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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.

Received on Monday, 6 January 2003 09:46:28 UTC

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