[Zope] ZPT and attributes

[Antonio Beamud Montero]

Hi all:
How I can create attribute names dynamically?
For example, I want something like this:
<books ref1="http://boo" ref2="http://foo" ...>

Where ref1 and ref2, are created by the url list.
I have done in DTML because I cannot with ZPT.

Thanks...