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Re: [closed] pfps-05 RDFS Closure Rules

From: pat hayes <phayes@ai.uwf.edu>
Date: Tue, 22 Apr 2003 12:17:46 -0500
Message-Id: <p05111b01bacb287ce442@[10.0.100.12]>
To: "Peter F. Patel-Schneider" <pfps@research.bell-labs.com>
Cc: www-rdf-comments@w3.org

>From: pat hayes <phayes@ai.uwf.edu>
>Subject: [closed] pfps-05 RDFS Closure Rules
>Date: Mon, 21 Apr 2003 18:27:55 -0500
>
>>  Peter,
>>
>>  Re. your comment
>>
>>  http://lists.w3.org/Archives/Public/www-rdf-comments/2003JanMar/0090.html
>>
>>  The editor has accepted your comment and the closure rules have been
>>  modified to cover this (and other ) cases, by incorporating
>>  existential generalization as an explicit closure rule.
>>
>>  Please reply to this email, copying www-rdf-comments@w3.org indicating
>>  whether this decision is acceptable.
>>
>>  Pat
>
>This decision is not acceptable.

....

>First, the semantic conditions for RDFS uses IC(rdfs:Container), which is
>ill-defined.  If this is changed to the meaningful ICEXT(rdfs:Container),

Contrary to my earlier response, that should be I(rdfs:Container). Sorry.

...
>
>Third, the closure rules are unable to infer any rdfs:domain or rdfs:range
>triples.  It thus appears to me that the RDFS closure procedure is still
>incomplete as it will not include triples of the form
>
>	rdf:_n rdfs:range xx .
>
>(for whatever xx is deemed to be appropriate).
>

To amplify my earlier response here, the RDFS semantic conditions on 
domain and range only give necessary, not sufficient, conditions for 
domain and range assertions to be true. Thus they do not sanction 
entailments of any assertion of a domain or range beyond those 
already asserted in an antecedent. The only inference path to such a 
conclusion is by virtue of a subProperyOf assertion applied to the 
domain or range properties.

Pat
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Received on Tuesday, 22 April 2003 13:17:48 GMT

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