This is the ValueSet that contains all the codes in DocumentAuditEventType (http://fhir.ch/ig/ch-epr-fhir/ValueSet/DocumentAuditEventType) and DocumentAuditEventType (http://fhir.ch/ig/ch-epr-fhir/ValueSet/DocumentAuditEventType). E.g. what you have to deal with if you get resources containing codes in either of them