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Re: Issue 2.2 - Adding properties to someone else's instances

From: Jim Hendler <hendler@cs.umd.edu>
Date: Thu, 30 May 2002 11:52:06 -0400
Message-Id: <p0511171eb91bfaa96dec@[10.0.1.4]>
To: Jeff Heflin <heflin@cse.lehigh.edu>
Cc: webont <www-webont-wg@w3.org>

At 9:42 AM -0400 5/30/02, Jeff Heflin wrote:
>Jim Hendler wrote:
>>
>>    Issue 2.2 - Adding properties to someone else's instances
>>
>>  status - OPEN,
>>
>>    Proposal - CLOSE THIS ISSUE
>>
>>  Our Working group has decided to use RDF/XML as our exchange
>>  framework and that the semantics of our documents will be carried by
>>  the triple store corresponding to this document.  The basic RDF model
>>  [1] allows documents to refer to and extend the graphs represented by
>>  other documents, and thus properties can be added to instances
>>  expressed in other documents.
>
>I'm not so sure about that last sentence. I see no evidence that the RDF
>model allows documents to "refer to and extend the GRAPHS represented by
>other documents" You can certainly refer to resources using URIs, but it
>is not clear from the RDF specs if referring to a URI means you also
>refer to the entire graph in which that resource is initially defined. I
>just think we need to be careful with the wording here. Perhaps a change
>to "The basic RDF model [1] allows documents to refer to and extend the
>resources defined in other documents..." would be more appropriate.

good change, thanks.

>
>There is also a semantic issue with the word "Adding" here. In RDF, when
>you refer to a resource, does your graph automatically include all other
>properties originally defined for that resource? As far as I can tell,
>RDF does not take a position on this issue. If the answer is no, then I
>would suggest that you aren't really adding, but instead providing a
>different set of properties (I realize this is getting picky, but I
>think its important to be absolutely clear about what we mean).
>
>Jeff
>
>  > [1] http://www.w3.org/TR/REC-rdf-syntax/ a



Jeff - I'd welcome alternate wording that would be more precise and 
correct. If you, or anyone else, wants to either own the issue and 
write the closing text, or leave me as owner but send me specific 
suggestions, I'd love it
  -JH

-- 
Professor James Hendler				  hendler@cs.umd.edu
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	  240-731-3822 (Cell)
http://www.cs.umd.edu/users/hendler
Received on Thursday, 30 May 2002 11:52:46 GMT

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