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<html>
  <head>
    <title>Patterns</title>
  </head>
  <body>
    <p>
<span nevow:render="message">
  <span nevow:pattern="greeting">Welcome to </span>
  <span nevow:pattern="staying">I hope you are still enjoying </span>
</span>
the wonderful world of Nevow,
       <span nevow:data="group_name" nevow:render="string" />!</p>
  </body>
</html>

class Page(rend.Page):
    docFactory = loaders.htmlfile('hellohtml.html')
    ctr = 0
    def data_group_name (self, context, data):
	return "Chipy"
    def render_message(self, context, data):
	if self.ctr == 0: msg = "greeting"
	else:        msg = "staying"
	self.ctr += 1
	return context.onePattern(msg)