Put Abstractions in Code, Details in Metadata.
将抽象放进代码，细节放进元数据。
Several interesting things happen when you can factor out these details from the application in a consumable metadata form
当您能够以可使用的元数据形式从应用程序中分析出这些细节时，将会发生若干有趣的事情
In order to provide this function, the message broker requires details specifying metadata for each message that will be received, parsed and validated.
为了提供此功能，Message Broker要求使用详细信息来指定将接收、分析和验证的每个消息的元数据。
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