{description: The vaccine administration event being evaluated, package_name: hl7.fhir.r4.examples, name: immunization-event, type: reference, package_version: 4.0.1, class: unknown, kind: null, url: 'http://hl7.org/fhir/SearchParameter/ImmunizationEvaluation-immunization-event', version: 4.0.1}