...
   <p>
      Hello <span nevow:data="data" nevow:render="string" />!
    </p>

static_page = static.Data ('Plain text', 'text/plain')

class Page(rend.Page):
    docFactory = loaders.htmlfile('hellohtml.html')
    def __init__ (self):
	self.data = ''
        super (Page, self).__init__ ()
    def child_static (self, context):
	return static_page
    def child_explicit (self, context):
        self.data = "explicit child"
	return self
    def getDynamicChild (self, segment, request):
	self.data += segment
	return self
    def data_data (self, context, data):
	return self.data