This is the ValueSet that contains all the codes in mTLS Signed Object Types (http://hl7.org/fhir/us/davinci-pdex/ValueSet/MtlsObjectTypeVS) and mTLS Signed Object Types (http://hl7.org/fhir/us/davinci-pdex/ValueSet/MtlsObjectTypeVS). E.g. what you have to deal with if you get resources containing codes in either of them