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ISO 639 is a set of standards by the "International Organization for Standardization that is concerned with representation of names for "language 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It was also the name of the original standard, approved in 1967 (as ISO 639/R) and withdrawn in 2002.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 consists of five parts.
|Standard||Name (Codes for the representation of names of languages – ...)||Registration Authority||First edition||Current||No. in list|
|"ISO 639-1||Part 1: Alpha-2 code||"Infoterm||1967 (as ISO 639)||2002||"184|
|"ISO 639-2||Part 2: Alpha-3 code||"Library of Congress||1998||1998||"565 as of October 2015|
|"ISO 639-3||Part 3: Alpha-3 code for comprehensive coverage of languages||"SIL International||2007||2007||"7865 + local range as of October 2015|
|"ISO 639-4||Part 4: Implementation guidelines and general principles for language coding||ISO/TC 37/SC 2||2010-07-16||2010-07-16||(not a list)|
|"ISO 639-5||Part 5: Alpha-3 code for language families and groups||Library of Congress||2008-05-15||2008-05-15||"114|
|"ISO 639-6 (withdrawn)||Part 6: Alpha-4 representation for comprehensive coverage of language variants||Geolang||2009-11-17||withdrawn||21,000+|
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 ISO 639-6 was withdrawn in 2014.
Types (for individual languages):
Bibliographic and terminology codes
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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. The first four columns contain codes for a representative language that exemplifies a specific type of relation between the parts of ISO 639. The last column provides an explanation of the relationship, and the "#" 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" [fas].
|ISO 639-1||ISO 639-2||ISO 639-3||ISO 639-5||#||Description of example|
|en||eng||eng||(-)||132||Languages with one code in each part. (There 185 in Part 1, subtract all special cases for Part 1 codes, 185-2-25-17-4-2-1-1-1=132)|
|nb||nob||nob||(-)||2||An individual language that belongs to macrolanguage (nor), with same code in Part 2 and also has a code in Part 1. The two codes are: nob, non|
|ar||ara||ara (M)||(-)||25||"Part 3 macro, 55 macrolanguages total, subtract special cases, 55-24-4-1-1=25|
|de||ger/deu (B/T)||deu||(-)||15||Elements that have separate B and T codes in part 2, but not in any of the special cases in succeeding lines. 22 total, subtract special cases, 22-1-4-2=15.|
|cs||cze/ces (B/T)||ces||(-)||1||An element with separate B/T codes and the letters from the Part 1 code are not the first two letters of the T code.|
|fa||per/fas (B/T)||fas (M)||(-)||4||Macrolanguages in part 3 with separate B/T codes in part 2; the four T codes are: fas, msa, sqi, zho|
|hr||scr/hrv (B/T)||hrv||(-)||2||Languages with separate B/T codes in part 2, but the B code is deprecated. The two T codes are: hrv, srp. Deprecated 2008-06-28.|
|no ("M")||nor ("M")||nor (M)||(-)||1||Macrolanguages in part 3 which contain languages that have codes in Part 1, nor: non, nob; no: nn, nb|
|bh||bih||(-)||?||1||Bihari (bih) is marked as collective despite having an ISO 639-1 code which should only be for individual languages. The reason is that some individual "Bihari languages received an ISO 639-2 code, which makes Bihari a language family for the purposes of ISO 639-2, but a single language for the purposes of ISO 639-1. The single languages are: bho, mai, mag|
|sh||(-)||hbs (M)||(-)||1||Macrolanguage in part 3, no part 2 code, part 1 code deprecated|
|(bh)||bho||bho||(-)||3||Classified as individual languages in parts 2 & 3, do not belong to a macrolanguage, but in part 1 are covered by a code whose equivalent in part 2 is a collective. The three codes are: bho, mai, mag|
|(bh)||(bih)||sck||(-)||An individual language in part 3, no code in Part 2, does not belong to a macrolanguage, but in Part 1 is covered by a code whose equivalent in Part 2 is a collective.|
|(-)||car||car||car||An individual language in parts 2 & 3, but also included in Part 5 as a family|
|(-)||ast||ast||(-)||An individual language in parts 2 & 3, no code in Part 1.|
|(-)||bal||bal (M)||(-)||24||An individual language in Part 2 and macrolanguage in Part 3, no code in Part 1.|
|(-)||mis||mis||?||1||special code: available to be used in a context where a code is required, but the language has no code|
|(-)||mul||mul||?||1||special code: multilingual content|
|(-)||und||und||?||1||special code: undetermined|
|(-)||zxx||zxx||?||1||special code: no linguistic information (added 2006-01-11)|
|(-)||qaa||qaa||?||520||reserved for local use, range is qaa ... qtz|
|(-)||aus||(-)||aus||regular group in Part 2|
|(-)||afa||(-)||afa||In Part 2 a rest group, i.e. same code but different languages included. In Part 2 "afa" refers to an Afro-Asiatic language that does not have an individual-language identifier in Part 2, and that does not fall into the rest groups "ber - Berber (Other)", "cus - Cushitic (Other)", or "sem - Semitic (Other)", all of which are Afro-Asiatic language groups.|
|(ar)||(ara "M")||arb||(-)||An individual language, belongs to a macrolanguage (ara) in part 3, covered by the macrolanguage code in Part 2, also covered in Part 1.|
|(-)||(nic "R")||aaa||(-)||No code in part 1, in Part 2 best covered by a rest group, "Niger-Kodofanian (Other)"|
|(-)||(-)||(-)||sqj||Languages not coded in parts 1 & 2|
These differences are due to the following factors:
qtzare reserved for local use.
misfor languages that have no code yet assigned,
mulfor "multiple languages",
undfor "undefined", and
zxxfor "no linguistic content, not applicable".
engcorresponds to Part 2
engand Part 1
astcorresponds to Part 2
astbut lacks a code in Part 1.
ausin Part 2 and Part 5, which stands for "Australian languages.
"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 was developed using Alpha-3 codes (though the latter was formally published first).["citation needed]
"Alpha-3" codes (for codes composed of 3 letters of the "ISO basic Latin alphabet) are used in "ISO 639-2, "ISO 639-3, 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
zxx, a reserved range
qaa-qtz (20 × 26 = 520 codes) and has 23 double entries (the B/T codes). This sums up to 520 + 23 + 4 = 547 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 – 547 = 17,029.
There are somewhere around six or seven thousand languages on Earth today. So those 17,029 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" codes (for codes composed of 4 letters of the "ISO basic Latin alphabet) were proposed to be used in "ISO 639-6, which has been withdrawn. The upper limit for the number of languages and dialects that can be represented is 264 = 456,976.