{description: 'The first resource in the bundle, if the bundle type is \"document\" - this is a composition, and this parameter provides access to searches its contents', package_name: hl7.fhir.r2.core, name: composition, type: reference, package_version: 1.0.2, class: unknown, kind: null, url: 'http://hl7.org/fhir/SearchParameter/Bundle-composition', version: null}