W3C home > Mailing lists > Public > www-rdf-interest@w3.org > April 2002

Re: Disambiguation; keeping the "U" in "URI"

From: Mark Baker <distobj@acm.org>
Date: Sat, 27 Apr 2002 14:11:58 -0400
To: Uche Ogbuji <uche.ogbuji@fourthought.com>
Cc: www-rdf-interest@w3.org
Message-ID: <20020427141158.O13270@www.markbaker.ca>

On Sat, Apr 27, 2002 at 09:47:35AM -0600, Uche Ogbuji wrote:
> Thanks, I did see that, but it didn't immediately bring to my mind 
> redirections.  It seemed more a bit of general info for the UA or 
> intermediates.  I didn't even get from it a sense that, say, a browser UA 
> should update the URL bar with the URI from C-L rather than the requested URL,
> which I would think as a requisite action in any redirection scenario.

It could do that on a POST response with a Content-Location header, so
that a POST response can be identified without having to resubmit the
POST (though this behaviour is unspecified in RFC 2616, I believe it's
implemented in most browsers).  But not on a GET.

>  It 
> does say that the C-L URI should become the base URI of the document, but this 
> still seems too weak a stipulation for use in redirections scenarios.

Right, it (C-L or a base URI) has nothing to do with redirection.
Redirection is specified with the Location header on a 3xx response,
not C-L.

> And now, bu mentioning content negotiation, you've caused an even deeper fog 
> about my head.  I'm also quite sure how to associate C-L with either content 
> negotiation in general (which I think of as getting a gif or png, as 
> preferred, from the *same* URL),


 and redirects from ".../" URIs to 
> ".../index.html" URLs (which seem more to me as general short-cut support than 
> anything to do with clarifying ambiguity or negotiating content).

C-L has nothing to do with redirection.

Redirection is an assertion about the identity relationship between two
resources; that they are equivalent, either for now (302), or for all
time (301).

Content-Location is a statement about the relationship between a bag of
bits (the entity body of the message) and a resource, at one point in
time (the time the request was made).

Mark Baker, Chief Science Officer, Planetfred, Inc.
Ottawa, Ontario, CANADA.      mbaker@planetfred.com
http://www.markbaker.ca   http://www.planetfred.com
Received on Saturday, 27 April 2002 14:04:56 UTC

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