from twisted.web.template import Element, renderer, XMLFile, tags
from twisted.python.filepath import FilePath

class ExampleElement(Element):
    loader = XMLFile(FilePath('template-1.xml'))

    @renderer
    def header(self, request, tag):
        return tag(tags.b('Header.'))

    @renderer
    def footer(self, request, tag):
        return tag(tags.b('Footer.'))