This is the ValueSet that contains all the codes in CH EPREG VS: Fetal RhD Antigen (http://fhir.ch/ig/ch-epreg/ValueSet/fetal-rhd-antigen) and CH EPREG VS: Fetal RhD Antigen (http://fhir.ch/ig/ch-epreg/ValueSet/fetal-rhd-antigen). E.g. what you have to deal with if you get resources containing codes in either of them