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Re: [closed] pfps-05

From: Peter F. Patel-Schneider <pfps@research.bell-labs.com>
Date: Thu, 29 May 2003 06:40:50 -0400 (EDT)
Message-Id: <20030529.064050.115624298.pfps@research.bell-labs.com>
To: phayes@ai.uwf.edu
Cc: www-rdf-comments@w3.org, brian_mcbride@hp.com, danbri@w3.org, em@w3.org

This appears to have solved the particular example that presented.  

I note, however, that there have been significant changes to the RDF and
RDFS semantics that impact the RDFS closure rules.  I also note that there
are further changes to the RDF semantics that may affect the correctness of
the RDFS closure rules.  I feel that a complete review of the RDF semantics
is needed after these changes have been performed before the correctness of
the RDFS closure rules can be determined.

For example, I am currently unable to determine whether the following
entailment

     ex:foo ex:prop "a"^^foo:bar  .

	entails

     ex:foo ex:prop _:x  .
     _:x rdf:type rdfs:Resource .

can be deduced from the RDFS closure rules.

I feel that this issue has been prematurely closed.

Peter F. Patel-Schneider
Bell Labs Research
Lucent Technologies

PS:  I note that as of 6:30AM EDT 29 May 2003, none of our messages from
yesterday are visible (to me, at least) in the www-rdf-comments@w3.org
archive. 
	


From: pat hayes <phayes@ai.uwf.edu>
Subject: [closed] pfps-05
Date: Wed, 28 May 2003 21:52:57 -0500

> Peter
> 
> Re. your comment
> http://lists.w3.org/Archives/Public/www-rdf-comments/2003JanMar/0090.html
> archived as pfps-05
> http://www.w3.org/2001/sw/RDFCore/20030123-issues/#pfps-05
> The WG has decided to accept this comment:
> http://lists.w3.org/Archives/Public/w3c-rdfcore-wg/2003May/0199.html
> The closure rules have been rewritten and now contain a rule rdfs1 
> in section 4.2
>   http://www.w3.org/2001/sw/RDFCore/TR/WD-rdf-mt-20030117/#dtype_interp
> which addresses the lacuna that you noted. The exact derivation is as follows:
> 
>   using rdfs1 +  rdfs3 + rdfs7a + rdfs9
> 
>     rdfs:subClassOf rdfs:range rdfs:Class .               (sect 3.3 axiom)
>     rdf:XMLLiteral rdfs:subClassOf rdfs:Literal .     (sect 3.3 axiom)
>     rdfs:Literal rdf:type rdfs:Class .                          (by rdfs3)
>     rdfs:Literal rdfs:subClassOf rdfs:Resource .      (by rdfs7a)
> 
>     ex:foo ex:prop "a"  .
>     ex:foo ex:prop _:x  .
>     _:x rdf:type rdfs:Literal  .                              (by rdfs1 )
>     _:x rdf:type rdfs:Resource .                           (by rdfs9)
> 
> Please respond to this message, copying to www-rdf-comments@w3.org, 
> to indicate if this response is satisfactory.
> 
> Pat Hayes
> -- 
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Received on Thursday, 29 May 2003 07:40:17 GMT

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