The QDom classes are typically used as follows:

Qt Code: 
  1. QDomDocument doc("mydocument");
  2.     QFile file("mydocument.xml");
  3.     if (!file.open(QIODevice::ReadOnly))
  4.         return;
  5.     if (!doc.setContent(&file)) {
  6.         file.close();
  7.         return;
  8.     }
  9.     file.close();
  10.  
  11.     // print out the element names of all elements that are direct children
  12.     // of the outermost element.
  13.     QDomElement docElem = doc.documentElement();
  14.  
  15.     QDomNode n = docElem.firstChild();
  16.     while(!n.isNull()) {
  17.         QDomElement e = n.toElement(); // try to convert the node to an element.
  18.         if(!e.isNull()) {
  19.             cout << e.tagName() << endl; // the node really is an element.
  20.         }
  21.         n = n.nextSibling();
  22.     }
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More information:
QDomDocument