Hello everyone...
I´m Walter a master student on UFPE - Brazil. I´m really need some help on
ARQ Jena.
Recentelly I discoverd the functions on ARQ but I ´m having a little
dificult to use these functions. I´m trying to query the DBpedia using de
function afn:namespaces to find the namespaces of some resources. Here is my
code:
public static void main(String[] args) {
String URI = "http://dbpedia.org/sparql/";;
String query =
"PREFIX afn:
<http://jena.hpl.hp.com/ARQ/function#>"+
"select distinct ?s ?p ?namespace " +
"where {?s ?p ?o ." +
"filter (isURI(?s)) " +
"filter (isURI(?o))" +
"filter (afn:namespace(?s) = (afn:namespace(?o)) )}
limit 10";
QuerySPARQL(query, URI);
}
private static void QuerySPARQL(String query, String uri) {
Query queryformed = QueryFactory.create(query);
QueryExecution qe = QueryExecutionFactory.sparqlService(uri,
queryformed);
System.out.println("Pesquisando...");
String resposta = "sem resposta :(";
try {
ResultSet results = qe.execSelect();
resposta = ResultSetFormatter.asText(results,
queryformed);
}
catch (Exception e) {
e.printStackTrace();
}
finally {
qe.close();
}
System.out.println(resposta);
}
But I always recieve the error 500. Anyone could help me on this? Thanks a
lot.
Att
Walter Travassos
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