----------------------------------------------------- node (key=1) type NodeInum (102) node (key=3) type NodeFnum (3.13159) node (key=4) type unknown type=NodeUnk node (key=5) type NodeStr (abc) node (key=6) type NodeInum (12) node (key=7) type NodeInum (666) node (key=8) type NodeStr (xyz) node (key=9) type NodeFnum (2.71828) ----------------------------------------------------- (9) --------- 2.71828 (8) ------------ xyz (7) ------ 666 (6) --- 12 (5) --------- abc (4) ------------ unknow (3) ------ 3.13159 (1) --------- 102 -----------------------------------------------------