The document-node test without any parameter selects document nodes.
无参数的document - node测试可选择文档节点。
Comment type node test (' comment ') and PI type node test (' processing-instruction ').
评论类型节点测试(‘comment’)和PI类型节点测试(‘processing -instruction ’)。
In each axis step of a path expression, the node test comes between the axis and any predicates that might be present for arbitrary filtering.
在路径表达式的每个轴步骤中，节点测试出现在轴和谓词(用于进行任意筛选)之间。
In each axis step of a path expression, the node test comes between the axis and any predicates that might be present for arbitrary filtering.
在路径表达式的每个轴步骤中，节点测试出现在轴和谓词(用于进行任意筛选)之间。
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