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Semantics of rdf:Statement

From: Rinke Hoekstra <hoekstra@uva.nl>
Date: Fri, 20 Jul 2007 12:36:49 +0200
Message-ID: <46A09041.8060605@uva.nl>
To: semantic-web@w3.org
CC: Alexander Boer <aboer@uva.nl>, Thomas Gordon <thomas.gordon@fokus.fraunhofer.de>
Hi all,

I have a question regarding the rdf:Statement mechanism for reification: 
what is the semantics of an rdf:Statement consisting of multiple 
subject, predicate and object properties?

As far as we can tell, the RDF spec. is silent on this issue, and leaves 
implicit whether there is a 1:1 mapping between a triple and its 
reification as a rdf:Statement.

Supposing this 1:1 mapping holds, the following RDF should be incorrect, 
or at least problematic:

<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
     <rdf:Statement rdf:ID="S1">
       <rdf:predicate rdf:resource="http://description.org/schema/Creator"/>
       <rdf:predicate rdf:resource="http://description.org/schema/Fish"/>
       <rdf:object rdf:datatype=
          "http://www.w3.org/2001/XMLSchema#string">Rinke Hoekstra
       <rdf:object rdf:datatype=
          "http://www.w3.org/2001/XMLSchema#string">Alexander Boer

The above example implicitly states that 
http://www.leibnizcenter.org/information/people/rinke-hoekstra and 
http://www.leibnizcenter.org/information/people/alexander-boer, and 
http://description.org/schema/Creator and 
http://description.org/schema/Fish pairwise point to the same resource. 
This is fine.

However, for datatype resources this is really problematic as the above 
RDF states that the *strings* "Rinke Hoekstra" and "Alexander Boer" are 
equal. Something which is clearly not true...

The W3C RDF Validator validates the above RDF as being correct. Is this 


	Rinke Hoekstra

Drs. Rinke Hoekstra

Email: hoekstra@uva.nl   Skype:  rinkehoekstra
Phone: +31-20-5253499    Fax:   +31-20-5253495
Web:   http://www.leibnizcenter.nl/users/rinke

Leibniz Center for Law,         Faculty of Law
University of Amsterdam,           PO Box 1030
1000 BA  Amsterdam,            The Netherlands

Received on Friday, 20 July 2007 10:37:14 UTC

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