http://www.rfc-editor.org/rfc/rfc7952.txt
RFC 7952: Defining and Using Metadata with YANG, L. Lhotka2016-08-01T23:00:00-00:00This document defines a YANG extension that allows for defining metadata annotations in YANG modules. The document also specifies XML and JSON encoding of annotations and other rules for annotating instances of YANG data nodes.