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Re: Reification in RDF MT (probably off-topic)

From: Graham Klyne <GK@NineByNine.org>
Date: Fri, 07 Sep 2001 18:06:52 +0100
Message-Id: <>
To: pat hayes <phayes@ai.uwf.edu>
Cc: w3c-rdfcore-wg@w3.org
At 07:51 AM 9/7/01 -0700, pat hayes wrote:
>>(Not strictly a WG topic for now, but I wanted to test my understanding...)
>>In the 28-Aug MT draft, section 4, the reification conditions are 
>>described as
>>(V union VxVxV) is a subset of IR
>><x,y> is in IEXT(I(rdf:subject)) iff for some a,b,c in V, x=<a b c> and y=a
>><x,y> is in IEXT(I(rdf:predicate)) iff for some a,b,c in V, x=<a b c> and y=b
>><x,y> is in IEXT(I(rdf:object)) iff for some a,b,c in V, x=<a b c> and y=c
>>x is in ICEXT(I(rdf:Statement)) iff for some a,b,c in V, x=<a b c>
>>This seems to say that *every* 3-tuple in VxVxV is of type rdf:Statement.
>In VxVxV, yes. Not every triple in IRxIRxIR is, of course.
>>This appears to preclude the use of the 3-tuple for any other purpose.
>Er.... .not sure what 'use' means here. You can assert anything you like 
>about the triple, since its in IR. But it is indeed of type rdf:Statement.

It's probably a red herring.  But I was wondering what would happen if one 
wanted, in future, to allow 3-tuples of resources in the domain of 
interpretation for some purpose other than representing a statement.  I 
find it difficult to imagine a useful node that wouldn't be some part of 
some statement, hence be a member of V.


Graham Klyne
Received on Tuesday, 2 October 2001 17:06:48 UTC

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