清单1所示的输入消息提供一个数据值some_data，它与一个序号连接起来生成每个输出元素。

The input message, shown in Listing 1, provides a data value some_data that is concatenated with an ordinal number to produce each output element.

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Message - ID：这是在消息发送前被指派的序号。

Message-ID: This is the sequence number assigned to a message before sending.

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这一字段包含了确认消息所回应的日志消息的序号(Message - ID)。

This field contains the logging message's sequence number (Message-ID) that this acknowledgement message is acknowledging.

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