cassio steel wrote:
I wrote this:
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/freebase>
{
<http://dbpedia.org/resource/E.T._the_Extra-Terrestrial> owl:sameAs
?uriFB .
}
GRAPH <http://dbpedia.org/freebase>
{
?uriFB fb-film:tagline ?tagL
}}
LIMIT 100
but it didn't work neither...
We are looking into this particular query.
It requires a crawl of the Freebase data from within the SPARQL Query
(which can be done via pragmas).
Examples:
http://virtuoso.openlinksw.com/presentations/SPARQL_Tutorials/SPARQL_Tutorials_Part_7/SPARQL_Tutorials_Part_7.html#(14)
Kingsley
> Date: Mon, 21 Jun 2010 10:09:34 -0400
> From: [email protected]
> To: [email protected]
> CC: [email protected]; [email protected]
> Subject: Re: [Virtuoso-devel] Is freebase included in Virtuoso
SPARQL endpoint?
>
> 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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> >
> >
> >
> >
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> >
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> > _______________________________________________
> > Virtuoso-devel mailing list
> > [email protected]
> > https://lists.sourceforge.net/lists/listinfo/virtuoso-devel
> >
>
>
> --
>
> Regards,
>
> Kingsley Idehen
> President & CEO
> OpenLink Software
> Web: http://www.openlinksw.com
> Weblog: http://www.openlinksw.com/blog/~kidehen
> Twitter/Identi.ca: kidehen
>
>
>
>
>
------------------------------------------------------------------------
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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
