Xpath element with common parent

Question

I am trying to find the 'comment' node where the 'name' node == 'package 3'. Previously I was using rpc-reply/blah/blah-blah/information/package-information[3] , but I'm looking for a more robust method which filters on the 'name' and returns the associated 'comment'.

I did some googleing and found the 'Kaysian method' might be what I was looking for, however I could not apply/understand it.

To phrase my question in another way, the below might clarify what I am after:

SELECT comment WHERE name = 'package 3' FROM rpc-reply//package-information

<rpc-reply>
<blah>
    <blah-blah>
        <information>
            <package-information>
                <name>package 1</name>
                <comment>44565545</comment>
            </package-information>
            <package-information>
                <name>package-2</name>
                <comment>6859887</comment>
            </package-information>
            <package-information>
                <name>package 3</name>
                <comment>5548845</comment>
            </package-information>
            <package-information>
                <name>package 4</name>
                <comment>548878</comment>
            </package-information>
        </information>
    </blah-blah>
</blah>
</rpc-reply>

Answer 1

选择名称为package 3的package-information元素，然后转到注释：

/rpc-reply/blah/blah-blah/information/package-information[name='package 3']/comment

Answer 2

另一个可能的解决方案：

 //name[contains(text(), 'package 3')]/following-sibling::comment