Hi,
The following sparql query:
select distinct ?Concept where {[] a ?Concept
Is the default query at the dbpedia endpoint http://dbpedia.org/sparql
It returns several URI's including the following one (notice the and
sign):
http://dbpedia.org/class/yago/Bill&MelindaGatesFoundationPeople
So DBPedia is returning URI's containing an ampersand. This is causing
an exception in the Jena parser.
How do I fix this? None of Jenas methods will work, I cant transofrm
the resultset into a model or even print is with the resultformatter.
If i iterate over it, I can print the results one by one till I get to
the malformed URI. How do I check in my code for malformed URI's?
Any ideas?
Thanks!
Marv
-------------
The code below works till i get a URI with an ampersand.
The exception is coming from results.nextSolution(). Other Jena
methods to convert the retrieved resultset to a model directly or
format it produce the same exception (I assume they have a similar
iterator inside)
QueryExecution qexec =
QueryExecutionFactory.sparqlService("http://DBpedia.org/sparql";,
"select distinct ?Concept where {[] a ?Concept}");
try {
ResultSet results = qexec.execSelect();
for ( ; results.hasNext() ; )
{
QuerySolution soln = results.nextSolution() ;
String x = soln.get("Concept").toString();
System.out.print(x +"\n");
}
}
finally {
System.out.println("closing!");
qexec.close() ;
}
This will result in the following error:
[com.ctc.wstx.exc.WstxLazyException]
com.ctc.wstx.exc.WstxUnexpectedCharException: Unexpected character '<'
(code 60); expected a semi-colon after the reference for entity
'MelindaGatesFoundationPeople'
at [row,col {unknown-source}]: [2609,96]
at
com.ctc.wstx.exc.WstxLazyException.throwLazily(WstxLazyException.java:45)
at
com.ctc.wstx.sr.StreamScanner.throwLazyError(StreamScanner.java:671)
at
com.ctc.wstx.sr.BasicStreamReader.safeFinishToken(BasicStreamReader.java:3505)
at
com.ctc.wstx.sr.BasicStreamReader.getText(BasicStreamReader.java:804)
at
com.ctc.wstx.sr.BasicStreamReader.getElementText(BasicStreamReader.java:674)
at
com.hp.hpl.jena.sparql.resultset.XMLInputStAX$ResultSetStAX.getOneSolution(XMLIn\
putStAX.java:472)
at
com.hp.hpl.jena.sparql.resultset.XMLInputStAX$ResultSetStAX.hasNext(XMLInputStAX\
.java:213)
I also posted this on the Jena group but some seem to suggest it is a dbpedia
issue: http://tech.groups.yahoo.com/group/jena-dev/message/36210
-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/
_______________________________________________
Dbpedia-discussion mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion
