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Re: w3.org's content negotiation for skos broken?

From: Kingsley Idehen <kidehen@openlinksw.com>
Date: Tue, 17 Aug 2010 14:09:42 +0100
Message-ID: <4C6A8A16.8010603@openlinksw.com>
To: Jörn Hees <j_hees@cs.uni-kl.de>
CC: public-lod@w3.org
  On 8/17/10 12:30 PM, Jörn Hees wrote:
> Hi all,
>
> I'm currently fiddling with a problem related to the content negotiation for
> the SKOS vocabulary:
>
> I need an rdfs:label for skos:subject, which is used quite a lot in DBpedia.
> Now the usual lookup of http://www.w3.org/2004/02/skos/core#subject magically
> redirects me to the _most recent_ version of the skos vocabulary (see
> Appendix).
> My problem with this: The most recent version does not include a definition of
> skos:subject anymore, so I don't get any label for it.
> I tried to find the historical revision manually, but I'm not able to find any
> from February 2004, but only this one:
> http://www.w3.org/2004/02/skos/core/history/2004-03-26.rdf
> (via http://www.w3.org/2004/02/skos/history )
>
> Perhaps I'm doing something wrong here (please tell me), but currently I think
> the shown behavior is malicious and not according to Linked Data guidelines.
> A lot datastores picked up this most recent revision and call it
> http://www.w3.org/2004/02/skos/core (e.g., DBpedia:
> http://dbpedia.org/sparql?default-graph-uri=&should-
> sponge=&query=select+*+from+%3Chttp%3A%2F%2Fwww.w3.org%2F2004%2F02%2Fskos%2Fcore%3E+where+{+%3Fs+%3Fp+%3Fo+}&format=text%2Fhtml&debug=on&timeout=
> )
>
> Another interesing thing: the current revision includes these namespace defs:
> xmlns:skos="http://www.w3.org/2004/02/skos/core#"
> xml:base="http://www.w3.org/2004/02/skos/core"
> Shouldn't that be 2009/08 ?
>
> Cheers,
> Jörn
>
>
> Appendix:
>
> curl -I -H'Accept: application/rdf+xml' http://www.w3.org/2004/02/skos/core
> HTTP/1.1 303 See Other
> Date: Tue, 17 Aug 2010 11:07:55 GMT
> Server: Apache/2
> Location: http://www.w3.org/TR/skos-reference/skos.rdf
> Cache-Control: max-age=21600
> Expires: Tue, 17 Aug 2010 17:07:55 GMT
> Connection: close
> Content-Type: text/html; charset=iso-8859-1
>
> curl -I -H'Accept: application/rdf+xml' http://www.w3.org/TR/skos-
> reference/skos.rdf
> HTTP/1.1 301 Moved Permanently
> Date: Tue, 17 Aug 2010 11:08:13 GMT
> Server: Apache/2
> Location: http://www.w3.org/2009/08/skos-reference/skos.rdf
> Cache-Control: max-age=21600
> Expires: Tue, 17 Aug 2010 17:08:13 GMT
> Connection: close
> Content-Type: text/html; charset=iso-8859-1
>
> curl -I -H'Accept: application/rdf+xml' http://www.w3.org/2009/08/skos-
> reference/skos.rdf
> HTTP/1.1 200 OK
> Date: Tue, 17 Aug 2010 11:09:01 GMT
> Server: Apache/2
> Last-Modified: Tue, 22 Sep 2009 14:05:46 GMT
> ETag: "70e3-4742b183e6280"
> Accept-Ranges: bytes
> Content-Length: 28899
> Cache-Control: max-age=21600
> Expires: Tue, 17 Aug 2010 17:09:01 GMT
> P3P: policyref="http://www.w3.org/2001/05/P3P/p3p.xml"
> Connection: close
> Content-Type: application/rdf+xml; qs=0.9
>
>

Off the cuff response (I am in transit etc..). I think we covered these 
matters a while back (assuming my hunch is accurate).

Links:

1. 
http://www.mail-archive.com/dbpedia-discussion@lists.sourceforge.net/msg01202.html 
-- Start
2. 
http://www.mail-archive.com/dbpedia-discussion@lists.sourceforge.net/msg01214.html 
-- Possible End.

-- 

Regards,

Kingsley Idehen	
President&  CEO
OpenLink Software
Web: http://www.openlinksw.com
Weblog: http://www.openlinksw.com/blog/~kidehen
Twitter/Identi.ca: kidehen
Received on Tuesday, 17 August 2010 13:10:12 UTC

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