CoRE Link Format
draft-ietf-core-link-format-13

The information below is for an old version of the document
Document Type Active Internet-Draft (core WG)
Last updated 2012-05-23
Replaces draft-shelby-core-link-format
Stream IETF
Intended RFC status Proposed Standard
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Stream WG state Submitted to IESG for Publication
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Document shepherd Carsten Bormann
Shepherd write-up Show (last changed 2012-02-14)
IESG IESG state IESG Evaluation::AD Followup
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Has a DISCUSS. Needs 8 more YES or NO OBJECTION positions to pass.
Responsible AD Barry Leiba
IESG note Carsten Bormann (cabo@tzi.org) is the document shepherd.
Send notices to core-chairs@tools.ietf.org, draft-ietf-core-link-format@tools.ietf.org
CoRE                                                           Z. Shelby
Internet-Draft                                                 Sensinode
Intended status: Standards Track                            May 23, 2012
Expires: November 24, 2012

                            CoRE Link Format
                     draft-ietf-core-link-format-13

Abstract

   This specification defines Web Linking using a link format for use by
   constrained web servers to describe hosted resources, their
   attributes and other relationships between links.  Based on the HTTP
   Link Header field defined in RFC5988, the CoRE Link Format is carried
   as a payload and is assigned an Internet media type.  A well-known
   URI is defined as a default entry-point for requesting the links
   hosted by a server.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   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 November 24, 2012.

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
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of

Shelby                  Expires November 24, 2012               [Page 1]
Internet-Draft              CoRE Link Format                    May 2012

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Web Linking in CoRE  . . . . . . . . . . . . . . . . . . .  3
     1.2.  Use Cases  . . . . . . . . . . . . . . . . . . . . . . . .  4
       1.2.1.  Discovery  . . . . . . . . . . . . . . . . . . . . . .  4
       1.2.2.  Resource Collections . . . . . . . . . . . . . . . . .  5
       1.2.3.  Resource Directory . . . . . . . . . . . . . . . . . .  5
     1.3.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  5
   2.  Link Format  . . . . . . . . . . . . . . . . . . . . . . . . .  6
     2.1.  Target and context URIs  . . . . . . . . . . . . . . . . .  9
     2.2.  Link relations . . . . . . . . . . . . . . . . . . . . . .  9
     2.3.  Use of anchors . . . . . . . . . . . . . . . . . . . . . .  9
   3.  CoRE link attributes . . . . . . . . . . . . . . . . . . . . .  9
     3.1.  Resource type 'rt' attribute . . . . . . . . . . . . . . . 10
     3.2.  Interface description 'if' attribute . . . . . . . . . . . 10
     3.3.  Maximum size estimate 'sz' attribute . . . . . . . . . . . 11
   4.  Well-known Interface . . . . . . . . . . . . . . . . . . . . . 11
     4.1.  Query Filtering  . . . . . . . . . . . . . . . . . . . . . 12
   5.  Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 15
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 16
     7.1.  Well-known 'core' URI  . . . . . . . . . . . . . . . . . . 16
     7.2.  New 'hosts' relation type  . . . . . . . . . . . . . . . . 16
     7.3.  New link-format Internet media type  . . . . . . . . . . . 16
     7.4.  Constrained RESTful Environments (CORE) Parameters
           Registry . . . . . . . . . . . . . . . . . . . . . . . . . 17
   8.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 19
   9.  Changelog  . . . . . . . . . . . . . . . . . . . . . . . . . . 19
   10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 23
     10.1. Normative References . . . . . . . . . . . . . . . . . . . 23
     10.2. Informative References . . . . . . . . . . . . . . . . . . 24
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 25

Shelby                  Expires November 24, 2012               [Page 2]
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