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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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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Then the paper derives a performance evaluation model, based on a Queueing Network Model, from a software architecture specification formally described in Chemical Abstract Machine.

基于队列网络模型，由化学抽象机中形式化描述的软件体系结构规约，导出了一种性能评价模型。

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