This is the ValueSet that contains all the codes in Dk Core IEEE Basic Observation (http://hl7.dk/fhir/core/ValueSet/dk-core-IEEEBasicObservation) and Dk Core IEEE Basic Observation (http://hl7.dk/fhir/core/ValueSet/dk-core-IEEEBasicObservation). E.g. what you have to deal with if you get resources containing codes in either of them