This is the ValueSet that contains all the codes in ActRelationshipExcerpt (http://terminology.hl7.org/ValueSet/v3-ActRelationshipExcerpt) and ActRelationshipExcerpt (http://terminology.hl7.org/ValueSet/v3-ActRelationshipExcerpt). E.g. what you have to deal with if you get resources containing codes in either of them