Dear DBpedians,
this is a rather odd problem (see exception below) when querying DBpedia
via JENA+SPARQL (sample code below). The query itself seems sane and can
also be executed without any problems using the web interface:
select distinct ?p where {<http://dbpedia.org/resource/Darmstadt> ?p
?o} ORDER BY ?p
The exception seems to occur when the iterator steps from
http://dbpedia.org/property/marHighC
to
http://dbpedia.org/property/marLowC
both of which do not contain any special characters or the like.
Any ideas, anyone?
Best,
Heiko
The exception I get is (message translated: "XML document structures
have to begin and end with the same element"):
javax.xml.stream.XMLStreamException: ParseError at [row,col]:[232,57]
Message: XML-Dokumentstrukturen müssen innerhalb derselben Entität
beginnen und enden.
at
com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.next(XMLStreamReaderImpl.java:592)
at
com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.getElementText(XMLStreamReaderImpl.java:836)
at
com.hp.hpl.jena.sparql.resultset.XMLInputStAX$ResultSetStAX.getOneSolution(XMLInputStAX.java:506)
at
com.hp.hpl.jena.sparql.resultset.XMLInputStAX$ResultSetStAX.hasNext(XMLInputStAX.java:231)
My code:
QueryExecution qe =
QueryExecutionFactory.sparqlService("http://dbpedia.org/sparql";,
"select distinct ?p where
{<http://dbpedia.org/resource/Darmstadt> ?p ?o} ORDER BY ?p");
ResultSet rs = qe.execSelect();
qe.close();
try {
for (; rs.hasNext();)
System.out.println(rs.next().get("p"));
} catch (Exception e) {
System.out.println(e);
}
--
Dr. Heiko Paulheim
Knowledge Engineering Group
Technische Universität Darmstadt
Phone: +49 6151 16 6634
Fax: +49 6151 16 5482
http://www.ke.tu-darmstadt.de/staff/heiko-paulheim
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