Petra Brosch Philip Langer Martina Seidl Konrad Wieland Manuel Wimmer Gerti Kappel Werner Retschitzegger Wieland Schwinger An Example Is Worth a Thousand Words: Composite Operation Modeling By-Example. 271-285 2009 MoDELS http://dx.doi.org/10.1007/978-3-642-04425-0_20 conf/models/2009 db/conf/models/models2009.html#BroschLSWWKRS09