@abc.abstractmethod<EOL><INDENT>def get_objectives_by_objective_bank(self, objective_bank_id):<DEDENT>
return<EOL>
Gets the list of ``Objectives`` associated with an ``ObjectiveBank``.

        :param objective_bank_id: ``Id`` of the ``ObjectiveBank``
        :type objective_bank_id: ``osid.id.Id``
        :return: list of related objective ``Ids``
        :rtype: ``osid.learning.ObjectiveList``
        :raise: ``NotFound`` -- ``objective_bank_id`` is not found
        :raise: ``NullArgument`` -- ``objective_bank_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*