@abc.abstractmethod<EOL><INDENT>def register_for_changed_location_hierarchy_for_ancestors(self, location_id):<DEDENT>
pass<EOL>
Registers for notification of an updated location hierarchy structure.

        ``LocationReceiver.changedChildOfLocations()`` is invoked when
        the specified node or any of its ancestors experiences a change
        in its children.

        :param location_id: the ``Id`` of the ``Location`` node to monitor
        :type location_id: ``osid.id.Id``
        :raise: ``NullArgument`` -- ``location_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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