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http://bugs.kde.org/show_bug.cgi?id=151661         
           Summary: Would like to be able to model association classes
           Product: umbrello
           Version: unspecified
          Platform: Ubuntu Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
        AssignedTo: uml-devel lists sourceforge net
        ReportedBy: mgolden mitchgolden com


Version:            (using KDE KDE 3.5.8)
Installed from:    Ubuntu Packages

I quite frequently use association classes.  An association class "hangs off of" or modifies a relationship between two other classes.  In the diagram on the URL below, there is a many-to-many relationship between flights and frequentfliers.  When a frequentflier boards a flight, she can get some arbitrary mileagecredit (determined in some unspecified way).  The mileagecredit modifies the relationship between the frequentflier and the flight - it has no existence outside of that relationship.

In UML, such a class is shown as a dotted line off of the line connecting the two "main" associated classes.

http://www.ibm.com/developerworks/rational/library/content/RationalEdge/sep04/bell/bell_fig11.jpg

(This is similar to bug 121725.)  

P.S.  I really like Umbrello.  Intuitive and immediately useful.