- From: Miles, AJ \(Alistair\) <A.J.Miles@rl.ac.uk>
- Date: Mon, 3 Oct 2005 17:44:10 +0100
- To: <semantic-web@w3.org>, <public-esw-thes@w3.org>, <public-swbp-wg@w3.org>
So just writing this up for the benefit of all ... Requirements for URI dereferencing of RDF(S) classes and props: (1) If a person tries to dereference the URI of a class or property (i.e. via a web browser), they end up at the relevant bit of human-readable documentation. (2) If a machine tries to dereference the URI of a class or property, they end up with a serialisation of a set of RDF statements describing that class or property, with a provenance that allows differentiation of different 'versions' of an RDF schema/ontology. (3) The whole thing complies with TAG resolution on httpRange-14. E.g. Implementation with Apache 1.3 (probably works for 2.0 too although I haven't checked)for 'hash' namespace http://www.w3.org/2004/02/skos/core: In directory corresponding to URL /2004/02/skos/ there is a type-map file (e.g. 'core.var') containing the following... --- URI: core URI: core-latest-rdf Content-type: application/rdf+xml URI: core-latest-html Content-type: text/html URI: core-latest-html Content-type: text/xml URI: core-latest-html Content-type: application/xml URI: core-latest-html Content-type: application/xhtml+xml --- ... and in directory corresponding to URL /2004/02/skos/ there is a .htaccess file containing the following... --- Options -MultiViews RewriteEngine On RewriteRule ^core$ core.var RewriteRule ^core-latest-rdf$ /2004/02/skos/core/history/2005-03-31 [R=303] RewriteRule ^core-latest-html$ /TR/2005/WD-swbp-skos-core-spec-20050510 [R=303] --- N.B. this is not actually implemented for http://www.w3.org/2004/02/skos/core although it is proposed to do so. It is implemented for the dummy resource http://www.w3.org/2004/02/skos/bar to test that it works. Cheers, Al. > -----Original Message----- > From: public-swbp-wg-request@w3.org > [mailto:public-swbp-wg-request@w3.org]On Behalf Of Miles, AJ > (Alistair) > Sent: 03 October 2005 17:29 > To: Benjamin Nowack > Cc: semantic-web@w3.org; public-esw-thes@w3.org; public-swbp-wg@w3.org > Subject: RE: [VM] content-dependent redirects in apache ... help! > > > > Hi Benjamin, > > Thanks for this hint, I've got it working now. > > I added a couple of lines to the .htaccess file, so it has: > --- > Options -MultiViews > RewriteRule ^bar$ bar.var > RewriteRule ^core-latest-rdf$ > /2004/02/skos/core/history/2005-03-31 [R=303] > RewriteRule ^core-latest-html$ > /TR/2005/WD-swbp-skos-core-spec-20050510 [R=303] > --- > > Now http://www.w3.org/2004/02/skos/bar behaves as desired. > > Cheers, > > Al. > > > -----Original Message----- > > From: Benjamin Nowack [mailto:bnowack@appmosphere.com] > > Sent: 03 October 2005 16:50 > > To: Miles, AJ (Alistair) > > Cc: semantic-web@w3.org; public-esw-thes@w3.org; > public-swbp-wg@w3.org > > Subject: Re: [VM] content-dependent redirects in apache ... help! > > > > > > > > Hi Alistair, > > > > just guessing, but do you have Multiviews enabled? > > > > cheers, > > benjamin > > > > -- > > Benjamin Nowack > > > > Kruppstr. 100 > > 45145 Essen, Germany > > http://www.bnode.org/ > > > > On 03.10.2005 16:20:16, Miles, AJ \(Alistair\) wrote: > > > > > >Hi all, > > > > > >A short while ago I posted a proposed URI dereferencing > > policy & setup for > > >SKOS Core [1] as a possible candidate for future best > > practice wrt 'hash' RDF > > >namespaces. To sum up what it does: basically, if the > > client asks for html, > > >it gets redirect to the latest version of the html > > documentation, and if the > > >client asks for rdf, it gets redirected to the latest > > version of the rdf > > >description. This was to satisfy two requirements: > > > > > >(Requirement 1) property & class URIs are 'clickable' in web > > browsers and take > > >you to human readable stuff. > > > > > >(Requirement 2) provenance of any rdf statements about > > classes/props is always > > >a date-stamped version of the 'ontology', allowing > > determination of which > > >'version' is being used by an application at run-time. > > > > > >I've tried to implement this setup as a test on the W3C > > server, but have run > > >into a problem and so am posting this in the hope that those > > who know apache > > >better than me can tell me what's going on (i.e. help! :) > > > > > >I've got the following setup: > > > > > >In the directory /2004/02/skos/ there is a file 'bar.var' > > which looks like ... > > >--- > > >URI: bar > > > > > >URI: core-latest-rdf > > >Content-type: application/rdf+xml > > > > > >URI: core-latest-html > > >Content-type: text/html > > > > > >URI: core-latest-html > > >Content-type: text/xml > > > > > >URI: core-latest-html > > >Content-type: application/xml > > > > > >URI: core-latest-html > > >Content-type: application/xhtml+xml > > >--- > > > > > >I added the following lines to .htaccess in /2004/02/skos/ ... > > >--- > > >RewriteRule ^core-latest-rdf$ > > /2004/02/skos/core/history/2005-03-31 [R=303] > > >RewriteRule ^core-latest-html$ > > /TR/2005/WD-swbp-skos-core-spec-20050510 [R=303] > > >--- > > > > > >(So the idea was to test if I could make the URI > > >http://www.w3.org/2004/02/skos/bar behave how we ultimately > > want the URI > > >http://www.w3.org/2004/02/skos/core to behave). > > > > > >Now, if I try to GET http://www.w3.org/2004/02/skos/bar.var > > everything behaves > > >as I would like, with a redirect to different resources > > dependent on the > > >'Accept:' header in the original request. > > > > > >However, if I try to GET http://www.w3.org/2004/02/skos/bar > > I get a 404 not > > >found. It's obviously getting to the type-map file, because > > of the header > > >returned by the server (see below, the 'Content-Location:' > > field), but for > > >some reason is not doing the subsequent redirect. > > > > > >Here's the HTTP trace, anyone know what's going on? ... > > >--- > > >http://www.w3.org/2004/02/skos/bar > > > > > >GET /2004/02/skos/bar HTTP/1.1 > > >Host: www.w3.org > > >User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; > > rv:1.7.11) > > >Gecko/20050728 > > >Accept: > > >text/xml,application/xml,application/xhtml+xml,text/html;q=0. > > 9,text/plain;q=0.8 > > >,image/png,*/*;q=0.5 > > >Accept-Language: en-us,en;q=0.5 > > >Accept-Encoding: gzip,deflate > > >Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 > > >Keep-Alive: 300 > > >Proxy-Connection: keep-alive > > > > > >HTTP/1.x 404 Not Found > > >Date: Mon, 03 Oct 2005 15:10:16 GMT > > >Server: Apache/1.3.33 (Unix) PHP/4.3.10 > > >Content-Location: core-latest-html > > >Vary: negotiate,accept > > >TCN: choice > > >P3P: policyref="http://www.w3.org/2001/05/P3P/p3p.xml" > > >Last-Modified: Mon, 05 Sep 2005 07:47:53 GMT > > >Etag: "431bf829;43414560" > > >Accept-Ranges: bytes > > >Content-Length: 2006 > > >Content-Type: text/html; charset=iso-8859-1 > > >X-Cache: MISS from wwwcache.rl.ac.uk > > >Proxy-Connection: close > > >---------------------------------------------------------- > > >http://www.w3.org/2004/02/skos/bar > > > > > >GET /2004/02/skos/bar HTTP/1.1 > > >Host: www.w3.org > > >User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; > > rv:1.7.11) > > >Gecko/20050728 > > >Accept: application/rdf+xml > > >Accept-Encoding: gzip,deflate > > >Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 > > >Keep-Alive: 300 > > >Proxy-Connection: keep-alive > > > > > >HTTP/1.x 404 Not Found > > >Date: Mon, 03 Oct 2005 15:15:13 GMT > > >Server: Apache/1.3.33 (Unix) PHP/4.3.10 > > >Content-Location: core-latest-rdf > > >Vary: negotiate,accept > > >TCN: choice > > >P3P: policyref="http://www.w3.org/2001/05/P3P/p3p.xml" > > >Last-Modified: Mon, 05 Sep 2005 07:47:53 GMT > > >Etag: "431bf829;43414560" > > >Accept-Ranges: bytes > > >Content-Length: 2006 > > >Content-Type: text/html; charset=iso-8859-1 > > >X-Cache: MISS from wwwcache.rl.ac.uk > > >Proxy-Connection: close > > >---------------------------------------------------------- > > >http://www.w3.org/2004/02/skos/bar.var > > > > > >GET /2004/02/skos/bar.var HTTP/1.1 > > >Host: www.w3.org > > >User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; > > rv:1.7.11) > > >Gecko/20050728 > > >Accept: > > >text/xml,application/xml,application/xhtml+xml,text/html;q=0. > > 9,text/plain;q=0.8 > > >,image/png,*/*;q=0.5 > > >Accept-Language: en-us,en;q=0.5 > > >Accept-Encoding: gzip,deflate > > >Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 > > >Keep-Alive: 300 > > >Proxy-Connection: keep-alive > > > > > >HTTP/1.x 303 See Other > > >Date: Mon, 03 Oct 2005 15:15:50 GMT > > >Server: Apache/1.3.33 (Unix) PHP/4.3.10 > > >Content-Location: core-latest-html > > >Vary: negotiate,accept > > >TCN: choice > > >Location: http://www.w3.org/TR/2005/WD-swbp-skos-core-spec-20050510 > > >Content-Type: text/html; charset=iso-8859-1 > > >X-Cache: MISS from wwwcache.rl.ac.uk > > >Proxy-Connection: close > > >---------------------------------------------------------- > > >http://www.w3.org/2004/02/skos/bar.var > > > > > >GET /2004/02/skos/bar.var HTTP/1.1 > > >Host: www.w3.org > > >User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; > > rv:1.7.11) > > >Gecko/20050728 > > >Accept: application/rdf+xml > > >Accept-Encoding: gzip,deflate > > >Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 > > >Keep-Alive: 300 > > >Proxy-Connection: keep-alive > > > > > >HTTP/1.x 303 See Other > > >Date: Mon, 03 Oct 2005 15:15:43 GMT > > >Server: Apache/1.3.33 (Unix) PHP/4.3.10 > > >Content-Location: core-latest-rdf > > >Vary: negotiate,accept > > >TCN: choice > > >Location: http://www.w3.org/2004/02/skos/core/history/2005-03-31 > > >Content-Type: text/html; charset=iso-8859-1 > > >X-Cache: MISS from wwwcache.rl.ac.uk > > >Proxy-Connection: close > > >--- > > > > > >Cheers, > > > > > >Al. > > > > > >[1] > http://lists.w3.org/Archives/Public/public-esw-thes/2005Sep/0008.html > > > >--- > >Alistair Miles > >Research Associate > >CCLRC - Rutherford Appleton Laboratory > >Building R1 Room 1.60 > >Fermi Avenue > >Chilton > >Didcot > >Oxfordshire OX11 0QX > >United Kingdom > >Email: a.j.miles@rl.ac.uk > >Tel: +44 (0)1235 445440 > > > > > > > > > > >
Received on Monday, 3 October 2005 16:44:31 UTC