- From: Brian McBride <bwm@hplb.hpl.hp.com>
- Date: 2003年1月23日 19:51:17 +0000
- To: marc@jfcarrion.com, www-rdf-comments@w3.org
- Message-Id: <5.1.0.14.0.20030123193755.0a9f3730@localhost>
Hi Marc, This message has been posted to the RDF comments mailing list and I note also the discussion on RDF interest beginning with: http://lists.w3.org/Archives/Public/www-rdf-interest/2003Jan/0140.html I understand that what you would like to be able to do is to express the fact that given: sc1 rdfs:subClassOf c . sc2 rdfs:subClassOf c . c rdf:type rdfs:Abstract . there are no instances of c that are not instances of either sc1 or sc2. This is fraught with difficulties for a number of reasons: 1. you want to express a negation. that is beyond the expressive power of RDF, and would be a major change to introduce. 2. you want to express a closed world assumption. how do I know that there is not an sc3 that you just haven't told me about. If you need this sort of expressive power, then you need a powerful language such as daml+oil or owl. At 07:27 23/01/2003 -0800, Marc Carrion wrote: [...] > > > > > > PS: Just a thought. 'rdfs:seeAlso' > > 'rdfs:domain' > > >is 'rdf:Resource', the last resource defined in the > > >new schema > > > <rdf:Description > > >rdf:about="http://www.w3.org/2000/01/rdf-schema#"> > > > <rdfs:seeAlso > > > >rdf:resource=http://www.w3.org/2000/01/rdf-schema-more#"/> > > > </rdf:Description> > > > http://www.w3.org/2000/01/rdf-schema# is > > not > > >a 'rdf:Resource', On what basis do you say that? To RDF, anything identified by an RDF URI Reference is a resource. Brian
Received on Thursday, 23 January 2003 14:51:34 UTC