Architecturally, components interact via an abstract service model-a messaging model that resides at a level of abstraction above any particular protocol or message-encoding format.
架构上，组件通过一个抽象的服务模型(一个消息传递模型，位于任何特殊协议或消息编码之上的抽象层中)进行交互。
This transformation is from the abstract to the concrete and leads fairly directly to the final level, which describes the actual implementation of the model into a deliverable product or service.
这一转换是从抽象到具体，并相当直接地通向最终级别，其描述了从模型到一个可交付产品或服务的实际的实施。
Because this specification includes a behavioral protocol, we model it using an abstract class that defines the roles (properties) involved in the service protocol.
由于该规范包括行为协议，所以使用一个对服务协议中涉及到的角色(属性)进行定义的抽象类来进行建模。
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