The I-JSON Message Format
draft-ietf-json-i-json-00

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Document Type Active Internet-Draft (json WG)
Author Tim Bray 
Last updated 2014-04-30
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Network Working Group                                       T. Bray, Ed.
Internet-Draft                                       Textuality Services
Intended status: Standards Track                          April 30, 2014
Expires: November 1, 2014

                       The I-JSON Message Format
                       draft-ietf-json-i-json-00

Abstract

   I-JSON is a restricted profile of JSON designed to maximize
   interoperability and increase confidence that software can process it
   successfully with predictable results.

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
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   Internet-Drafts are draft documents valid for a maximum of six months
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on November 1, 2014.

Copyright Notice

   Copyright (c) 2014 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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   (http://trustee.ietf.org/license-info) in effect on the date of
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   2
     1.2.  Requirements Language . . . . . . . . . . . . . . . . . .   2
   2.  I-JSON Messages . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Encoding and Characters . . . . . . . . . . . . . . . . .   3
     2.2.  Numbers . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.3.  Object constraints  . . . . . . . . . . . . . . . . . . .   3
   3.  Software Behavior . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   6.  Normative References  . . . . . . . . . . . . . . . . . . . .   4
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   RFC7159 describes the JSON data interchange format, which is widely
   used in Internet protocols.  For historical reasons, that
   specification allows the use of language idioms and text encoding
   patterns which are likely to lead to interoperability problems and
   software breakage, particularly when a program receiving JSON data
   uses automated software to map it into native programming-language
   structures or database records.  RFC 7149 describes practices which
   may be used to avoid these interoperability problems.

   This document specifies I-JSON, short for "Internet JSON".  The unit
   of definition is the "I-JSON message".  I-JSON messages are also
   "JSON texts" as defined in RFC7159 but with certain extra constraints
   which enforce the good interoperability practices described in that
   specification.

1.1.  Terminology

   The terms "object", "member", "array", "number", "name", and "string"
   in this document are to be interpreted as described in RFC 7159
   [RFC7159].

1.2.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

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2.  I-JSON Messages

   An I-JSON message is a JSON object, as defined by RFC 7159.  This
   allows protocol designers to add new data items to messages, should
   that become necessary, without breaking existing deployments.  In
   other words, it makes a Must-Ignore policy possible.

   When an I-JSON message is transmitted over the Internet, since it is
   a JSON text as defined in RFC 7159, it may be described using the
   Internet Media Type "application/json".  Specifications whose
   messages are specified to be I-JSON messages SHOULD specify the use
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