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RE: Which URI should be persistent when redirects are used?

From: Williams, Stuart (HP Labs, Bristol) <skw@hp.com>
Date: Thu, 27 Sep 2007 17:42:13 +0100
Message-ID: <C4B3FB61F7970A4391A5C10BAA1C3F0DE151D2@sdcexc04.emea.cpqcorp.net>
To: "Dan Connolly" <connolly@w3.org>, "Misha Wolf" <Misha.Wolf@reuters.com>
Cc: "W3C-TAG" <www-tag@w3.org>, "semantic-web-ig list" <semantic-web-ig.list@reuters.com>

Dan,

> Hmm... I think there was a whiteboard discussion and somebody 
> took a photo, but I don't see it in the in-progress minutes...
> http://www.w3.org/2001/tag/2007/09/18-tagmem-minutes.html#item04

I think may be looking for:
http://lists.w3.org/Archives/Public/www-archive/2007Sep/0061 

Stuart
--
Hewlett-Packard Limited registered Office: Cain Road, Bracknell, Berks
RG12 1HN
Registered No: 690597 England

> -----Original Message-----
> From: www-tag-request@w3.org [mailto:www-tag-request@w3.org] 
> On Behalf Of Dan Connolly
> Sent: 27 September 2007 16:14
> To: Misha Wolf
> Cc: W3C-TAG; semantic-web-ig list
> Subject: RE: Which URI should be persistent when redirects are used?
> 
> 
> On Thu, 2007-09-27 at 15:21 +0100, Misha Wolf wrote:
> > OK.  The story is ...
> 
> Ah... good to have more context... I think I see what's going 
> on up to...
> 
> > The IPTC is likely to approve the NewsML-G2 specification at our 
> > meeting in Prague in mid-October.
> > 
> > We use URIs to denote concepts associated with the News Object (as 
> > values of Subject, Genre, Creator, Title, Publisher, etc).  We want 
> > these URIs to be invariant and to participate fully in the Semantic 
> > Web.  If a receiving system uses HTTP to access information about a 
> > concept (such as Jazz, Marcel Marceau, Mona Lisa, Oil, 
> Reuters), the 
> > system hosting the taxonomy in question may have multiple 
> > representations of the taxonomy, eg:
> > -  RDF/XML
> > -  IPTC Knowledge Item
> > -  Web pages in various languages
> > 
> > So let's say that Mona Lisa has the following URIs:
> > -  the one used in News Objects
> > -  the one which will deliver the RDF/XML
> > -  the one which will deliver the Knowledge Item
> > -  the one which will deliver the Simplified Chinese Web page
> > -  the one which will deliver the Traditional Chinese Web page
> > -  the one which will deliver the Japanese Web page
> > -  the one which will deliver the International English Web page
> > -  the one which will deliver the US English Web page
> > -  etc
> > 
> > One could then write a set of assertions along the lines of:
> > -  URI-Y refers to the Simplified Chinese Web page describing URI-X
> > 
> > And it would be a Good Thing if URI-Y were invariant.
> > 
> > But (it seems to me that) it would be an even Better Thing if URI-X 
> > were invariant.
> 
> I'm not sure what you mean by "invariant"?
> 
> I suggest you choose a URI like
>   http://well-established-museum.example/great-works/mona-lisa#it
> 
> for the mona lisa, then
>   http://well-established-museum.example/mona-lisa
> is naturally a document about the mona lisa, and you can use 
> content negotation in the usual way, by storing files called
> 	mona-lisa.html.en
> 	mona-lisa.html.ja
> 	mona-lisa.rdf
> 	mona-lisa.newsml
> 
> on a suitably configured apache server.
> 
> If you're nervous about the pun between #it referring to a 
> section of an HTML document or a painting (i.e. the open TAG 
> issues fragmentInXML-28 and
> RDFinXHTML-35) you can give a 303 redirect to the .html 
> version in response to GET requests to /great-works/mona-lisa 
> from clients that seem to prefer HTML.
> 
> I'm hopeful that we'll change the MIME spec for text/html to 
> address this pun before too long, but opinions on the best 
> way to go vary, even within the TAG.
> 
> p.s. this arrangement of doing a redirect to the HTML version 
> is something Henry Thompson suggested in discussion of the 
> XML Schema namespace document.
> 
> Hmm... I think there was a whiteboard discussion and somebody 
> took a photo, but I don't see it in the in-progress minutes...
> http://www.w3.org/2001/tag/2007/09/18-tagmem-minutes.html#item04
> 
> --
> Dan Connolly, W3C http://www.w3.org/People/Connolly/
> 
> 
> 
> 
Received on Thursday, 27 September 2007 16:45:21 UTC

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