docs: def match_ancestor_bank_id(self, bank_id, match):
          """Sets the bank ``Id`` for to match banks in which the specified bank is an acestor.
  
          arg:    bank_id (osid.id.Id): a bank ``Id``
          arg:    match (boolean): ``true`` for a positive match,
                  ``false`` for a negative match
          raise:  NullArgument - ``bank_id`` is ``null``
          *compliance: mandatory -- This method must be implemented.*
  
          """
          # matches when the bank_id param is an ancestor of
          # any bank
          bank_descendants = self._get_descendant_catalog_ids(bank_id)
          identifiers = [ObjectId(i.identifier) for i in bank_descendants]
          self._query_terms['_id'] = {'$in': identifiers}