I uploaded a set of RDF triples onto a local Virtuoso endpoint.
Of all these triples, I would like to extract only those whose subjects have at least the predicates http://www.w3.org/2000/01/rdf-schema#label and http://www.w3.org/2000/01/rdf-schema#comment .
For example, from these triples:
<http://dbpedia.org/resource/AccessibleComputing> <http://www.w3.org/2000/01/rdf-schema#label> "AccessibleComputing"@en .
<http://dbpedia.org/resource/AfghanistanGeography> <http://www.w3.org/2000/01/rdf-schema#label> "AfghanistanGeography"@en .
<http://dbpedia.org/resource/AfghanistanGeography> <http://www.w3.org/2000/01/rdf-schema#comment> " ... " .
<http://dbpedia.org/resource/Austroasiatic_languages> <http://www.w3.org/2000/01/rdf-schema#comment> " ... " .
<http://dbpedia.org/resource/AccessibleComputing> <http://dbpedia.org/ontology/wikiPageWikiLink> <http://dbpedia.org/resource/Computer_accessibility> .
<http://dbpedia.org/resource/AfghanistanGeography> <http://dbpedia.org/ontology/wikiPageWikiLink> <http://dbpedia.org/resource/Afghanistan_Geography> .
I would like to get:
<http://dbpedia.org/resource/AfghanistanGeography> <http://www.w3.org/2000/01/rdf-schema#label> "AfghanistanGeography"@en .
<http://dbpedia.org/resource/AfghanistanGeography> <http://www.w3.org/2000/01/rdf-schema#comment> " ... " .
<http://dbpedia.org/resource/AfghanistanGeography> <http://dbpedia.org/ontology/wikiPageWikiLink> <http://dbpedia.org/resource/Afghanistan_Geography> .
Is it possible to do this with one (or more) SPARQL query?
Thank you for helping
This can be done with a CONSTRUCT WHERE
query:
CONSTRUCT WHERE {
?s rdfs:label ?label.
?s rdfs:comment ?comment.
?s ?p ?o
}
This is a simplified form of CONSTRUCT
that can be used when the CONSTRUCT {}
part and the WHERE {}
part are identical.
One way is to use DESCRIBE
, eg:
DESCRIBE ?s
WHERE {
?s rdfs:label ?label .
?s rdfs:comment ?comment .
}
or alternatively with CONSTRUCT
:
CONSTRUCT { ?subject ?predicate ?object}
WHERE {
?subject ?predicate ?object .
FILTER EXISTS {
?subject rdfs:label ?label .
?subject rdfs:comment ?comment .
}
}
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