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RE: Namespace URI question

• To: "'J.Pietschmann'" <j3322ptm@y...>, Jeff Lowery <jlowery@s...>
• Subject: RE: Namespace URI question
• From: Jeff Lowery <jlowery@s...>
• Date: Thu, 12 Dec 2002 12:59:00 -0800
• Cc: "Xml-Dev (E-mail)" <xml-dev@l...>

> From: J.Pietschmann [mailto:j3322ptm@y...]
> > xmlns:foo="file:///foodom.xsd"    

> Not quite correct.
> The relevant RFC is
>   http://www.rfc-editor.org/rfc/rfc2396.txt
> (unless it has been obsoleted by a newer one recently.
> Your URL is an absolute URL. 

Okay. So the above is an absolute file URL to nowhere. 

>>  Meaning its an absolute path,
>> relative to the root-of-the-moment.
> I have no idea what this should mean.

It means I misunderstood the meaning of the URI.

> In any case, it is unusual and perhaps unwise to use a file URL
> to indentify a name space. While the spec is fuzzy enough to allow
> basically arbitrary Unicode strings, the rationale for choosing
> URIs is to uniquely identify the name space, i.e. to provide a
> string unique in the whole universe. Using HTTP URLs comes
> reasonably close to this intention.

Yep, I agree. The example I chose did not originate from me, and my
arguments for not doing this were the same as yours. But I was a bit
confused on the interpretation of file:///file.ext URI format. I see it now
as a rootless file URL, and therefore meaningless. I doesn't appear to be
officially deprecated for namespace usage, although it perhaps should be. I
can certainly see a lazy programmer using this for a short identifier, but
unwise URIs similar to this may be too to numerous to enumerate for
deprecation. 

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