In addition to providing a visual border, the frame element also has an important functional use in diagrams depicting interactions, such as the sequencediagram.
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。
2
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.