使用SDO服务提供商接口实现DAS。

Implementing a DAS using SDO service provider interface.

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服务接口定义了用户参与者的目标、需要以及期望，以及提供商参与者的价值预期、功能与承诺。

Service interfaces define the goals, needs, and expectations of user participants, as well as the value propositions, capabilities, and commitments of provider participants.

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这就是说，一个服务接口通过特定的联系点，定义了消费者与提供商之间可能发生的交互。

That is, a service interface defines the possible interactions of consumers and providers through specific interaction points.

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