if you already have a way of printing XML, you can add a "printer" field (that is a python function) to your template, like so:http://github.com/plaitpy/plaitpy/blob/master/templates/test...

if that function uses an import, you might also need to add an "imports" field, like in this example: https://github.com/plaitpy/plaitpy/blob/master/templates/web...

otherwise, that's a feature that can be added here: https://github.com/plaitpy/plaitpy/blob/master/src/fields.py..., if it works for you (and is added as a flag), i'd be happy to take patches.