How to select a specific XML node with XPath

Question

Hi,
I'm trying to a select a specific node from my XML data using the XPath Builder.  For example, say I have a process variable 'xmlData' with the
following contents:
    User 1
    101
    User 2
    102
I can successfully use the following expression to retrieve the name of
a specific user:
(/process_data/xmlData/users/user[userid='102'])/name
The problem is I need to use another process variable for the selection
key.  For Example:
(/process_data/xmlData/users/user[userid=/process_data/@userId])/name
But this always returns null.  I've tried surrounding /process_data/@userId
with single quotes, double quotes, and event {$..$}. 
Any help would be greatly appreciated.
Thanks.

Answer 1

Hi,
Thanks for the quick replies.  I gave a bit of a bad example, as the
userid in my data is really a string, not a number.
A better example is:
    User 1
    user1
    User 2
    user2
I can get the following to work perfectly:
(/process_data/xmlData/users/user[userid='user2'])/name
but I can't get it to work with
/process_data/@userId = "user2"
(/process_data/xmlData/users/user[userid=/process_data/@userId])/name
Thanks.