Re: substantive semantics change?

>Jeremy:
>[...]
>>  I don't follow the transitivity argument ...
>>
>>  G entails H if every interpretation of G is an interpretation of H.
>>
>>  this is clearly transitive, and a "counter-example" like
>>
>>  *empty*
>>    entails
>>  rdf:_1 rdf:type rdfs:Resource
>>    entails
>>  rdf:_1 rdf:type rdfs:ContainerMembershipProperty
>>
>>  is flawed because the first entailment is false according to the LC2
>>  semantics.
>
>In the LC2 semantics I read
>
>[[
>Even the empty graph has a large number of rdfs-entailments which
>are not rdf-entailments, for example all triples of the form
>
>xxx rdf:type rdfs:Resource .
>
>are true in all rdfs-interpretations of any vocabulary containing xxx.
>]]
>
>so this is about the *empty* premise graph and
>
>[[
>A set of names is referred to as a vocabulary. The vocabulary
>of a graph is the set of names which occur as the subject,
>predicate or object of any triple in the graph. Note that
>URI references which occur inside typed literals are not
>required to be in the vocabulary of the graph.
>]]
>
>so I guess xxx is in the vocabulary of the conclusion graph
>and so I don't see where the above entailment is flawed...
>

Yes, quite.

Pat

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


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Received on Wednesday, 12 November 2003 12:06:06 UTC