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Re: Is 303 really necessary?

From: William Waites <ww@styx.org>
Date: Sun, 28 Nov 2010 14:47:34 +0100
To: Tim Berners-Lee <timbl@w3.org>
Cc: Ian Davis <lists@iandavis.com>, Richard Light <richard@light.demon.co.uk>, Linked Data community <public-lod@w3.org>
Message-ID: <20101128134734.GC13511@styx.org>
* [2010-11-27 15:24:53 -0500] Tim Berners-Lee <timbl@w3.org> écrit:

] <http://www.w3.org/2008/site/images/logo-w3c-mobile-lg.png>
] 	we know we can use to refer to the image in its PNG version.
] <http://www.w3.org/2008/site/images/logo-w3c-mobile-lg>
] 	we know nothing about.
] Because the fetch returned a content-location header,
] we are now not allowed to use that URI to refer to anything -- it could
] after all refer to the Eiffel Tour, or the W3C as an organization
] according to the new system.
] Does this make sense?

Yes and no. I see the distinction between representation and
description, but I don't think the line is necessarily so sharp. For
example, you could make
respond with,

	The W3C logo, white text on a teal background the characters
	"W" and "3" apparently raised and "C" apparently sunken. It is
	the large version of the logo intended for use with mobile

when asked for text/plain (pace "alt"). Maybe this is useful for blind
people.  For them it functions as a representation but is written
using descriptive language. I could imagine formalising the
descriptive language in RDF and returning that when asked for a
different content-type. Maybe I should do some background reading in
semiotics to get this clearer in my mind.

In the meantime,

% curl -I http://bnb.bibliographica.org/entry/GB5105626
HTTP/1.0 303 See Other
Server: nginx/0.7.65
Date: Sat, 27 Nov 2010 23:44:54 GMT
Content-Type: text/html; charset=UTF-8
Content-Length: 0
Pragma: no-cache
Cache-Control: no-cache
Vary: Accept
Location: http://bnb.bibliographica.org/entry/GB5105626.rdf
X-Cache: MISS from localhost
X-Cache-Lookup: MISS from localhost:80
Via: 1.0 localhost (squid/3.0.STABLE19)
Connection: close

William Waites
9C7E F636 52F6 1004 E40A  E565 98E3 BBF3 8320 7664
Received on Sunday, 28 November 2010 13:48:05 UTC

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