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Re: Are *relative* URIs as namespace nemes considered harmful?

From: John Cowan <jcowan@reutershealth.com>
Date: Tue, 23 May 2000 17:53:25 -0400
Message-ID: <392AFDD5.24AC5D25@reutershealth.com>
To: Liam Quin <liam@holoweb.net>, "xml-uri@w3.org" <xml-uri@w3.org>
Liam Quin wrote:

> URLs (specifically) do not guarantee that they will return teh
> same octet stream when accessed each time. Many do not, in fact.

That's true.
> Therefore, there is *never* a guarantee that two URLs refer
> to the same resource.  Consider a URL that, when dereferenced,
> returns a random web page.  Or a document that is updated.

Whether these constitute "the same resource" is a matter of viewpoint.
As I keep saying, they certainly don't constitute the same *entity body*
(bunch of bytes with a media type), but they may be viewed as a constant

> The only way to say that two URLs refer to the same thing is
> to download them and look at what you got.  There is nothing else.

And even that proves nothing.
> If you do this, there is no long a problem with a relative URL,
> because all that matters is the resource to which that URL refers,
> not the byte sequence in the URL itself.

Well and good, but that's *not* what the Namespace Rec says.


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Received on Tuesday, 23 May 2000 17:53:47 UTC

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