data += "<a>";
#include <QXmlSimpleReader>
#include <QCoreApplication>
#include <QXmlInputSource>
#include <QDebug>
#include <QByteArray>
#include <QBuffer>

int main(int argc, char ** argv)
{
  QCoreApplication app(argc,argv);
  
  QByteArray data;
  QBuffer buffer(&data);
  buffer.open(QIODevice::ReadOnly);

  QXmlInputSource source(&buffer);
  
  // Any none empty string will do the job.
  data += "";

  QXmlSimpleReader reader;
  bool success = reader.parse(&source, true);
  if (!success) {
    qDebug() << "parsing failed!";
  }
  else {
    qDebug() << "parsing successful.";
  }
  buffer.close();

  return 0;
}