[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] [Z] UCS (Universal Character System) Unicode browser support converting ASCII to specifying unicode-bidi property uniform resource identifiers. [See URIs] uniform resource locators. [See URLs] union element unique element Universal Character System (UCS) unparsed entities embedding multiple unparsed entities 2nd external unparsed entities 2nd 3rd 4th unqualified locals schemas 2nd 3rd URIs (uniform resource identifiers) base, setting versus URLs URLs (uniform resource locators) specifying for external DTDs 2nd versus URIs use attribute values |