[W3C Recommendation] is a language for describing transforms from an input XML document to an output tree.

是一种转换语言，描述从输入 XML 文档到输出树的转换。

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XPath provides the expression language necessary to locate and retrieve individual nodes or node collections from the HTML document tree.

XPath提供从HTML文档树定位和检索单个节点或节点集所需的表达式语言。

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The first is called generic, which is a generic tree representation that's formed from the language front-end trees.

第一种是GENERIC，它是一种通用的树表示法，由语言前端树构成。

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