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Network Working Group P. Saint-Andre
Internet-Draft XSF
Intended status: Standards Track May 27, 2008
Expires: November 28, 2008
Atom Link Relation: Discuss
draft-saintandre-atomlink-discuss-00
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Abstract
This specification defines a link relation that enables an Atom
document to point to a venue for multi-party discussion of the
document or its primary topic.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Notational Conventions . . . . . . . . . . . . . . . . . . . . 3
3. The 'discuss' Link Relation . . . . . . . . . . . . . . . . . . 3
4. Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
5. Security Considerations . . . . . . . . . . . . . . . . . . . . 5
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 6
7.1. Normative References . . . . . . . . . . . . . . . . . . . 6
7.2. Informative References . . . . . . . . . . . . . . . . . . 6
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 7
Intellectual Property and Copyright Statements . . . . . . . . . . 8
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1. Introduction
Atom [ATOM] is an XML-based document format that describes lists of
related information known as "feeds". Feeds are composed of a number
of items, known as "entries", each with an extensible set of attached
metadata. Such metadata can include links to other resources, which
are primarily defined by Uniform Resource Indentifiers [URI] or
Internationalized Resource Indentifiers [IRI]. A link can be
secondarily defined as partaking in a specific kind of relationship
to the document. This specification defines a new link relation,
"discuss", which can be used to point to Internet resources where a
person can actively engage in a multi-party discussion or
conversation about the document itself or the primary topic covered
by the document.
2. Notational 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 [TERMS].
This specification allows the use of Internationalized Resource
Identifiers [IRI]. Every Uniform Resource Identifier [URI] is also
an IRI, so a URI may be used wherever an IRI is named. When an IRI
that is not also a URI is given for dereferencing, it MUST be mapped
to a URI using the steps in Section 3.1 of [URI]. When an IRI is
serving as an identifier, it MUST NOT be so mapped.
3. The 'discuss' Link Relation
An Atom link element with a rel attribute value of "discuss" is used
to reference an Internet resource where multi-party discussion of the
feed, entry, or source can occur. In the terminology of this
specification, such a resource is called a "venue". Such venues
might include, but are not limited to, the following:
o Electronic mail discussion lists
o Network news discussion boards (see [NNTP])
o Internet Relay Chat channels (see [IRC])
o Web-based forums accessible via the Hypertext Transport Protocol
(see [HTTP])
o Multi-user chat rooms based on the Extensible Messaging and
Presence Protocol (see [MUC] and [XMPP])
o Multi-user chat rooms based on the Message Session Relay Protocol
(see [MSRP])
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o Voice or video conference rooms based on the Session Initiation
Protocol (see [SIP])
The use of the "discuss" relation enables a person who receives an
Atom feed or entry to discover a venue where the person can engage in
a conversation about the feed or entry with interested others. This
use case is not currently addressed by any existing Atom link
relation, which to date address use cases such as reading background
material (the "related" relation) or following other people's
comments (the "comments" relation) rather than actively engaging in a
conversation or discussion about the feed or entry.
It is expected that a link relation of type "discuss" would be
presented to a human user in such a way that the user would
understand that following the link would result in joining an active
discussion venue rather than accessing a static resource.
If the rel attribute has a value of "discuss" but the type attribute
of the atom:link is omitted, no type value shall be assumed.
Although Atom feed, entry, and source elements MAY each contain any
number of atom:link elements using the "discuss" link relation, this
specification assigns no significance to the presence or order of
such links. Multiple discuss links appearing within an atom:entry
may reference alternative representations of the same venue or may
reference entirely distinct venues containing distinct conversations.
Processors MUST NOT assume that multiple discuss links make reference
to different representations of the same venue and MUST process each
discuss link independently of any others.
4. Example
The following example shows an Atom entry that contains numerous
links related to the ejabberd XMPP server project, including links to
an XMPP chatroom, an email discussion list, a web forum, and two web
pages with background information.
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<entry xmlns='http://www.w3.org/2005/Atom'>
<source>
<title>Example.org Admin Feed</title>
<link href='http://example.org/'/>
<link rel='self'
type='application/atom+xml'
href='http://example.org/atom.xml'/>
<id>tag:example.org,2008:home</id>
<updated>2008-05-27T17:30:03Z</updated>
<author>
<name>Example.org Admin Team</name>
</author>
</source>
<title>Service Upgrade</title>
<summary>We have upgraded to ejabberd 2.0</summary>
<link rel='alternate'
type='text/html'
href='http://example.org/2008/05/27/atom03'/>
<link rel='discuss'
href='xmpp:ejabberd@conference.jabber.ru?join'
label='Real-time chatroom about ejabberd'/>
<link rel='discuss'
href='mailto:ejabberd@jabber.ru'
label='Email discussion list about ejabberd'/>
<link rel='discuss'
href='http://www.ejabberd.im/forum'
label='Web forum about ejabberd'/>
<link rel='related'
href='http://ejabberd.im/'
label='Project homepage for ejabberd'/>
<link rel='related'
href='http://en.wikipedia.org/wiki/Ejabberd'
label='Wikipedia page about ejabberd'/>
<id>tag:example.org,2008:entry-32397</id>
<published>2008-05-27T17:30:03Z</published>
<updated>2008-05-27T17:30:03Z</updated>
</entry>
Notice that the entry contains three links of type "relation" (which
can be differentiated via the URI scheme, i.e., "xmpp" vs. "mailto"
vs. http") and three links to HTTP resources (which can be
differentiated via the relation type, i.e., "discuss" vs. "related").
5. Security Considerations
This document introduces few additional security considerations
beyond those associated with the use and resolution of URIs/IRIs in
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general.
However, depending on the technology used and the local service
policy at a particular installation, a venue for multi-party
discussion may expose personally-identifying information about the
participants (e.g., IP addresses), may be public in the sense that
anyone can join the venue, and may archive the conversations that
occur in the venue either privately or publicly (e.g., on the World
Wide Web). An Atom user agent or the appropriate helper application
should warn a human user about the possibility of information
exposure and public archiving.
6. IANA Considerations
This specification defines one new Atom link relation type, which
shall be registered in the IANA Registry of Atom Link Relations, as
defined by [ATOM].
Attribute value: discuss
Description: (see Section 3)
Expected display characteristics: (see Section 3)
Security considerations: (see Section 5)
7. References
7.1. Normative References
[ATOM] Nottingham, M. and R. Sayre, "The Atom Syndication Format",
RFC 4287, December 2005.
[IRI] Duerst, M. and M. Suignard, "Internationalized Resource
Identifiers (IRIs)", RFC 3987, January 2005.
[TERMS] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[URI] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
Resource Identifier (URI): Generic Syntax", STD 66,
RFC 3986, January 2005.
7.2. Informative References
[HTTP] Fielding, R., Gettys, J., Mogul, J., Frystyk, H., Masinter,
L., Leach, P., and T. Berners-Lee, "Hypertext Transfer
Protocol -- HTTP/1.1", RFC 2616, June 1999.
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[IRC] Oikarinen, J. and D. Reed, "Internet Relay Chat Protocol",
RFC 1459, May 1993.
[MSRP] Campbell, B., Mahy, R., and C. Jennings, "The Message
Session Relay Protocol (MSRP)", RFC 4975, September 2007.
[MUC] Saint-Andre, P., "Multi-User Chat", XSF XEP 0045,
April 2007.
[NNTP] Kantor, B. and P. Lapsley, "Network News Transfer Protocol",
RFC 977, February 1986.
[SIP] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, A.,
Peterson, J., Sparks, R., Handley, M., and E. Schooler,
"SIP: Session Initiation Protocol", RFC 3261, June 2002.
[XMPP] Saint-Andre, P., "Extensible Messaging and Presence Protocol
(XMPP): Core", RFC 3920, October 2004.
Author's Address
Peter Saint-Andre
XMPP Standards Foundation
P.O. Box 1641
Denver, CO 80201
USA
Email: stpeter@jabber.org
URI: xmpp:stpeter@jabber.org
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