You should be familiar with the following XML-related, computer-science concepts: tree traversal, recursion, and reuse of data.
应该熟悉下列与 XML 有关的计算机科学概念：树遍历、递归和数据重用。
Any XML document is a well-defined tree of elements and attributes, and XML queries are expressed in terms of tree traversal.
每个XML文档均是定义良好的元素和属性树，并使用树遍历来表示XML查询。
We can use either of two methods on the java.nio.Files class to start the tree traversal.
我们可以利用两个方法中的任何一个在类上启动树遍历。
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