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ISO 639 is a set of standards by the
International Organization for Standardization The International Organization for Standardization (ISO ) is an international standard development organization composed of representatives from the national standards organizations of member countries. Membership requirements are given in A ...
that is concerned with representation of names for
language Language is a structured system of communication. The structure of a language is its grammar and the free components are its vocabulary. Languages are the primary means by which humans communicate, and may be conveyed through a variety of ...
s and language groups. It was also the name of the original standard, approved in 1967 (as ''ISO 639/R'') and withdrawn in 2002. The ISO 639 set now consists of five parts, since part 6 was withdrawn.


Use of ISO 639 codes

The language codes defined in the several sections of ISO 639 are used for bibliographic purposes and, in computing and internet environments, as a key element of locale data. The codes also find use in various applications, such as Wikipedia URLs for its different language editions.


Current and historical parts of the standard

Each part of the standard is maintained by a maintenance agency, which adds codes and changes the status of codes when needed. ISO 639-6 was withdrawn in 2014.


Characteristics of individual codes

Scopes: * Individual languages * Macrolanguages (Part 3) * Collections of languages (Parts 1, 2, 5). Part 1 contains only one collection (bh), some collections were already in Part 2, and others were added only in Part 5: ** Remainder groups: 36 collections in both Part 2 and 5 are of this kind (including one that was also coded in Part 1) — for compatibility with Part 2 when Part 5 was still not published, the remainder groups do not contain any language and collection that was already coded in Part 2 (however new applications compatible with Part 5 may treat these groups inclusively, as long they respect the containment hierarchy published in Part 5 and they use the most specific collection when grouping languages); ** Regular groups: 29 collections in both Parts 2 and 5 are of this kind — for compatibility with Part 2, they can't contain other groups; ** Families: 50 new collections coded only in Part 5 (including one containing a regular group already coded in Part 2) — for compatibility with Part 2, they may contain other collections except remainder groups. *
Dialect The term dialect (from Latin , , from the Ancient Greek word , 'discourse', from , 'through' and , 'I speak') can refer to either of two distinctly different types of linguistic phenomena: One usage refers to a variety of a language that is ...
s: they were intended to be covered by Part 6 (proposed but now withdrawn). * Special situations (Parts 2, 3). * Reserved for local use (Parts 2, 3). Also used sometimes in applications needing an alpha-2 code like standard codes in Parts 1 and 2 (where the special code mis is not suitable), or an alpha-3 code for collections like standard codes in Part 5. Types (for individual languages): * Living languages (Parts 2, 3) (all macrolanguages are living languages) *
Extinct language An extinct language is a language that no longer has any speakers, especially if the language has no living descendants. In contrast, a dead language is one that is no longer the native language of any community, even if it is still in use, l ...
s (Parts 2, 3) (608, 5 of them are in Part 2: chb, chg, cop, lui, sam; none are in Part 1) * Ancient languages (Parts 1, 2, 3) (124, 19 of them are in Part 2; and 5 of them, namely ave, chu, lat, pli and san, also have a code in Part 1: ae, cu, la, pi, sa) * Historical languages (Parts 2, 3) (83, 16 of them are in Part 2; none are in Part 1) * Constructed languages (Parts 1, 2, 3) (23, 9 of them in Part 2: afh, epo, ido, ile, ina, jbo, tlh, vol, zbl; 5 of them in Part 1: eo, ia, ie, io, vo) Individual languages and macrolanguages with two distinct alpha-3 codes in Part 2: * Bibliographic (some of them were deprecated, none were defined in Part 3): these are legacy codes (based on language names in English). * Terminologic (also defined in Part 3): these are the preferred codes (based on native language names, romanized if needed). * All others (including collections of languages and special/reserved codes) only have a single alpha-3 code for both uses.


Relations between the parts

The different parts of ISO 639 are designed to work together, in such a way that no code means one thing in one part and something else in another. However, not all languages are in all parts, and there is a variety of different ways that specific languages and other elements are treated in the different parts. This depends, for example, whether a language is listed in Parts 1 or 2, whether it has separate B/T codes in Part 2, or is classified as a macrolanguage in Part 3, and so forth. These various treatments are detailed in the following chart. In each group of rows (one for each scope of ISO 639-3), the last four columns contain codes for a representative language that exemplifies a specific type of relation between the parts of ISO 639, the second column provides an explanation of the relationship, and the first column indicates the number of elements that have that type of relationship. For example, there are four elements that have a code in Part 1, have a B/T code, and are classified as macrolanguages in Part 3. One representative of these four elements is "Persian" fa/per/fas. These differences are due to the following factors. In
ISO 639-2 ISO 639- 2:1998, ''Codes for the representation of names of languages — Part 2: Alpha-3 code'', is the second part of the ISO 639 standard, which lists codes for the representation of the names of languages. The three-letter codes given for ea ...
, two distinct codes were assigned to 22 individual languages, namely a bibliographic and a terminology code (B/T codes). B codes were included for historical reasons because previous widely used bibliographic systems used language codes based on the English name for the language. In contrast, the ISO 639-1 codes were based on the native name for the language, and there was also a strong desire to have 639-2 codes (T codes) for these languages which were similar to the corresponding 2-character code in ISO 639-1. * For instance, the
German language German ( ) is a West Germanic language mainly spoken in Central Europe. It is the most widely spoken and official or co-official language in Germany, Austria, Switzerland, Liechtenstein, and the Italian province of South Tyrol. It is also a ...
(Part 1: de) has two codes in Part 2: ger (B code) and deu (T code), whereas there is only one code in Part 2, eng, for the
English language English is a West Germanic language of the Indo-European language family, with its earliest forms spoken by the inhabitants of early medieval England. It is named after the Angles, one of the ancient Germanic peoples that migrated to the ...
. * 2 former B codes were withdrawn, leaving today only 20 pairs of B/T codes. Individual languages in Part 2 always have a code in Part 3 (only the Part 2 terminology code is reused there) but may or may not have a code in Part 1, as illustrated by the following examples: * Part 3 eng corresponds to Part 2 eng and Part 1 en * Part 3 ast corresponds to Part 2 ast but lacks a code in Part 1. Some codes (62) in Part 3 are macrolanguages. These are groups containing multiple individual languages that have a good mutual understanding and are commonly mixed or confused. Some macrolanguages developed a default standard form on one of their individual languages (e.g. Mandarin is implied by default for the Chinese macrolanguage, other individual languages may be still distinguished if needed but the specific code cmn for Mandarin is rarely used). * 1 macrolanguage has a Part 2 code and a Part 1 code, while its member individual languages also have codes in Part 1 and Part 2: nor/no contains non/nn, nob/nb; or * 4 macrolanguages have two Part 2 codes (B/T) and a Part 1 code: per/fas/fa, may/msa/ms, alb/sqi/sq, and chi/zho/zh; * 28 macrolanguages have a Part 2 code but no Part 1 code; * 29 other macrolanguages only have codes in Part 3. Collective codes in Part 2 have a code in Part 5: e.g. aus in Parts 2 and 5, which stands for Australian languages. * One collective code in Part 2 also has a code in Part 1: bih/bh. * Some codes were added in Part 5 but had no code in Part 2: e.g. sqj Parts 2 and 3 also have a reserved range and four special codes: * Codes qaa through qtz are reserved for local use. * There are four special codes: mis for languages that have no code yet assigned, mul for "multiple languages", und for "undefined", and zxx for "no linguistic content, not applicable".


Code space


Alpha-2 code space

"Alpha-2" codes (for codes composed of 2 letters of the ISO basic Latin alphabet) are used in ISO 639-1. When codes for a wider range of languages were desired, more than 2 letter combinations could cover (a maximum of 262 = 676),
ISO 639-2 ISO 639- 2:1998, ''Codes for the representation of names of languages — Part 2: Alpha-3 code'', is the second part of the ISO 639 standard, which lists codes for the representation of the names of languages. The three-letter codes given for ea ...
was developed using Alpha-3 codes. (However, the latter was formally published first.)


Alpha-3 code space

"Alpha-3" codes (for codes composed of 3 letters of the ISO basic Latin alphabet) are used in
ISO 639-2 ISO 639- 2:1998, ''Codes for the representation of names of languages — Part 2: Alpha-3 code'', is the second part of the ISO 639 standard, which lists codes for the representation of the names of languages. The three-letter codes given for ea ...
,
ISO 639-3 ISO 639-3:2007, ''Codes for the representation of names of languages – Part 3: Alpha-3 code for comprehensive coverage of languages'', is an international standard for language codes in the ISO 639 series. It defines three-letter codes for ...
, and ISO 639-5. The number of languages and language groups that can be so represented is 263 = 17,576. The common use of Alpha-3 codes by three parts of ISO 639 requires some coordination within a larger system. Part 2 defines four special codes mis, mul, und, zxx, a reserved range qaa-qtz (20 × 26 = 520 codes) and has 20 double entries (the B/T codes), plus 2 entries with deprecated B-codes. This sums up to 520 + 22 + 4 = 546 codes that cannot be used in part 3 to represent languages or in part 5 to represent language families or groups. The remainder is 17,576 – 546 = 17,030. There are somewhere around six or seven thousand languages on Earth today. So those 17,030 codes are adequate to assign a unique code to each language, although some languages may end up with arbitrary codes that sound nothing like the traditional name(s) of that language.


Alpha-4 code space (withdrawn)

"Alpha-4" codes (for codes composed of 4 letters of the ISO basic Latin alphabet) were proposed to be used in
ISO 639-6 ISO 639-6, ''Codes for the representation of names of languages — Part 6: Alpha-4 code for comprehensive coverage of language variants'', was a proposed international standard in the ISO 639 series, developed bISO/TC 37/SC 2(International Organi ...
, which has been withdrawn. The upper limit for the number of languages and dialects that can be represented is 264 = 456,976.


See also

* IETF language tags (based on ISO 639) * ISO 3166 (codes for countries) * ISO 15924 (codes for writing systems) * Codes for constructed languages * Language code *
Language families and languages A language family is a group of languages related through descent from a common ''ancestral language'' or ''parental language'', called the proto-language of that family. The term "family" reflects the tree model of language origination in his ...
*
List of languages This page is a list of lists of languages. Published lists * SIL International's '' Ethnologue: Languages of the World'' lists over spoken and signed languages. *The International Organization for Standardization (ISO) assigns codes for most ...
*
List of official languages This is a list of official, or otherwise administratively-recognized, languages of sovereign countries, regions, and supra-national institutions. The article also lists a number of languages which have no administrative mandate as an official la ...
* Lists of ISO 639 codes


Notes and references


External links


Official ISO 639-1/RA (Registration Authority) Infoterm

Official ISO 639-2/RA (Registration Authority) Library of Congress

Official ISO 639-3/RA (Registration Authority) SIL International

Official ISO 693-5/RA (Registration Authority) Library of Congress

Official ISO 639-6/RA (Registration Authority) Geolang

Common Locale Data Repository
which contains translations of ISO 639 codes in other languages in an XML format. Th
CLDR survey tool
also contains a more readable format of the data. {{ISO standards #00639 Language identifiers Internationalization and localization 1967 introductions