W3C home > Mailing lists > Public > w3c-rdfcore-wg@w3.org > September 2001

Re: model theory publication draft

From: Pat Hayes <phayes@ai.uwf.edu>
Date: Wed, 19 Sep 2001 18:52:14 -0500
Message-Id: <p05101025b7cedfd93220@[]>
To: jos.deroo.jd@belgium.agfa.com
Cc: w3c-rdfcore-wg@w3.org
>  > If anyone wants to focus, I'd suggest looking at the stuff on RDF
>>  entailment. Here's a question that occurred to me, for example.
>>  Suppose we know that
>>  aaa rdf:type bbb .
>>  and also
>>  bbb rdfs:subClassOf ccc .
>>  Now, it follows that aaa is in fact a member of the class ccc; but do
>>  we want to say that this means that
>>  aaa rdf:type ccc
>>  must be true? If we do, that table of RDF entailment rules would need
>>  some more entries. Right now it reflects the view that being in a
>>  class doesn't necessarily mean having that class as a type, only
>>  having some subclass of it as a type.
>so far, I was assuming yes (to your question)
>and I thought you expressed that in the second last
>entry of your table for RDFS entailment, no?
>or (in notation 3)
>   { ?x a ?C. ?C rdfs:subClassOf ?D } log:implies { ?x a ?D }.
>and similarly for rdfs:subPropertyOf
>   { ?s ?p ?o. ?p rdfs:subPropertyOf ?q } log:implies { ?s ?q ?o }.
>I just see a typo in entry 2: BBB or bbb

Yes, there were a bunch of typos like that which are now fixed, I 
hope. Try again in a few hours or tomorrow.


>Jos De Roo, AGFA http://www.agfa.com/w3c/jdroo/

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Received on Wednesday, 19 September 2001 19:52:24 UTC

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