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[SKOS] Amsterdam topic " Drawing the Pictures" (was RE: some thoughts about ISSUE 35 ConceptSchemeContainment)

From: Miles, AJ \(Alistair\) <A.J.Miles@rl.ac.uk>
Date: Fri, 5 Oct 2007 11:29:52 +0100
Message-ID: <677CE4DD24B12C4B9FA138534E29FB1D0363B820@exchange11.fed.cclrc.ac.uk>
To: "Guus Schreiber" <schreiber@cs.vu.nl>, "SWD WG" <public-swd-wg@w3.org>
Cc: <public-esw-thes@w3.org>

Hi all,

As input to discussion of "Drawing the Pictures", I've written a strawman for the semantics of skos:ConceptScheme...

[1] <http://www.w3.org/2006/07/SWD/wiki/SkosDesign/ConceptSchemes/MinimalProposal?action=recall&rev=1>

This semantics is very minimal, and quite permissive. 

At the moment, I favour this approach, because I don't think we have enough experience yet to rule anything out. We are also not trying to go beyond or reinvent what can already be done with existing technologies (SPARQL and OWL).

Note that this proposal implicitly deprecates skos:inScheme, and delegates the job of describing best practices for using rdfs:isDefinedBy instead to the SKOS Primer.

I think this proposal is compatible with Guus' below, but also should address most of the concerns raised in subsequent emails on that thread.



> -----Original Message-----
> From: public-swd-wg-request@w3.org 
> [mailto:public-swd-wg-request@w3.org] On Behalf Of Guus Schreiber
> Sent: 25 July 2007 20:59
> To: SWD WG
> Subject: some thoughts about ISSUE 35 ConceptSchemeContainment
> Issue description: http://www.w3.org/2006/07/SWD/track/issues/36
> Synopsis of the issue: SKOS provides a mechanism to indicate 
> that a concept is contained in a concept scheme (the property 
> skos:inScheme), but it is nontrivial to define such 
> containment for relation between concepts (e.g. broader/narrower).
> The whole notion of containment in a thorny one in a Semantic 
> Web setting. Note that OWL ontologies do not have a language 
> construct for this. It is understandable that some way of 
> saying that "these elements are part of my vocabulary" is 
> useful for vocabulary owners. However, it is doubtful whether 
> we can try to solve this at the level of SKOS. The reasons 
> for wanting to define containment typically have to do with 
> issues such as trust and rights. In my view such mechanisms 
> should be provided at the general RDF level. We shouldn't try 
> to solve this issue with a special-purpose construct in SKOS.
> I therefore propose to deprecate the property skos:inScheme.
> I suggest to include in our documents guidelines for how to 
> handle containment issues, e.g. by making using of 
> rdf:isDefinedBy or by relying on through guidelines for querying.
> I could also go one step further and propose to drop also the 
> class skos:ConceptScheme and the property skos:hasTopConcept. 
> Instead of skos:ConceptScheme SKOS users could just use the 
> OWL construct owl:Ontology, which also provides an import 
> construct (owl:import). 
> Finding the top concepts could just be handled at the query level. 
> However, skos:ConceptScheme (and skos:hasTopCncept) could be 
> just viewed as a useful documentation vehicle.
> Guus
Received on Friday, 5 October 2007 10:30:13 UTC

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