[Zope] processing forms

I have a form with 50 or less items on it. The names of the form variables are taken from the result of a database query. In the examples I've seen, the target document already knows the names of the variables, which in some examples are properties of the parent folder. How would a document process a form when it doesn't know the names of the variables. Is there a list of the variable names that the target document knows, and can iterate over? ------- Regards, Graham Chiu gchiu<at>compkarori.co.nz