This is the ValueSet that contains all the codes in MedComCareCommunicationMessageActivityCodes (http://medcomfhir.dk/ig/terminology/ValueSet/medcom-careCommunication-messagingActivities) and MedComCareCommunicationMessageActivityCodes (http://medcomfhir.dk/ig/terminology/ValueSet/medcom-careCommunication-messagingActivities). E.g. what you have to deal with if you get resources containing codes in either of them