This is the ValueSet that contains all the codes in CDS Hook Types Value Set (http://hl7.org/fhir/us/davinci-crd/ValueSet/cdsHookType) and CDS Hook Types Value Set (http://hl7.org/fhir/us/davinci-crd/ValueSet/cdsHookType). E.g. what you have to deal with if you get resources containing codes in either of them