The design follows the Open Closed Principle if you can extend the system by swapping out implementations of IDataSource without making any change to the BusinessProcess class.

如果你可以通过实现IDataSource对这个系统进行扩展并且不对BusinessProcess类做任何的修改，那么这个设计就遵循了开闭原则。

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On the basis of the structure model, it designs a special mark-up language and develops the related class-making system in order to prove it.

基于这个结构模型，设计了一套课程专用标记语言并开发了用于论证它的课程制作系统；

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Getting the system requirement model by using use case model in UML, and making further system analysis by using class diagram and package diagram in UML.

以uml中的用例模型得出了系统的需求模型；以uml中的类图和包图对系统作进一步的分析。

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Interestingly, even as Thatcher was working to open things up and making the British class system more like America's, the US class system started becoming more and more rigid.

BBC: Class calculator: A US view of the class system

Business has less riding on this case than it did before 2005, when Congress passed the Class Action Fairness Act making it much easier to pull class actions out of state court into the federal system.

FORBES: Class-Action Foes Have Trifecta Before Supreme Court

And while it no longer faces a federal investigation into Wi-Spy, the class action lawsuit consolidated in California is still making its slow way through the court system.

FORBES: Move up http://i.forbesimg.com t Move down