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[closed] horst-01; was: RDF Semantics: RDFS entailment lemma

From: pat hayes <phayes@ihmc.us>
Date: Wed, 2 Jul 2003 18:05:17 -0500
Message-Id: <p0600122bbb2913c523e0@[]>
To: herman.ter.horst@philips.com
Cc: www-rdf-comments@w3.org


with reference to your comment

archived as horst-01.

First, many thanks for your close attention to the technical matters 
and your helpful comments, which have required the WG to re-examine 
several of its earlier decisions.

The WG has resolved
to proceed as follows.

The RDS semantic conditions on subClassOf and subPropertyOf have been 
weakened to be 'only if' rather than 'iff' conditions; under these 
conditions, the entailments that you noted are no longer valid.

Details can be checked in the current editor's draft at 
The document mentions the stronger (iff) conditions under the heading 
'extensional semantic conditions'
, and describes some inference rules which are valid under these 
stronger conditions, including rules which cover the case you describe
; but it does not claim to offer a complete set of such rules for 
these stronger conditions.

A proof of the completeness of the (somewhat shortened) list of RDFS rules
  WRT the weakened semantic conditions is provided in appendix B
. As you will see, most of the complexity of the proof has to do with 
the treatment of literals; the RDFS rules correspondence is now 
straightforward since all the semantic conditions map directly into 
forward implications.

Please reply to this message, copying www-rdf-comments@w3.org, 
indicating whether this response addresses your comment adequately.


Pat Hayes

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Received on Wednesday, 2 July 2003 19:05:20 UTC

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