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M0-level layer (user model layer) M1-level layer (model layer) M2-level layer (metamodel layer) M3-level layer (meta-metamodel layer) messages clients 2nd collaborations interactions stimuli and suppliers 2nd meta-metamodel (M3-level layer) metamodel layer (M2-level layer) methodology methods 2nd information hiding polymorphism role identification model aspect of UML model elements model layer (M1-level layer) model management elements packages subsystems modeling techniques state modeling models abstractions behavior modeling definition structural modeling multiplicity association ends link ends qualifiers |