In addition to providing a visual border, the frame element also has an important functional use in diagrams depicting interactions, such as the sequence diagram.
除了提供一个图形化边框之外，用于图中的框架元件也有描述交互的重要的功能，例如序列图。
And getting functional flowchart of system module by using status diagram and sequence diagram in UML for system design; Last, making a design of database and system interface.
又以uml中的状态图和时序图进行系统设计，给出了具体模块的功能流程图，对数据库做了相应的设计。
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