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