This is the ValueSet that contains all the codes in DEX mapping language mime types (http://hl7.org/fhir/uv/sdc/ValueSet/dex-mimetype) and DEX mapping language mime types (http://hl7.org/fhir/uv/sdc/ValueSet/dex-mimetype). E.g. what you have to deal with if you get resources containing codes in either of them