- From: Richard H. McCullough <rhm@cdepot.net>
- Date: Tue, 19 Nov 2002 11:45:49 -0800
- To: <rinke@lri.jur.uva.nl>, <www-rdf-interest@w3.org>
- Message-ID: <000d01c29004$430ba220$bd7ba8c0@rhm8200>
Whoops! I got a little careless there. The RDF axiom rdf:type(?x,?y) iff ?y(?x) translates to <?x> <rdf:type> <?y> iff <?x> <rdfs:subClassOf> <?y> or <?x> <rhm:individualOf> <?y> Note: rhm:individualOf is my proposal for an additional property owl:individualOf. The RDFS axiom ?y(?x) implies rdfs:Class(?y) translates to <?x> <rdfs:subClassOf> <?y> or <?x> <rhm:individualOf> <?y> implies <?y> <rdfs:subClassOf> <rdfs:Class> So, I agree with you that "?y is a Class". I think that <?y> <rdfs:subClassOf> <rdfs:Class> is the "correct" RDFS way to say "?y is a Class". I also think it's wrong; I think it should be <?y> <rdfs:subClassOf> <rdfs:Resource> because "Resource" alias "Thing" alias "existent" is the concept which subsumes all other concepts. I hope Pat Hayes will step in and correct me if I am misinterpreting his rdf-mt document. ============ Dick McCullough knowledge := man do identify od existent done knowledge haspart list of proposition ----- Original Message ----- From: Rinke Hoekstra To: 'Richard H. McCullough' ; www-rdf-interest@w3.org Sent: Tuesday, November 19, 2002 10:34 AM Subject: RE: RDF vocabulary definitions Richard, Although I am most certainly not an expert, I have some remarks below. -----Original Message----- The rdf-mt document http://www.w3.org/TR/2002/WD-rdf-mt-20021112/ says in Appendix A, "RDF Axioms": rdf:type(?x,?y) iff ?y(?x) The triple translation is <?x> <rdf:type> <?y> iff <?x> <rdfs:subClassOf> <?y> I do not agree, the appendix under “RDFS Axioms” states (slightly rewritten to avoid confusion): ?y(?x) implies rdfs:Class(?y) Which means that ?y is a class if ?x is of the type ?y. This shows that ?y(?x) does not mean that ?x is a subclass of ?y at all. Why would we need a distinction between rdf:type and rdfs:subClassOf if they were equivalent? Regards, Rinke Hoekstra --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.419 / Virus Database: 235 - Release Date: 13-11-2002 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.419 / Virus Database: 235 - Release Date: 13-11-2002
Received on Tuesday, 19 November 2002 14:45:51 UTC