docs: def get_all_requisite_objectives(self, objective_id=None):
          """Gets a list of Objectives that are the requisites for the given
          Objective including the requistes of the requisites, and so on.
  
          In plenary mode, the returned list contains all of the immediate
          requisites, or an error results if an Objective is not found or
          inaccessible. Otherwise, inaccessible Objectives may be omitted
          from the list and may present the elements in any order
          including returning a unique set.
  
          arg:    objective_id (osid.id.Id): Id of the Objective
          return: (osid.learning.ObjectiveList) - the returned Objective
                  list
          raise:  NotFound - objective_id not found
          raise:  NullArgument - objective_id is null
          raise:  OperationFailed - unable to complete request
          raise:  PermissionDenied - authorization failure
          compliance: mandatory - This method must be implemented.
  
          """
          # This should be re-implemented if and when handcar supports
          # getting all requisites directly
          requisites = list()
          requisite_ids = list()
          all_requisites = self._get_requisites_recursively(objective_id, requisites, requisite_ids)
          return objects.ObjectiveList(all_requisites)