@abc.abstractmethod<EOL><INDENT>def register_for_new_hierarchy_nodes(self):<DEDENT>
pass<EOL>
Register for notifications of new hierarchy nodes.

        ``HierarchyStructureReceiver.newNodes()`` is invoked when a new
        ``Hierarchy`` node is added.

        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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