@abc.abstractmethod<EOL><INDENT>def is_objective_required(self, objective_id, required_objective_id):<DEDENT>
return<EOL>
Tests if an objective is required before proceeding with an objective.

        One objective may indirectly depend on another objective by way
        of one or more other objectives.

        :param objective_id: ``Id`` of the dependent ``Objective``
        :type objective_id: ``osid.id.Id``
        :param required_objective_id: ``Id`` of the required ``Objective``
        :type required_objective_id: ``osid.id.Id``
        :return: ``true`` if ``objective_id`` depends on ``required_objective_id,``  ``false`` otherwise
        :rtype: ``boolean``
        :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.*