def to_xml(self, _entity_class=datastore.Entity):
    entity = self._populate_entity(_entity_class)
    return entity.ToXml()
Called before writing each message to file f.
dataset/ETHPy150Open CollabQ/CollabQ/.google_appengine/google/appengine/ext/db/__init__.py/Model.to_xml--crossover with--dataset/ETHPy150Open babble/babble/include/jython/Lib/mailbox.py/MMDF._pre_message_hook