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Re: Are duplicate property/value pairs permitted for a resource?

From: John Cowan <cowan@locke.ccil.org>
Date: Fri, 09 Apr 1999 15:19:32 -0400
Message-ID: <370E52C4.65FBD619@locke.ccil.org>
To: "Eric Prud'hommeaux" <eric@w3.org>
CC: Samuel Yang <syang@peoplemoverinc.com>, "'Dan Brickley'" <Daniel.Brickley@bristol.ac.uk>, "'www-rdf-comments@w3.org'" <www-rdf-comments@w3.org>, "'rdf-dev@mailbase.ac.uk'" <rdf-dev@mailbase.ac.uk>
Eric Prud'hommeaux wrote:

> app1 adds (#A, #B, "2")
> app2 adds (#A, #B, "2")
> app1 dels (#A, #B, "2")
> app2 queries for (#A, #B) values and should get "2".

That depends on what the semantics of deleting statements might be.
If deleting a statement merely means that *you* are no longer
asserting it, then the above is correct, but has nothing to do
with literals: all would be the same if "2" were replaced by #C.

But if deletion means that the statement is not *true*, then app2 should
fail.

In general RDF has no mechanism for dealing with agents who think
they know contradictory things.

-- 
John Cowan	http://www.ccil.org/~cowan		cowan@ccil.org
	You tollerday donsk?  N.  You tolkatiff scowegian?  Nn.
	You spigotty anglease?  Nnn.  You phonio saxo?  Nnnn.
		Clear all so!  'Tis a Jute.... (Finnegans Wake 16.5)
Received on Friday, 9 April 1999 15:19:48 GMT

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