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Re: "canonical" URIs

From: Mark Nottingham <mnot@mnot.net>
Date: Tue, 19 Mar 2002 16:52:06 -0800
Cc: <www-tag@w3.org>
To: "David Orchard" <david.orchard@bea.com>
Message-Id: <B395CB99-3B9C-11D6-8AEA-000A27836A68@mnot.net>

On Tuesday, March 19, 2002, at 10:04  AM, David Orchard wrote:

> TAG members,
> I don't see URI comparison officially listed as a TAG issue.  I'd like
> Joseph/Stephen's issue added to the TAG issues list.
> Equivalence rules for URIs are defined by the URI scheme.  HTTP has a
> section on URI comparison.
> However, XML does not have a default comparison function for the XML 
> Schema
> anyURI data type.  I think a reasonable approach would be to say that 
> the
> default comparision function for anyURI is to use the HTTP URI 
> comparison
> algorithm, but that it is overridable by any scheme.

I'd be wary of any default beyond string = string; anything more implies 
a fairly complete list of URIs that might be encountered, as well as 
well-understood canonicalisation for each of them; IMHO we don't have 

What would be very useful would be a canonicalisation framework along 
the lines that Tim suggested, to give spec writers something to refer to.


Mark Nottingham
Received on Tuesday, 19 March 2002 19:52:08 UTC

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