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Update: DBpedia SPARQL Endpoint and Transitive Queries

From: Kingsley Idehen <kidehen@openlinksw.com>
Date: Thu, 08 Oct 2009 11:18:12 -0400
Message-ID: <4ACE02B4.9040803@openlinksw.com>
CC: "dbpedia-discussion@lists.sourceforge.net" <dbpedia-discussion@lists.sourceforge.net>, "public-lod@w3.org" <public-lod@w3.org>
Kingsley Idehen wrote:
> All,
>
> The intersection of Leigh Dodds SPARQL extensions survey [1], imminent 
> official release of Virtuoso 6.0 (DBpedia basic and Live already use 
> this, ditto LOD Cache, and B3S public endpoints), and an old post by 
> Bernard Vatant re. skos:broader, has lead to this simple, but powerful 
> example of  Virtuoso's Transitive Option extension for SPARQL :
>
> #Transitive Option Off
>
> PREFIX p: <http://dbpedia.org/property/>
> PREFIX dbpedia: <http://dbpedia.org/resource/>
> PREFIX category: <http://dbpedia.org/resource/Category:>
> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
> PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
> PREFIX geo: <http://www.georss.org/georss/>
>
> SELECT DISTINCT ?m ?n ?p ?d
> WHERE {
>   ?m rdfs:label ?n.
>   ?m skos:subject ?c.
>   ?c skos:broader category:Churches_in_Paris.
>   ?m p:abstract ?d.
>   ?m geo:point ?p
>  FILTER ( lang(?n) = "fr" )
>  FILTER ( lang(?d) = "fr" )
> }
>
> #Transitive Option On
>
> PREFIX p: <http://dbpedia.org/property/>
> PREFIX dbpedia: <http://dbpedia.org/resource/>
> PREFIX category: <http://dbpedia.org/resource/Category:>
> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
> PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
> PREFIX geo: <http://www.georss.org/georss/>
>
> SELECT DISTINCT ?m ?n ?p ?d
> WHERE {
>   ?m rdfs:label ?n.
>   ?m skos:subject ?c.
>   ?c skos:broader category:Churches_in_Paris OPTION (TRANSITIVE).
>   ?m p:abstract ?d.
>   ?m geo:point ?p
>  FILTER ( lang(?n) = "fr" )
>  FILTER ( lang(?d) = "fr" )
> }
>
>
>
Missing Link:

1. http://is.gd/43hDc -- SPARQL extensions survey by Leigh

-- 


Regards,

Kingsley Idehen	      Weblog: http://www.openlinksw.com/blog/~kidehen
President & CEO 
OpenLink Software     Web: http://www.openlinksw.com
Received on Thursday, 8 October 2009 15:18:43 UTC

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