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。

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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。

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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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On previous iOS releases, when your app performed a coordinated read operation on a file or package and the iCloud daemon noticed that there was a newer version of the item available, the coordinated read operation blocked until the newer version of the item was downloaded and written to the disk.

ENGADGET: Apple seeds iOS 6 beta 4 to developers: here's the changelog