Note the generated attribute on the cart element, which is a timestamp produced by System.currentTimeMillis().

请注意 cart 元素的 generated 属性，它是 System.currentTimeMillis() 生成的一个时间戳。

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The generated attribute on the cart element, a timestamp created when the cart was serialized to XML, is checked to ensure that newer cart data is not overwritten by older cart data.

cart元素的generated属性是在cart序列化为XML时生成的一个时间戳，检查它可以保证新的购物车数据不会被旧的数据覆盖。

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