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Re: owl:complementOf in OWL Full

From: Peter F. Patel-Schneider <pfps@research.bell-labs.com>
Date: Wed, 26 Feb 2003 07:32:48 -0500 (EST)
Message-Id: <20030226.073248.46629861.pfps@research.bell-labs.com>
To: jos.deroo@agfa.com
Cc: www-webont-wg@w3.org, www-webont-wg-request@w3.org

From: "Jos De_Roo" <jos.deroo@agfa.com>
Subject: Re: owl:complementOf in OWL Full
Date: Wed, 26 Feb 2003 12:31:23 +0100

> 
> >> While trying to run Sean's tests I have been falling
> >> in deep trouble with owl:complementOf in OWL Full.
> >> I really can't make sense of it in OWL Full...
> >> What does it mean in OWL Full???
> >>
> >> -- ,
> >> Jos De Roo, AGFA http://www.agfa.com/w3c/jdroo/
> >
> >The same as it means in the other dialects.  The semantic conditions for
> >owl:complementOf don't change - it is always the complement relative to
> the
> >class extension of owl:Thing.
> >
> >In OWL Full, the class extension of owl:Thing is the entire RDF domain, so
> >complements can be larger than they can be OWL DL.
> 
> So, that would then mean that e.g. the CEXT of
> owl:complementOf e.g. class owl:oneOf (:a :b)
> would contain itself, yes?

It means that 

   _:c owl:complementOf _:o .
   _:o owl:oneOf _:l1 .
   _:l1 rdf:first :a .
   _:l1 rdf:rest _:l2 .
   _:l2 rdf:first _:b .
   _:l2 rdf:rest rdf:nil .

entails (in OWL Full)

   _:c rdf:type _:c .

> would it contain the russell class?

There are no interpretations of the russell class, so I don't see how this
state of affairs could possibly arise.

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

peter
Received on Wednesday, 26 February 2003 07:32:58 GMT

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