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Re: Meaning of URIRefs

From: pat hayes <phayes@ai.uwf.edu>
Date: Mon, 28 Oct 2002 11:46:28 -0600
Message-Id: <p05111b04b9e327a45987@[65.217.30.130]>
To: Dan Brickley <danbri@w3.org>
Cc: Charles McCathieNevile <charles@w3.org>, Sandro Hawke <sandro@w3.org>, <www-rdf-interest@w3.org>

>On Sat, 26 Oct 2002, Seth Russell wrote:
>
>>
>>  Charles McCathieNevile wrote:
>>
>>  >After all, RDF actually can allow
>>  >two contradictory statements.
>>  >
>>  Oh really?  Could you give me an example of two contradictory statements
>>  using only the RDF vocabulary?
>
>You can write contradictory claims about the world using RDF. Nothing in
>the core RDF specs allows machines to detect the goof, that's all.

This all depends on what you mean by 'contradictory'. I would say 
that you cannot in fact make contradictory claims using RDF since RDF 
has no way to express negation or opposition. What can happen is that 
two sources can make claims in RDF which *taken together with a lot 
of background knowledge* are contradictory; but until that background 
knowledge is itself put into RDF (or somehow made accessible to an 
RDF processor), then the claims either aren't in RDF or else aren't 
contradictory.

Pat



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Received on Monday, 28 October 2002 12:46:40 GMT

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