[Zpt] Still a depenency on PyXML.

[Todd Coram]

> Paul reported that ZPT still tries to import from xml.dom. As it turns out
> there is indeed an import in TALDefs.py, which isn't needed anymore now
> that TAL doesn't use any DOM.
>
> It would make life for the Rochester ppl much much easier if we can remove
> the old code ASAP, at least the bit that references xml.dom.Node.

Eh?
Rochester is using ZPT???  We are in the middle of a rewrite (the first
release was *just a prototype*). We had/have no plans to support the
prototyped code. Please do not develop sites against the current ZPT. The
way it operates is subject to change (and has changed).

The reliance on a DOM is gone. Right now, pyexpat is used to parse the input
as XML. We may drop that too....

-- todd