Development History
Due to the inherent differences between standard written Chinese and written Cantonese, the Hong Kong Government recognized the need for a standardized set of proprietary characters that would allow for the streamlining of electronic communication; at the time, the Big5 Chinese encoding scheme did not contain a vast majority of these characters (some were erroneously cross-listed with similar characters).
The Government Chinese Character Set (政府通用字庫) or GCCS was thus developed by the government. The character set consists of Chinese characters commonly used in Hong Kong. Some characters are Cantonese-specific, while some are alternative forms of characters. The set is not well-organised and the characters are not closely examined.
Subsequently, the HKSCS-1999 (HKSCS 1999 specification) was developed. Following its acceptance, newer revisions were released in 2001 (adding 116 new characters) and in 2004 (adding 123 new characters), totalling 4,941 characters.
The HKSCS is encoded in Big5 and ISO 10646. Starting from HKSCS-2004, all characters using to Private Use Area section of Unicode are remapped, with many of them reassigned to Extension B Block or Supplementary Ideographic Plane Compatibility Block. However, to preserve compatibility with programs that generated PUA code points, the allocated code points are reserved, and no new characters will be mapped to PUA.
Read more about this topic: HKSCS
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