The services layer consists of all the services defined within the SOA where a service is just an abstract specification of one or more business-aligned IT functions (operations).
服务层由 SOA 中定义的所有服务构成，其中，服务仅仅是对一个或多个与业务一致的 IT 功能（操作）的抽象规范。
In this case, we use an abstract class to define the service specification, as shown in Figure 5.
在这种情况下，我们使用一个抽象类来定义服务规范，如图5所示。
The single, unified programming model and abstract XML description of all EJBs (local or remote) is at the heart of the EJB 2.0 specification.
所有 EJB（本地或者远程）的单一、统一的编程模型和抽象 XML 描述是 EJB 2.0 规范的核心。
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