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RE: Mapping to RDF Graphs and reification

From: Michael Schneider <schneid@fzi.de>
Date: Wed, 3 Dec 2008 20:57:34 +0100
Message-ID: <0EF30CAA69519C4CB91D01481AEA06A0EA6836@judith.fzi.de>
To: "Jeff Thompson" <jeff@thefirst.org>
Cc: <public-owl-dev@w3.org>
Jeff Thompson wrote: 

>In mapping OWL to RDF graphs, to make an annotation on a triple, the
>triple
>is reified into separate subject, predicate and object assertions
>similar to reification in RDF.
>
>_:x rdf:type owl:Annotation
>_:x owl:subject T(y)
>_:x owl:predicate T(AP)
>_:x owl:object T(av)
>
>But Tim Berners-Lee is still saying that reification in RDF is broken.
>See this message from last year:
>http://lists.w3.org/Archives/Public/semantic-web/2007Jan/0088.html

So what about

  _:x foaf:mbox "john.doe@example.org"
  _:x foaf:knows ex:alice
  _:x foaf:interest ex:love
  _:x foaf:knows ex:bob

in connection with

  ex:alice ex:love ex:bob

? 

>If reification in RDF is broken, and OWL adopts the same method for
>quoting a triple so that it can be annotated, does OWL inherit
>the same problems Tim has been talking about for all these years?
>
>- Jeff

Whatever the current state of RDF Reification is (or whatever some people
might believe it is), it doesn't have any consequences for the OWL 2
annotations you mention above, since there is no semantic connection between
RDF Reification and OWL 2 annotations.
 
Michael

--
Dipl.-Inform. Michael Schneider
FZI Forschungszentrum Informatik Karlsruhe
Abtl. Information Process Engineering (IPE)
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Received on Wednesday, 3 December 2008 19:58:16 GMT

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