This is the ValueSet that contains all the codes in Healthcare Professional Roles - IPS (http://hl7.org/fhir/uv/ips/ValueSet/healthcare-professional-roles-uv-ips) and eHDSI Healthcare Professional Role (http://terminology.ehdsi.eu/ValueSet/eHDSIHealthcareProfessionalRole). E.g. what you have to deal with if you get resources containing codes in either of them