code: def docSetRootElement(self, doc):
          
          if doc is None: doc__o = None
          else: doc__o = doc._o
          ret = libxml2mod.xmlDocSetRootElement(doc__o, self._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 ...).