deferred class EV_TREE_NODE_LIST_I Ancestors EV_ITEM_LIST_I* [reference G -> EV_ITEM] Descendants EV_TREE_I* EV_TREE_ITEM_I* EV_TREE_NODE_I* Clients EV_TREE_NODE_LIST* EV_TREE_NODE_LIST_I* Suppliers ANY ARRAYED_LIST [G] BOOLEAN EV_ITEM_LIST* [reference G -> EV_ITEM] EV_TREE_NODE* EV_TREE_NODE_I* EV_TREE_NODE_LIST_I* PROCEDURE [BASE_TYPE, OPEN_ARGS -> TUPLE create default_create end]