I have the following code, but it doesn't seem to work. First of all, 'fragment' seems to be empty with debugger despite I call createDocumentFragment().
Below part for parsing XML document inside 'data' is to ensure that the source has data. All iterated item has.
Why fragment is empty? Thanks!

Qt Code: 
  1. if (mergedXML.documentElement().isNull())
  2.     {
  3.         QDomElement root = mergedXML.createElement("MergedMeasurements");
  4.         mergedXML.appendChild(root);
  5.     }
  6.  
  7.     foreach (XMLStruct data, mainXMLList)
  8.     {
  9.         QDomDocumentFragment fragment = data.getXMLDocument()->createDocumentFragment();  // This creates the fragment from QDomDocument.
  10.         mergedXML.firstChild().appendChild(fragment);
  11.         for (int i=0; i<data.getXMLDocument()->childNodes().count(); i++)
  12.         {
  13.             if (data.getXMLDocument()->childNodes().at(i).nodeName()=="OMeS")
  14.                 for (int j=0; j<data.getXMLDocument()->childNodes().at(i).childNodes().count(); j++)
  15.                 {
  16.                 if (data.getXMLDocument()->childNodes().at(i).childNodes().at(j).nodeName()=="PMSetup")
  17.                 {
  18.                     for (int k=0; k<data.getXMLDocument()->childNodes().at(i).childNodes().at(j).childNodes().count(); k++)
  19.                     {
  20.                         if (data.getXMLDocument()->childNodes().at(i).childNodes().at(j).childNodes().at(k).nodeName()=="extraInfoSetup")
  21.                         {
  22.                             QDomNode x = data.getXMLDocument()->childNodes().at(i).childNodes().at(j).childNodes().at(k);
  23.                             log(x.firstChildElement("measurementName").text());
  24.                         }
  25.                     }
  26.                 }
  27.             }
  28.         }
  29.  
  30.     }
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