https://app.knowbase.one/vault/rfc/docid/2758
RFC2482: Language Tagging in Unicode Plain Text
Network Working Group K. Whistler Request for Comments: 2482 Sybase Category: Informational G. Adams Spyglass ...
https://app.knowbase.one/vault/rfc/docid/6614
RFC6082: Deprecating Unicode Language Tag Characters: RFC 2482 is Historic
Internet Engineering Task Force (IETF) K. Whistler Request for Comments: 6082 Sybase, Inc. Obsoletes: 2482 G. Adams Category: Informational Skynav (Phil), Inc. IS...