Try adding something like this in your render method (haven't tried
this, but from a poking around the code in the DocumentTemplate
directory in the past this seems about right):

import VSEval
expr = VSEval.Eval(variable_you_want_to_evaluate)
value = expr.eval(md)

-Randy

> -----Original Message-----
> From: Romain Slootmaekers [mailto:[EMAIL PROTECTED]]
> 
> I'm trying to create a custom dtml tag, and after the How-to on this
> (http://www.zope.org/Members/z113/1) that in itself posed no 
> problem: easy
> as pie. The problem I'm having with the tag is that parameters are not
> evaluated. for instance (my tag's name is 'aa')

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