from twisted.web.template import Element, renderer, XMLFile from twisted.python.filepath import FilePath class ExampleElement(Element): loader = XMLFile(FilePath('slots-attributes-1.xml')) @renderer def person_profile(self, request, tag): # Note how convenient it is to pass these attributes in! tag.fillSlots(person_name='Luke', profile_image_url='http://example.com/user.png') return tag