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In August 2022, version 2.1 was published to allow description filters to filter results using description identifiers, and to harmonise the dialect alias filter (see Appendix C) with BCP-47 (Internet Best Current Practice Specification).

In November 2023 version 2.2 was published. This version added the ability to reference concepts using alternate identifiers, and also two convenience methods for finding the top (root) or bottom (leaf) concepts within a set.

For a list of previous PDF versions, please refer to Previous Versions