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Re: owl:allValuesFrom and rdfs:domain

From: Jim Hendler <hendler@cs.umd.edu>
Date: Thu, 18 Dec 2003 07:44:20 -0500
Message-Id: <p05200f06bc0750872107@[]>
To: "Bernard Vatant" <bernard.vatant@mondeca.com>, public-webont-comments@w3.org

At 10:38 +0100 12/18/03, Bernard Vatant wrote:
>I need some help from experts in logic ...
>I've sent a few days ago a message about "TexasThings" example in OWL Guide
>(see below), where the interpretation of allValuesFrom seems wrong to me.
>Without answer so far from there, I push the question here.
>Suppose I have the following - more enlightening to me at least than Texas
>Things :))

Bernard - you are right that someValuesFrom is the appropriate thing 
to use -- this is a common confusion, and it is embarassing that we 
missed it in the Guide

owl:someValuesFrom requires at least one value meeting this 
restriction be there  (i.e. it is like "there exists" - it mandates 
that one exists) - there can be more than one value with the 
property, or other values without the property, but at least one if 

owl:allValuesFrom does not require a value be there, but does require 
that if there are one or more values of this property they must all 
meet this restriction

good catch

Professor James Hendler			  http://www.cs.umd.edu/users/hendler
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	  240-277-3388 (Cell)
Received on Thursday, 18 December 2003 07:46:11 UTC

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