This is the ValueSet that contains all the codes in EHMI Endpoint Register (EER) - MessageDefinitionIdentifierSystem Valueset (http://medcomehmi.dk/ig/terminology/ValueSet/eer-messagedefinition-identifer-system-valueset) and EHMI Endpoint Register (EER) - MessageDefinitionIdentifierSystem Valueset (http://medcomehmi.dk/ig/terminology/ValueSet/eer-messagedefinition-identifer-system-valueset). E.g. what you have to deal with if you get resources containing codes in either of them