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Network Working Group                                        M. Amundsen
Internet-Draft                                           August 10, 2011
Expires: February 11, 2012


                 The Item and Collection Link Relations
          draft-amundsen-item-and-collection-link-relations-01

Abstract

   RFC 5988 [RFC5988] standardized a means of indicating the
   relationships between resources on the Web. This specification
   defines a pair of reciprocal link relation types that may be used to
   express the relationship between a collection and its members.

Editorial Note (To be removed by RFC Editor)

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Copyright Notice

   Copyright (c) 2011 IETF Trust and the persons identified as the
   document authors.  All rights reserved.



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

1.  Introduction

   RFC 5988 [RFC5988] standardized a means of indicating the
   relationships between resources on the Web. This specification
   defines a pair of reciprocal link relation types that may be used to
   express the relationship between a collection and its members.

   These link relation types can be applied to a wide range of use cases
   across multiple media types.  For example, the 'collection' and
   'item' link relation types are used in these media types:

   1.  OpenSearch 1.1: see Section 4.5.4.1 of [OpenSearch]

   2.  Maze+XML: see Section 3 of [Maze]

   3.  Collection+JSON: see Section 5 of [CollectionJSON]

2.  Link Relations

   The following link relations are defined.

2.1.  'item'

   When included in a resource which represents a collection, the 'item'
   link relation identifies a target resource that represents a member
   of that collection.

   For example, if a resource represents a catalog of products, that
   same representation may include one or more links to resources which
   represent members of that catalog.

   <html>
   ...
     <h1>Product Group X Listing</h1>
     ...
     <a href="..." rel="item">View Product X001</a>
     <a href="..." rel="item">View Product X002</a>
     ...



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   </html>

   or

   Link: <...>; rel="item"; title="View Product X001"
   Link: <...>; rel="item"; title="View Product X002"

2.2.  'collection'

   When included in a resource which represents a member of a
   collection, the 'collection' link relation identifies a target
   resource that represents a collection of which the context resource
   is a member.

   For example, if a resource represents a single product in a catalog,
   that same representation may include a link to a resource which
   represents a product group to which this single product belongs:

   <a href="..." rel="collection">Return to Product Group X</a>

   or

   Link: <...>; rel="collection"; title="Return to Product Group X"

   Since it is possible that a resource could be a member of multiple
   collections, multiple 'collection' link relations may appear within
   the same representation:

   <a href="..." rel="collection">View other widgets</a>
   <a href="..." rel="collection">View all discontinued items</a>

   The target resource representation need not be restricted to
   representing a list.  It may simply be a document that provides
   details on the collection of which the context resource is a member:

   Link: <...>; rel="collection";
         title="Shakespeare's Collected Works - A History"

3.  IANA Considerations

   IANA is asked to register the 'collection' and 'item' Link Relations
   below as per [RFC5988].

3.1.  'item' Link Relation Registration

   Relation Name:





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      item

   Description:

      The target IRI points to a resource that is a member of the
      collection represented by the context IRI.

   Reference:

      See Section 2

3.2.  'collection' Link Relation Registration

   Relation Name:

      collection

   Description:

      The target IRI points to a resource which represents a collection
      of which the context IRI is a member.

   Reference:

      See Section 2

4.  Security Considerations

   See Section 7 of RFC5988 [RFC5988].

5.  Internationalisation Considerations

   See Section 8 of RFC5988 [RFC5988].

6.  References

6.1.  Normative References

   [RFC5988]         Nottingham, M., "Web Linking", RFC 5988,
                     October 2010.

6.2.  Informative References

   [OpenSearch]      Clinton, D., "Open Search 1.1", Work in Progress ,
                     January 1900, <http://www.opensearch.org/
                     Specifications/OpenSearch/1.1/>.

   [Maze]            Amundsen, M., "Maze+XML - Format", Web Page ,



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                     December 2010,
                     <http://amundsen.com/media-types/maze/format/>.

   [CollectionJSON]  Amundsen, M., "Collection+JSON - Document Format",
                     Web Page , July 2011, <http://amundsen.com/
                     media-types/collection/format/>.

Appendix A.  Acknowledgements

   The author gratefully acknowledges the contributions of Julian
   Reschke and Mykyta Yevstifeyev.

Author's Address

   Mike Amundsen

   EMail: mca@amundsen.com
   URI:   http://amundsen.com

































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