Book Title Chapter Title Content. Character Range Char #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF] any Unicode character, excluding the surrogate blocks, FFFE, and FFFF. Standalone Document Declaration SDDecl S 'standalone' Eq (("'" ('yes' | 'no') "'") | ('"' ('yes' | 'no') '"')) element EmptyElemTag | STag content A bunch of anchors to make the preceding examples valid: Standalone Document Declaration Some description... Element Valid Some description... Element Type Match Some description...