{description: 'The first resource in the bundle, if the bundle type is \"message\" - this is a message header, and this parameter provides access to search its contents', package_name: hl7.fhir.r6.core, name: message, type: resource, package_version: 6.0.0-ballot3, class: unknown, kind: null, url: 'http://hl7.org/fhir/SearchParameter/Bundle-message', version: 6.0.0-ballot3}