code: def _add_remover(self):
          
          def _remove_child(obj):
              obj.remove_all(self._nsptagname)
          _remove_child.__doc__ = (
              'Remove all ``<%s>`` child elements.'
          ) % self._nsptagname
          self._add_to_class(self._remove_method_name, _remove_child)
docs: Add a ``_remove_x()`` method to the element class for this child
          element.