[Zope] Accessing an object from a list

Hello, I ran into this problem once again: what is the best way to access an object whose ID is stored in a list? Here's my setup: I use a form with check boxes to select object IDs. The values for the selected boxes are send to the handler method in a list (myList). Here is the code in the handler method. <dtml-with REQUEST> ... <dtml-in myList> <dtml-let foo="_['sequence-item']"> <dtml-with "_.getitem(foo, 0)"> <dtml-var myProp1> - <dtml-var myProp2> </dtml-with> </dtml-let> </dtml-in> ... </dtml-with> I was lucky because this actually works. However, it looks kludgy. Is there a better way? For instance, can I use the 'mapping' attribute in the with tag? Thanks. Alexandre