def _init_map(self):
        """stub"""
        super(CalculationInteractionQuestionFormRecord, self)._init_map()
        QuestionTextFormRecord._init_map(self)
        QuestionFilesFormRecord._init_map(self)
        self.my_osid_object_form._my_map['text']['text'] = ''
        self.my_osid_object_form._my_map['variables'] = \
            self._variables_metadata['default_object_values'][0]
        self.my_osid_object_form._my_map['expression'] = \
            self._expression_metadata['default_string_values'][0]
stub