[TurboGears] widget - dynamically contruct template string on __init__

[Ksenia Marasanova]

Hey,

I am trying to construct template property of a widget based on widget
parameters, in __init__ method:

class MyWidget(Widget):
    def __init__(self, *args, **kwargs):
        # just use textarea template for testing
        kwargs['template'] = """
        <div xmlns:py="http://purl.org/kid/ns#"; py:strip="True">
        <textarea name="${widget.name}" id="${widget.name}"
class="textarea_field"
py:attrs="widget.attrs">${widget_value}</textarea>
       <span class="field_error"
py:if="widget_error">${str(widget_error)}</span>
        </div>"""
       super(MyWidget, self).__init__(*args, **kwargs)

But it doesn't work, here is the end of the traceback that looks relevant:
  File "[...]/turbogears/widgets/base.py", line 129, in insert
    self.template)
  File "[...]/turbogears/view.py", line 61, in transform
    engine, template = _choose_engine(template)
  File "[...]/turbogears/view.py", line 32, in _choose_engine
    raise KeyError, \
KeyError: 'Template engine <div xmlns is not installed'

Any hints?

thanks
--
Ksenia