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RE: resources and URIs

From: pat hayes <phayes@ihmc.us>
Date: Sat, 19 Jul 2003 13:41:50 -0500
Message-Id: <p06001233bb3e35be5048@[10.0.100.23]>
To: "Williams, Stuart" <skw@hp.com>
Cc: www-tag@w3.org

>Tim (or Pat),
>
>>  No, that would be illegal by my way of thinking.
>>  http://chandra.harvard.edu/NGC/ngc1068 is an information resource.
>>  You would expect
>>
>>
>>  <rdf:Description
>>  rdf:about="http://chandra.harvard.edu/NGC#ngc1068"
>>  rdf:type="http://chandra.harvard.edu/AOtype/Activegalaxy7"
>>  </rdf:Description>
>>
>>  or, in the http://chandra.harvard.edu/NGC information ressource,,
>>
>>  <rdf:Description
>>  rdf:about="#ngc1068"
>>  rdf:type="http://chandra.harvard.edu/AOtype/Activegalaxy7"
>>  </rdf:Description>
>>
>>  where you can see that local identifiers can be used to refer
>>  to abstract things, because that is what the RDF language spec says.
>
>Can you provide a reference to what the RDF language spec actually says on
>this topic, I'd like to read it for myself.

The relevant citation is probably
http://www.w3.org/2001/sw/RDFCore/TR/WD-rdf-concepts-20030117/#section-fragID

>I was under there impression that RDF gave URI References (2396 terminology)
>an entirely opaque treatment.

The semantics treats them completely opaquely: however, existing 
RDF/DAML/OWL *practice* seems to often follow the convention outlined 
by Tim, where a URIref of the form ex:place#thing  denotes an entity 
described by some RDF which can be found at the address ex:place.

Pat


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Received on Saturday, 19 July 2003 14:41:54 UTC

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