Hello Chris, (01)
Forget it, my remark was nonsense. If I write x rdf:type y or
y rdf:type rdfs:Class then y is a first class entity. (02)
But I don't think any RDF/RDFS/OWL semantics sees classes as sets. The RDFS
semantics entails rdfs:Class rdf:type rdfs:Class. (03)
Regards, (04)
Michael Brunnbauer (05)
On Fri, Jul 06, 2012 at 04:25:13PM -0500, Chris Menzel wrote:
> On Fri, Jul 6, 2012 at 4:05 PM, Michael Brunnbauer <brunni@xxxxxxxxxxxx>wrote:
>
> >
> > Hello Matthew,
> >
> > On Fri, Jul 06, 2012 at 09:35:02PM +0100, Matthew West wrote:
> > > CM> ... classes are extensional in OWL.
> > > Is that extensional in that the extension is the members declared in the
> > OWL ontology, or is that extensional in the sense that the members define
> > the class, but I might not know about all of them?
> >
> > I think it's extensional in the sense that classes are not first class
> > entities
> > but defined via the extension of the rdf:type property.
> >
> > http://www.w3.org/TR/rdf-mt/#sinterp
> >
>
> Actually, yes, there is an RDF-compatible semantics for OWL I'd forgotten
> about where OWL classes are simply entities that are assigned sets of
> individuals as their extensions. In this semantics, distinct classes can
> have the same "members". But IIRC in both the W3C "direct" semantics for
> OWL and the "model theoretic" semantics, OWL classes are simply sets of
> individuals.
>
> Pat will probably jump in here and straighten me out...
>
> -chris (06)
>
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