uhhh, from the comments (I read the doc with comments OFF), seems like the arg may be a dispatcher object... ok, YES, it solved the problem ! sorry for the inconvenience...
In the doc example, addForm is really defined with no argument, and I still don't see what knid of arg that ought to be. I'm still investigating. Grepping around current existing products doesn't help much since no installed product shows this very pattern (of an addForm function defined as in the zope doc).
Thanks for your patience,
Aurélien.
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