code: def parse_at_root(
              self,
              root,  # type: ET.Element
              state  # type: _ProcessorState
      ):
          # type: (...) -> Any
          
          xml_value = self._processor.parse_at_root(root, state)
          return _hooks_apply_after_parse(self._hooks, state, xml_value)
docs: Parse the given element as the root of the document.