[Zope] How subclass calls its ancestor's method in zope?

Here is a ZClass testa, with a dtml method 'do'. Its subclass testb overrides do. How testb calls its ancestor's 'do'? In python, it can be done as 'testa.do()', but what's the equivallent in zope? Dirksen __________________________________________________ Do You Yahoo!? Yahoo! Photos - Share your holiday photos online! http://photos.yahoo.com/