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目前WEB应用的复杂性正日益增加。任何较复杂的系统都需要经过设计和建模，因此应该用基于模型的方法来开发WEB应用。文章介绍了一种用UML的扩展机制为WEB应用系统建模的方法，该方法在设计阶段使用，能用于各种WEB技术（如CGI、ASP和ISAPI等）。
The complexity of WEB application is increasing day by day. Any more complex system needs to be designed and modeled, so a web-based application should be developed using a model-based approach. This paper introduces a method of modeling the Web application system by UML extension mechanism, which is used in the design stage and can be used in various WEB technologies such as CGI, ASP and ISAPI.