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http://bugs.kde.org/show_bug.cgi?id=59670     




------- Additional Comments From kalle@kde.org  2003-06-12 08:01 -------
There are many different subtypes, but here are some pointers I found: 
 
http://www.smartdraw.com/resources/centers/software/erd.htm 
http://kogs-www.informatik.uni-hamburg.de/~haarslev/publications/avitvl96/node3.html 
http://www.cit.cornell.edu/atc/materials/old/dbdesign/erd.pdf