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Re: quick comment on typed literals

From: pat hayes <phayes@ai.uwf.edu>
Date: Mon, 11 Nov 2002 12:37:57 -0600
Message-Id: <p05111b1cb9f5a8ef33aa@[]>
To: Patrick Stickler <patrick.stickler@nokia.com>
Cc: w3c-rdfcore-wg@w3.org

>I don't think that the entailment requires knowledge of
>the datatype. It is just relating synonymous forms of
>expression, not adding any knowledge.

Yes, but its the datatype that tells you which are synonymous with 
which, right?

But in any case, my understanding right now is that rdf:type isn't 
going to be used in this way at all in the current version, so these 
inferences are never valid under any circumstances.


>If the typed
>literal is invalid, then the bnode triple will be invalid, but
>one does not need to ensure validity to equate the two
>forms of expression.
>_____________Original message ____________
>Subject:	Re: quick comment on typed literals
>Sender:	ext Graham Klyne <Graham.Klyne@MIMEsweeper.com>
>Date:		Mon, 11 Nov 2002 12:20:07 +0300
>Hmmm... when I stumbled across that niggle, I wondered if you might not
>introduce some "bottom" concept into the domain of interpretation, so even
>invalid lexical forms have a denotation.
>At 06:36 PM 11/6/02 -0600, pat hayes wrote:
>>In case anyone was wondering, the reason that the inference
>>aaa bbb "foo"^^ddd .
>>aaa bbb _:xxx .
>>_:xxx rdf:type ddd .
>>didnt get put into RDFS (but was left until the datatypes were introduced)
>>is because, contrary to what I first thought, this inference DOES depend
>>on access to datatype information, in order to check that 'foo' is a legal
>>lexical form according to the datatype ddd.  So even though it doesnt
>>depend on the particular value, it does need external datatype information
>>to be valid.
>>Just a quick explanation.
>>Also, after Jos' question I guess I ought to either remove that comment or
>>else put in a bit more explanation. Sigh.
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>Graham Klyne

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Received on Monday, 11 November 2002 13:37:30 UTC

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