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Re: comments on current (6 Nov) draft of RDF MT document

From: Jim Hendler <hendler@cs.umd.edu>
Date: Fri, 8 Nov 2002 09:26:53 -0500
Message-Id: <p05111704b9f179ca453d@[]>
To: Jeen Broekstra <jeen.broekstra@aidministrator.nl>, "Peter F. Patel-Schneider" <pfps@research.bell-labs.com>
Cc: www-webont-wg@w3.org

Whoops - we're getting into one of those cross-posting situations 
here.  Please note this particular email is going to webont only, not 
to rdf-comments. If you are interested in this thread, please 
contribute there to avoid cross-posting problems.  Peter, when things 
develop there that you feel are particularly relevant to us, please 
send a separate WOWG note pointing us at the conversation - otherwise 
the number of participants will yield exponentially mroe messages.
  thanks much
  -Jim Hendler
  WOWG co-chair

At 3:07 PM +0100 11/8/02, Jeen Broekstra wrote:
>Peter F. Patel-Schneider wrote:
>(Caveat: I can not find the Nov 6 WD that you are referring to, but
>  assume that it is not such a dramatic change from the April 29 version
>  that the following no longer holds).
>>  7/ The RDFS closure rules are incomplete, even if the above problems
>>  are fixed.  Therefore, the RDFS entailment lemma is false.
>>  For example, rdf:type rdfs:domain foo . a b c . RDFS-entails a
>>  rdf:type foo . because every resource has rdfs:Resource as a type, as
>>   I have pointed out before.
>Isn't this example covered by subsequent application of rdfs4a and rdfs2?
>a b c -> a rdf:type rdfs:Resource (rdfs4a)
>a rdf:type rdfs:Resource
>	& a rdfs:domain foo -> a rdf:type foo (rdfs2)
>>  Also, a b c . RDFS-entails a rdf:type rdfs:Class . because every
>>  resource is a subClassOf rdfs:Resource and, rdfs:subClassOf
>>  rdfs:domain foo . a b c . RDFS-entails a rdf:type foo . because
>>  [every resource is a subClassOf rdfs:Resource]
>I'm baffled by these two observations. Where is it specified that every
>resource is a subClassOf rdfs:Resource?
>Best regards,
>aidministrator nederland bv - http://www.aidministrator.nl/
>julianaplein 14b, 3817 cs amersfoort, the netherlands
>tel. +31-(0)33-4659987, fax. +31-(0)33-4659987

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	  240-731-3822 (Cell)
Received on Friday, 8 November 2002 09:26:58 UTC

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