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.

youdao

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.

youdao

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.

youdao