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。
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。
The drawback of this approach is that multiple items in the item set need to be read or written for a single operation.
此方法的缺陷是对于单个操作需要读取或写入项目集中的多个项目。
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