问题
I want to extract graphs for 5 individuals who are Film(or movies) from DBPedia.
My query is:
ParameterizedSparqlString qs = new ParameterizedSparqlString( "" +
"construct{?s ?p ?o}"+
"where{?s a http://dbpedia.org/ontology/Film ."+
"?s ?p ?o"} OFFSET 0 LIMIT 5" );
I get the following result:
1- http://dbpedia.org/resource/1001_Inventions_and_the_World_of_Ibn_Al-Haytham http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://dbpedia.org/ontology/Film .
2- http://dbpedia.org/resource/1001_Inventions_and_the_World_of_Ibn_Al-Haytham http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://www.w3.org/2002/07/owl#Thing .
3- http://dbpedia.org/resource/1001_Inventions_and_the_World_of_Ibn_Al-Haytham http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://www.wikidata.org/entity/Q386724 .
4- http://dbpedia.org/resource/1001_Inventions_and_the_World_of_Ibn_Al-Haytham http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://dbpedia.org/ontology/Wikidata:Q11424 .
5- http://dbpedia.org/resource/1001_Inventions_and_the_World_of_Ibn_Al-Haytham http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://dbpedia.org/ontology/Work .
Problem: The same film is returned 5 times as all the class: Film, Thing, Q386724,WIKIdata:Q11424, and Work are equivalent class (or Subclass relation exist).
My question:
I want to return once the triple
<http://dbpedia.org/resource/1001_Inventions_and_the_World_of_Ibn_Al-Haytham>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://dbpedia.org/ontology/Film> .
and filter out the other 4 triples.
How do it please?
Thank you in advance
回答1:
I think you want this query
construct {?s a <http://dbpedia.org/ontology/Film> .}
where { ?s a <http://dbpedia.org/ontology/Film>. }
limit 5
回答2:
I think the following should work for you:
CONSTRUCT {?s ?p ?o}
WHERE {
{ SELECT DISTINCT ?s
WHERE {
?s a <http://dbpedia.org/ontology/Film> .
} LIMIT 5
}
?s ?p ?o .
}
来源:https://stackoverflow.com/questions/38249616/sparql-extract-distinct-values-from-dbpedia