在本例中，xml_fallback函数替换一个基本的xml片段，以保持文件格式良好。

In this case, the xml_fallback function substitutes a basic XML snippet to keep the file well-formed.

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两个版本均在各节点应用一个函数来返回替换的节点(或原始节点)。

Both versions take a function to apply at each node that returns a replacement node (or the original node).

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这类函数可以替换内容、清空内容、从 DOM 移除所有元素、克隆元素等等。

There are functions for replacing content, emptying content, removing elements from the DOM altogether, cloning elements, and more.

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