This is the ValueSet that contains all the codes in RTLS Message Events Valueset (http://hl7.org/fhir/uv/rtls/ValueSet/rtlsMessageEvents) and RTLS Message Events Valueset (http://hl7.org/fhir/uv/rtls/ValueSet/rtlsMessageEvents). E.g. what you have to deal with if you get resources containing codes in either of them