[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] language architecture, four-layer metamodeling architecture  language aspect, UML  language exstensibility  languages     alphabet and      grammar and      paradigm      semantics      sentences      words  lifecycles, state and  lifelines      sequence diagrams  line paths     relationships and  link ends      aggregation      composition      interfaces      multiplicity          of 1          of more than 1      navigation      qualifiers      rolenames      types  link objects      OCL  links  2nd      association roles      binary links      collaboration diagrams      link ends         aggregation          composition          interfaces          multiplicity          navigation          qualifiers          rolenames          types      n-ary links      object diagrams  local data component instances  localization  LogMessage action, state diagrams