将抽象放进代码，细节放进元数据-Put Abstractions in Code，Detail in MetaData 用服务进行设计-Design Using Services 总是为并发进行设计-Always Design for Concurrency ..
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用于用例建模的方法可以视为SOA设计的自顶向下方法，服务操作基于所需的场合进行标识。
The approach to use case modeling can be considered a top-down approach for SOA design, where service operations are identified based on where they are needed.
我们对服务提供者进行的设计，首先创建一个定义其需求的系统用例，以及一个被称作 Invoicer 的实现该用例的 组件。
We start the design of this service provider by creating a system use case that defines its requirements and a component called Invoicer that realizes the use case.
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