This is the ValueSet that contains all the codes in Endpoint Payload Type Value Set (http://hl7.org/fhir/us/davinci-pdex/ValueSet/EndpointPayloadTypeVS) and Endpoint Payload Type Value Set (http://hl7.org/fhir/us/davinci-pdex/ValueSet/EndpointPayloadTypeVS). E.g. what you have to deal with if you get resources containing codes in either of them