I went on an interview last year and was shown a sequence diagram and was asked to describe the the sequence. There were 2 things in the diagram I had never seen before. I asked what one of them was and was told that's how an if statement is shown in a sequence diagram. The other was an arrow going back to the actor that originated the arrow, I assumed that was a loop.
- Is there a standard way to show a conditional sequence?
- How often is a conditional sequence used in UML sequence diagrams?