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Re: [Dbpedia-discussion] Reminder skos:subject is deprecated Re: categories at dbpedia.org/resource/category:

From: Kingsley Idehen <kidehen@openlinksw.com>
Date: Wed, 16 Dec 2009 07:03:40 -0500
Message-ID: <4B28CC9C.7050008@openlinksw.com>
To: Bernard Vatant <bernard.vatant@mondeca.com>
CC: dbpedia-discussion <dbpedia-discussion@lists.sourceforge.net>, SKOS <public-esw-thes@w3.org>, Dublin Core <DC-ARCHITECTURE@jiscmail.ac.uk>, Mitko Iliev <imitko@openlinksw.co.uk>
Bernard Vatant wrote:
> Not sure what is the answer to Amir's question is, but a side remark :
>
> skos:subject has been deprecated in the final SKOS recommendation [1] 
> and IMO should be replaced throughout DBpedia (and the linked data 
> cloud in general) by dcterms:subject [2]
> It's been discussed at length on DC list if the range of 
> dcterms:subject should be restricted or kept open as it is now, but in 
> any case using skos:Concept instances as values of this property is 
> considered a good practice from both SKOS and DC sides.
> If I remember well, skos:subject was removed from the spec on the very 
> argument that SKOS should not specify how concepts should be used for 
> indexing, letting this to metadata specifications such as Dublin Core. 
> And singularly dcterms:subject was in the radar.
>
> Should not be to difficult to change. Since DBpedia is the showcase of 
> Linked Data seems to me it should lead the way in good practice re. 
> conformance to standards :)
While this change gets synchronized (at the data set level) we can do 
the following:

1. Make an Inference Rules Context that asserts equivalence between 
dcterms:subject and skos:subject
2. Publish the rule so that when constructing SPARQL against DBpedia 
people can optionally enable the Inference Context via our SPARQL 
pragmas feature.


Kingsley
>
> Cheers
>
> Bernard
>
> [1] http://www.w3.org/TR/skos-reference/#namespace
> [2] http://purl.org/dc/terms/subject
>
>
>
> 2009/12/16 Amir Hussain <amir_hussain72@hotmail.com 
> <mailto:amir_hussain72@hotmail.com>>
>
>     Hi All,
>
>     I would like to know what are the categories are available at
>     http://dbpedia.org/resource/Category: For example the following
>     query in RED taken from dbpedia.org <http://dbpedia.org> and it
>     works well but when I try to modify with
>     http://dbpedia.org/resource/category:MotorCycle_manufacturers then
>     it does not return any thing. From where I can get available
>     categories list or dbpedia.org/resource
>     <http://dbpedia.org/resource> available resources list.
>
>
>     SELECT * WHERE {
>     ?subject skos:subject
>     <http://dbpedia.org/resource/Category:Car_manufacturers>.
>     } LIMIT 20
>
>
>     Please help me.
>
>     Regards,
>
>     Amir Hussain
>
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> -- 
> Bernard Vatant
> Senior Consultant
> Vocabulary & Data Engineering
> Tel:       +33 (0) 971 488 459
> Mail:     bernard.vatant@mondeca.com <mailto:bernard.vatant@mondeca.com>
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-- 


Regards,

Kingsley Idehen	      Weblog: http://www.openlinksw.com/blog/~kidehen
President & CEO 
OpenLink Software     Web: http://www.openlinksw.com
Received on Wednesday, 16 December 2009 12:04:25 UTC

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