QXmlSchemaValidator validate hanging

Using the example in the documentation of the QXmlSchemaValidator Class, I am attempting to validate a simple xml document against a very simple schema (See attached files).
Once calling the validate() method on the validator, my application hangs for a while before exiting out :mad:.

Is this an issue with Qt's validation, or am I doing something obviously stupid in my schema that I have missed.

Code:

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QFile schemaFile("schema.xsd");
schemaFile.open(QIODevice::ReadOnly);
 
QXmlSchema schema;
schema.load(&file, QUrl::fromLocalFile(schemaFile.fileName()));
 
if (schema.isValid()) {
    QFile file("document.xml");
    file.open(QIODevice::ReadOnly);
 
    QXmlSchemaValidator validator(schema);
    if (validator.validate(&file, QUrl::fromLocalFile(file.fileName())))
        qDebug() << "instance document is valid";
    else
        qDebug() << "instance document is invalid";
}

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