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<html>
  <head>
    <title nevow:data="group_name" nevow:render="upper_string">HELLO </title>
  </head>
  <body>
    <p>Welcome to 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')
    def data_group_name (self, context, data):
	return "Chipy"
    def render_upper_string (self, context, data):
        return context.tag[data.upper()]
yields 

<html><head><title>HELLO CHIPY</title></head>
<body><p>Welcome to the wonderful world of Nevow, <span>Chipy</span>!</p>
</body></html>