| [SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z] key element 2nd 3rd keyref element 2nd keys and references in schemas Korean characters national standard character set for UTF-8/UTF-16 encodings 2nd |