XPath子集选择

本文介绍了XPath子集选择的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有以下XML（实际上是HTML）：

I have the following XML (which is actually HTML):

<html>
    <h4>something</h4>
    <p>a</p>
    <p>b</p>
    <h4>otherthing</h4>
    <p>c</p>
</html>

XPath可以选择跟随第一个h4节点的兄弟节点的p节点，但不是继第二个h4节点的兄弟姐妹（仅选择p节点a和b）？

Can a XPath selects the "p" nodes that are following siblings of the first "h4" node but not following siblings of second "h4" node (selecting "p" node a & b only)?

推荐答案

/ p>

My take

//p[preceding-sibling::h4[1] and not(preceding-sibling::h4[position() > 1])]

查找所有p元素，它们是第一个h4的兄弟，但不是任何兄弟其他h4在同一轴上

finds all p elements which are siblings of the first h4 but not siblings of any other h4 on the same axis

另类

//h4[1]/following-sibling::p[count(preceding-sibling::h4) = 1]

找到第一个h4元素的所有后面的p元素，它们确实有一个前面的h4元素

finds all following p element of the first h4 element that do have exactly one preceding h4 element

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