- From: Kingsley Idehen <kidehen@openlinksw.com>
- Date: Thu, 08 Oct 2009 11:09:26 -0400
- To: "dbpedia-discussion@lists.sourceforge.net" <dbpedia-discussion@lists.sourceforge.net>, "public-lod@w3.org" <public-lod@w3.org>
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" )
}
--
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 15:09:58 UTC