Additional Control Operators for the Concise Data Definition Language (CDDL)

The Concise Data Definition Language (CDDL), standardized in RFC 8610, provides "control operators" as its main language extension point. The present document defines a number of control operators that were not yet ready at the time RFC 8610 was completed: .plus, .cat, and .det for the construction of constants; .abnf/.abnfb for including ABNF (RFC 5234 and RFC 7405) in CDDL specifications; and .feature for indicating the use of a non-basic feature in an instance. Stream: RFC: Category: Published: ISSN: Author: Internet Engineering Task Force (IETF) 9165 Standards Track December 2021 2070-1721 C. Bormann Universität Bremen TZI Status of This Memo This is an Internet Standards Track document. This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 7841. Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at . https://www.rfc-editor.org/info/rfc9165 Copyright Notice Copyright (c) 2021 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents ( ) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions https://trustee.ietf.org/license-info Bormann Standards Track Page 1 with respect to this document. Code Components extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License. Table of