Mappings (was IVOAT)

From: Alasdair Gray <agray-at-dcs.gla.ac.uk>
Date: Thu, 29 Nov 2007 09:58:48 -0000


Hi Rick, All,  

It is good to see Rick include his mappings from the UCD1 vocabulary to the IVOAT. However, I do not agree with the way in which he has linked the two vocabularies from a ideological point of view. (I am saying nothing about whether the terms in the two vocabularies that he has linked makes sense or not, I am concentrating on the way in which they are linked.)  

Rick has declared the mappings using the skos:related property and embedded these within the skos version of the vocabulary.  

First of all, I feel that the mappings between vocabularies should be kept completely separate from the skos version of the vocabulary. This allows us to

  1. Concentrate on generating clean versions of the vocabularies.
  2. Change the mappings without needing to amend the skos version of the vocabulary.
  3. Use different mappings in different circumstances if this meets our needs.

Second, I feel that the skos:related property is the wrong way to relate concepts in different vocabularies. My interpretation of the skos core, although it is not explicitly stated, is that the properties skos:related, skos:broader, and skos:narrower, are for defining relationships between concepts in a single vocabulary. We should be looking to use the SKOS mapping vocabulary specification [1] for this purpose. This provides several properties for mapping between concepts in different vocabularies. (I am in the process of declaring such mappings between the A&A Keywords and the AOIM vocabularies. Once I have completed this I will send it around the list.)    

Cheers,  

Alasdair  

  1. http://www.w3.org/2004/02/skos/mapping/spec/

Alasdair J G Gray

Research Associate: Explicator Project

http://explicator.dcs.gla.ac.uk

Computer Science, University of Glasgow

0141 330 6292  

-----Original Message-----
From: owner-semantics-at-eso.org [mailto:owner-semantics-at-eso.org] On Behalf Of Frederic V. Hessman
Sent: 28 November 2007 16:55
To: IVOA semantics
Subject: IVOAT  

The newest version of the IVOAT is now singular and it looks much nicer.  

Haven't cleaned up all the minor problems found by the SKOS validator

(mostly from IAU93!) but I'm working on it as I find the time (ha!).
 

And, of course, I'm purposefully leaving in the Ae star/Be star/

Herbig AeBe star BT/NT cunundrum which no one has yet answered.  

My version of the UCD1 docs also now includes a few linked references

to IVOAT tokens (included in the dictionary after the "prefLabel

(token)" banner), which makes for interesting comparisons of the two

vocabularies.  

Enjoy!  

Rick  

http://www.astro.physik.uni-goettingen.de/~hessman/rdf/IVOAT/index.html

http://www.astro.physik.uni-goettingen.de/~hessman/rdf/UCD1/index.html Received on 2007-11-29Z10:59:31