Index[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] XHTML (eXtensible HyperText Markup Language) defining document hierarchy 2nd 3rd element HTML development changed original purpose 2nd content non-standard compliant sites 2nd future presentation 2nd markup basics 2nd 3rd 4th 5th 6th 7th 8th rules 2nd 3rd 4th 5th 6th sample document standards-based coding, benefits XML CDATA tags namespaces, XHTML rules |