JIS X 0212


JIS X 0212

JIS X 0212 is a Japanese Industrial Standard defining coded character set for encoding the characters used in Japanese. This standard extends JIS X 0208.

History

In 1990 the [http://www.jsa.or.jp/ Japanese Standards Association] (JSA) released a supplementary character set standard: JIS X 0212-1990 情報交換用漢字符号―補助漢字 (Code of the Supplementary Japanese Graphic Character Set for Information Interchange). This standard was intended to supplement and extend the range of characters available in the main JIS X 0208 character set, and to address shortcomings in the coverage of that set.

Features

The standard specified 6,067 characters, comprising:
* 21 Greek characters with diacritics
* 26 Eastern European characters with diacritics (mostly Cyrillic)
* 198 alphabetic characters with diacritics
* 5,801 kanji

Encodings

The following encodings or encapsulations are used to enable JIS X 0212 characters to be used in files, etc.
* in EUC-JP characters are represented by three bytes, the first being 0x8F, the following two in the range 0xA1 – 0xFE.
* in ISO 2022 the sequence "ESC $ ( D" is used to indicate JIS X 0212 characters.No encapsulation of JIS X 0212 characters in the popular Shift JIS encoding is possible, as Shift JIS does not have sufficient unallocated code space the characters.

Implementations

As JIS X 0212 characters cannot be encoded in Shift JIS, the coding system which has traditionally dominated Japanese information processing, few practical implementations of the character set have taken place. As mentioned above, it can be encoded in EUC-JP, which is commonly used in Unix/Linux systems, and it is here that most implementations have occurred:
* in the early 1990s basic "BDF" fonts were compiled for use in the Unix X Window System;
* an IME conversion file was compiled for the WNN system;
* the [http://ja.wikipedia.org/wiki/Kterm kterm] console window application was extended to support it;
* the Emacs and "jstevie" editors were extended to support it.Many WWW browsers such as the Netscape/Mozilla/Firefox family, Opera, etc. and related applications such as Mozilla_Thunderbird support the display of JIS X 0212 characters in EUC-JP encoding, however Internet Explorer has no support for JIS X 0212 characters.

Applications which support JIS X 0212 in the EUC coding include:
* the [http://www.csse.monash.edu.au/~jwb/xjdic/ xjdic] dictionary program for Unix/Linux;
* the WWWJDIC Japanese dictionary server (however as Internet Explorer does not support the JIS X 0212 extensions in EUC, this server sends bit-mapped graphics for these characters when set in EUC-JP mode.)

JIS X 0212 and Unicode

The kanji in JIS X 0212 were taken as one of the sources for the Han unification which led to the unified set of CJK characters in the initial ISO 10646/Unicode standard. All the 5,801 kanji were incorporated.

The Future

Apart from the applications mentioned above, the JIS X 0212 standard is effectively dead. 2,743 kanji from it were included in the later JIS X 0213 standard. In the longer term, its contribution will probably be seen to be the 5,801 kanji which were incorporated in Unicode.

References

* JIS X 0212-1990 情報交換用漢字符号―補助漢字, 日本規格協会, 東京 (1990年10月1日制定)."(the Japanese standards document)"
* Understanding Japanese Information Processing, Ken Lunde, O'Reilly & Assoc. 1993
* CJKV nformation Processing, Ken Lunde, O'Reilly & Assoc. 1999.

See also

*JIS X 0208
*JIS X 0213

Links

* [http://ja.wikipedia.org/wiki/JIS_X_0212 JIS X 0212 article on the Japanese Wikipedia]
* [http://www.csse.monash.edu.au/~jwb/kanjd212_doc.html KANJD212] database documentation


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