This is the ValueSet that contains all the codes in Vaccine: CVX (http://hl7.org/fhir/uv/shc-vaccination/ValueSet/vaccine-cvx) and Immunization / All / CVX (http://hl7.org/fhir/uv/shc-vaccination/ValueSet/immunization-all-cvx). E.g. what you have to deal with if you get resources containing codes in either of them