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RE: Disjoint Properties in OWL 1.1

From: Michael Schneider <m_schnei@gmx.de>
Date: Tue, 06 Mar 2007 14:05:40 +0100
Message-ID: <45ED6724.4020706@gmx.de>
To: matthew.williams@cancer.org.uk
CC: semantic-web@w3.org, public-owl-dev@w3.org

Hi Matt!

First a hint: Please use <public-owl-dev@w3.org> for posting into the 
OWL list, not <public-owl-dev-request@w3.org>. Your mail did not reach 
the OWL list, AFAICS!

Matt Williams wrote on Tue, 06 Mar 2007 at 11:35:

> Dear All,
> 
> I'm trying to understand some of the new features in OWL 1.1, 
> specifically the disjoint properties.
> 
> If understand them correctly, then:
> 
> f1: People \exists hasPositiveIntention. Intention
> f2: People \exists hasNegativeIntention. Intention
> 
> where hasPositiveIntention and hasNegativeIntention are disjoint 
> properties then:
> 
> f1 & f2
> 
> will be non-satisfiable ?
> 
> Is that correct? Any other pointers/ gotchas in using them?
> 
> Thanks,
> 
> Matt

f1&f2 would just be the class of all those people p, which have both, at 
least one positive intention i1, and at least one negative intention i2. 
This class, of course, /can/ be satisfied, for instance by myself! ;-)

But the disjointness of the two properties would not allow that both 
intentions i1 and i2 are the /same/ for a given person p. More abstract: If

   (p,i1) \in hasPositiveIntention

then

   NOT [ (p,i1) \in hasNegativeIntention ]

and vice versa.


Cheers,
Michael
Received on Tuesday, 6 March 2007 13:06:09 GMT

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