http://www.rfc-editor.org/rfc/rfc7451.txt
RFC 7451: Extension Registry for the Extensible Provisioning Protocol, S. Hollenbeck2015-02-01T23:00:00-00:00The Extensible Provisioning Protocol (EPP) includes features to add functionality by extending the protocol. It does not, however, describe how those extensions are managed. This document describes a procedure for the registration and management of extensions to EPP, and it specifies a format for an IANA registry to record those extensions.