Hi,
I maintain the German language DBpedia endpoint, and have gotten some
mails from users complaining that they don't get any results from the
endpoint when they query for resources like:
http://de.dbpedia.org/resource/München
This is the code they sent me:
String queryString= "SELECT ?o WHERE
{<http://de.dbpedia.org/resource/München>
<http://purl.org/dc/terms/subject> ?o }";
Query query = QueryFactory.create(queryString);
QueryExecution qexec =
QueryExecutionFactory.sparqlService("http://de.dbpedia.org/sparql";, query);
try {
ResultSet results = qexec.execSelect();
for (; results.hasNext();) {
QuerySolution s = results.nextSolution();
System.out.println(s.toString());
}
}
finally {
qexec.close();
}
I tried the code and it works for any IRI that contains no UTF8 chars
(so only for URIs), but when you have UTF8 chars it returns no result.
I've tried a couple of variations and it returns no result but also
doesn't throw any kind of exception, it's just as if the data wasn't there.
Then I proceeded to try an alternative method and used QueryEngineHTTP
to execute the query and it worked. However, QueryEngineHTTP messes up
the UTF8 encoding, so for example in the returned results you get
München instead of München . My guess is that QueryEngineHTTP encodes
the SPARQL results in ISO-8859-1 instead of UTF8, so decoding the
strings as ISO-8859-1 and re-encoding it as UTF8 fixed this.
Kind Regards,
Alexandru Todor
Research Associate
AG Corporate Semantic Web
Freie Universität Berlin
