[Zope] <dtml-in REQUEST>

I remember I saw somewhere about it. but I couldn't search it out again. Can anyone tell me the correct way to do things like following? <dtml-in REQUEST> <dtlm-var "key">:<dtml-var "value"> </dtml> I want to check the indivial item inside the REQUEST one time at a time. but if I do <dtml-in REQUEST> I think it is not actually a list so that it is usable by dtml-in tag Kwan