RFC 3066: Tags for the Identification of Languages http://www.ietf.org/rfc/rfc3066.txt
ISO 639: Codes for the Representation of Names of Languages http://www.loc.gov/standards/iso639-2/langcodes.html
ISO 3166: Codes for Country Names http://www.iso.org/iso/en/prods-services/iso3166ma/02iso-3166-code-lists/list-en1.html
IANA language tag registry http://www.iana.org/assignments/language-tags
Authoring Techniques for XHTML & HTML Internationalization: Specifying the language of content http://www.w3.org/TR/i18n-html-tech-lang/
Other W3C I18N resources relating to language http://www.w3.org/International/resource-index.html#lang
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