code: def add_to_output(self, mtype, m_id, serialisable_dict):
          
          if mtype not in self.unordered_models:
              self.unordered_models[mtype] = OrderedDict()
          self.unordered_models[mtype][m_id] = serialisable_dict
docs: Can add additional objects or dictionaries to output file that don't conform to standard objects.
  
          :param mtype:
          :param m_id:
          :param serialisable_dict:
          :return: