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RE: Uniform access to descriptions

From: Williams, Stuart (HP Labs, Bristol) <skw@hp.com>
Date: Tue, 8 Apr 2008 16:10:59 +0000
To: "wangxiao@musc.edu" <wangxiao@musc.edu>
CC: Jonathan Rees <jar@creativecommons.org>, "www-tag@w3.org WG" <www-tag@w3.org>, Phil Archer <parcher@icra.org>
Message-ID: <9674EA156DA93A4F855379AABDA4A5C611CE63DD49@G5W0277.americas.hpqcorp.net>


> -----Original Message-----
> From: www-tag-request@w3.org [mailto:www-tag-request@w3.org]
> On Behalf Of Xiaoshu Wang
> Sent: 08 April 2008 13:07
> To: Phil Archer
> Cc: Jonathan Rees; www-tag@w3.org WG
> Subject: Re: Uniform access to descriptions
> Phil Archer wrote:
> > Can I ask whether those interested in this issue feel that there is an
> > emerging consensus? If so, would anyone care to take a stab at a
> > timeline for an eventual resolution? If not, might it be worth setting
> > up an ad hoc telecon some time so we can discuss it?
> >
> > I ask because POWDER is now working towards making a Last Call
> > announcement at the end of the month with a view to reaching CR before
> > we all disappear on summer holiday. It would clearly be advantageous
> > if we can have a clear idea of where the HTTP Link (or alternative
> > solution) is likely to be by then.
> I would rather you NOT to make any solution until TAG reconsider the
> httpRange-14 (the definition of information resource and the meaning of
> 303).  I have mentioned a few times in the past few weeks.

Well... from the TAG's point of view the issue, specifically httpRange-14 is resolved and has *not* been reopened. Much of it's history is captured in our current and former issues list [1,2].

Wrt to that resolution... a 303 response means *nothing*... if you happen to follow the redirection and find something useful about the thing you originally inquired of, that you trust and are prepared to stick in your reasoning engine, then you win - if not, of itself, the redirection has told you nothing/means nothing.

200 tells you that the response convey as representation of the (state of?) referenced thing.

At present I do not hear TAG members asking that that the issue be reopened (and it would take a majority vote of the TAG to do so).

In addition the TAG has recently invested considerable time commenting and helping SWEO conclude its "Cool URIs for the Semantic Web" [3] Note which is specifically intended to provide practical guidance to people minting/deloy URIs for use on the Semantic Web in adherance with the TAG's resolution on httpRange-14.

httpRedirections-57 [4] is a different issue. from [5]:

"At their meeting in 16th July 2007 [1] the TAG resolved to create a new issue, HttpRedirections-57 as a response to a community request [2] that we give further consideration to the use of the HTTP 303 status codes *and* other possible mechanisms of obtaining a description of a resource (typically a non-information resource) where the referenced resource is not capable of providing representations of itself."

It is largely motivated because of practical difficulties encountered by some in implementing the TAGs 303 advice and seeking equivalent mechanisms to the same end.

> The issue is *very serious* so is its long term consequence.

Proof by assertion is not going to work.

Please state as briefly as you can what those consequences are and why they follow for the TAGs httpRange-14 resolution - one or two short paragraphs. Or better still provide a reference to a pre-existing compact description that you feel we have failed to consider.

Then please be patient and who anyone else is in agreement. More particularly, see if you obtain agreement from a current TAG participant... in which case they may ask that httpRange-14 be revisited.

> If you need a solution for your particular domain, such as POWDER, do it
> in whatever way you think is necessary, such as an HTTP POWER header,
> but just DO NOT make it a formal recommendation for HTTP,
> such as LINK.
> Xiaoshu
> Xiaoshu

Thank you,

Stuart Williams
co-chair, W3C TAG.
[1] http://www.w3.org/2001/tag/issues#httpRange-14
[2] http://www.w3.org/2001/tag/group/track/issues/14
[3] http://www.w3.org/TR/2008/NOTE-cooluris-20080331/
[4] http://www.w3.org/2001/tag/group/track/issues/57
[5] http://lists.w3.org/Archives/Public/www-tag/2007Aug/0045
[6] http://lists.w3.org/Archives/Public/www-tag/2007Jul/0034

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Received on Tuesday, 8 April 2008 16:15:26 UTC

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