|  |  | Language tagging (BCP 47)
			Current IETF documents
				
					
						RFC 5646:
							Tags for Identifying Languages (BCP)
					
						RFC 4647:
							Matching of Language Tags (BCP)
					
						RFC 5645:
							Update to the Language Subtag Registry (Informational)
					
						RFC 6067:
							BCP 47 Extension U (Informational)
					
						RFC 6497:
							BCP 47 Extension T - Transformed Content (Informational)(see also
						LDML and
						CLDR data
						for extensions T and U)
Official registries hosted by IANA
				
			
				IETF-Languages
				
				
				discussion list
				(old archive here)
				
			Works by Richard Ishida (W3C):
				
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