typedef TextAbstraction::CharacterIndex CharacterIndex; ///< An index into an array of characters
typedef TextAbstraction::Length Length; ///< The length of an array
typedef TextAbstraction::BidiInfoIndex BidiInfoIndex; ///< Index to the bidirectional info for a paragraph.
+typedef TextAbstraction::Script Script; ///< The character's script.
typedef uint32_t GlyphIndex; ///< An index into an array of glyphs