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- From: David Megginson <firstname.lastname@example.org>
- To: Paul Prescod <email@example.com>
- Date: Fri, 28 May 1999 12:59:35 -0400 (EDT)
Paul Prescod writes:
> In the HyTime and object oriented worlds, I believe that the
> defining characteristic of things with identity is that you can
> take two references and determine if they refer to the same object.
But you cannot always take two references and determine if they do
*not* refer to the same object -- that depends on the design.
> I do not see how to do this on the Web. Consider the following URLs:
> Do they refer to the same resource? Let's try the answer both ways:
You left out the Scotch verdict, "not proven".
> I believe that the Web needs a concept of a canonical URL, if it doesn't
> already have one. Retrieving a document or the HEAD for the document
> should describe the canonical URL. I wouldn't mind if the canonical URL
> was a totally unreadable UUID as long as I can take two URLs and figure
> out whether they refer to two things that happen to have the same content
> or actually refer to the SAME THING.
Sounds like a simple enough extension to HTTP.
All the best,
David Megginson firstname.lastname@example.org
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