|Network Working Group||A. Brown|
|Intended status: Informational||IBM|
|Expires: May 23, 2010||J. Reschke, Editor|
|November 19, 2009|
Link Relations for Simple Version Navigation
Note: a later version of this document has been published as RFC5829.
This specification defines Atom link relations for navigation between a resource and its versions.
Please send comments to the Atom Syntax mailing list (<http://www.imc.org/atom-syntax/>).
This Internet-Draft is submitted to IETF in full conformance with the provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts.
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”.
The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt.
The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html.
This Internet-Draft will expire on May 23, 2010.
Copyright © 2009 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 the Trust Legal Provisions and are provided without warranty as described in the BSD License.
This specification defines link relations that may be used on a resource that exists in a system that supports versioning to navigate among the different resources available, such as past versions.
Automated agents should take care when these relation crosses administrative domains (e.g., the URI has a different authority than the current document).
All link relations defined in this document will have the following expected display characteristics:
|[RFC4287]||Nottingham, M. and R. Sayre, “The Atom Syndication Format”, RFC 4287, December 2005.|
|[draft-nottingham-http-link-header]||Nottingham, M., “Web Linking”, Internet-Draft draft-nottingham-http-link-header-06 (work in progress), July 2009.|
|[JSR-283]||Day Software, Nuescheler, D., and P. Piegaze, “Content Repository API for Java™ Technology Specification”, Java Specification Request 283, August 2009, <http://www.day.com/specs/jcr/2.0/>.|
|[RFC3253]||Clemm, G., Amsden, J., Ellison, T., Kaler, C., and J. Whitehead, “Versioning Extensions to WebDAV (Web Distributed Authoring and Versioning)”, RFC 3253, March 2002.|
3565 Harbor Blvd
Costa Mesa, California 92626
20 Maguire Road
Lexington, MA 02421
The "Web Linking" specification ([draft-nottingham-http-link-header]) generalizes Atom link relations, and also re-introduces the HTTP "Link" header as a way to expose link relations in HTTP responses. This will make it possible to expose version links independently from a specific vocabulary, be it the Atom Feed Format ([RFC4287]) or WebDAV properties ([RFC3253]).
VERSION-CONTROL /docs/test.txt HTTP/1.1 Host: example.net
HTTP/1.1 200 OK Link: </system/v/84345634/1>; rel=latest-version; anchor=</docs/test.txt> Link: </system/vh/84345634>; rel=version-history; anchor=</docs/test.txt>
(Note that in this case, the anchor parameter is used, as the response to a VERSION-CONTROL request is not a representation of the resource at the Request-URI)
A subsequent HEAD request on that resource could expose the version-history and latest-version relations as well:
HEAD /docs/test.txt HTTP/1.1 Host: example.net
HTTP/1.1 200 OK Content-Type: text/plain; charset=UTF-8 Content-Length: 12345 Link: </system/v/84345634/1>; rel=latest-version Link: </system/vh/84345634>; rel=version-history
After creating more versions, following the latest-version would then expose predecessors of a version:
HEAD /system/v/84345634/3 HTTP/1.1 Host: example.net
HTTP/1.1 200 OK Content-Type: text/plain; charset=UTF-8 Content-Length: 12323 Link: </system/v/84345634/2>; rel=predecessor-version
The content and concepts within are a product of the Content Management Interoperability Services (CMIS) Technical Committee (TC) at OASIS.
All members of the TC have contributed.
Added Geoff Clemm as author.
Renamed link relation "all-versions" to "version-history". Fixed description of "working-resource" relation to state that it appears on a version resource.
Rewrite terminology and link relations using simpler definitions that can reflect versioning approaches different from WebDAV.
Add JCR/WebDAV property table. And reference to Web Linking draft (for now informative) and examples showing use of the Link header.