[Zope] presenting a list of stuff

hello, i'd like to know whats the most elegant/practical/usefull way of displying a list of stuff (that might or might not be there). i have a zclass with a couple of boolean properties and i'd like to display a list of *true* items this way : ItemA,ItemB,ItemD,ItemE. (itemC is false) i can do it pretty easily with a bunch of dtml-if (but it looks too ugly and my fingers hurt !) and i can't kill the "," before the last point. p.s. i would prefer to do it in dtml since this has a lot more to do with presentation than logic and since the guys who will be coming after me will be even less python-enabled than i am ;-) thx, $ven