QDom insistent with other QT array

QDomElement root = document.firstChildElement (); 
QDomNodeList sections = root.elementsByTagName (XML_NODE_ROOT); 
QDomNodeList nodes; 

nodes = root.elementsByTagName (XML_NODE_PARAMETERS); 
for (int i=0; i<nodes.length (); i++) 
{ 
  const QDomNode node = nodes.at (i); 
  for (int a=0; a<node.attributes ().length (); a++) 
  { 
    QDomNode attr = node.attributes ().item (a); 
    qDebug () << attr.nodeName () << " " << attr.nodeType (); 
  } 
}

		nodes = root.elementsByTagName (XML_NODE_PARAMETERS);
		for (auto node : nodes)
		{
			for (auto attr : node.attributes ())
			{
				qDebug () << attr.nodeName () << " " << attr.nodeType ();
			}
		}