QDomElement destructor causes a crash when calling QDomNamedNodeMapPrivate::clearMap() in Qt 4.6

#include <QtCore/QCoreApplication> 
#include <QDomElement> 

class DataType 
{ 
public: 
	virtual ~DataType() {} 

	QDomElement Serialize() const 
	{ 
		QDomDocument xmld; 
		QDomElement xmle = xmld.createElement("DataType"); // ret val 

		// add some attributes... 
		xmle.setAttribute("Name","I'm Qt!"); 

		return xmle; 
	} 
}; 

class IntegerDataType : public DataType 
{ 
public: 
	QDomElement Serialize() const 
	{ 
		QDomElement xmle = DataType::Serialize(); 

		xmle.setAttribute("Value","10"); 

		return xmle; 
	} 
}; 

int main(int argc, char *argv[]) 
{ 
	QCoreApplication app(argc, argv); 

	IntegerDataType obj; 

	{ 
		QDomElement xmle = obj.Serialize(); 

		// Then append the domelement to a domdocument which will be saved to the disk etc etc... 
	} 

	return 0; 
}