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Re: Reference: SameAs vs SameClassAs

From: Peter F. Patel-Schneider <pfps@research.bell-labs.com>
Date: Mon, 06 Jan 2003 09:46:17 -0500 (EST)
Message-Id: <20030106.094617.123586653.pfps@research.bell-labs.com>
To: michael.smith@eds.com
Cc: www-webont-wg@w3.org

From: "Smith, Michael K" <michael.smith@eds.com>
Subject: Reference: SameAs vs SameClassAs
Date: Mon, 6 Jan 2003 07:09:00 -0600 

> 
> In the semantics document 
> 
> http://www-db-out.bell-labs.com/user/pfps/owl/semantics/rdfs.html#owl_sameAs
> _rdf
> 
> SameAs is equivalent to SameIndividualAs and only implies SameClassAs.  
> But the reference states that 
>   When applied to a class, the owl:sameAs element has the same semantics as
> the owl:sameClassAs element. 
> This looks like one of those spots where the distinction between OWL DL and
> OWL Full may need to be mentioned.
> 
> - Mike

This is a problematic area of DAML+OIL that was fixed up in OWL.

In OWL sameAs means identical.  Thus sameAs implies sameClassAs (and
samePropertyAs and sameIndividualAs).

In OWL sameClassAs is weaker than sameAs.

peter
Received on Monday, 6 January 2003 09:46:28 GMT

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