- From: Quentin Reul <qreul@csd.abdn.ac.uk>
- Date: Thu, 27 Sep 2007 09:50:12 +0100
- To: Antoine Isaac <aisaac@few.vu.nl>
- CC: SWD WG <public-swd-wg@w3.org>
Hi Antoine, The goal of SKOS is to share knowledge organisation, such as thesauri over the web. Imagine that a user defines a thesaurus containing only skos:broader relations between skos:Concept. If skos:broader and skos:narrower are not transitive, a user x who wants to use this thesaurus to find all narrower concepts of a concept will have to add the relation to every concept in the thesaurus. Hence, transitivity between these relations enable a better sharing among user. Looking at [1], I realised that my question is already covered. I have reviewed the different solutions proposed. I believe that solution 4 (mixing 1 and 2), despite is cons, would be most appropriate. SKOS relations such as skos:definition and skos:altLabel offer more information about the concept described whereas skos:broader and skos:narrower describes relations between terms (in my view anyway). Furthermore, FOAF and Dublin Core are sometimes used in OWL ontologies to add information about concept or the ontology itself. Lastly, I was wondering if the group was planning on addressing the question of ambiguity between terms. Cheers, Quentin [1] http://www.w3.org/2006/07/SWD/wiki/SkosDesign/ConceptSemantics Antoine Isaac wrote: > Hi Quentin, >> >> I understood that skos:narrower and skos:broader are inverses. And I >> guess my question is actually going to be covered as part of the f2f >> in Amsterdam [1] in a few weeks time. My personal opinion is that >> these should be transitive in a similar manner to rdfs:subClass in OWL >> especially if users want to be able to get information through inference. > > Do you have a specific application which requires this? For the moment > my personal opinion is rather not enthousiastic about transitivity, and > it's grounded in some practical concerns. I guess other workgroup member > will come with strong arguments for transitivity, but the more practical > cases we can discuss, the better... > >> >> Another question that comes to mind is whether SKOS is intended to be >> used as stand-alone or within an ontology. As part of the project I >> work on, we have used SKOS properties such as skos:definition to >> define concept label in OWL ontologies. But I also can see some >> applications where SKOS can be used to represent thesaurus on its own. > > Your sentence is unclear: do my scribblings in [1] cover this problem? > > Cheers, > > Antoine > > [1] http://www.w3.org/2006/07/SWD/wiki/SkosDesign/ConceptSemantics >> >> >> Sean Bechhofer wrote: >>> >>> On 24 Sep 2007, at 11:41, Quentin Reul wrote: >>> >>>> Hi, >>>> >>>> I have looked at different aspects of SKOS and I have got a few >>>> questions as a result: >>>> >>>> First of all, I was wondering if there was any reasoner available to >>>> create a thesaurus tree and find out all the different terms that >>>> are "broader/narrower" for a given term. >>>> >>>> My understanding is that the "broader/narrower" relationship is >>>> transitive, i.e. if the user adds a term has being broader, this >>>> term would have the previous term as narrower without having to add >>>> the statement to the second term. >>> >>> Broader/narrower are intended to be *inverses*, which I think is what >>> you mean here. >>> >>> The transitivity of broader/narrower is one of the topics that's up >>> for discussion at the F2F. See "Semantic Relation Properties" in [1]. >>> >>> Cheers, >>> >>> Sean >>> >>> [1] http://www.w3.org/2006/07/SWD/wiki/AmsterdamAgenda >>> >>> -- >>> Sean Bechhofer >>> School of Computer Science >>> University of Manchester >>> sean.bechhofer@manchester.ac.uk >>> http://www.cs.manchester.ac.uk/people/bechhofer >>> >>> >> ------------------------------------------------------------------------ >> >> Quentin H. Reul >> Computing Science >> University of Aberdeen >> >> +44 (0)1224 27 *4485* >> qreul@csd.abdn.ac.uk >> http://www.csd.abdn.ac.uk/~qreul >> >> >> > > > > > -- ------------------------------------------------------------------------ Quentin H. Reul Computing Science University of Aberdeen +44 (0)1224 27 *4485* qreul@csd.abdn.ac.uk http://www.csd.abdn.ac.uk/~qreul
Received on Thursday, 27 September 2007 08:50:37 UTC