Peter Ansell wrote:
Hi Cassio,
You could try the following query, but it won't work because DBpedia
and Freebase don't use the same URIs for Freebase. The document you
get by resolving
http://dbpedia.org/resource/E.T._the_Extra-Terrestrial links to
http://rdf.freebase.com/ns/guid.9202a8c04000641f8000000000085a85 but
the freebase graph on lod.openlinksw.com/sparql contains information
about http://freebase.com/guid/9202a8c04000641f8000000000085a85 .
In addition, the Freebase mapping is not included in either of the
graphs for DBpedia or Freebase, so just putting
http://dbpedia.org/resource/E.T._the_Extra-Terrestrial into the SPARQL
query below without the freebase part, won't return any links to
either http://freebase.com/guid/9202a8c04000641f8000000000085a85 or
http://rdf.freebase.com/ns/guid.9202a8c04000641f8000000000085a85
The mapping may be in another graph, but currently you can't get the
mapping between dbpedia and freebase with the query below, that should
ideally work if both of these issues are fixed.
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX fb-film: <http://rdf.freebase.com/ns/film.film.>
SELECT ?uriFB WHERE {
GRAPH <http://dbpedia.org <http://dbpedia.org/>>
{
<http://dbpedia.org/resource/E.T._the_Extra-Terrestrial> owl:sameAs
?uriFB .
}
GRAPH <http://freebase.com <http://freebase.com/>>
{
?uriFB fb-film:tagline ?tagL
}
}
LIMIT 100
Cheers,
Peter
Peter,
DBpedia to Freebase mappings are in the Graph:
<http://dbpedia.org/freebase> .
Kingsley
*From:* cassio steel <[email protected]>
*To:* [email protected]
*Sent:* Mon, 21 June, 2010 5:48:56 AM
*Subject:* [Virtuoso-devel] Is freebase included in Virtuoso
SPARQL endpoint?
Hello everyone
how you know you can write a query on LOD using the openLink
Virtuoso SPARQL end-point ( http://lod.openlinksw.com/sparql ).
My question is: Does this end-point support freebase?
I tried to run this query:
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX fb-film: <http://rdf.freebase.com/ns/film.film.>
SELECT ?uriFB WHERE {
<http://dbpedia.org/resource/E.T._the_Extra-Terrestrial>
owl:sameAs ?uriFB .
?uriFB fb-film:tagline ?tagL
FILTER regex(str(?uriFB),"freebase")
}
LIMIT 100
but I have an empty result set, just like running any query which
involves freebase. Is there any way to interrogate freebase from
an end-point?
Thank you for your answers.
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Regards,
Kingsley Idehen
President & CEO
OpenLink Software
Web: http://www.openlinksw.com
Weblog: http://www.openlinksw.com/blog/~kidehen
Twitter/Identi.ca: kidehen
