{description: 'Mime type of the content, with charset etc.', package_name: hl7.fhir.r6.core, name: contenttype, type: token, package_version: 6.0.0-ballot2, class: unknown, kind: null, url: 'http://hl7.org/fhir/SearchParameter/DocumentReference-contenttype', version: 6.0.0-ballot2}