XmlSchema Validation does not terminate

Hello,
there appears to be some problem with the XmlSchema (or XmlSchemaValidator) class. If I load a valid XSD file with the XmlSchema class, the algorithm won't terminate. The code is the following:

int main(int argc, char **argv)
if (argc < 2)
return 1;

QApplication *app = new QApplication(argc, argv);

QFile file (argv[1]);
if (!file.open(QIODevice::ReadOnly))
return 1;

QXmlSchema schema;
schema.load (&file);

return !schema.isValid();

The program never reaches the end of the main procedure. Using gdb, I found that the application is somewhere stuck in between the validation:

(gdb) bt
#0 0x0000000000c8e0f8 in QPatternist::XsdStateMachine<QExplicitlySharedDataPointer<QPatternist::XsdTerm> >::epsilonClosure ()
#1 0x0000000000c8f754 in QPatternist::XsdStateMachine<QExplicitlySharedDataPointer<QPatternist::XsdTerm> >::toDFA ()
#2 0x0000000000c86f13 in QPatternist::XsdParticleChecker::isUPAConform ()
#3 0x0000000000ac7816 in QPatternist::XsdSchemaChecker::checkComplexTypeConstraints ()
#4 0x0000000000ace809 in QPatternist::XsdSchemaChecker::check ()
#5 0x0000000000a97d00 in QXmlSchemaPrivate::load ()
#6 0x0000000000a95396 in QXmlSchema::load ()
#7 0x000000000044ac20 in main (argc=2, argv=0x7fff31356bc8)

The input XSD was the following: http://www.absint.com/dtd/a3-apx-9.08i.xsd

Is there anything I am missing?