描述了工作流管理系统的开发中,归纳总结出来的一个用于处理模型与实例关系的设计模式——模型与实例,并通过该设计模式在工作流管理系统设计中的一个具体应用,介绍了如何使用模型与实例设计模式进行设计。
A software design pattern, model and instance, is described in this article. The model and instance design pattern is widely used in development of workflow management system to deal with the relation between model and instance. Then an application of model and instance design pattern in a workflow management system is introduced to show the usage of this design pattern.