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。
We can turn around, but don't look back, even if one day, you find you are wrong, you should also turn, a big step towards the right direction, not back to blame their own wrong.
我们可以转身，但是不必回头，即使有一天，你发现自己走错了，你也应该转身，大步朝着对的方向去，而不是回头怨自己错了。
We will learn from the things that went wrong and go one step further next year.
我们从错误中学到了很多，下赛季我们会走的更远。
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