This is the ValueSet that contains all the codes in hl7VS-countryCode-3alpha (http://terminology.hl7.org/ValueSet/v2-notAllCodes-0399) and hl7VS-countryCode-3alpha (http://terminology.hl7.org/ValueSet/v2-notAllCodes-0399). E.g. what you have to deal with if you get resources containing codes in either of them