QUESTION:
i am not able to discover how to use the alt/combined fragment correctly in starUML,as in there is no way that i am able to provide the condition after the alt fragment appears.can any1 just list down the procedure as to how to do it or a link to some good tutorial.
ANSWER:
Add an Interaction Operand to a Combined Fragment. When you select the Interaction Operand you should see in the Properties Inspector a 'Guard' field. You can type your condition just there.
转自：http://stackoverflow.com/questions/16152278/using-alt-in-sequence-diagrams-for-staruml