JSON Schema: A Media Type for Describing JSON Documents
draft-handrews-json-schema-00

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Internet Engineering Task Force                           A. Wright, Ed.
Internet-Draft
Intended status: Informational                           H. Andrews, Ed.
Expires: May 23, 2018                                   Cloudflare, Inc.
                                                       November 19, 2017

        JSON Schema: A Media Type for Describing JSON Documents
                     draft-handrews-json-schema-00

Abstract

   JSON Schema defines the media type "application/schema+json", a JSON-
   based format for describing the structure of JSON data.  JSON Schema
   asserts what a JSON document must look like, ways to extract
   information from it, and how to interact with it.  The "application/
   schema-instance+json" media type provides additional feature-rich
   integration with "application/schema+json" beyond what can be offered
   for "application/json" documents.

Note to Readers

   The issues list for this draft can be found at <https://github.com/
   json-schema-org/json-schema-spec/issues>.

   For additional information, see <http://json-schema.org/>.

   To provide feedback, use this issue tracker, the communication
   methods listed on the homepage, or email the document editors.

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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   This Internet-Draft will expire on May 23, 2018.

Wright & Andrews          Expires May 23, 2018                  [Page 1]
Internet-Draft                 JSON Schema                 November 2017

Copyright Notice

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions and Terminology . . . . . . . . . . . . . . . . .   3
   3.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Validation  . . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Hypermedia and Linking  . . . . . . . . . . . . . . . . .   4
   4.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  JSON Document . . . . . . . . . . . . . . . . . . . . . .   4
     4.2.  Instance  . . . . . . . . . . . . . . . . . . . . . . . .   4
       4.2.1.  Instance Data Model . . . . . . . . . . . . . . . . .   4
       4.2.2.  Instance Media Types  . . . . . . . . . . . . . . . .   5
       4.2.3.  Instance Equality . . . . . . . . . . . . . . . . . .   6
     4.3.  JSON Schema Documents . . . . . . . . . . . . . . . . . .   6
       4.3.1.  JSON Schema Values and Keywords . . . . . . . . . . .   7
       4.3.2.  JSON Schema Vocabularies  . . . . . . . . . . . . . .   7
       4.3.3.  Root Schema and Subschemas  . . . . . . . . . . . . .   8
   5.  Fragment Identifiers  . . . . . . . . . . . . . . . . . . . .   8
   6.  General Considerations  . . . . . . . . . . . . . . . . . . .   9
     6.1.  Range of JSON Values  . . . . . . . . . . . . . . . . . .   9
     6.2.  Programming Language Independence . . . . . . . . . . . .   9
     6.3.  Mathematical Integers . . . . . . . . . . . . . . . . . .   9
     6.4.  Extending JSON Schema . . . . . . . . . . . . . . . . . .  10
   7.  The "$schema" Keyword . . . . . . . . . . . . . . . . . . . .  10
   8.  Schema References With "$ref" . . . . . . . . . . . . . . . .  11
   9.  Base URI and Dereferencing  . . . . . . . . . . . . . . . . .  11
     9.1.  Initial Base URI  . . . . . . . . . . . . . . . . . . . .  11
     9.2.  The "$id" Keyword . . . . . . . . . . . . . . . . . . . .  11
       9.2.1.  Internal References . . . . . . . . . . . . . . . . .  13
       9.2.2.  External References . . . . . . . . . . . . . . . . .  14
   10. Comments With "$comment"  . . . . . . . . . . . . . . . . . .  14
   11. Usage for Hypermedia  . . . . . . . . . . . . . . . . . . . .  14