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In activity diagrams, you can have a top level activity diagram that contains a sub-activity diagram. This is useful where the sub-activity contains lots of details that you don't want to show in the top level activity diagram.
Is a similar concept available for sequence diagrams?
Basically, I have a sequence diagram where I want to hide some of the details in the diagram by moving those details to another sequence diagram.
This can be achieved by using a
<<ref>>fragment in your sequence diagram, that references a sub sequence diagram.See for example this picture : http://www.ibm.com/developerworks/rational/library/content/RationalEdge/feb04/3101_figure11.jpg where Balance Lookup and Debit Account are references to other sequence diageams that may in turn contain plenty of lifelines and calls.
Ah, it looks like the solution may be to use an Interaction Overview Diagram.