The following schema file is empty:
https://forge.etsi.org/rep/nfv/api-tests/blob/master/SOL002/VNFLifecycleManagement-API/schemas/VnfIdentifierCreationNotification.schema.json
The definition should be at:
https://forge.etsi.org/rep/nfv/SOL002-SOL003/blob/v2.4.1/src/definitions/SOL002SOL003VNFLifecycleManagement_def.yaml#L704