Suppose you want to reuse the example above and add another operation that updates the product inventory, decreasing the product quantity for each item in the purchase order.
假设您想重用上面的例子，并加上一个更新产品库存，即减去购物订单中每项产品的产品数量的操作。
2
That indicates the type of operation applied to the item associated with the EPC.
这表示应用于与 EPC 相关联的物品的操作类型。
3
The drawback of this approach is that multiple items in the item set need to be read or written for a single operation.