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Re: Domain/Range Woes

From: Peter F. Patel-Schneider <pfps@research.bell-labs.com>
Date: Wed, 05 Feb 2003 17:25:30 -0500 (EST)
Message-Id: <20030205.172530.68535275.pfps@research.bell-labs.com>
To: rhoads@thrupoint.net
Cc: Peter.Crowther@networkinference.com, www-rdf-interest@w3.org

Sorry, I wasn't very precise.

OWL doesn't have disjunction, instead it has a union construct.  (Which is
in many ways quite similar.)

So, this advice was to use to use unionOf from OWL.

peter


From: "Stephen K. Rhoads" <rhoads@thrupoint.net>
Subject: Re: Domain/Range Woes
Date: Wed, 5 Feb 2003 16:44:17 -0500

> Peter,
> 
> Can you elaborate on the last option -- "Use a more expressive logic such as
> OWL that allows disjunction (in its DL form) or allows you to attach range
> restrictions to classes rather than to predicates."  I don't see any
> reference in the OWL Guide to disjunction.  Or did you mean "disjoint"
> although I can't see how that would help.
> 
> How would I achieve this?  Create some kind of class extension and assign it
> as the domain of the predicate?
> 
> --- Stephen
> 
> >
> > > From: Stephen K. Rhoads [mailto:rhoads@thrupoint.net]
> > > In particular, I find that I have many predicates
> > > which apply equally to seemingly disparate types of classes.
> >
> > Could a user of your schema wish to apply your predicates to some other
> > classes of which you have not yet thought?  If this is possible, range
> > and domain constraints would seem inappropriate.
> >
> > > What are my options (short of copping out and using, for example,
> > > "movieDirectedBy" / "programDirectedBy" or "personName" /
> > > "providerName")?
> >
> > - Don't use domain/range constraints;
> >
> > - Use domain/range constraints on inherited superclasses;
> >
> > - Use a more expressive logic such as OWL that allows disjunction (in
> > its DL form) or allows you to attach range restrictions to classes
> > rather than to predicates.
> >
> 
Received on Wednesday, 5 February 2003 17:25:46 GMT

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