This is the ValueSet that contains all the codes in ObservationCodesSCT (http://hl7.dk/fhir/hackathons/ValueSet/ObservationCodesSCT) and ObservationCodesSCT (http://hl7.dk/fhir/hackathons/ValueSet/ObservationCodesSCT). E.g. what you have to deal with if you get resources containing codes in either of them