code: def setRootElement(self, root):
          
          if root is None: root__o = None
          else: root__o = root._o
          ret = libxml2mod.xmlDocSetRootElement(self._o, root__o)
          if ret is None:return None
          __tmp = xmlNode(_obj=ret)
          return __tmp
docs: Set the root element of the document (doc->children is a
             list containing possibly comments, PIs, etc ...).