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RE: DCAT Last Call issues: additional rules for skos:Concept

From: Makx Dekkers <makx@makxdekkers.com>
Date: Tue, 26 Mar 2013 14:55:15 +0100
To: "'Richard Cyganiak'" <richard@cyganiak.de>
Cc: "'Public GLD WG'" <public-gld-wg@w3.org>
Message-ID: <000401ce2a29$8c193110$a44b9330$@makxdekkers.com>
Richard,

>From your response I understand that skos:Concepts that are not a member
in a skos:ConceptScheme are not allowed as objects of dcat:theme.
Correct?

What is the reason behind that requirement? 

Are there any additional rules? For example: must all ConceptSchemes
referred to in the datasets in a catalog be asserted in
dcat:themeTaxonomy on the catalog? Or are those consistency rules left
to the implementer?


Makx Dekkers
makx@makxdekkers.com
+34 639 26 11 46



> -----Original Message-----
> From: Richard Cyganiak [mailto:richard@cyganiak.de]
> Sent: Monday, March 25, 2013 6:55 PM
> To: Makx Dekkers
> Cc: Public GLD WG
> Subject: Re: DCAT Last Call issues: additional rules for skos:Concept
> 
> On 25 Mar 2013, at 16:03, "Makx Dekkers" <makx@makxdekkers.com> wrote:
> > I would like a clarification of the usage note at
> http://www.w3.org/TR/2013/WD-vocab-dcat-20130312/#class-category-and-
> category-scheme.
> >
> > It seems to me that DCAT, as a base specification, should keep away
> from declaring properties mandatory as such recommendations would
> depend on the requirements of a particular application.
> 
> There is no mandatory property. The dcat:theme property is optional.
> The only requirement is that the subject of dcat:theme have an
> associated concept scheme.
> 
> >  Moreover, according to the SKOS specification "there are no
> conditions preventing a SKOS concept from taking part in zero, one, or
> more than one concept scheme" (http://www.w3.org/TR/skos-
> reference/#L1101) so I would think that DCAT can't require that
> skos:inScheme or skos:topConceptOf is mandatory on every skos:Concept.
> 
> DCAT doesn't require it of every skos:Concept. It requires it of the
> objects of dcat:theme only.
> 
> Best,
> Richard
> 
> 
> >
> > Makx.
> >
> >
> > Makx Dekkers
> > makx@makxdekkers.com
> > +34 639 26 11 46
> >
> >
Received on Tuesday, 26 March 2013 13:55:49 UTC

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