XML : C++ pugiXML, Append a child before the first child in a node

How do you append a new child to a node and place it prior to the first child? i.e. I want to try and append a new child and push it to the top in order.

Say, if I have:

  pugi::xml_node root;   pugi::xml_node level1 = root.append_child("Level1");  pugi::xml_node level2 = root.append_child("Level2");  pugi::xml_node level3 = root.append_child("Level3");    

Can I somehow append a new node, level4 and have it before the level1 node in the XML tree?