docs: def _add_group_remover(self):
          """
          Add a ``_remove_eg_x()`` method to the element class for this choice
          group.
          """
          def _remove_choice_group(obj):
              for tagname in self._member_nsptagnames:
                  obj.remove_all(tagname)
  
          _remove_choice_group.__doc__ = (
              'Remove the current choice group child element if present.'
          )
          self._add_to_class(
              self._remove_choice_group_method_name, _remove_choice_group
          )