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Re: Looking for metalex ontology

From: Tim Berners-Lee <timbl@w3.org>
Date: Mon, 29 Nov 2010 18:31:02 -0500
Cc: Linking Open Data <public-lod@w3.org>, John Sheridan <johnlsheridan@yahoo.com>
Message-Id: <559B723A-5496-45CC-B266-3840ED88E189@w3.org>
To: Bernard Vatant <bernard.vatant@mondeca.com>
Bernard,

You have been tripped up by abuse of content negotiation.

Their document says they do conneg.

cwm http://www.metalex.eu/metalex/1.0
gives you data, as cwm only asks for RDF.

Following it by hand
$ curl -H Accept:application/rdf+xml http://www.metalex.eu/metalex/1.0
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>303 See Other</title>
</head><body>
<h1>See Other</h1>
<p>The answer to your request is located <a href="http://svn.metalex.eu/svn/MetaLexWS/branches/latest/metalex-cen.owl">here</a>.</p>
<hr>
<address>Apache/2.2.11 (Ubuntu) DAV/2 SVN/1.5.4 mod_jk/1.2.26 PHP/5.2.6-3ubuntu4.6 with Suhosin-Patch mod_python/3.3.1 Python/2.6.2 mod_ruby/1.2.6 Ruby/1.8.7(2008-08-11) mod_ssl/2.2.11 OpenSSL/0.9.8g mod_perl/2.0.4 Perl/v5.10.0 Server at www.metalex.eu Port 80</address>
</body></html>
$ 

*** Note here we are a 303 which means that what we are being redirected to is NOT the
ontology, but may be relevant.  The chain of custody is broken, te site does not assert that what follows
is the ontology.  But let us follow it anyway:

Following the 303

$ curl -H Accept:application/rdf+xml http://svn.metalex.eu/svn/MetaLexWS/branches/latest/metalex-cen.owl
<?xml version="1.0"?>


<!DOCTYPE rdf:RDF [
    <!ENTITY owl "http://www.w3.org/2002/07/owl#" >
    <!ENTITY owl11 "http://www.w3.org/2006/12/owl11#" >
[...]
     xmlns:metalex="http://www.metalex.eu/metalex/2008-05-02#"
     xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
     xmlns:owl="http://www.w3.org/2002/07/owl#">
    <owl:Ontology rdf:about="">
[...]
    
*** Note that here you do get some RDF.

Tabulator can read that.  Each term is as you explore marked by a red dot to
indicate that it could not be looked up on the web.  Because:
** You do not get information about the namespace
  xmlns:metalex="http://www.metalex.eu/metalex/2008-05-02#"
instead of the one you originally asked about!

So after all that you can see what they are getting  at and how they are thinking.
But their linked data is seriously and needlessly broken.

To fix it, they should just serve the ontology with 200 from http://www.metalex.eu/metalex/1.0
and fix the namespace in it to be that. No conneg.


*** Without Firefox, however, even with tabulator, so accepting RDF or HTML, is redirected to:
http://www.cen.eu/cen/Sectors/Sectors/ISSS/CEN%20Workshop%20Agreements/Pages/MLX%20CWAs.aspx
which is a sort of a home page about the document, with copyright stuff,
but it is not the ontology.

So they are using the same URI for two documents with very different 
information, which is architecturally bad and practically messed you up.

Note that John Shedidan (Ccd) and colleagues have put the UK laws on line
with lots of RDF -- you could sync up wit them if you haven't

Moral: point tabulator at it and if it doesn't work, fix it.
	
Tim

PS: Their copyright

"CWAs are CEN copyright. Those made available for downloading are provided on the condition that they may not be modified, re-distributed, sold or repackaged in any form without the prior consent of CEN, and are only for the use of the person downloading them.  For additional copyright information, please refer to the statements on the cover pages of the CWAs concerned."   sounds as though if it applies to the ontology, which isn't obvious

On 2010-11 -29, at 14:41, Bernard Vatant wrote:

> Hi all
> 
> According to http://www.ckan.net/tag/format-metalex there are two datasets in the LOD cloud relying on metalex ontology.
> 
> But they provide different URIs for this ontology ...
> 
> http://www.best-project.nl/rechtspraak.ttl  says :
> void:vocabulary <http://www.metalex.eu/schema>
> 
> http://www.legislation.gov.uk/ukpga/1985/67/section/6/data.rdf says :
> xmlns:metalex="http://www.metalex.eu/metalex/2008-05-02#"
> 
> ... and both are dead links ...
> 
> OTOH http://www.metalex.eu/documentation/ says:
> "The namespace of the CEN MetaLex XML Schema and OWL specification is http://www.metalex.eu/metalex/1.0"
> 
> ... which redirects to ... well ...
> 
> Too bad because this metalex ontology looks really interesting :)
> 
> Pointer, someone?
> 
> Bernard
> 
> -- 
> Bernard Vatant
> Senior Consultant
> Vocabulary & Data Engineering
> Tel:       +33 (0) 971 488 459
> Mail:     bernard.vatant@mondeca.com
> ----------------------------------------------------
> Mondeca
> 3, cité Nollez 75018 Paris France
> Web:    http://www.mondeca.com
> Blog:    http://mondeca.wordpress.com
> ----------------------------------------------------


Received on Monday, 29 November 2010 23:31:06 UTC

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