{description: The specific service (by HealthcareService) that is to be performed during this appointment, package_name: hl7.fhir.r6.core, name: service-type-reference, type: reference, package_version: 6.0.0-ballot1, class: unknown, kind: null, url: 'http://hl7.org/fhir/SearchParameter/Appointment-service-type-reference', version: 6.0.0-ballot1}