XPath获取最大ID [英] XPath to get the maximum ID

问题描述

XML 源代码:

<schools>
    <school>
        <name>School A</name>
        <student>
            <name>Student A</name>
            <id>12345</id>
        </student>
        <student>
            <name>Student B</name>
            <id>45678</id>
        </student>
    </school>
    <school>
        <name>School C</name>
        <student>
            <name>Student C</name>
            <id>91178</id>
        </student>
        <student>
            <name>Student D</name>
            <id>99999</id>
        </student>
    </school>
</schools>

我仍然是 XPath 的初学者.我想获得总体 ID 最高的学生(示例中为 99999)，而不是来自每所学校.我无法更改我的 python 代码，即

I am still a beginner to XPath. I want to get the student with the overall highest ID (so 99999 in the example), not from each school. I can't change my python code which is

tree.xpath(" ... ")

我只能修改xpath.我试过 "//student[not(../student/id > id)] 但这给了我来自各自学校的最高 ID 学生.我想要的是整体最高 ID.应该如何我修改了我的 xpath?

I can only modify the xpath. I have tried "//student[not(../student/id > id)] but this gives me highest id students from respective schools. What I want is the overall highest ID. How should I modify my xpath?

如何从学校水平开始写作?我的意思是如果我想要最高ID"学生退出的学校名称怎么办?

Edited : How do I write starting from the school level? I mean what if I want the school name which "highest ID" student exits?

推荐答案

关于:

//student[not(../../school/student/id > id)]

或者，更简单:

//student[not(//student/id > id)]

要获得具有最高学生 ID 的 <school/> 元素，我相信这会起作用:

To get the <school/> element with the highest student ID, I believe this will work:

//school[student[not(//student/id > id)]]

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