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Re: Review of Reference

From: Jeff Heflin <heflin@cse.lehigh.edu>
Date: Fri, 03 Jan 2003 09:55:55 -0500
Message-ID: <3E15A47B.BFB510FA@cse.lehigh.edu>
To: Jim Hendler <hendler@cs.umd.edu>
CC: WebOnt <www-webont-wg@w3.org>

Jim Hendler wrote:
> 
> >
> >- Property elements, last para. "A property is a binary relation that
> >may or may not be defined in the ontology." Did the WG ever discuss
> >whether or not it was legal to reference a class or property that wasn't
> >defined in the ontology? I certainly would not support this. It makes it
> >even easier for errors to creep into ontologies.
> 
> I must be missing something, we had long discussion about reference
> to things outside current ontology during the imports debate in
> particular.  I can certainly say in document A that something is a
> B:foo (foo a class) where B is a different document and no imports is
> specified.  Do you mean something different by "not defined in the
> ontology"?

My apologies; in my haste to make the review deadline, I was a little
sloppy in writing my comments. The referenced paragraph seems to me to
be saying that the property may not be defined in ANY ontology (because
it then says if it isn't defined, it is assumed to have no constraints).
This is what I was wondering if the group discussed, that is, can a
legal OWL document reference B:foo when B does not have a class or
property named foo? In any case, the paragraph needs to be reworded to
make it clear what it means. It does not take into account that
properties may defined in other ontologies, so it is not clear when the
property should be assumed to have no constraints.
Received on Friday, 3 January 2003 09:55:58 GMT

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