This is the ValueSet that contains all the codes in HCProfessional.hcSpecialisation (http://fhir.ch/ig/ch-epr-term/ValueSet/HCProfessional.hcSpecialisation) and HCProfessional.hcSpecialisation (http://fhir.ch/ig/ch-term/ValueSet/HCProfessional.hcSpecialisation). E.g. what you have to deal with if you get resources containing codes in either of them