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9/23: 细诉发布(Publish)与订阅(Subscribe)模式
接收端口发布XML消息到消息数据库。
订阅就像一个过滤器，编排为了完成它的流程，通常会要求一个描述的特定消息类型。一旦订阅成功，编排或发送端口就会从消息数据库中接收消息。
