GB18030

GB18030 is the registered internet name for the official character set of the People's Republic of China (PRC). This character set is formally called "Chinese National Standard GB 18030-2000: Information Technology -- Chinese ideograms coded character set for information interchange -- Extension for the basic set". GB abbreviates guobiao (国家标准), which means ''national standard'' in Chinese. The standard was published by the China Standard Press, Beijing, March 17, 2000 and updated November 20, 2000. As of September 1, 2001, support for this character set is mandatory for all computer operating systems sold in the PRC. GB18030 can be considered a Chinese equivalent of UTF-8. Like UTF-8 it is a superset of ASCII and can represent the whole range of Unicode code points. However, unlike Unicode, GB18030 also maintains compatibility with GB2312/GBK which was the preexisting standard character encoding used in the PRC. Part of the mapping data is from a lookup table (similar to GBK). The rest is calculated algorithmically. Most major western computer companies had already standardised on some variant of Unicode as the primary format for use in their binary formats and OS calls. However they mostly had only bothered to support code points in the Basic Multilingual Plane. In a move of historical significance the People's Republic of China decided to mandate support of certain code points outside the BMP. This means that operating systems can no longer get away with treating characters as 16 bit fixed width entities (UCS-2). Therefore they must either process the data in a variable width format (such as UTF-8 or UTF-16) or move to a larger fixed width format (such as UCS-4 or UTF-32). Microsoft made the change from UCS-2 to UTF-16 with Windows 2000. The SimSun 18030 font enables the display of the GB 18030 characters, which includes all the characters in Unicode 2.1 plus new characters found in the Unicode CJK Unified Ideographs Extension A section. == See also == *Guobiao code *CJK *Chinese character encoding == References == *[http://www.iana.org/assignments/charset-reg/GB18030 IANA Charset Registration for GB18030] *[http://examples.oreilly.com/cjkvinfo/pdf/GB18030_Summary.pdf English language summary of GB 18030-2000] *[http://dev.icu-project.org/cgi-bin/viewcvs.cgi/*checkout*/charset/data/xml/gb-18030-2000.xml Authoritative mapping table between GB18030 and Unicode] *[http://www.ibm.com/software/globalization/icu/demo/converters?conv=gb18030 ICU Converter Explorer: GB18030] *[http://www.unicode.org/charts/PDF/U3400.pdf Unicode CJK Unified Ideographs Extension A] (PDF, 1.5MB) *[http://www.unicode.org/charts/PDF/U20000.pdf Unicode CJK Unified Ideographs Extension B] (PDF, 13 MB) Computing Character sets == External links == * [http://www.microsoft.com/downloads/details.aspx?FamilyID=fc02e2e3-14bb-46c1-afee-3732d6249647&DisplayLang=en GB18030 Support Package for Windows 2000/XP, including Chinese, Tibetan, Yi, Mongolian and Thai font by Microsoft] Guobiao standards

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GB18030