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Re: possible semantic bugs concerning domain and range

From: Jim Hendler <hendler@cs.umd.edu>
Date: Wed, 25 Sep 2002 14:41:38 -0400
Message-Id: <p05111701b9b7b18689d2@[]>
To: pat hayes <phayes@ai.uwf.edu>, "Peter F. Patel-Schneider" <pfps@research.bell-labs.com>
Cc: www-webont-wg@w3.org

Seems to me we must have both if we're going to capture the notion of 
range/domain as understood by database designers (object and 
relational), object-oriented programmers, and most untrained users 
(my suspicion - cannot prove it)
  Borrowing Chris' idea of talking KR instead of OWL, here's some examples

student is a person
takeClass has range student
faculty is a person.
faculty and student are disjoint

1) X TakeClass Y  ->  X a person, X a student

2) X takeClass Y,  X oneOf (John Mary) -> X is Mary

takeclass range teenager
teenager a person
teenager and adult are disjoint

3) X takeClass Y -> X a person, X a teenager, X a student

4) X takeClass Y, X oneOf (John Mary Sam), Adult(Mary) -> X is Sam

Now, turning this back into OWL - I would expect these to be the 
semantics that most people would expect - if either RDFS has this 
wrong, or DAML has it wrong, we should fix it (either ourselves or 
via RDF Core).  If these all hold, and the debate is elsewhere, then 
I'm confused


Professor James Hendler				  hendler@cs.umd.edu
Director, Semantic Web and Agent Technologies	  301-405-2696
Maryland Information and Network Dynamics Lab.	  301-405-6707 (Fax)
Univ of Maryland, College Park, MD 20742	  240-731-3822 (Cell)
Received on Wednesday, 25 September 2002 14:41:47 UTC

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