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RE: [OWLWG-COMMENT] Punning and the "properties for classes" use case

From: Michael Schneider <schneid@fzi.de>
Date: Fri, 2 Nov 2007 20:37:16 +0100
Message-ID: <0EF30CAA69519C4CB91D01481AEA06A04A8DE6@judith.fzi.de>
To: "Peter F. Patel-Schneider" <pfps@research.bell-labs.com>
Cc: <public-owl-dev@w3.org>

Hi Peter!

Before I answer to your complete mail, I would like to inquire some
information about the following point:

Peter F. Patel-Schneider wrote:

> I wrote:
>
>> Let's regard for example the following situation:
>> 
>>   (1) <c1> a owl:Class .
>>   (2) <p> a owl:ObjectProperty .
>>   (3) <c1> <p> <x> .
>
>In OWL 1.1
>
>	Declaration(OWLClass(c1))
>	Declaration(ObjectProperty(p))
>	ObjectPropertyAssertion(p c1 x)
>
>which should also have
>
>	Declaration(Individual(c1))
>	Declaration(Individual(x))
>
>> While OWL-1.0-DL will not allow this combination of axioms, 
>
>Not true,
>
>	Class(c1)
>	ObjectProperty(p)
>	Individual(c1 value(p x))
>
>is valid OWL DL abstract syntax.  (It is true that the RDF translation
>for this OWL DL KB is not defined.)

If it wasn't you, I would have immediately answered that this is a syntax
error. But now I am confused. In the above three Abstract Syntax expressions
you state, the name "c1" appears both in a "Class()" expression and in a
"Individual()" expression. This is clearly against the "strictly separated
parts of the OWL universe" semantics in OWL-DL, and Abstract Syntax is not
used for OWL-Full, so this should definitly not be accepted by an OWL-DL
parser. I'm afraid that I do not know any OWL-DL validator for Abstract
Syntax, otherwise I could easily check. But even if it turned out to be
allowed, I would rather think that this is a bug in the OWL spec, not an
intended feature. Or is there some intention behind this?

Cheers,
Michael

--
Dipl.-Inform. Michael Schneider
FZI Forschungszentrum Informatik Karlsruhe
Abtl. Information Process Engineering (IPE)
Tel  : +49-721-9654-726
Fax  : +49-721-9654-727
Email: Michael.Schneider@fzi.de
Web  : http://www.fzi.de/ipe/eng/mitarbeiter.php?id=555

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Received on Friday, 2 November 2007 19:37:32 GMT

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