与服务模型一样，服务规范产生实现这些服务的系统组件的逻辑描述。
Along with the service model, service Specification produces logical descriptions of the system components that realize services.
许多系统需要的类型比规范中定义的内置类型更多。
Many systems need more types than those defined as built-ins in the specification.
MDA 方法构建在较早期的系统规范标准的工作上，并且为定义相互连接的系统提供一种全面的具有互操作能力的框架。
The MDA approach builds on earlier system specification standards work, and it provides a comprehensive interoperability framework for defining interconnected systems.
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