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[protege-owl] Define more than Subject-Predicate-Object
Steve Jonathan Tirtha
sjtirtha at gmail.com
Mon Apr 30 02:55:57 PDT 2007
thank you very much for the answer.
This url http://www.w3.org/TR/swbp-n-aryRelations/ answer my question.
But I still don't understand what do you mean with the direct model
I've not read about it, but I'll do later.
On 4/30/07, Timothy Redmond <tredmond at stanford.edu> wrote:
> On Apr 27, 2007, at 1:30 PM, Steve Jonathan Tirtha wrote:
> > Hi,
> > After studying OWL, I see, that OWL can only represent a statement/
> > knowledge in S-P-O(Subject-Predicate-Object).
> > Can I also define S-P-O-Context. I don't know the right term, so I
> > call it "Context".
> > Example: S-P-O
> > - Person signs Contract
> > - Michael signs LicenseAgreementNr.12
> > S-P-O-Context
> > - Person signs Contract on [Time Context]
> > - Michael signs LicenseAgreementNr. 12 on August
> > 12th 2006
> > [Time Context] defines when a person signs a contract.
> I think that the issue you are getting at is the problem described in
> http://www.w3.org/TR/swbp-n-aryRelations/. This is a known problem
> and that web page gives a couple of approaches for solving the problem.
> > I think, OWL can't represent more than S-P-O.
> This is a little subtle. The statement you made is quite reasonable
> for the RDF language. So one could argue that since OWL has a
> semantics based on the RDF semantics (http://www.w3.org/TR/owl-
> semantics/rdfs.html) the statement that you made also applies to
> OWL. This is a defensible position.
> However I would argue that this is not an entirely natural
> viewpoint. Say we look at a statement like
> MyFavoritePizza = Pizza and (hasTopping some SausageTopping) and
> (hasBase all ThinAndCrispyBase).
> It is possible to express the semantics of such a statement in terms
> of triples. But I would argue that the more natural semantics is the
> direct model theoretic semantics (http://www.w3.org/TR/owl-semantics/
> direct.html). There is no need to turn this statement into a
> collection of triples in order to understand its meaning.
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