Re: xsl:key (use attribute)

<xsl:key name="emp_id" match="/emp_enq_ap3/pay_proc_nos"
use="concat(@client_id, @emp_id)"/>

Is this a correct xsl statement?

This is the error I am getting:

Expected ,, but found:
pattern = 'key('emp_id', concat(@client_id, @emp_id)'
Remaining tokens: ( ')')

It seems there is a syntax error soemwhere around where
you use the key. Perhaps you are missing a closing quote
or something. Apparently, the parser expected a comma.
You could use another processor which gives you the number
of the line where the error occurs, like Saxon.
BTW I'd say it should be
 select='key('emp_id', concat(@client_id, @emp_id)'