This is the ValueSet that contains all the codes in IHE MimeType (http://medcomfhir.dk/ig/xdsmetadata/ValueSet/MedCom-ihe-core-mimetype-VS) and IHE MimeType (http://medcomfhir.dk/ig/xdsmetadata/ValueSet/MedCom-ihe-core-mimetype-VS). E.g. what you have to deal with if you get resources containing codes in either of them