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ISO 639 consists of different parts, of which two parts are currently published. The other parts are works in progress.

There are two items for ISO 639:
  • ISO 639-1 : 2002 ''Codes for the representation of names of languages -- Part 1: Alpha-2 code''

  • ISO 639-2 : 1998 ''Codes for the representation of names of languages -- Part 2: Alpha-3 code''

    • The following parts are still being developed:

  • ISO 639-3 : 2006? ''Codes for the representation of names of languages -- Part 3: Alpha-3 code for comprehensive coverage of languages'' {Link without Title}

  • ISO 639-4 : 2007? ''Codes for the representation of names of languages -- Part 4: Implementation guidelines and general principles for language coding''

  • ISO 639-5 : 2006? ''Codes for the representation of names of languages -- Part 5: Alpha-3 code for language families and groups''

  • ISO 639-6 : 2007? ''Codes for the representation of names of languages -- Part 6: Alpha-4 representation for comprehensive coverage of language variation''



ALPHA-3 CODE SPACE

Since the code is three letter alphabetic one upper bound for the number of languages and language collections that can be represented is 26 × 26 × 26 = 17 576.
Part 2 defines two special codes mul, und, a reserved range qaa-qtz (500 codes) and has 23 double entries (the B/T codes). This sums up to 545 codes that cannot be used in part 3 to represent languages or in part 5 to represent language collections.
The remainder is 17 576 - 545 = 17 032.


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