what is the history of language tags? - EAS

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  1. History [ edit] IETF language tags were first defined in RFC 1766, edited by Harald Tveit Alvestrand, published in March 1995. The tags used ISO 639 two-letter language codes and ISO 3166 two-letter country codes, and allowed registration of whole tags that included variant or script subtags of three to eight letters.
    en.wikipedia.org/wiki/IETF_language_tag
    en.wikipedia.org/wiki/IETF_language_tag
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    What is a language tag?A language tag is composed of a sequence of one or more subtags such as language, region, variant and script subtags. When a language tag is comprised of more than one subtag, the subtag values are separated by the "-" character.
    www.techonthenet.com/js/language_tags.php
    What is the history of HTML language tags?Language tags for HTML were first formally defined in RFC 2070, F. Yergeau, et.al. Internationalization of the Hypertext Markup Language. RFC 2070 was incorporated into HTML 4, and has been reclassified as historic. Note there have been changes to ISO language codes. In 1989 iw, in, and ji were withdrawn and replaced by he, id, and yi.
    www.w3.org/International/articles/language-tags/
    What is the latest RFC for language tags?The latest RFC describing language tag syntax is RFC 5646, Tags for the Identification of Languages, and it obsoletes the older RFCs 4646, 3066 and 1766. You used to find subtags by consulting the lists of codes in various ISO standards, but now you can find all subtags in the IANA Language Subtag Registry.
    www.w3.org/International/articles/language-tags/
    What is the difference between language tags and script tags?Only one script subtag can appear in a language tag, and it must immediately follow the language or any extlang subtag. It is always four letters long. You should only use script tags if they are necessary to make a distinction you need.
    www.w3.org/International/articles/language-tags/
  3. https://www.techonthenet.com/js/language_tags.php

    54 rows · The purpose of these language tags is to establish codes to help identify languages both spoken and written. A language tag is composed of a sequence of one or more subtags such as language, region, variant and script subtags. When a language tag is comprised of …

  4. https://www.w3.org/International/articles/language-tags

    Mar 3, 2014 · Language tag syntax is defined by the IETF's BCP 47. BCP stands for 'Best …

  5. https://en.wikipedia.org/wiki/IETF_language_tag

    IETF language tags were first defined in RFC 1766, edited by Harald Tveit Alvestrand, published in March 1995. The tags used ISO 639 two-letter language codes and ISO 3166 two-letter country codes, and allowed registration of whole tags that included variant or script subtags of three to eight letters.
    In January 2001, this was updated by RFC 3066, which added the use of ISO 639-2 three-letter c…

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    • https://www.ibm.com/docs/api/v1/content/ssw_ibm_i_74/rzahy/rzahylangtags.htm

      The language tag is a component of an attribute description. The language tag is a string with …

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