This is the ValueSet that contains all the codes in Finnish ValueSet for systems of registry specifiers (https://hl7.fi/fhir/finnish-base-profiles/ValueSet/fi-base-register-identifier) and Finnish ValueSet for systems of registry specifiers (https://hl7.fi/fhir/finnish-base-profiles/ValueSet/fi-base-register-identifier). E.g. what you have to deal with if you get resources containing codes in either of them