下面的内容不属于 Core Spec，但也很重要。

Unicode Standard Annexes

UAX #9, The Unicode Bidirectional Algorithm

UAX #11, East Asian Width

UAX #14, Unicode Line Breaking Algorithm

UAX #15, Unicode Normalization Forms

UAX #24, Unicode Script Property

UAX #29, Unicode Text Segmentation

UAX #31, Unicode Identifier and Pattern Syntax

UAX #34, Unicode Named Character Sequences

UAX #38, Unicode Han Database (Unihan)

UAX #41, Common References for Unicode Standard Annexes

UAX #42, Unicode Character Database in XML

UAX #44, Unicode Character Database

UAX #45, U-Source Ideographs

UAX #50, Unicode Vertical Text Layout

Unicode Technical Standards and Reports

UTS #10, Unicode Collation Algorithm

UTS #39, Unicode Security Mechanism

UTS #46, Unicode IDNA Compatibility Processing

UTS #51, Unicode Emoji