A feature freezer for the Concise Data Definition Language (CDDL)
draft-bormann-cbor-cddl-freezer-02

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Network Working Group                                         C. Bormann
Internet-Draft                                   Universitaet Bremen TZI
Intended status: Informational                             July 22, 2019
Expires: January 23, 2020

   A feature freezer for the Concise Data Definition Language (CDDL)
                   draft-bormann-cbor-cddl-freezer-02

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

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   This Internet-Draft will expire on January 23, 2020.

Copyright Notice

   Copyright (c) 2019 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
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Base language features  . . . . . . . . . . . . . . . . . . .   2
     2.1.  Cuts  . . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Literal syntax  . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Computed Literals . . . . . . . . . . . . . . . . . . . .   3
     3.2.  Tag-oriented Literals . . . . . . . . . . . . . . . . . .   3
     3.3.  Regular Expression Literals . . . . . . . . . . . . . . .   3
   4.  Embedded ANBF . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Controls  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     5.1.  Control operator .pcre  . . . . . . . . . . . . . . . . .   4
     5.2.  Endianness in .bits . . . . . . . . . . . . . . . . . . .   4
     5.3.  .bitfield control . . . . . . . . . . . . . . . . . . . .   5
   6.  Co-occurrence Constraints . . . . . . . . . . . . . . . . . .   5
   7.  Module superstructure . . . . . . . . . . . . . . . . . . . .   6
     7.1.  Namespacing . . . . . . . . . . . . . . . . . . . . . . .   6
   8.  Alternative Representations . . . . . . . . . . . . . . . . .   6
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   10. Security considerations . . . . . . . . . . . . . . . . . . .   7
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     11.1.  Normative References . . . . . . . . . . . . . . . . . .   7
     11.2.  Informative References . . . . . . . . . . . . . . . . .   7
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .   8
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   (TO DO: Insert an extended form of the abstract first here, expanding
   the reference to [RFC8610].)

   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.

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
   information about them.

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   The present document is expected to grow a more complete definition
   of cuts, with the expectation that it will be upwards-compatible to