How to use the azure-servicebus.azure.servicebus._common_conversion._lower function in azure-servicebus

def _queue_to_xml(writer, queue):
        writer.elements([
            ('LockDuration', queue.lock_duration, None),
            ('MaxSizeInMegabytes', queue.max_size_in_megabytes, None),
            ('RequiresDuplicateDetection', queue.requires_duplicate_detection, _lower),
            ('RequiresSession', queue.requires_session, _lower),
            ('DefaultMessageTimeToLive', queue.default_message_time_to_live, None),
            ('DeadLetteringOnMessageExpiration', queue.dead_lettering_on_message_expiration, _lower),
            ('DuplicateDetectionHistoryTimeWindow', queue.duplicate_detection_history_time_window, None),
            ('MaxDeliveryCount', queue.max_delivery_count, None),
            ('EnableBatchedOperations', queue.enable_batched_operations, _lower),
            ('SizeInBytes', queue.size_in_bytes, None),
            ('MessageCount', queue.message_count, None),
            ])