@abc.abstractmethod<EOL><INDENT>def sequence_nodes(self, parent_id, ids):<DEDENT>
pass<EOL>
Sequences a set of nodes under a parent.

        :param parent_id: the ``Id`` of the parent node
        :type parent_id: ``osid.id.Id``
        :param ids: the ``Id`` of the nodes
        :type ids: ``osid.id.Id[]``
        :raise: ``NotFound`` -- ``parent_id`` or an ``id`` not found, or an ``id`` is not a child of ``parent_id``
        :raise: ``NullArgument`` -- ``parent_id`` or ``ids`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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