A feature freezer for the Concise Data Definition Language (CDDL)
draft-bormann-cbor-cddl-freezer-04

Document Type Active Internet-Draft (individual)
Author Carsten Bormann 
Last updated 2020-06-15
Replaces draft-bormann-cddl-freezer
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Network Working Group                                         C. Bormann
Internet-Draft                                    Universit├Ąt Bremen TZI
Intended status: Informational                              15 June 2020
Expires: 17 December 2020

   A feature freezer for the Concise Data Definition Language (CDDL)
                   draft-bormann-cbor-cddl-freezer-04

Abstract

   In defining the Concise Data Definition Language (CDDL), some
   features have turned up that would be nice to have.  In the interest
   of completing this specification in a timely manner, the present
   document was started to collect nice-to-have features that did not
   make it into the first RFC for CDDL, RFC 8610.

   It is now time to discuss thawing some of the concepts discussed
   here.  A number of additional proposals have been added.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on 17 December 2020.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Bormann                 Expires 17 December 2020                [Page 1]
Internet-Draft            CDDL feature freezer                 June 2020

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents (https://trustee.ietf.org/
   license-info) in effect on the date of publication of this document.
   Please review these documents carefully, as they describe your rights
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   provided without warranty as described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Base language features  . . . . . . . . . . . . . . . . . . .   3
     2.1.  Cuts  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Literal syntax  . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Tag-oriented Literals . . . . . . . . . . . . . . . . . .   3
     3.2.  Regular Expression Literals . . . . . . . . . . . . . . .   3
   4.  Controls  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     4.1.  Control operator .pcre  . . . . . . . . . . . . . . . . .   4
     4.2.  Endianness in .bits . . . . . . . . . . . . . . . . . . .   4
     4.3.  .bitfield control . . . . . . . . . . . . . . . . . . . .   4
   5.  Co-occurrence Constraints . . . . . . . . . . . . . . . . . .   5
   6.  Module superstructure . . . . . . . . . . . . . . . . . . . .   5
     6.1.  Namespacing . . . . . . . . . . . . . . . . . . . . . . .   6
   7.  Alternative Representations . . . . . . . . . . . . . . . . .   6
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   9.  Security considerations . . . . . . . . . . . . . . . . . . .   6
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   6
     10.2.  Informative References . . . . . . . . . . . . . . . . .   7
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .   8
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   In defining the Concise Data Definition Language (CDDL), some
   features have turned up that would be nice to have.  In the interest
   of completing this specification in a timely manner, the present
   document was started to collect nice-to-have features that did not
   make it into the first RFC for CDDL [RFC8610].

   It is now time to discuss thawing some of the concepts discussed
   here.  A number of additional proposals have been added.

   There is always a danger for a document like this to become a
   shopping list; the intention is to develop this document further
   based on real-world experience with the first CDDL standard.

Bormann                 Expires 17 December 2020                [Page 2]
Internet-Draft            CDDL feature freezer                 June 2020

2.  Base language features

2.1.  Cuts

   Section 3.5.4 of [RFC8610] alludes to a new language feature, _cuts_,
   and defines it in a fashion that is rather focused on a single
   application in the context of maps and generating better diagnostic
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