Concise data definition language (CDDL): a notational convention to express CBOR data structures
draft-greevenbosch-appsawg-cbor-cddl-11

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Last updated 2017-07-03
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Network Working Group                                        H. Birkholz
Internet-Draft                                            Fraunhofer SIT
Intended status: Informational                                 C. Vigano
Expires: January 4, 2018                             Universitaet Bremen
                                                              C. Bormann
                                                 Universitaet Bremen TZI
                                                           July 03, 2017

  Concise data definition language (CDDL): a notational convention to
                      express CBOR data structures
                draft-greevenbosch-appsawg-cbor-cddl-11

Abstract

   This document proposes a notational convention to express CBOR data
   structures (RFC 7049).  Its main goal is to provide an easy and
   unambiguous way to express structures for protocol messages and data
   formats that use CBOR.

Status of This Memo

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   This Internet-Draft will expire on January 4, 2018.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Birkholz, et al.         Expires January 4, 2018                [Page 1]
Internet-Draft                    CDDL                         July 2017

   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  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements notation . . . . . . . . . . . . . . . . . .   4
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  The Style of Data Structure Specification . . . . . . . . . .   4
     2.1.  Groups and Composition in CDDL  . . . . . . . . . . . . .   6
       2.1.1.  Usage . . . . . . . . . . . . . . . . . . . . . . . .   8
       2.1.2.  Syntax  . . . . . . . . . . . . . . . . . . . . . . .   8
     2.2.  Types . . . . . . . . . . . . . . . . . . . . . . . . . .   8
       2.2.1.  Values  . . . . . . . . . . . . . . . . . . . . . . .   9
       2.2.2.  Choices . . . . . . . . . . . . . . . . . . . . . . .   9
       2.2.3.  Representation Types  . . . . . . . . . . . . . . . .  10
       2.2.4.  Root type . . . . . . . . . . . . . . . . . . . . . .  11
   3.  Syntax  . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
     3.1.  General conventions . . . . . . . . . . . . . . . . . . .  11
     3.2.  Occurrence  . . . . . . . . . . . . . . . . . . . . . . .  13
     3.3.  Predefined names for types  . . . . . . . . . . . . . . .  14
     3.4.  Arrays  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     3.5.  Maps  . . . . . . . . . . . . . . . . . . . . . . . . . .  15
       3.5.1.  Structs . . . . . . . . . . . . . . . . . . . . . . .  15
       3.5.2.  Tables  . . . . . . . . . . . . . . . . . . . . . . .  18
     3.6.  Tags  . . . . . . . . . . . . . . . . . . . . . . . . . .  19
     3.7.  Unwrapping  . . . . . . . . . . . . . . . . . . . . . . .  19
     3.8.  Controls  . . . . . . . . . . . . . . . . . . . . . . . .  20
       3.8.1.  Control operator .size  . . . . . . . . . . . . . . .  21
       3.8.2.  Control operator .bits  . . . . . . . . . . . . . . .  21
       3.8.3.  Control operator .regexp  . . . . . . . . . . . . . .  22
       3.8.4.  Control operators .cbor and .cborseq  . . . . . . . .  23
       3.8.5.  Control operators .within and .and  . . . . . . . . .  23
       3.8.6.  Control operators .lt, .le, .gt, .ge, .eq, .ne, and
               .default  . . . . . . . . . . . . . . . . . . . . . .  24
     3.9.  Socket/Plug . . . . . . . . . . . . . . . . . . . . . . .  24
     3.10. Generics  . . . . . . . . . . . . . . . . . . . . . . . .  26
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