Editing Extended Unix Code (section)

===GBK and GB 18030===
{{Main|GBK (character encoding)|GB 18030}}
[[GBK (character encoding)|GBK]] is an extension to {{nowrap|GB 2312}}. It defines an extended form of the EUC-CN encoding capable of representing a larger array of [[CJK characters]] sourced largely from {{nowrap|[[Unicode]] 1.1}}, including [[traditional Chinese characters]] and characters used only in [[Japanese language|Japanese]]. It is not, however, a true EUC code, because ASCII bytes may appear as trail bytes (and [[C0 and C1 control codes#C1|C1 bytes]], not limited to the single shifts, may appear as lead or trail bytes), due to a larger encoding space being required.

Variants of GBK are implemented by [[Code page 936 (Microsoft Windows)|Windows code page 936]] (the [[Microsoft Windows]] [[Windows code page|code page]] for simplified Chinese), and by IBM's code page 1386.

The Unicode-based {{nowrap|[[GB 18030]]}} character encoding defines an extension of GBK capable of encoding the entirety of [[Unicode]]. However, Unicode encoded as {{nowrap|GB 18030}} is a [[variable-width encoding|variable-length encoding]] which may use up to four bytes per character, due to an even larger encoding space being required. Being an extension of GBK, it is a superset of EUC-CN but is not itself a true EUC code. Being a Unicode encoding, its repertoire is identical to that of other [[Unicode transformation format]]s such as [[UTF-8]].