[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] 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 elementspackages subsystems modeling techniques state modeling modelsabstractions behavior modeling definition structural modeling multiplicityassociation ends link ends qualifiers
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