[Zope] Using lists in DTML

[Ken Kinder]

Say I have two iterations like this:

<ul>
  <dtml-in ..>
    <li>..
  </dtml-in>
  <dtml-in ..>
    <li>..
  </dtml-in>
</ul>

That use two different SQL queries, but return rows from the same
table. Logically, to the user, these iterations render just one
lists. How would I eliminate duplicates created by querying the
same table?

One thought is, but I'm not sure how to go about doing it, is to
store a list of keys already displayed. Something like this

(create a list named foo)
<ul>
  <dtml-in ..>
    <li>..
    (add id to list foo)
  </dtml-in>
  <dtml-in ..>
    (check to see if id is in list foo from last dtml-in)
    (if id is in list, skip)
  </dtml-in>
</ul>

Any ideas on what syntax I would use for that?

-- 
Ken Kinder
303.381.7631