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Re: semantic extension

From: Antoine Zimmermann <antoine.zimmermann@emse.fr>
Date: Thu, 07 Mar 2013 20:38:42 +0100
Message-ID: <5138ECC2.5090206@emse.fr>
To: Pat Hayes <phayes@ihmc.us>
CC: RDF WG <public-rdf-wg@w3.org>
Yes, that's good.
Example OWL DL:

{
<c>  a  owl:Class;
      rdfs:subClassOf  owl:Thing .
}

does not owl-dl-entail:

{
<c>  rdfs:subClassOf  owl:Thing .
}

because the second graph does not map to an OWL DL ontology.

Le 07/03/2013 19:12, Pat Hayes a écrit :
> This has now been fixed. Check the new wording to see if you approve. What would be a good  **simple small** example from OWL-DL to illustrate this?
>
> Pat
>
> On Mar 7, 2013, at 9:20 AM, Antoine Zimmermann wrote:
>
>> Pat,
>>
>>
>> In your draft, you define semantic extension a bit differently from RDF 2004. In RDF 2004, the definition was such that OWL DL was a semantic extension of RDF by allowing extensions to make syntactic restrictions on graphs. This is not the case anymore.
>>
>> It makes the new definition cleaner, but then one may wonder what is the status of OWL DL. If we want to have:
>>
>> "if A simply entails B then A must also entail B under any extended notion of entailment"
>>
>> then OWL DL is not a semantic extension and somehow violate the conditions.
>>
>> So, I'm wondering: does it matter? do we go back to the text in 2004? or do we simply add a note that says that, of course, A and B in the sentence above must be in the language of the extension, otherwise A entails B under that semantic extension does not even mean anything.
>>
>>
>> Best,
>> --
>> Antoine Zimmermann
>> ISCOD / LSTI - Institut Henri Fayol
>> École Nationale Supérieure des Mines de Saint-Étienne
>> 158 cours Fauriel
>> 42023 Saint-Étienne Cedex 2
>> France
>> Tél:+33(0)4 77 42 66 03
>> Fax:+33(0)4 77 42 66 66
>> http://zimmer.aprilfoolsreview.com/
>>
>
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-- 
Antoine Zimmermann
ISCOD / LSTI - Institut Henri Fayol
École Nationale Supérieure des Mines de Saint-Étienne
158 cours Fauriel
42023 Saint-Étienne Cedex 2
France
Tél:+33(0)4 77 42 66 03
Fax:+33(0)4 77 42 66 66
http://zimmer.aprilfoolsreview.com/
Received on Thursday, 7 March 2013 19:39:10 GMT

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