Nothing is wrong with this code at all; it's just that instead of persisting XML, you really persist data and stuff it in XML, all in one step.
这段代码并没有任何错误；我们只是将数据持久化存储于XML 中，所有操作都在一步之内完成。
Nothing is wrong with me. What's wrong with you?
我没怎么，你怎么回事儿？
Nothing is wrong with me. What's wrong with you?
我没怎么，你怎么回事儿？
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