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