Message correlation: Messaging middleware needs to provide a message correlation mechanism to correlate request and corresponding response messages.

消息相关：消息传递中间件需要提供消息相关机制来将请求与对应的响应消息相关。

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Target-Action: The mechanism that enables a view object to present a control in response to a user event; for example, a click to send the action message to the target object.

Target-Action：该机制支持视图对象呈现一个控制，响应一个用户事件；例如，单击发送活动消息到目标对象。

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