code: def render_flow(self, data):
          
  
          self.render_tree(data)
  
          # then reconstruct a new ODT document with the generated content
          for status in self.__save_output():
              yield status
docs: render the OpenDocument with the user data
  
          @param data: the input stream of user data. This should be a dictionary
          mapping, keys being the values accessible to your report.
          @type data: dictionary