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Re: Namespace Identifiers - URI, URN, URL?

Subject: Re: Namespace Identifiers - URI, URN, URL?
From: "Michael Beddow" <mbnospam@xxxxxxxxxxx>
Date: Wed, 29 Aug 2001 16:25:22 +0100
uri urn unique identifier
> My guess is that this would be an alias contained within the XML

Well, a unique identifier (for which "xsl" is then one of an unlimited
number of possible local aliases), yes

> because if it was an actual URL, then the earlier versions of the
> parser would not have to be upgraded.

Alas, another plausible misunderstanding the W3C have inflicted on us by
using URIs for unique identifiers. The XSL namespace identifiers do
happen to be resolvable URLs, but under no circumstances could an XML
processor be allowed to resolve them in order to obtain updateable
information about what they identify. If that were allowed, they
wouldn't be unique identifiers. A "unique" identifier cannot identify
one thing today and a different thing tomorrow.

It would be an equivalent error to suggest the Microsoft could have
"solved" the "compatability mode" woes over MSXML by assigning the same
CLSID to successive releases of MSXML.  Of course, nobody would make
such a suggestion about CLSIDs because their format, unlike URI's,
doesn't invite such confusions.

Michael Beddow   http://www.mbeddow.net/
XML and the Humanities page:  http://xml.lexilog.org.uk/

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list

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