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Re: Looking for metalex ontology

From: Bernard Vatant <bernard.vatant@mondeca.com>
Date: Tue, 30 Nov 2010 09:56:53 +0100
Message-ID: <AANLkTi=VvkaShZ1UaFLk9N0N_iJ7muGZ5f=Bb5yLKFMz@mail.gmail.com>
To: Tim Berners-Lee <timbl@w3.org>
Cc: Linking Open Data <public-lod@w3.org>, John Sheridan <johnlsheridan@yahoo.com>
Tim

Thanks for taking the time to drill down to those gory details. To follow-up
with Rinke ... ouch indeed :)

BTW seems to me (now that you eventually led me to the OWL file) there is
another way this ontology does not follow Linked Data best practices : It
does not rely on any other vocabulary, although many classes and properties
it defines could be easily find in what I call the Linked Open Vocabularies
(FOAF, Dublin Core, BIBO, FRBR etc.)
Regarding this last point I'm in the process to gather in the single dataset
how vocabularies used in the LOD cloud rely on each other. Stay tuned,
publication in the days to come, bandwidth permitting.

Best

Bernard

2010/11/30 Tim Berners-Lee <timbl@w3.org>

> 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
> ----------------------------------------------------
>
>
>


-- 
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 Tuesday, 30 November 2010 08:57:25 UTC

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