1.2.1 Normative References
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[ISO-639] International Organization for Standardization, "Codes for the Representation of Names of Languages", ISO 639, http://www.loc.gov/standards/iso639-2/
[ISO-3166] International Organization for Standardization, "Codes for the representation of names of countries and their subdivisions -- Part1:Country codes", ISO 3166-1:2013, November 2013, http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=63545
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[ISO-15924] International Organization for Standardization, "ISO 15924 Registration Authority", http://www.unicode.org/iso15924/
[MS-DTYP] Microsoft Corporation, "Windows Data Types".
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997, http://www.rfc-editor.org/rfc/rfc2119.txt
[RFC4646] A. Phillips, Ed., and M. Davis, Ed., "Tags for Identifying Languages", BCP 47, RFC 4646, September 2006, http://www.ietf.org/rfc/rfc4646.txt