- From: Jim Hendler <hendler@cs.umd.edu>
- Date: Tue, 22 Jul 2003 08:34:12 -0400
- To: "Jeremy Carroll" <jjc@hplb.hpl.hp.com>, "webont" <www-webont-wg@w3.org>
At 8:26 AM +0200 7/22/03, Jeremy Carroll wrote: >> Apologies - due to a cut and paste error, part of my response was >> missing - > >Jim, further cut and paste was that the last point was a different RDF Core >issue ... thanks Jeremy - I guess RDF raised bnodes twice - I'll forward this to Dave as well. -JH > >> >> - The RDF support within Jena permits users to: >> - use annonymous nodes as the object of >> more than one triple >> - have cycles of anonymous nodes >> While the syntactic restrictions between, for example, >> unnamed individuals and descriptions are understandable, >> it is not clear why OWL DL has not permitted, for example, >> an unnamed individual to be the object of more than >> one triple, or an unnamed individual to be the object >> of a triple of which it is the subject. >> Please either relax this constraint or offer a rationale. >> >> I am pasting in here the response that Peter Patel-Schneider sent to >> another comment raising this same issue - his answer can be seen in >> full in [7] >http://lists.w3.org/Archives/Public/public-webont-comments/2003Jun/0027.html >[[ >> owlsas-rdfcore-bnodes-restrictions > >We agree that there may be cause for concern, but note that the changes >requested would minimally require a major rework of the direct semantics of >OWL DL. (Section 3 of S&AS). > >We have created a new issue and postponed it, so that a future group may, >with >the benefit of deployment experience, assess whether these concerns were >legitimate, and whether the quantity of work required to attempt to address >this issue is motivated. > >We are still considering relaxing some of the constraints on bnodes >corresponding to class expressions; however, this does not seem to be your >main concern. We will notify you of any change. > >]] -- Professor James Hendler hendler@cs.umd.edu Director, Semantic Web and Agent Technologies 301-405-2696 Maryland Information and Network Dynamics Lab. 301-405-6707 (Fax) Univ of Maryland, College Park, MD 20742 *** 240-277-3388 (Cell) http://www.cs.umd.edu/users/hendler *** NOTE CHANGED CELL NUMBER ***
Received on Tuesday, 22 July 2003 08:38:02 UTC