> For a third scenario let's consider a catalog of gamma-ray 
> bursts where the position of each burst is given as a 
> quadralateral in the sky with four bounding positions.  Here 
> it's clearly impossible to pick any
> one of these positions over the other.   The best resolution of this
> problem is probably to define a UCD for the group of columns 
> the define the bounding box.  Again having column names 
> doesn't help automated software pick a column -- this table 
> just isn't easily searchable using simple cone-search 
> techniques.  Fortunately this is a relatively rare sort of table.
> 
> 
> 
> To my mind UCD's provide precisely the information that is 
> useful in making automated decisions about which column to 
> query. They identify the kind of information that is in the 
> column in a standard way.  When there are multiple columns 
> that have the same kind of information I don't think it's 
> reasonable to expect automated choices to be made unless 
> there is a hint from the creator of the table.
> 
> This doesn't mean that we don't want to have column names in 
> the registry. They may be helpful for directed (rather than 
> automated queries), for textual matches, and to h
