CBOR data definition language: a notational convention to express CBOR data structures.
draft-greevenbosch-appsawg-cbor-cddl-06

• Status
• IESG evaluation record
• IESG writeups
• Email expansions
• History

• Versions
• 00
• 01
• 02
• 03
• 04
• 05
• 06
• 07
• 08
• 09
• 10
• 11

Network Working Group                                          C. Vigano
Internet-Draft                                       Universitaet Bremen
Intended status: Informational                               H. Birkholz
Expires: January 6, 2016                                  Fraunhofer SIT
                                                           July 05, 2015

 CBOR data definition language: a notational convention to express CBOR
                            data structures.
                draft-greevenbosch-appsawg-cbor-cddl-06

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

   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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on January 6, 2016.

Copyright Notice

   Copyright (c) 2015 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
   (http://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 and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of

Vigano & Birkholz        Expires January 6, 2016                [Page 1]
Internet-Draft                CBOR notation                    July 2015

   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  . . . . . . . . . . . . .   5
       2.1.1.  Usage . . . . . . . . . . . . . . . . . . . . . . . .   7
       2.1.2.  Syntax  . . . . . . . . . . . . . . . . . . . . . . .   8
     2.2.  Types . . . . . . . . . . . . . . . . . . . . . . . . . .   8
       2.2.1.  Values  . . . . . . . . . . . . . . . . . . . . . . .   8
       2.2.2.  Choices . . . . . . . . . . . . . . . . . . . . . . .   8
       2.2.3.  Representation Types  . . . . . . . . . . . . . . . .  10
       2.2.4.  Root type . . . . . . . . . . . . . . . . . . . . . .  10
   3.  Syntax  . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
     3.1.  General conventions . . . . . . . . . . . . . . . . . . .  11
     3.2.  Occurrence  . . . . . . . . . . . . . . . . . . . . . . .  12
     3.3.  Predefined names for types  . . . . . . . . . . . . . . .  12
     3.4.  Arrays  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     3.5.  Maps  . . . . . . . . . . . . . . . . . . . . . . . . . .  14
       3.5.1.  Structs . . . . . . . . . . . . . . . . . . . . . . .  14
       3.5.2.  Tables  . . . . . . . . . . . . . . . . . . . . . . .  17
     3.6.  Tags  . . . . . . . . . . . . . . . . . . . . . . . . . .  17
   4.  Examples  . . . . . . . . . . . . . . . . . . . . . . . . . .  18
     4.1.  Moves in a computer game  . . . . . . . . . . . . . . . .  18
     4.2.  Fruit . . . . . . . . . . . . . . . . . . . . . . . . . .  23
     4.3.  RFC 7071  . . . . . . . . . . . . . . . . . . . . . . . .  24
     4.4.  Examples from JSON Content Rules  . . . . . . . . . . . .  28
   5.  Making Use of CDDL  . . . . . . . . . . . . . . . . . . . . .  30
     5.1.  As a guide to a human user  . . . . . . . . . . . . . . .  30
     5.2.  For automated checking of CBOR data structure . . . . . .  30
     5.3.  For data analysis tools . . . . . . . . . . . . . . . . .  30
   6.  Open Issues . . . . . . . . . . . . . . . . . . . . . . . . .  31
   7.  Resolved Issues . . . . . . . . . . . . . . . . . . . . . . .  31
   8.  Security considerations . . . . . . . . . . . . . . . . . . .  32
   9.  IANA considerations . . . . . . . . . . . . . . . . . . . . .  32
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  32
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  32