@abc.abstractmethod<EOL><INDENT>def get_dependent_objectives(self, objective_id):<DEDENT>
return<EOL>
Gets a list of ``Objectives`` that require the given ``Objective``.

        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.

        :param objective_id: ``Id`` of the ``Objective``
        :type objective_id: ``osid.id.Id``
        :return: the returned ``Objective`` list
        :rtype: ``osid.learning.ObjectiveList``
        :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.*