Render a mold `mold_id`.  No wrappers are applied as only the
        default template defined for the mold is rendered.

def render(self, mold_id, data):
        """
        Render a mold `mold_id`.  No wrappers are applied as only the
        default template defined for the mold is rendered.
        """

        template = self.load_mold(mold_id)
        return template.render(**data)