[Zope] Hidden field with a list type

[Paul Chung Chee Soong]

Hi Zopians. My problem is how can I make a hidden field to be a list with   
a default value? For instance, I try to make the following.

REQUEST.form['pno'] contains ['abc', 'def', 'ghi']

<snip>
<input type=hidden name="pno:list" value="<!--#var   
"REQUEST.form['pno']"-->">

When I submit the above page, and try to refer to pno, it doesn't produce   
the result I want. For example:

<snip>
<!--#in "REQUEST.form['pno']"-->
   <!--#var sequence-item--><BR>
<!--#/in-->

produces only 1 item, "['abc', 'def', 'ghi']" and not 3 items,
abc
def
ghi


Thanks for any comments,

 --Paul