Index[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [R] [S] [T] [U] [V] [W] readOnly property of attributes realization relationship receive signals 2nd recurring time events, Activity diagram ref fragment 2nd region fragment region of states <<include>> relationships <<extend>> relationships relative time indicators required interfaces of classes of components return messages return type of operation reusability reuse <<include>> relationships for components for generalization for |