def _append_message(self, message):
        self._file.seek(0, 2)
        self._pre_message_hook(self._file)
        offsets = self._install_message(message)
        self._post_message_hook(self._file)
        self._file.flush()
        return offsets
Attach an model definition to the JSON representation.
dataset/ETHPy150Open babble/babble/include/jython/Lib/mailbox.py/_singlefileMailbox._append_message--crossover with--dataset/ETHPy150Open turbulenz/turbulenz_tools/turbulenz_tools/tools/asset2json.py/JsonAsset.attach_model_definition