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Re: rdfs:isDefinedBy (Was Re: Representing DCMI semantics as RDF schemas versus Web pages)

From: Patrick Stickler <patrick.stickler@nokia.com>
Date: Thu, 06 Jun 2002 15:30:56 +0300
To: ext Bill de hÓra <dehora@eircom.net>, RDF Interest <www-rdf-interest@w3.org>
Message-ID: <B92530B0.16394%patrick.stickler@nokia.com>

On 2002-06-06 15:08, "ext Bill de hÓra" <dehora@eircom.net> wrote:

> Hash: SHA1
>> -----Original Message-----
>> From: www-rdf-interest-request@w3.org
>> [mailto:www-rdf-interest-request@w3.org] On Behalf Of Patrick
>> Stickler  
>> I fully agree. http: URLs should *always* resolve to a web
>> resource.  
>> If you have a resource that is not web-accessible, you should
>> *not* denote it with an http: URL.
> Nonono. In RDF, that's looking into the URI for meaning. It is
> (another) fundamental principle of the RDF MT that a given URI is a
> constant and it has no meaning in of itself. Looking into the URI
> for meaning or processing clues; that's a hack, as you like to put
> it. 
>> Of course, to some folks, that's either blithering nonsense
>> or heresy (or both)  But hey, it's a free world, and they're
>> free to be wrong ;-)
> They're not wrong. You won't find URI schemes in the RDF graph any
> more than you'll find XML namespaces.
> Bill de hÓra

I don't disagree with you at all Bill. In RDF, URIs are always
fully opaque.

So that, ahem, also precludes folks guessing namespace URIs to
slurp in more RDF schemas, eh?

Obviously, there's a division between the RDF level and the
application level, and yes, URIs are fully opaque at the
RDF level. But at the application level, it is fair to examine
them to do things. I'm simply then a proponent of more
precise and reliable methods of deteriming what such actions
should be.

Guessing a namespace prefix from a URI is not a precise and
reliable method.



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Patrick Stickler              Phone: +358 50 483 9453
Senior Research Scientist     Fax:   +358 7180 35409
Nokia Research Center         Email: patrick.stickler@nokia.com
Received on Thursday, 6 June 2002 08:26:55 UTC

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