请帮助我理解这个 XPath [英] Please help me on understanding this XPath

问题描述

我在我的一个学习代码中遇到了这个 XPath:

I came across this XPath in one of my studying code:

  count($recprv//*[local-name()='provider_email' or local-name()='provider_fax' 
  or local-name()='provider_phone' or local-name()='provider_phone_ext' ])

我现在很难弄清楚它的意思，我个人认为它说:在 xml 文件 recprv 中，计算包含 provider_email 或包含 provider_fax 或包含 provider_phone 或包含 provider_phone_ext 的任何元素的数量.

I am now having a hard time figuring out what it means, I personally think it says:" in the xml file recprv, count the number of any elements that contain either provider_email or contains provider_fax or contains provider_phone or contains provider_phone_ext.

所以它基本上会遍历xml文件recprc并统计所有记录?只是有点糊涂.此外，我很想知道在 count 函数中究竟计算了什么.非常感谢你在这里帮助我！

So it will basically go through the xml file recprc and count all of the records? Just a bit confused. Moreover, I would love to know what is EXACTLY being counted in the count function. Thanks a lot for helping me out here!

推荐答案

 count($recprv//*
            [local-name()='provider_email'
           or 
            local-name()='provider_fax'  
          or 
            local-name()='provider_phone' 
          or 
            local-name()='provider_phone_ext' 
            ]
       ) 

这意味着:

给我变量中包含的任何树中包含的所有元素的计数 $recprv, whose local-name()(部分命名空间前缀后面的名称(如果存在，否则为全名)是provider_email、provider_fax、provider_phone 或 provider_phone_ext .

变量 $recprv 应该包含一个或多个元素(节点集)，并且每个这样的元素都是基于父 --> 子关系的树的顶部.

The variable $recprv should contain one or more elements (node-set) and every such element is the top of a tree based on the parent --> children relation.

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