A Language for Rules Describing JSON Content
draft-newton-json-content-rules-02

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Author Andrew Newton 
Last updated 2014-08-28
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Network Working Group                                          A. Newton
Internet-Draft                                                      ARIN
Intended status: Standards Track                         August 28, 2014
Expires: March 1, 2015

              A Language for Rules Describing JSON Content
                   draft-newton-json-content-rules-02

Abstract

   This document describes a language useful for documenting the
   expected content of JSON structures found in specifications using
   JSON.

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   This Internet-Draft will expire on March 1, 2015.

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Newton                    Expires March 1, 2015                 [Page 1]
Internet-Draft             JSON Content Rules                August 2014

1.  Introduction

   The goal of this document is to provide a way to document the
   expected content of data expressed in JSON [RFC4627] format.  That
   is, the primary purpose of this document is to specify a means for
   one person to communicate with another person the expected nature of
   a JSON data structure in a method more concise than prose.  The
   programmatic validation of a JSON data structure against content
   rules is a lesser goal of this document, though such a practice is
   useful in both the writing of specifications and the communications
   of programs.

   Unlike JSON Schema, this language is not JSON though the syntax
   described here is "JSON-like" (a comparison with JSON Schema can be
   found in Appendix A and a "real world" example can be found in
   Appendix B).  A specialized syntax is used to reduce the tedium in
   reading and writing rules as the complexity describing allowable
   content is often more involved than most of the actual content.
   Figure 2 is an example of this language describing the JSON of
   Figure 1.

   Example JSON lifted from RFC 4627

   [
       {
          "precision": "zip",
          "Latitude":  37.7668,
          "Longitude": -122.3959,
          "Address":   "",
          "City":      "SAN FRANCISCO",
          "State":     "CA",
          "Zip":       "94107",
          "Country":   "US"
       },
       {
          "precision": "zip",
          "Latitude":  37.371991,
          "Longitude": -122.026020,
          "Address":   "",
          "City":      "SUNNYVALE",
          "State":     "CA",
          "Zip":       "94085",
          "Country":   "US"
       }
   ]

                                 Figure 1

Newton                    Expires March 1, 2015                 [Page 2]
Internet-Draft             JSON Content Rules                August 2014

   Rules describing Figure 1

   root [
       2*2{
           "precision" : string,
           "Latitude" : float,
           "Longitude" : float,
           "Address" : string,
           "City" : string,
           "State" : string,
           "Zip" : string,
           "Country" : string
       }
   ]

                                 Figure 2

   The JSON Content Rules are of five types:

   o  value rules

   o  member rules

   o  array rules

   o  object rules

   o  group rules

   Each rule has two components, a rule name and a rule definition.
   Anywhere in a rule definition where a rule name is allowed, another
   rule definition may be used.

   This is an example of a value rule:

      v1 : integer 0..3

   It specifies a rule named "v1" that has a definition of ": integer
   0..3" (value rule definitions begin with a ':' character).  This
   defines values of type "v1" to be integers in the range 0 to 3
   (minimum value of 0, maximum value of 3).  Value rules can define the
   limits of JSON values, such as stating that numbers must fall into a
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