We start with a selector matching any message with a sequence number of 1, and once we have that message, we determine which group it is in.

首先，我们使用选择器来匹配任何序列号为 1 的消息，获得此消息后，我们将确定其所属的组。

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The RMS now adds a Sequence header into the original application message. This has the SequenceID and the message number (in this case it will be 1).

现在，RMS将在原始消息增加Sequence信息头，其中包括SequenceID和消息编号（在本例中是1）。

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At a minimum, it allows the destination to know the highest message number in the sequence so it can return a Fault if it receives any messages with a number greater than three.

至少，目的地可以用它来了解序列中的最大消息数量，因此如果它收到任何比3大的消息号时可能会返回错误。

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