Search code examples
sparqldbpedia

SPARQL query returns no data

Why does this SPARQL query return no data? 

 PREFIX dbpedia-owl: <http://dbpedia.org/ontology/>
 PREFIX dbpedia: <http://dbpedia.org/resource/>

SELECT *
WHERE { 
    <http://dbpedia.org/resource/Louis,_Prince_of_Condé_(1530–1569)> dbpedia-owl:abstract ?abstract            
}
LIMIT 1

If you look at the DBpedia page, it shows the person has an abstract. Is it to do with the brackets in the URL? If so, how can I get round this?

Solution

  • This URI does not lead to the same result as the DBpedia page - for what ever reason. You can see this with

    PREFIX dbpedia-owl: <http://dbpedia.org/ontology/>
PREFIX dbpedia: <http://dbpedia.org/resource/>
SELECT *
WHERE { 
    <http://dbpedia.org/resource/Louis,_Prince_of_Condé_(1530–1569)> ?p ?o          
}
LIMIT 100

    But it has an owl:sameAs relation to http://dbpedia.org/resource/Louis,_Prince_of_Cond%C3%A9_(1530%E2%80%931569)

    That means if you use this URI in your query, it should work as expected. But you should indeed apply a FILTER on the language, e.g. 'en' for English abstracts.