deferred class EV_TREE_NODE_LIST Ancestors EV_ITEM_LIST* [reference G -> EV_ITEM] Descendants EV_TREE EV_TREE_NODE* Clients EV_TREE EV_TREE_NODE* EV_TREE_NODE_I* EV_TREE_NODE_LIST* Suppliers ARRAYED_LIST [G] BOOLEAN EV_TREE_NODE_LIST* EV_TREE_NODE_LIST_I*