[Zope] dynamically generate dtml-tree urlparam attribute?

[jason]

hi,

i was wondering if anyone has either hacked the dtml-tree code or
written a python script to create a <dtml-tree> tag with a dynamically
generated urlparam attribute?  i currently have a <dtml-if/elif/else>
that selects from 7 prewritten <dtml-tree> tags, but i was hoping there
was a better/slightly more elegant way of doing this.

-jason yee