如何在UML系统序列图中显示If else条件
问题描述：
是否可以在系统序列图中描述if-else结构？如果是，这是如何完成的？
Is it possible to describe an if-else structure in a system sequence diagram? If yes, how is this done?
答
以下是有关VS 2010序列图文档中组合片段的更多信息：
Here's more info about combined fragments from the VS 2010 sequence diagram documentation:
- UML Sequence Diagrams: Reference
- UML Sequence Diagrams: Guidelines
- Describing Control Flow with Fragments in UML Sequence Diagrams