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Internet Engineering Task Force                            P. Bryan, Ed.
Internet-Draft                                            Salesforce.com
Intended status: Informational                                    K. Zyp
Expires: March 20, 2013                                    SitePen (USA)
                                                      September 16, 2012


                             JSON Reference
                      draft-pbryan-zyp-json-ref-03

Abstract

   JSON Reference allows a JSON value to reference another value in a
   JSON document.

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
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on March 20, 2013.

Copyright Notice

   Copyright (c) 2012 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   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  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   3.  Syntax  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   4.  Resolution  . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   5.  Error Handling  . . . . . . . . . . . . . . . . . . . . . . . . 4
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
   7.  Security Considerations . . . . . . . . . . . . . . . . . . . . 4
   8.  Normative References  . . . . . . . . . . . . . . . . . . . . . 4
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . . . 4
   Appendix B.  Examples . . . . . . . . . . . . . . . . . . . . . . . 5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 5






































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1.  Introduction

   This specification defines a JSON [RFC4627] structure which allows a
   JSON value to reference another value in a JSON document.  This
   provides the basis for transclusion in JSON: the use of a target
   resource as an effective substitute for the reference.


2.  Conventions

   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 [RFC2119].


3.  Syntax

   A JSON Reference is a JSON object, which contains a member named
   "$ref", which has a JSON string value.  Example:

   { "$ref": "http://example.com/example.json#/foo/bar" }

   If a JSON value does not have these characteristics, then it SHOULD
   NOT be interpreted as a JSON Reference.

   The "$ref" string value contains a URI [RFC3986], which identifies
   the location of the JSON value being referenced.  It is an error
   condition if the string value does not conform to URI syntax rules.
   Any members other than "$ref" in a JSON Reference object SHALL be
   ignored.


4.  Resolution

   Resolution of a JSON Reference object SHOULD yield the referenced
   JSON value.  Implementations MAY choose to replace the reference with
   the referenced value.

   If the URI contained in the JSON Reference value is a relative URI,
   then the base URI resolution MUST be calculated according to
   [RFC3986], section 5.2.  Resolution is performed relative to the
   referring document.

   If a URI contains a fragment identifier, then the fragment should be
   resolved per the fragment resolution mechansim of the referrant
   document.  If the representation of the referrant document is JSON,
   then the fragment identifier SHOULD be interpreted as a
   [JSON-Pointer].



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5.  Error Handling

   In the event of an error condition, evaluation of the JSON Reference
   SHOULD fail to complete.


6.  IANA Considerations

   This draft includes no request to IANA.


7.  Security Considerations

   A JSON Reference is not guaranteed to resolve to a JSON value.
   Implementations of this specification SHOULD take appropriate
   precautions.

   Documents containing JSON References can be structured to resolve
   cyclically.  Implementations SHOULD include appropriate checks to
   prevent such structures from resulting in infinite recursion or
   iteration.


8.  Normative References

   [JSON-Pointer]
              Bryan, P., Zyp, K., and M. Nottingham, "JSON Pointer",
              draft-ietf-appsawg-json-pointer-04 (work in progress),
              September 2012.

   [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 L. Masinter, "Uniform
              Resource Identifier (URI): Generic Syntax", STD 66,
              RFC 3986, January 2005.

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


Appendix A.  Acknowledgements

   The following individuals contributed ideas, feedback and wording to
   this specification:

      Bob Aman, Francis Galiegue.




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Appendix B.  Examples

   TBD.


Authors' Addresses

   Paul C. Bryan (editor)
   Salesforce.com

   Phone: +1 604 783 1481
   Email: pbryan@anode.ca


   Kris Zyp
   SitePen (USA)

   Phone: +1 650 968 8787
   Email: kris@sitepen.com
































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