- From: Bernard Vatant <bernard.vatant@mondeca.com>
- Date: Wed, 23 Feb 2005 10:55:29 +0100
- To: <public-esw-thes@w3.org>
I also agree on leaving the skos:subject domain open. Seems to me that SKOS should be agnostic on the many possible ways concepts and concept schemes can be used for indexing, and the types of objects (resources) that are likely to be indexed. Restricting the domain of skos:subject to foaf:Document either entails extension of foaf:Document to things which will not really fit in its original semantics, or restrict too much the use of skos:subject. IMO no general inference on the class of a:foo should be possible from a general assertion like a:foo skos:subject b:someConcept I rather imagine the use of owl:Restriction to define that such type of resource is using such concept scheme, like e.g. Definition of eg:TechnicalConcept as the subClass of skos:Concept for which skos:inScheme value is eg:TechnicalTerminology <owl:Class rdf:about="http://www.eg.org#TechnicalConcept"> <rdfs:subClassOf rdf:resource="http://www.w3.org/2004/02/skos/core#Concept"/> <owl:equivalentClass> <owl:Restriction> <owl:hasValue> <skos:ConceptScheme rdf:about="http://www.eg.org#TechnicalTerminology"/> </owl:hasValue> <owl:onProperty> <owl:ObjectProperty rdf:about="http://www.w3.org/2004/02/skos/core#inScheme"/> </owl:onProperty> </owl:Restriction> </owl:equivalentClass> </owl:Class> Definition of eg:TechnicalDocument as class of resources being indexed by some eg:TechnicalConcept <owl:Class rdf:about="http://www.eg.org#TechnicalDocument"> <rdfs:subClassOf> <owl:Restriction> <owl:someValuesFrom rdf:resource="http://www.eg.org#TechnicalConcept"/> <owl:onProperty> <owl:ObjectProperty rdf:about="http://www.w3.org/2004/02/skos/core#subject"/> </owl:onProperty> </owl:Restriction> </rdfs:subClassOf> </owl:Class> >From such declarations, I could e.g. entail that a given resource is a TechnicalDocument, from the fact that it is indexed on a TechnicalConcept. Does that make sense? ********************************************************************************** Bernard Vatant Senior Consultant Knowledge Engineering bernard.vatant@mondeca.com "Making Sense of Content" : http://www.mondeca.com "Everything is a Subject" : http://universimmedia.blogspot.com ********************************************************************************** > -----Message d'origine----- > De : public-esw-thes-request@w3.org > [mailto:public-esw-thes-request@w3.org]De la part de Ian Dickinson > Envoyé : lundi 21 février 2005 14:49 > À : public-esw-thes@w3.org > Objet : Re: Question on skos:subject domain > > > > Dave Reynolds wrote (in reply to Leonard Will): > > Whilst foaf:Document is pretty generally I don't think it is supposed to > > be quite that general. For example, it would presumably be surprising to > > find something that is both a foaf:Person and a foaf:Document. > And specifically, foaf:Person and foaf:Document are declared to be > disjoint classes in the FOAF schema, so Leonard's definition is > unsatisfiable using FOAF vocabulary. > > > It would make sense to me to leave the domain of skos:subject undefined > > or to define a skos:Document which is as general as that defined in your > > glossary. > +1 > > Ian > >
Received on Wednesday, 23 February 2005 09:55:49 UTC