Yo, 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') <dtml-let y="someValue"> <dmlt-aa role="y" ...> ....</dtml-aa> </dtml-let> gives me in the code: role=="y" while I want it to be "someValue", playing with the quotes doesn't help either. I think that, in the python code I need to do some extra call to some routine that do the evaluation/substitution... but I don't know which. Anyway, I uncluded a code thingy below, (basically the code from the How-to) Can anyone help me on this ? TIA, Sloot. ---------------------------- code thingy < 20 lines ----------------------- from DocumentTemplate.DT_Util import * from DocumentTemplate.DT_String import String TAGNAME = 'aa' class AATag: name = TAGNAME blockContinuations = () def __init__(self, blocks): tagname, args, section = blocks[0] args = parse_params(args, role="dont-know", property=None, id="no-id-given") self.args, self.section = args, section def render(self, md): # some code here... __call__ = render String.commands[TAGNAME] = AATag