Turtle parser fails on CONSTRUCT query result

Tue, 27 Jan 2015 02:59:04 -0800 

Hello,
when I run the SPARQL query on the DBpedia endpoint http://dbpedia.org/sparql 

CONSTRUCT {
<http://dbpedia.org/resource/Leipzig> ?p0 ?o0.
}
WHERE {
<http://dbpedia.org/resource/Leipzig> ?p0 ?o0.
}


by using the code


String query = "CONSTRUCT {\n" +
                "<http://dbpedia.org/resource/Trey_Parker> ?p0 ?o0.\n" +
                "?o0 ?p1 ?o1.\n" +
                "}\n" +
                "WHERE {\n" +
                "<http://dbpedia.org/resource/Trey_Parker> ?p0 ?o0.\n" +
                "OPTIONAL{\n" +
                "?o0 ?p1 ?o1.\n" +
                "}}";

com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP qe = new 
com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP("http://dbpedia.org/sparql";, 
query);

qe.setDefaultGraphURIs(Collections.singletonList("http://dbpedia.org";));
Model model = qe.execConstruct();
qe.close();


I get an exception thrown by the Turtle parser:


11:48:30,550 ErrorHandlerFactory$ErrorLogger - [line: 263, col: 45] Bad 
IRI: <http://th.dbpedia.org/resource/หมวดหมู่:ผู้กำกับภาพยนตร์ชาว อเมริกัน> 
Code: 47/NOT_NFKC in PATH: The IRI is not in Unicode Normal Form KC.
11:48:30,553 ErrorHandlerFactory$ErrorLogger - [line: 263, col: 45] Bad 
IRI: <http://th.dbpedia.org/resource/หมวดหมู่:ผู้กำกับภาพยนตร์ชาว อเมริกัน> 
Code: 56/COMPATIBILITY_CHARACTER in PATH: TODO
11:48:30,557 ErrorHandlerFactory$ErrorLogger - [line: 288, col: 45] Bad 
IRI: 
<http://zh_min_nan.dbpedia.org/resource/Category:Bí-kok_tiān-iáⁿ_tō-ián> 
Code: 47/NOT_NFKC in PATH: The IRI is not in Unicode Normal Form KC.
11:48:30,557 ErrorHandlerFactory$ErrorLogger - [line: 288, col: 45] Bad 
IRI: 
<http://zh_min_nan.dbpedia.org/resource/Category:Bí-kok_tiān-iáⁿ_tō-ián> 
Code: 56/COMPATIBILITY_CHARACTER in PATH: TODO
11:48:30,574 ErrorHandlerFactory$ErrorLogger - [line: 440, col: 13] Bad 
IRI: <http://th.dbpedia.org/resource/หมวดหมู่:ผู้อำนวยการสร้างรายการ โทรทัศน์ 
ชาวอเมริกัน> Code: 47/NOT_NFKC in PATH: The IRI is not in Unicode Normal 
Form KC.
11:48:30,575 ErrorHandlerFactory$ErrorLogger - [line: 440, col: 13] Bad 
IRI: <http://th.dbpedia.org/resource/หมวดหมู่:ผู้อำนวยการสร้างรายการ โทรทัศน์ 
ชาวอเมริกัน> Code: 56/COMPATIBILITY_CHARACTER in PATH: TODO
11:48:30,584 ErrorHandlerFactory$ErrorLogger - [line: 513, col: 24] 
Unknown char: «(171;0x00AB)
Exception in thread "main" org.apache.jena.riot.RiotException: [line: 
513, col: 24] Unknown char: «(171;0x00AB)
    at 
org.apache.jena.riot.system.ErrorHandlerFactory$ErrorHandlerStd.fatal(ErrorHandlerFactory.java:136)
    at 
org.apache.jena.riot.lang.LangEngine.raiseException(LangEngine.java:163)

    at org.apache.jena.riot.lang.LangEngine.nextToken(LangEngine.java:106)

    at 
org.apache.jena.riot.lang.LangTurtleBase.triplesNode(LangTurtleBase.java:368)
    at 
org.apache.jena.riot.lang.LangTurtleBase.objectList(LangTurtleBase.java:350)
    at 
org.apache.jena.riot.lang.LangTurtleBase.predicateObjectItem(LangTurtleBase.java:288)
    at 
org.apache.jena.riot.lang.LangTurtleBase.predicateObjectList(LangTurtleBase.java:281)
    at 
org.apache.jena.riot.lang.LangTurtleBase.triples(LangTurtleBase.java:250)
    at 
org.apache.jena.riot.lang.LangTurtleBase.triplesSameSubject(LangTurtleBase.java:191)
    at 
org.apache.jena.riot.lang.LangTurtle.oneTopLevelElement(LangTurtle.java:44)
    at 
org.apache.jena.riot.lang.LangTurtleBase.runParser(LangTurtleBase.java:90)

    at org.apache.jena.riot.lang.LangBase.parse(LangBase.java:42)

    at 
org.apache.jena.riot.RDFParserRegistry$ReaderRIOTLang.read(RDFParserRegistry.java:169)

    at org.apache.jena.riot.RDFDataMgr.process(RDFDataMgr.java:859)
    at org.apache.jena.riot.RDFDataMgr.read(RDFDataMgr.java:255)
    at org.apache.jena.riot.RDFDataMgr.read(RDFDataMgr.java:229)
    at org.apache.jena.riot.RDFDataMgr.read(RDFDataMgr.java:219)

    at 
com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execModel(QueryEngineHTTP.java:431)
    at 
com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execConstruct(QueryEngineHTTP.java:387)
    at 
com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execConstruct(QueryEngineHTTP.java:382)



When I force the QueryEngineHTTP to request RDFXML instead of TURTLE 
which is somehow the default setting it works without exception.


My questions are:


1. Is it a bug in Virtuoso and a wrong character is returned or is it 
some problem within the Turtle parser?
2. Is there a way to change the accept format from outside the 
QueryEngineHTTP class?
3. Is there a way to ignore such kind of triples such that I get some 
warning but the parser does not terminate with an error?


Thanks in advance.

Kind regards,
Lorenz

--
Lorenz Bühmann
AKSW group, University of Leipzig
Group: http://aksw.org - semantic web research center























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