@utilities.arguments_not_none<EOL><INDENT>def is_objective_required(self, objective_id, required_objective_id):<DEDENT>
raise errors.Unimplemented()<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.

        arg:    objective_id (osid.id.Id): ``Id`` of the dependent
                ``Objective``
        arg:    required_objective_id (osid.id.Id): ``Id`` of the
                required ``Objective``
        return: (boolean) - ``true`` if ``objective_id`` depends on
                ``required_objective_id,`` ``false`` otherwise
        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.*