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Re: WOWG: minutes Jul 10 telecon

From: Jim Hendler <hendler@cs.umd.edu>
Date: Fri, 11 Jul 2003 17:53:56 -0400
Message-Id: <p05200f13bb34e17d3c1d@[10.0.1.4]>
To: "Jos De_Roo" <jos.deroo@agfa.com>, "Dan Connolly <connolly" <connolly@w3.org>
Cc: Guus Schreiber <schreiber@cs.vu.nl>, WebOnt WG <www-webont-wg@w3.org>

At 10:21 PM +0200 7/10/03, Jos De_Roo wrote:
>[...]
>
>
>>  > 22. RDFCore Comments on OWL Reference
>>  > ACTION: Frank van Harmelen to respond to one open element (rdfs:Class
>>  > vs. owl:Class)
>>
>>  WITHDRAWN; transferred to PatH
>>
>>  ACTION PatH: draft rationale for rdfs:Class vs. owl:Class situation
>>  (less controversial than last time)
>
>I was joining late and missed the disicussion; my bad
>What I was also trying to say at the end of the telecon
>(but had no chance due to sound prloblems) was that
>I am stuck at the following:
>
>When D is a consistent OWL Lite/DL document then
>it is not necessarily a consistent OWL Full document
>
>for example the document
>
>owl:Thing owl:oneOf _:x.
>_:x rdf:first eg:a.
>_:x rdf:rest _:y.
>_:y rdf:first eg:b.
>_:y rdf:rest rdf:nil.
>
>seems to be DL consistent but Full inconsistent.
>
>We try to make our assumptions explicit in a "global" sense
>(using URI's, triples, implications and some such)
>and I can't see those for owl:Class and owl:Thing
>(seems to me that everybody could mean it's own local thing)

Jos et al -
  I'm a bit confused on the issue of full inconsistent, in part 
because I haven't been tracking the RDF Core semantics -- supposing I 
did the following in RDF

rdf:resource rdf:type eg:a.

or - suppose I said:

rdf:resource owl:equivalentTo owl:nothing.


these would surely cause problems as well, wouldn't they?  They seem 
to be syntactically legal RDF - does the semantics rule them out in 
some way?  If not, wouldn't our documents where we change owl:Thing 
(in Full) be he equivalent of changing rdf:resource since they are 
equivalent?  Guess what I'm really asking what "Full inconsistent" 
means in this sort of case...
  -JH


-- 
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)
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Received on Friday, 11 July 2003 17:54:04 GMT

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