W3C home > Mailing lists > Public > www-webont-wg@w3.org > July 2003

RE: Proposed response to Dave Reynolds - questions from HP

From: Jim Hendler <hendler@cs.umd.edu>
Date: Tue, 22 Jul 2003 08:34:12 -0400
Message-Id: <p05200f1cbb42df9c0a80@[10.0.1.3]>
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 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Monday, 7 December 2009 10:58:01 GMT