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Internet Engineering Task Force                             D. Oskarsson
Internet-Draft                                                 JSOND.org
Intended status: Informational                             March 9, 2015
Expires: August 5, 2015

            JavaScript Object Notation Definition (JSOND)



   JSOND (JSON Definition) is a simple, yet powerful, definition
   language for JSON text.

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
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 5, 2015.

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   Copyright (c) 2015 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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1.  Introduction

   JSOND (JSON Definition) is a simple, yet powerful, definition
   language for JSON text.

   The purpose of JSOND is to facilitate development and documentation
   of JSON text.

   JSOND is designed to be a minimal superset of JSON.

1.1.  Conventions Used in This Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   document are to be interpreted as described in RFC 2119 [RFC2119].
2.  JSOND Grammar

   JSOND text is JSON text that MAY include JSOND grammar. JSOND
   grammar is a superset of JSON grammar [RFC7159] [RFC4627]
   [ECMA-404].  The rest of this document describes the JSOND grammar
   in ABNF [RFC5234] and text.

2.1.  Values

   A JSOND value MUST be an object, array or a string.

      value = object / array / string

2.2.  Objects

   A JSOND object MUST define all members in the corresponding JSON
   object.  A JSON object MUST NOT contain a member that has not been
   defined in the corresponding JSOND object.

      value = object                           ; e.g. { "a": "string" }

2.3.  Arrays

   A JSOND array defines zero or more values.  All values in a JSON
   array MUST be defined by at least one of the values in the
   corresponding JSOND array.

      value = array                            ; e.g. [ "string" ]

2.4.  Booleans

   A JSOND boolean defines that the corresponding JSON value MUST be
   true or false.

      value = %x22.62.6f.6f.6c.65.61.6e.22     ; "boolean"

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2.5.  Strings

   A JSOND string defines that the corresponding JSON value MUST be any

      value = %x22.        ; "string"

   Regular expressions [ECMA-262] MAY be used to define a subset of

      value = %x22 regular-expression %x22     ; e.g. "[a-z]"

2.4.  Numbers and Integers

   A JSOND number defines that the corresponding JSON value MUST be any

      value = %x22.6e.75.6d.        ; "number"

   A JSOND integer defines that the corresponding JSON value MUST be
   any integer.

      value = %x22.69.6e.     ; "integer"

2.4.1  Sets and Intervals

   An arbitrary number of mathematical sets and intervals [ISO-80000-2]
   MAY be used to define a subset of numbers.

   A corresponding JSON number MUST match a number in the defined

      begin-exclusive = %x28                   ; (

      end-exclusive = %x29                     ; )

      integer = [ minus ] zero / ( digit1-9 *DIGIT )

      number = integer [ frac ] [ exp ]

      set = begin-object number *( value-separator number ) end-object

      interval = begin-array / begin-exclusive ( ( number
      value-separator ) / ( number value-separator number ) /
      ( value-separator number ) ) end-array / end-exclusive

      value = %x22 1*( set / interval ) %x22   ; e.g. "[1.0,2.0)"

   Set elements SHOULD be ordered in increasing order from the least
   to the greatest element.  There must be at least one element.

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   The left or right interval endpoint is OPTIONAL.  An undefined left
   endpoint defines negative infinity.  An undefined right endpoint
   defines positive infinity.  If both endpoints are provided the left
   endpoint MUST be less than the right endpoint.

   An interval that is declared using integers defines the
   corresponding subset of integers.  An interval MUST be declared using
   at least one number with an explicit decimal component to define a
   subset of real numbers.  The decimal component MAY be .0.

   Insignificant whitespace is OPTIONAL in sets and intervals.

2.5.  References

   Any JSOND value MAY be persisted as a file.  A file SHOULD be
   referenced using a relative path, an absolute path, or using the
   http or https scheme [RFC3986].

   value = %x22 [ scheme ] path %x22           ; e.g. "file.jsond"

   JSOND files SHOULD have the filename extension .jsond.  Circular
   references SHOULD be avoided.

2.6.  Constants

   A value that is not valid JSOND grammar SHOULD be interpreted as a
   constant and thus REQUIRED in the corresponding JSON text.

   The literals, true, false, and null are not valid JSOND grammar.
   Numbers are not valid JSOND grammar.

   Most strings are valid regular expressions and thus valid JSOND
   grammar.  String constants SHOULD include boundary matchers.

2.7.  Optionals

   A member can be defined as optional by appending a question mark to
   the end of the name.

      name = %x22 *char [ %x3f ] %x22          ; e.g. "name?"

   An optional member MAY have the value null.  An optional member MAY
   be undefined in JSON text.

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3.  IANA Considerations

   Additional information:
      Magic number(s): n/a
      File extension(s): .jsond
      Macintosh file type code(s): TEXT

4.  Security Considerations

   See Security Considerations in [RFC7159] Section 12.

5.  References

5.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC3986]  Berners-Lee, T., Fielding R., and Masinter, L., "Uniform
              Resource Identifier (URI): Generic Syntax", RFC 3986,
              January 2005.

   [RFC5234]  Crocker, D. and P. Overell, "Augmented BNF for Syntax
              Specifications: ABNF", STD 68, RFC 5234, January 2008.

   [RFC7159]  Bray, T., "The JavaScript Object Notation (JSON) Data
              Interchange Format", RFC 7159, March 2014.

5.2.  Informative References

   [ECMA-404] Ecma International, "The JSON Data Interchange Format",
              Standard ECMA-404, October 2013, <http://www.ecma-

   [ECMA-262] Ecma International, "ECMAScript Language Specification",
              Standard ECMA-262, June 2011, <http://www.ecma-

   [ISO-80000-2] International Organization for Standardization,
                 "Quantities and units - Part 2: Mathematical signs and
                 symbols to be used in the natural sciences and
                 technology", Standard ISO 80000-2:2009, December 2009,

   [RFC4627]  Crockford, D., "The application/json Media Type for
              JavaScript Object Notation (JSON)", RFC 4627, July 2006.

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Appendix A.  Examples

   Example 1:

         "id": "integer",
         "slug": "string",
         "url": "string"
         "category": "integer",
         "price": "number",
         "reduced": "boolean",

   Example 2:

         "id": "[0,)",
         "slug": "[a-z0-9]",
         "url": "url.jsond"
         "category": "{10,25,50}",
         "price": "(0.0,)",
         "reduced?": "boolean",
         "margin": "(high|medium|low)",
         "available": true,

Author's Address

   Daniel Oskarsson
   Satuna Vekabacken
   SE-541 94

   Email: daniel@jsond.org

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