1 # 2 # purchaseOrder 3 # 4 t 0 1 shipTo 5 t 1 2 billTo 6 t 2 3 comment 7 t 3 4 items 8 e 2 3 9 f 4 10 ------- 11 shipTo 12 billTo 13 comment 14 items 15 => 16 shipTo 17 billTo 18 items 19 => 20