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 each language in this part of the standard are referred to as "Alpha-3" codes. There are 487 entries in the list of ISO 639-2 codes.
The US Library of Congress is the registration authority for ISO 639-2. As registration authority, the LOC receives and reviews proposed changes; they also have representation on the ISO 639-RA Joint Advisory Committee responsible for maintaining the ISO 639 code tables.
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History and relationship to other ISO 639 standards
Work was begun on the ISO 639-2 standard in 1989, because the ISO 639-1 standard, which uses only two-letter codes for languages, is not able to accommodate a sufficient number of languages. The ISO 639-2 standard was first released in 1998.In practice, ISO 639-2 has largely been superseded by ISO 639-3, which includes codes for all the individual languages in ISO 639-2 plus many more. It also includes the special and reserved codes, and is designed not to conflict with ISO 639-2. ISO 639-3, however, does not include any of the collective languages in ISO 639-2; most of these are included in ISO 639-5.
B and T codes
While most languages are given one code by the standard, twenty of the languages described have two three-letter codes, a "bibliographic" code, which is derived from the English name for the language and was a necessary legacy feature, and a "terminological" code, which is derived from the native name for the language and resembles the language's two-letter code in ISO 639-1. There were originally 22 B codes; and are deprecated.In general the T codes are favored; ISO 639-3 uses ISO 639-2/T.
Scopes and types
The codes in ISO 639-2 have a variety of "scopes of denotation", or types of meaning and use, some of which are described in more detail below.- Individual languages
- Macrolanguages
- [|Collections of languages]
- Dialects
- Reserved for local use
- [|Special situations]
Individual languages are further classified as to type:
- Living languages
- Extinct languages
- Ancient languages
- Historic languages
- Constructed languages
Collections of languages
The collective language codes in ISO 639-2 are listed below. Some language groups are noted to be remainder groups, that is excluding languages with their own codes, while other are not. Remainder groups are
afa, alg, art, ath, bat, ber, bnt, cai, cau, cel, crp, cus, dra, fiu, gem, inc, ine, ira, khi, kro, map, mis, mkh, mun, nai, nic, paa, roa, sai, sem, sio, sit, sla, ssa, tai and tut, while inclusive groups are apa, arn, arw, aus, bad, bai, bih, cad, car, chb, cmc, cpe, cpf, cpp, dua, hmn, iro, mno, mul, myn, nub, oto, phi, sgn, wak, wen, ypk and znd.The following code is identified as a collective code in ISO 639-2 but is missing from ISO 639-5:
Codes registered for 639-2 that are listed as collective codes in ISO 639-5 :
Reserved for local use
The interval from to is "reserved for local use" and is not used in ISO 639-2 nor in ISO 639-3. These codes are typically used privately for languages not in either standard. Microsoft Windows uses the language code for pseudo-locales generated automatically from English strings, designed for testing software localization.Special situations
There are four generic codes for special situations:- is listed as "uncoded languages"
- is applied when several languages are used and it is not practical to specify all the appropriate language codes
- is used in situations in which a language or languages must be indicated but the language cannot be identified.
- is listed in the code list as "no linguistic content", e.g. animal sounds