[Zope] DTML parsing Python- tuples and lists

Hello: I wondering how/if DTML can parse Python sequence types: the list and tuple. The scenario: an external method returns a tuple full of stuff(lists and dictionaries), and I want to tear it down and format it using DTML fors and DTML ifs, but I don't see anyone talking about doing this. Any pointers would be appreciated. -andy diller