use nextSibling();

here an example from the docs:

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.  
  12.  QDomElement docElem = doc.documentElement();
  13.  
  14.  QDomNode n = docElem.firstChild();
  15.  while(!n.isNull()) {
  16.      QDomElement e = n.toElement(); 
  17.      if(!e.isNull()) {
  18.          cout << qPrintable(e.text()) << endl; 
  19.      }
  20.      n = n.nextSibling();
  21.  }
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