[Pyparsing] better focused observation ... Re: need help building parsing framework for disability access tool

[Eric S.. J. <es...@es...>]

focusing on one line line 43 in the example...

line:
[hidden [id active_user][name active_user] [value [reveal active_user]]]

log:
Match argword at loc 962(43,2)
Matched argword -> ['hidden']
Match keyword at loc 970(43,10)
Matched keyword -> ['id']
Match arg at loc 973(43,13)
Exception raised:Expected "[" (at char 973), (line:43, col:13)
Match keyword at loc 986(43,26)
Matched keyword -> ['name']
Match arg at loc 991(43,31)
Exception raised:Expected "[" (at char 991), (line:43, col:31)
Match keyword at loc 1005(43,45)
Matched keyword -> ['value']
Match arg at loc 1011(43,51)
Match argword at loc 1012(43,52)
Matched argword -> ['reveal']
Matched arg -> [['reveal', ['active_user']]]
Match arg at loc 1031(43,71)
Exception raised:Expected "[" (at char 1031), (line:43, col:71)
Matched arg -> [['hidden', [['id', [], ['active_user']], ['name', [], ['active_user']], ['value', [['reveal', ['active_user']]], []]]]]
Match arg at loc 1033(43,1)

Exception map:
[hidden [id active_user][name active_user] [value [reveal active_user]]]
            *                 *                                       *

* marks where an exception was thrown

what should I be looking at?  My problem does not seem to be covered in the mini-ebook I bought (yes, I bought, not bootlegged).