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Federated SPARQL queries - bobdc.blog
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I recently discovered the SERVICE extension that Jena adds to SPARQL, letting you send subqueries off to multiple SPARQL endpoints and then combine the results.
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Two parts of this trick are non-standard SPARQL, but may become part of SPARQL 1.1: subqueries and the SERVICE keyword.
03 Jan 10
kurtisrandom: Sparqling a funk legend
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Luckily my good friend, former colleague, and Semantic Web mentor Yves Raimond created a SPARQL endpoint that queries the Musicbrainz database. The service is hosted on DBtune.org/musicbrainz and a web interface can be found here.
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The second line will fill the variable ?songs with URIs for entities for which Maceo Parker is the "foaf:maker". In DBtune/musicbrainz the foaf:maker property is use to associate a song with the song writer.
RDF Vocabulary Description Language 1.0: RDF Schema
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3.6 rdfs:label
rdfs:labelis an instance ofrdf:Propertythat may be used to provide a human-readable version of a resource's name.A triple of the form:
R rdfs:label L
states that L is a human readable label for R.
The
rdfs:domainofrdfs:labelisrdfs:Resource. Therdfs:rangeof rdfs:label isrdfs:Literal.Multilingual labels are supported using the language
tagging facility of RDF literals.
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