parameters: (cls)
docstring: Get outer Message definition that contains this definition.
  
      Returns:
        Containing Message definition if definition is contained within one,
        else None.
docstring_summary: Get outer Message definition that contains this definition.
docstring_tokens: Get outer Message definition that contains this definition .
function: def message_definition(cls):
      """Get outer Message definition that contains this definition.
  
      Returns:
        Containing Message definition if definition is contained within one,
        else None.
      """
      try:
        return cls._message_definition()
      except AttributeError:
        return None
function_tokens: def message_definition ( cls ) : try : return cls . _message_definition ( ) except AttributeError : return None