Sequence Diagram mapping to Use case

[Parvesh Jain]

 
i am drawing sequence diagrams for each use case. One of the use case have extend relationship with other use case. This extend happend on some condition like Update record when not found. Can someone help me to find how to represent this relation in my sequence diagram.

Thanks
Parvsh Jain

[Evolution]

I see two posibilities:
1. Try a NOTE Link on the diagram specifying the condition (its been a discussion some time ago about this... try "search")

2. Try an Iteration box where you specify the condition
For both, specify the use case you're calling if the condition is true.

It's easy to find a correct UML syntax, its harder to find an easy to understand syntax. Try this: after you are done with the diagram, show it to your developer and ask him/her to read the diagram   If he/she can read the diagram the diagram is good. Otherwise you may want to review it

Good Luck!
Evolution Man.