ISO 639-6, Codes for the representation of names of languages — Part 6: Alpha-4 code for comprehensive coverage of language variants, was a proposed international standard in the ISO 639 series, developed by ISO/TC 37/SC 2 (International Organization for Standardization, Technical Committee 37, Subcommittee 2: Terminographical and lexicographical working methods – later renamed to Terminology workflow and language coding).
This allowed one to differentiate between, for example, historical (glvx) versus revived (rvmx) Manx, while ISO 639-3 only includes glv for Manx.
For example, the codes and ancestry of English is given below: The database differentiated between different scripts used for the same language.
For example, a number of different scripts were used in the Ottoman Empire and as a result the Ottoman Turkish language has been categorized as follows:
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