new_contents: #coding: utf-8
  
  from formalchemy2.renderers import Renderer
  
  
  class Dummy(Renderer):
      """A dummy Renderer class."""
  
      group = u'dummy'
      name = u'dummy'
  
      def render(self, field):
          return u"%s (%s): %s\n" % (field.label, field.id, field.value)
  
subject: create a dummy renderer