If you want to change the content type or mime type for your Google App Engine template:
self.response.headers['Content-Type'] = "application/xml"
Full example:
class MainPage(webapp.RequestHandler):
def get(self):
greetings_query = databasemodel.all()
template_values = {
'greetings': greetings_query
}
self.response.headers['Content-Type'] = "application/xml"
path = os.path.join(os.path.dirname(__file__), 'templates/index.xml')
self.response.out.write(template.render(path, template_values))
