With that knowledge, you will be able to create a service design model that includes Messages, service Specifications, and Services.

有了这些知识，您就可以创建一个包含消息、服务规格说明以及服务的服务设计模型。

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This leads to a "black-box" usage model, where a service may utilize other services without the client's knowledge, thereby propagating changes with secondary effects.

这导致“黑盒”使用模式，一个服务在不知道客户端知识的情况下利用其他服务，因而传播带有二次影响的变更。

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This article analyses the characteristic and model of knowledge service, discusses the necessity of knowledge service in digital library and expounds the ways to carry out knowledge service.

文章分析了知识服务的特点与运作模式，论述了数字图书馆知识服务的必然性及实现技术，在此基础上阐述了数字图书馆开展知识服务的对策。

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