def write(self, backup_info):
    fn = self._write_backup_info(backup_info)
    return [fn] + self._write_kind_info(backup_info)
e.g. {% if product|quantity_ordered:plata.order > 0 %} ... {% endif %}
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/datastore_admin/backup_handler.py/BackupInfoWriter.write--crossover with--dataset/ETHPy150Open matthiask/plata/plata/shop/templatetags/plata_tags.py/quantity_ordered