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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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。

youdao