This is the ValueSet that contains all the codes in EPA AuditEvent Purpose of Event (https://gematik.de/fhir/epa/ValueSet/epa-auditevent-purpose-of-event-vs) and PurposeOfUse (http://terminology.hl7.org/ValueSet/v3-PurposeOfUse). E.g. what you have to deal with if you get resources containing codes in either of them