- From: pat hayes <phayes@ihmc.us>
- Date: 2003年9月18日 18:34:16 -0500
- To: Dan Connolly <connolly@w3.org>
- Cc: Dan Brickley <danbri@w3.org>, www-rdf-comments@w3.org, public-webont-comments@w3.org
- Message-Id: <p06001f0dbb8fef84864b@[10.0.100.9]>
>Pat, this is perhaps a useful perspective on >the matter, but what's at issue in this >public-webont-comments forum is whether the >question is answered by the OWL specs. Well, OK. It is, but you have to kind of dig around to find it. > >Please try to answer the question from >the text of the specs. If you guys just >want to discuss this stuff free-form, please >use www-rdf-logic or whatever. Ok, the specs documents cover this issue at various places, eg see http://www.w3.org/TR/2003/CR-owl-features-20030818/#s1.3 http://www.w3.org/TR/2003/CR-owl-features-20030818/#s4 http://www.w3.org/TR/2003/CR-owl-ref-20030818/#app-DLinRDF http://www.w3.org/TR/2003/WD-owl-semantics-20030331/rdfs.html#5.1 See also the comments at http://www.w3.org/TR/2003/WD-owl-semantics-20030331/rdfs.html#5.4 which gives a more formal description of the OWL-DL restrictions on the RDFS universe. Pat >On Wed, 2003年09月17日 at 21:35, pat hayes wrote: >> [...] >> >Are all RDF classes OWL classes? >> >> No. RDFS has a more general notion of class than OWL has. In >> particular, rdfs:Class is not an OWL class. >> >> >and vice-versa? >> >> Yes. >> >> >Can this be expressed >> >with (rdfs):subClassOf? >> >> Yes, in RDFS: >> >> owl:Class rdfs:subClassOf rdfs:Class. >> >> However, this fact is 'invisible' in OWL because of the restrictions >> which have been placed on the expressivity of OWL syntax > >[...] > > >-- >Dan Connolly, W3C http://www.w3.org/People/Connolly/ -- --------------------------------------------------------------------- IHMC (850)434 8903 or (650)494 3973 home 40 South Alcaniz St. (850)202 4416 office Pensacola (850)202 4440 fax FL 32501 (850)291 0667 cell phayes@ihmc.us http://www.ihmc.us/users/phayes
Received on Thursday, 18 September 2003 19:34:17 UTC