短消息服务接口的描述如图4所示。
The short message service interface is described as shown in Figure 4.
你会发现，随着你SOA系统的成长和变更，你会需要针对所有契约制品的版本管理策略：服务接口、消息和数据的模式、策略等。
You will find that as your SOA systems grow and change, you will need to have versioning polices for all contract artifacts: service interfaces, messages and data schemas, policies, etc.
也就是说，应用程序可以不完全单独遵从来自服务接口定义的消息实例。
In other words, an application cannot completely defer to a message instance from the service interface definition alone.
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