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Re: Injective Quality (Was: Re: URIs quack like a duck)

From: Graham Klyne <GK@Dial.pipex.com>
Date: Tue, 30 May 2000 18:08:10 +0100
Message-Id: <4.3.1.2.20000530151751.00caa100@pop.dial.pipex.com>
To: "Tim Berners-Lee" <timbl@w3.org>
Cc: <xml-uri@w3.org>
Two dumb questions, if I may...

At 09:50 AM 5/30/00 -0400, Tim Berners-Lee wrote:
> >
> >  "If the name X and the name Y are different,
> >   then we know the resource identified by X is
> >   different from the resource identified by Y"
>
>
>I disagree. In fact, I would say that you can't make a system
>which scales globally in a decentralized way with that
>tautology.
>
>[[Two problems with vocabulary, by the way:
>(1) My definition of a resource is that exactly identified by a URI and so
>URIs and resources are in 1:1 mapping.

These two statements seem to be in contradiction:  if X and Y are different 
names (URIs) that identify the same resource, then URIs and resources are 
not in 1:1 mapping.  What am I missing?


> >  "If the name X and the name Y are the same,
> >   then we know the resource identified by X and
> >   the resource identified by Y are the same."
>
>
>This we do have.

I have seen this asserted a few times, but keep on asking myself:  what 
about the 'file:' URI scheme?  (I hear word of other schemes that may 
similarly depend on local context for their interpretation.)

#g


------------
Graham Klyne
(GK@ACM.ORG)
Received on Tuesday, 30 May 2000 14:25:28 UTC

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