This is the ValueSet that contains all the codes in HRex Endpoint Name (http://hl7.org/fhir/us/davinci-hrex/ValueSet/hrex-endpoint-name) and HRex Endpoint Name (http://hl7.org/fhir/us/davinci-hrex/ValueSet/hrex-endpoint-name). E.g. what you have to deal with if you get resources containing codes in either of them