@utilities.arguments_not_none<EOL><INDENT>def sequence_objectives(self, parent_objective_id, objective_ids):<DEDENT>
raise errors.Unimplemented()<EOL>
Sequences a set of objectives under a parent.

        arg:    parent_objective_id (osid.id.Id): the ``Id`` of the
                parent objective
        arg:    objective_ids (osid.id.Id[]): the ``Id`` of the
                objectives
        raise:  NotFound - ``parent_id`` or an ``objective_id`` not
                found, or an ``objective_id`` is not a child of
                ``parent_objective_id``
        raise:  NullArgument - ``paren_objectivet_id`` or
                ``objective_ids`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        *compliance: mandatory -- This method must be implemented.*