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https://github.com/cjkvi/cjkvi-ids

IDS data for CJK Unified Ideographs
https://github.com/cjkvi/cjkvi-ids

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IDS data for CJK Unified Ideographs

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README 

        
IDS data

========



This is a collection of various IDS (Ideographic Description Sequence)

data.



## Description



IDS (Ideographic Description Sequence) is a way to describe the

structure of CJK Unified ideographs.



The IDS consists of IDCs (Ideographic Description Characters), namely

"⿰" (U+2FF0) to "⿻" (U+2FFB), and DCs (Description Characters), that

are usually ideographs.



IDS is quite important information for ideographs, as it may be

possible to identify ideographs from them.



However, there may be ambiguity for encoding IDS. Therefore, tools to

normalize IDS and identify the ideographs would be important.

[IDS tool](http://github.com/kawabata/ids) is one of such example.



Also, IDS sequences use full range of CJK ideographs, so the fonts

that covers all encoded ideographs (such

as [HanaMin](http://fonts.jp/hanazono/)

or [Hanamin AFDKO](https://github.com/cjkvi/HanaMinAFDKO/releases) )

should be used.



## Encoding Policies



* Compatibility ideographs, whose IDSes are not equal to their

  corresponding unified ideographs, may be used as DCs. When there are

  multiple compatibility ideographs with the same IDS, then the one

  with smaller character code will be used. (e.g.

  ⻀,並,荒,冗,叟,切,巢,廾,戛,桒,甾,𤾡,舁,蕤,貫,黾)



* Following non-ideographs may be used as DCs (for now).

  "αℓ△⺀⺄⺆⺈⺊⺌⺍⺶⺸⺻⺼〇〢キサ㇀㇉㇢㇞"



* Encircled numerics ① ～ ⑳ represents unencoded DCs. Number denotes

  its stroke count. This would be useful when calculating total

  strokes of ideographs. Such convention does not conform with the

  Annex I of ISO/IEC 10646, so please replace them with wildcard

  character `？' (U+FF1F) if you need a strict conformance with the

  UCS standard.



* IDS data file with name postfix "*-cdp.txt" adopts PUA characters

  from [CDP](https://www.sinica.edu.tw/~cdp) (CDP stands for "Chinese

  Document Processing lab" at Academia Sinica) as DCs. They are

  deonted as entity reference like "&CDP-xxxx;".



  At the end of "ids-cdp.txt", mappings between PUA DCs and CDP

  references are enumerated. For details of usable PUA characters,

  refer

  [an article on CDP](http://glyphwiki.org/wiki/Group:CDP%E5%A4%96%E5%AD%97) at

  GlyphWiki. CDP's hexadecmail numbers and Unicode BMP PUA character

  codepoints relationship is based on EUDC codepoints defined by by

  Microsoft

  [Big5 to PUA conversion table](http://kanji-database.sourceforge.net/charcode/big5.html).

  HanaMinAFDKO Font supports these glyphs in PUA.



* IDS of compatibility ideographs may sometimes have compatibility

  ideographs as DCs, by mean of clarifying the difference of their

  structures compared with corresponding unified ideographs.



* "G", "T", "J", "K", "V", etc. signs with brackets after IDS indicate

  that such IDS is specific to each columns of UCS code charts. "A"

  indicates AJ1-6 shapes, and "X" indicates virtual shape that is not

  actually appeared in the UCS specification, but possibly matches to

  that code points according to the Annex S of UCS. Some of such

  shapes may appear in OS-equipped fonts such as MingLiu, MS-Mincho or

  SimSun, or famous dictionaries such as "Dai Kanwa Jiten". "O"

  indicates "obsolete", that was once appeared in older edition of the

  UCS standard, but no longer.



## Licenses



* 'ids.txt' is derived from [CHISE project](http://www.chise.org/).

  License follows their terms. 'ids-ext-cde.txt' is not directly based

  on [CHISE project](http://www.chise.org/), and is not restricted to

  GPLv2 license.



* All other data are distributed uner GPLv2.



## Author



* [kawabata](https://github.com/kawabata)