{description: This SearchParameter enables query of subscriptions by canonical topic url., package_name: hl7.fhir.uv.subscriptions, name: SubscriptionTopicSearchParameter, type: string, package_version: backport-1.2.0-ballot, class: unknown, kind: null, url: 'http://hl7.org/fhir/uv/subscriptions-backport/SearchParameter/Subscription-topic', version: 1.2.0-ballot}