if "attribute" is true do this "operation" else do nothing.
How do i show this in uml class diagram.
Thank you, kim
You don't. Class diagrams does not show behavior, but only structure. To show behavior you can use sequence diagrams, and a condition in sequence diagram is shown be be a rectangle which in its top corner you write the condition and inside it you describe the operation that occurs if condition is true. You can read here for more information: http://en.wikipedia.org/wiki/Sequence_diagram
It seems that this user would like to add business rules with condition in the class diagram. this option is not graphically possible with UML but could be added manually in the metamodel.
It is better to use the sequence diagram and frames. I found an example
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