code: def match_ancestor_objective_id(self, objective_id=None, match=None):
          
          if match:
              self._add_match('ancestorObjectiveId', objective_id)
          else:
              raise errors.Unimplemented()
docs: Sets the objective ``Id`` for this query to match objectives that have the specified objective as an ancestor.
  
          arg:    objective_id (osid.id.Id): an objective ``Id``
          arg:    match (boolean): ``true`` for a positive match,
                  ``false`` for a negative match
          raise:  NullArgument - ``objective_id`` is ``null``
          *compliance: mandatory -- This method must be implemented.*