A Language for Rules Describing JSON Content

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Document Type Active Internet-Draft (individual)
Authors Andrew Newton  , Pete Cordell 
Last updated 2015-10-19
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Network Working Group                                          A. Newton
Internet-Draft                                                      ARIN
Intended status: Standards Track                              P. Cordell
Expires: April 21, 2016                                        Codalogic
                                                        October 19, 2015

              A Language for Rules Describing JSON Content


   This document describes a language for specifying and testing the
   expected content of JSON structures found in JSON-using protocols,
   software, and processes.

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1.  Introduction

   This document describes JSON Content Rules (JCR), a language for
   specifying and testing the interchange of data in JSON [RFC7159]
   format used by computer protocols and processes.  The syntax of JCR
   is not JSON but is "JSON-like", possessing the conciseness and
   utility that has made JSON popular.

1.1.  A First Example: Specifying Content

   The following JSON data describes a JSON object with two members,
   "line-count" and "word-count", each containing an integer.

      { "line-count" : 3426, "word-count" : 27886 }

   This is also JCR that describes a JSON object with a member named
   "line-count" that is an integer that is exactly 3426 and a member
   named "word-count" that is an integer that is exactly 27886.

   For a protocol specification, it is probably more useful to specify
   that each member is any integer and not specific, exact integers:

      { "line-count" : integer, "word-count" : integer }

   Since line counts and word counts should be either zero or a positive
   integer, the specification may be further narrowed:

      { "line-count" : 0.. , "word-count" : 0.. }

1.2.  A Second Example: Testing Content

   Building on the first example, this second example describes the same
   object but with the addition of another member, "file-name".

        "file-name"  : "rfc7159.txt",
        "line-count" : 3426,
        "word-count" : 27886

   The following JCR describes objects like it.

        "file-name"  : string,
        "line-count" : 0..,
        "word-count" : 0..

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   For the purposes of writing a protocol specification, JCR may be
   broken down into named rules to reduce complexity and to enable re-
   use.  The following example takes the JCR from above and rewrites the
   members as named rules.


      fn "file-name"  : string
      lc "line-count" : 0..
      wc "word-count" : 0..

   With each member specified as a named rule, software testers can
   override them locally for specific test cases.  In the following
   example, the named rules are locally overridden for the test case
   where the file name is "rfc4627.txt".

      fn "file-name"  : "rfc4627.txt"
      lc "line-count" : 2102
      wc "word-count" : 16714

   In this example, the protocol specification describes the JSON object
   in general and an implementation overrides the rules for testing
   specific cases.

2.  Overview of the Language

   JCR is composed of rules (as the name suggests).  A collection of
   rules that is processed together is a ruleset.  There are five types
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