[Zope] use combined propertysheet variables to form a file name for a zObject

I made a propertysheet for a customed zclass and I wish to use some variables and combine them to form a name for my newed created object. Say I have variable a = 'name a' b = 'value b' c = 'string c' what do I encode in my dtml method some_add <dtml-with "NewsClass.createInObjectManager(REQUEST['??????'], REQUEST)"> ?????? into the combination of a, b, and c ? --------------------------------- Start your day with Yahoo! - make it your home page