This is the ValueSet that contains all the codes in Before/after procedure (http://hl7.eu/fhir/ig/pcsp/ValueSet/vs-sct-timing-eu-pcsp) and Before/after procedure (http://hl7.eu/fhir/ig/pcsp/ValueSet/vs-sct-timing-eu-pcsp). E.g. what you have to deal with if you get resources containing codes in either of them