ISO 639-4:2010 Preview
Codes for the representation of names of languages -- Part 4: General principles of coding of the representation of names of languages and related entities, and application guidelines
This standard was last reviewed and confirmed* in 2016.
*Therefore this version remains current
ISO 639-4:2010 gives the general principles of language coding using the codes that are specified in the other parts of ISO 639 and their combination with other codes. It also lays down guidelines for the use of any combination of the parts of ISO 639.
The terminology and general descriptions of ISO 639-4 are intended to replace corresponding text of other parts of ISO 639 as relevant in future revisions.
Relevant metadata for the description of linguistic entities are given, as a framework for databases of linguistic data to support the ISO 639 series.