[Zope] Sorting a list

I have a list: mylist=[('R',31),('I',80),('A',80),('S',23),('E',35),('C',21)] I want to rebuild the list sorted from high to low on the sequence-item. When i call <dtml-in mylist sort=sequence-item reverse> the list gets sorted on the sequence-key not the sequence-item. As I understand the alphabetical characters are the sequence-keys and the float values are the sequence-items. Where do misunderstand? Roché