Import a PBRS-exported definition. The import family is selected from exported attributes, in this order: event package when ScheduleAttr.EventPackID and EventPackageAttr are populated; event-based when event definitions or conditions are present; package when ScheduleAttr.PackID and PackageAttr are populated; automation when ScheduleAttr.AutoID and AutomationAttr are populated; otherwise report. There is no single ScheduleType discriminator property on the import request. Preserve compatible exported collections and external prerequisites. The response wraps a string in returnModel; it is not a fixed nested object. Do not assume import is transactional or idempotent. Verify created objects and reconcile before retrying. For automation imports, returnModel contains JSON-encoded diagnostics for the imported attributes, with Value and Type entries. The example corresponds to an automation import with no tasks. Destination IDs are assigned during import. Diagnostic fields can vary with the exported collections.