{description: Reference to the Appointment that preceded this appointment in a series, package_name: hl7.fhir.r6.core, name: previous-appointment, type: reference, package_version: 6.0.0-ballot3, class: unknown, kind: null, url: 'http://hl7.org/fhir/SearchParameter/Appointment-previous-appointment', version: 6.0.0-ballot3}