[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [W] [X] I18N actions, descriptions 2nd definition Web application, example Web applications identifier accessing null effect of evaluation if array if bean if list if map for map key[identifier map key] null vs. nonexistent syntax implicit objects <IXCOUR accessing servlet/JSP properties cookie for scopes[implicit objects scopes] inadvertent name use initParam listing pageContext accessing servlets/JSP properties properties request properties param/paramValues types usefulness iteration actions 2nd collaboration custom action incrementing loop index over array of strings, example over attributes stored in scope over context initialization parameters, example over data structures example types of structures values of begin/step/end attributes over explicit integer values example specifying starting/ending values over strings over tokens over vector of strings, example requirements for scriptlet specifying taglib directive using status objects 2nd |