The service interface layer, described by a service contract, which specifies the service behavior and the messages required as the basis for interaction.
服务接口层，由一个服务契约进行描述，它指定了要求作为交互基础的服务行为和消息。
The elemental services, used by the service choreography layer and also by user interface applications, are implemented by service applications.
基本服务(由服务编排层使用，也由用户界面应用程序使用)通过服务应用程序实现。
The service layer object will be treated as a stateless interface to which the CRUD operations can be delegated.
服务层对象将作为无状态的接口对待，CRUD操作可以委托给该接口。
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