UAX #15: Added an implementation note about using 255 as an implementation specific value for optimization of tables containing Canonical_Combining_Class values.
UAX #29: Updated the discussion of legacy grapheme clusters for Thai. Moved the section on Hangul syllable boundary determination to a new section in this UAX, from Chapter 3 of the Core Specification. Made other small editorial fixes.
UAX #31: Supplied the recommended usage for identifiers for new scripts encoded in Unicode 6.1. Clarified the status of lists of Other_ID_Start and Other_ID_Continue characters.