job:  #9178  Updated implementation note to give clear definitions of abstract and concrete polymorphic events.
job:  #9178  Updated implementation note to give clear definitions of abstract and concrete polymorphic events.

lwriemen/mc,keithbrown/mc,leviathan747/mc,lwriemen/mc,keithbrown/mc,xtuml/mc,cortlandstarrett/mc,rmulvey/mc,keithbrown/mc,lwriemen/mc,rmulvey/mc,leviathan747/mc,leviathan747/mc,rmulvey/mc,cortlandstarrett/mc,cortlandstarrett/mc,rmulvey/mc,keithbrown/mc,xtuml/mc,cortlandstarrett/mc,lwriemen/mc,keithbrown/mc,leviathan747/mc,xtuml/mc,leviathan747/mc,lwriemen/mc,lwriemen/mc,leviathan747/mc,xtuml/mc,rmulvey/mc,xtuml/mc,cortlandstarrett/mc,keithbrown/mc,cortlandstarrett/mc,rmulvey/mc,xtuml/mc