The parser tree is an important concept of this part and of the whole browser program. There is a special part to introduce it.
“语法树”是这部分以及整个浏览器程序中的重要概念，本章中有专门小节对它进行介绍。
参考来源 - 嵌入式浏览器的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
The axpath() method returns what is known as an augmented parse tree -- a parser tree with one extra node for the END_MARK.
axpath() 方法返回称之为扩张的解析树 ― 该解析树额外地带有一个表示 END_MARK 的节点。
Note that the parser passes enough information to build the document tree of the XML documents but, unlike a DOM parser, it does not explicitly build the tree.
请注意，语法分析器传递了足够信息以构建XML文档的文档树，但是与dom语法分析器不同，它并不显式地构建该树。
In other words, this governs the shape and content of the parse tree that's constructed by the parser.
换句话说，该构造管理由解析器构造的解析树的形状和内容。
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