JSON Data Definition Format (JDDF)
draft-ucarion-jddf-00

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Independent Submission                                         U. Carion
Internet-Draft                                           August 22, 2019
Intended status: Informational
Expires: February 23, 2020

                   JSON Data Definition Format (JDDF)
                         draft-ucarion-jddf-00

Abstract

   JSON Data Definition Format (JDDF) is a portable method for
   describing the format of JavaScript Object Notation (JSON) data and
   the errors associated with ill-formed data.  JDDF is designed to
   enable code generation from schemas.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on February 23, 2020.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   described in the Simplified BSD License.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Syntax  . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Extending JDDF's syntax . . . . . . . . . . . . . . . . .  11
   3.  Semantics . . . . . . . . . . . . . . . . . . . . . . . . . .  12
     3.1.  Allowing additional properties  . . . . . . . . . . . . .  12
     3.2.  Errors  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     3.3.  Forms . . . . . . . . . . . . . . . . . . . . . . . . . .  13
       3.3.1.  Empty . . . . . . . . . . . . . . . . . . . . . . . .  14
       3.3.2.  Ref . . . . . . . . . . . . . . . . . . . . . . . . .  14
       3.3.3.  Type  . . . . . . . . . . . . . . . . . . . . . . . .  15
       3.3.4.  Enum  . . . . . . . . . . . . . . . . . . . . . . . .  18
       3.3.5.  Elements  . . . . . . . . . . . . . . . . . . . . . .  18
       3.3.6.  Properties  . . . . . . . . . . . . . . . . . . . . .  19
       3.3.7.  Values  . . . . . . . . . . . . . . . . . . . . . . .  22
       3.3.8.  Discriminator . . . . . . . . . . . . . . . . . . . .  23
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  26
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  27
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  27
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .  27
     6.2.  Informative References  . . . . . . . . . . . . . . . . .  28
   Appendix A.  Comparison with CDDL . . . . . . . . . . . . . . . .  28
   Appendix B.  Examples . . . . . . . . . . . . . . . . . . . . . .  30
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  31
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  31

1.  Introduction

   This document describes a schema language for JSON [RFC8259] called
   JSON Data Definition Format (JDDF).  The name JDDF is chosen to avoid
   confusion with "JSON Schema" from [I-D.handrews-json-schema].

   There exist many options for describing JSON data.  JDDF's niche is
   to focus on enabling code generation from schemas; to this end,
   JDDF's expressiveness is intentionally limited to be no more powerful
   than what can be expressed in the type systems of mainstream
   languages.

   The goals of JDDF are to:

   o  Provide an unambiguous description of the overall structure of a
      JSON document.

   o  Be able to describe common JSON datatypes and structures.

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   o  Provide a single format that is readable and editable by both
      humans and machines, and which can be embedded within other JSON
      documents.

   o  Enable code generation from JDDF schemas.