[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [R] [S] [T] [U] [V] [W] [X] object controls, HTML forms object datatype, XPath observer attribute, <listener> element omit-xml-declaration attribute, <submission> element operators, XPath optional form controls 2nd or operator, in computed expression Orbeon OXF processor order of precedence, XPath operators out-of-range form controls output form control |