http://www.rfc-editor.org/rfc/rfc8198.txt
RFC 8198: Aggressive Use of DNSSEC-Validated Cache, K. Fujiwara, A. Kato, W. Kumari2017-07-01T23:00:00-00:00This document updates RFC 4035 by allowing validating resolvers to generate negative answers based upon NSEC/NSEC3 records and positive answers in the presence of wildcards.