Chinese Character Code for Information Interchange
The Chinese Character Code for Information Interchange (Chinese: 中文資訊交換碼) or CCCII is a character set developed specifically to address the problem of interchange of Chinese information. It is used mostly by libraries because the code contains various properties considered to be desirable by libraries. Its 94 ISO 2022 planes are grouped into 16 layers of 6 planes each. Layer 2 contains Simplified Chinese characters, with their row and cell numbers being the same as the Traditional Chinese equivalent in layer 1. Layers 3 through 12 contain further variant forms, at row and cell numbers homologous to the first two layers. Layer 13 contains kana and Japanese kokuji, and layer 14 contains hangul.[1]
CCCII is a superset of ASCII designed to conform to ISO 2022. Each Chinese character is represented by a 3-byte code in which each byte is 7-bit. Thus, the maximum number of Chinese characters representable in CCCII is 94×94×94 = 830584. In practice the number of characters encodable by CCCII would be less than this number, because variant characters are encoded in related ISO 2022 planes under CCCII, so most of the code points would have to be reserved for variants.
The code is adopted as the character set for Library of Congress with the name East Asia Coded Character (EACC, ANSI/NISO Z39.64). However, some CCCII characters don't have EACC equivalent.[2]
Code charts
CCCII character Set
EACC character set
Character set
Character set 0x21
Character set 0x212F
Character set 0x2130
Character set 0x2131
Character set 0x2132
References
- ^ Lunde, Ken (1995-12-18). "2.5.2: CCCII". CJK.INF Version 1.9.
- ^ "Archived copy". Archived from the original on 2016-06-15. Retrieved 2016-06-15.
{{cite web}}: CS1 maint: archived copy as title (link) - ^ a b c d e f "Character Set: East Asian Ideographs ('Han')". Library of Congress. Retrieved 16 February 2019.
- Some information on this page is based on the information on the CNS official website.
External links
- CNS 11643 official web site (English version of pages available) has information about the CCCII character set in the "Chinese Information Code" section
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