Works for me:
Qt Code: 
  1. #include <QtGui>
  2. #include <QtXml>
  3.  
  4. int main(int argc, char *argv[])
  5. {
  6.     QApplication app(argc, argv);
  7.     QString fileName = QFileDialog::getSaveFileName(0, "Save File", "", "XML Files ( *.xml)");
  8.     if (!fileName.isNull())
  9.     {
  10.         QFile file(fileName);
  11.         if (file.open(QIODevice::WriteOnly | QIODevice::Text))
  12.         {
  13.             QXmlStreamWriter xmlWriter(&file);
  14.             xmlWriter.writeStartDocument();
  15.             xmlWriter.writeDTD("<!DOCTYPE xbel>");
  16.             xmlWriter.writeStartElement("xbel");
  17.             xmlWriter.writeAttribute("version", "1.0");
  18.             xmlWriter.writeTextElement("Uri", "name", "This is Text");
  19.             xmlWriter.writeEndDocument();
  20.         }
  21.     }
  22.     return 0;
  23. }
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