This is the CodeSystem that contains all the codes in ISO 3166-2 Codes for the representation of names of countries and their subdivisions — Part 2: Country subdivision code (urn:iso:std:iso:3166:-2) and ISO 3166-2 Codes for the representation of names of countries and their subdivisions — Part 2: Country subdivision code (urn:iso:std:iso:3166:-2). E.g. what you have to deal with if you get resources containing codes in either of them