Manipulations like this (backed by the proper relational theory) are at the heart of database query optimizers. The resulting tree is shown in Figure 2.

此类操作(由恰当的关系理论作为支持)是数据库查询优化器的核心所在。

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The new filter API lets you examine and modify a document’s structure during parsing by asking a parser to accept, skip, or remove a node and its children from the resulting tree.

新的过滤器 API 使您可以在解析期间通过请求解析器接受、忽略一个节点及其子节点或者将它们从产生的树中删除，来检查和修改文档的结构。

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Those eggs are deposited in the tree's branches, but when they hatch (which they do two weeks after being laid), the resulting larvae fall to the ground and tunnel down to the tree's roots, from which they suck their sustenance.

ECONOMIST: The 17-year cicadas are about to emerge in force