{description: 'Search by recommended type of performer (e.g., Requester, Performer, Scheduler).', package_name: hl7.fhir.r2b.core, name: performer, type: token, package_version: 1.4.0, class: unknown, kind: null, url: 'http://hl7.org/fhir/SearchParameter/Task-performer', version: null}