For example, most people in Central America and South America speak Spanish. Spanish spoken in Mexico will be slightly different from Spanish spoken in Peru. Different regions of Mexico will have slightly different dialects and accents of Spanish. A language code scheme might group these all as "Spanish" for choosing a keyboard layout, most as "Spanish" for general usage, or separate each dialect to allow region-specific idioms.
|Codes for English||Codes for Spanish|
|ISO 639||The original ISO standard from 1967 to 2002. Now obsolete, it was replaced by ISO 639-1, ISO 639-2, and ISO 639-3. Sometimes used as a shorthand for the union of all 639 standard codes.|| |
|ISO 639-1||Two-letter code system made official in 2002, containing 136 codes. Many systems use two-letter ISO 639-1 codes supplemented by three-letter ISO 639-2 codes when no two-letter code is applicable.|
(from List of ISO_639-1 codes)
|ISO 639-2||Three-letter system of 464 codes.|| |
(from List of ISO 639-2 codes)
|ISO 639-3||An extension of ISO 639-2 to cover all known, living or dead, spoken or written languages in 7,589 entries.|
(from List of ISO 639-3 codes)
|Old SIL codes||Codes created for use in the Ethnologue, a publication of SIL International that lists language statistics. The publication now uses ISO 639-3 codes.||SPN|
|IETF language tag||An IETF best practice, currently specified by RFC 4646 and RFC 4647, for language tags easy to parse by computer. The tag system is extensible to region, dialect, and private designations.|| |
(source: IETF memo)
|Verbix Language Codes||Constructed codes starting with old SIL codes and adding more information.|
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