W3C home > Mailing lists > Public > www-tag@w3.org > July 2002

TB16 Re: Comments on arch doc draft

From: Tim Berners-Lee <timbl@w3.org>
Date: Mon, 1 Jul 2002 14:03:09 -0400
Message-ID: <013901c22129$8f54cbb0$84001d12@w3.org>
To: "Tim Bray" <tbray@textuality.com>, <www-tag@w3.org>

> In point of fact since a URI reference optionally is relative and 
> optionally has a fragment identifier, there are naturally four classes 
> of things here.  I think we should name them, define them, and make it 
> handy for other people to use them.   Strawman language:
> "A URI reference contains a URI, which may be relative or absolute, and 
> optionally has a trailing #-delimited fragment identifier.  Thus there 
> are four classes of identifier, all of which are URI References:
> 1. URI - not relative, no fragment.  This is what is sent from an agent 
> to another in the dereferencing process.
> 2. Fragment-free URI Reference - relative allowed, no fragment.  As an 
> example, XML 1.0 requires SYSTEM identifiers to be of this class.
> 3. Absolute URI Reference - relative disallowed, fragment allowed.  In 
> practice, almost all XML namespace names are of this class.
> 4. Unrestricted URI Reference
> W3C Recommendations MUST be clear as to which class of identifiers they 
> support."

I think we should establish at the strong SHOULD level that
relative URIs should/must be allowed in a syntax wherever 
absolute ones are.

The only example I can think of where they are not
allowed (xmlns) was shown to be a problem at our Hawaii
tag face-face, when most of the GET URI for a query was
a namespace URI which could have been dramatically
shortened if made relative to the URI of the query itself!

Received on Monday, 1 July 2002 14:03:06 UTC

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