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ProtoXEP

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<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE xep SYSTEM 'xep.dtd' [
<!ENTITY % ents SYSTEM 'xep.ent'>
%ents;
]>
<?xml-stylesheet type='text/xsl' href='xep.xsl'?>
<xep>
<header>
<title>Pubsub Subscription</title>
<abstract>This specification describe a method that allow a user to share a list of nodes on which it is Pubsub registered</abstract>
<legal>
<copyright>This XMPP Extension Protocol is copyright (c) 1999 - 2013 by the XMPP Standards Foundation (XSF).</copyright>
<permissions>Permission is hereby granted, free of charge, to any person obtaining a copy of this specification (the &quot;Specification&quot;), to make use of the Specification without restriction, including without limitation the rights to implement the Specification in a software program, deploy the Specification in a network service, and copy, modify, merge, publish, translate, distribute, sublicense, or sell copies of the Specification, and to permit persons to whom the Specification is furnished to do so, subject to the condition that the foregoing copyright notice and this permission notice shall be included in all copies or substantial portions of the Specification. Unless separate permission is granted, modified works that are redistributed shall not contain misleading information regarding the authors, title, number, or publisher of the Specification, and shall not claim endorsement of the modified works by the authors, any organization or project to which the authors belong, or the XMPP Standards Foundation.</permissions>
<warranty>## NOTE WELL: This Specification is provided on an &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, express or implied, including, without limitation, any warranties or conditions of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. In no event shall the XMPP Standards Foundation or the authors of this Specification be liable for any claim, damages, or other liability, whether in an action of contract, tort, or otherwise, arising from, out of, or in connection with the Specification or the implementation, deployment, or other use of the Specification. ##</warranty>
<liability>In no event and under no legal theory, whether in tort (including negligence), contract, or otherwise, unless required by applicable law (such as deliberate and grossly negligent acts) or agreed to in writing, shall the XMPP Standards Foundation or any author of this Specification be liable for damages, including any direct, indirect, special, incidental, or consequential damages of any character arising out of the use or inability to use the Specification (including but not limited to damages for loss of goodwill, work stoppage, computer failure or malfunction, or any and all other commercial damages or losses), even if the XMPP Standards Foundation or such author has been advised of the possibility of such damages.</liability>
<conformance>This XMPP Extension Protocol has been contributed in full conformance with the XSF's Intellectual Property Rights Policy (a copy of which may be found at &lt;<link url='http://www.xmpp.org/extensions/ipr-policy.shtml'>http://www.xmpp.org/extensions/ipr-policy.shtml</link>&gt; or obtained by writing to XSF, P.O. Box 1641, Denver, CO 80201 USA).</conformance>
</legal>
<number>xxxx</number>
<status>ProtoXEP</status>
<type>Standards Track</type>
<sig>Standards</sig>
<approver>Council</approver>
<dependencies>
<spec>XMPP Core</spec>
<spec>XEP-0001</spec>
<spec>XEP-0163</spec>
<spec>XEP-0060</spec>
</dependencies>
<supersedes/>
<supersededby/>
<shortname>subscription</shortname>
<author>
<firstname>Christine</firstname>
<surname>nodpounod</surname>
<email>nodpounod@gmail.com</email>
<jid>christine.ho.dev@gmail.com</jid>
</author>
<author>
<firstname>Timothée</firstname>
<surname>edhelas</surname>
<email>edhelas@gmail.com</email>
<jid>edhelas@movim.eu</jid>
</author>
<revision>
<version>0.0.1</version>
<date>2013-03-04</date>
<initials>psa</initials>
<remark><p>First draft.</p></remark>
</revision>
</header>
<section1 topic='Introduction' anchor='intro'>
<p>
&xep0060; nodes are commonly used by XMPP users to subscribe to news feeds. This document describe a way, for them, to share some of the nodes to which they have subscribed with other users.
</p>
<p>
The list of &xep0060; subcribed nodes is stored on a classic &xep0163; node qualified by the 'urn:xmpp:subscription' namespace. If an entity wishes to make pubsub subscriptions publicly available then the entity MAY publish them on this node. The entity SHOULD ensure that this information is kept up to date.
</p>
</section1>
<section1 topic='Protocol' anchor='protocol'>
<p>Information about the subscribed node is provided by the user client. The subscription container is defined as a classic <subscription/> element with theses specific constraints :</p>
<table caption='attributes'>
<tr>
<td><strong>Name</strong></td>
<td><strong>Type</strong></td>
<td><strong>Description</strong></td>
<td><strong>Support</strong></td>
</tr>
<tr>
<td>server</td>
<td>attribute</td>
<td>Any server's address</td>
<td>REQUIRED</td>
</tr>
<tr>
<td>node</td>
<td>attribute</td>
<td></td>
<td>REQUIRED</td>
</tr>
<tr>
<td>id</td>
<td>node</td>
<td></td>
<td>RECOMMENDED</td>
</tr>
<tr>
<td>title</td>
<td>node</td>
<td></td>
<td>OPTIONAL</td>
</tr>
</table>
<section2 topic="Item ID generation method">
<p>The aim of this XEP is to handle a list of subscriptions. To simplify the managment of this list the ID of the &xep0060; items MUST be generated according to the following method :</p>
<ol>
<li>Initialize an empty string S</li>
<li>Append the name of the server, followed by the '&lt;' character</li>
<li>Append the name of the node, followed by the '&lt;' character</li>
<li>Append the jid of the current account</li>
<li>Compute the ID by hashing the S string using the SHA1 algorythm</li>
</ol>
<section3 topic="Generation Example">
<ol>
<li>S = ''</li>
<li>S = 'pubsub.montague.lit&lt;'</li>
<li>S = 'pubsub.montague.lit&lt;party'</li>
<li>id = de6c6772ff43d9a604ea78e51ce28b63ab8692eb</li>
</ol>
</section3>
</section2>
</section1>
<section1 topic='Requirements' anchor='reqs'>
<p>The motivations for this document are to :</p>
<ul>
<li>Allow Jabber user's to share their &xep0060; subscriptions</li>
<li>Add a new way to discover &xep0060; nodes</li>
</ul>
</section1>
<section1 topic='Glossary' anchor='glossary'>
<dl>
<di>
<dt>Personnal Eventing</dt>
<dd>A simplified subset of Publish-Subscribe for use in the context of instant messaging and presence applications, whereby each IM user's JID is a virtual pubsub service; for details, see
<link url='http://xmpp.org/extensions/xep-0163.html'>Personal Eventing Protocol</link>.
</dd>
</di>
</dl>
</section1>
<section1 topic='Use Cases' anchor='usecases'>
<section2 topic='Requesting the list of subscription' anchor='usecases'>
<example caption='Requests the list of subscriptions'><![CDATA[
<iq type='get'
from='romeo@montague.lit'
to='pubsub.shakespeare.lit'
id='items1'>
<pubsub xmlns='http://jabber.org/protocol/pubsub'>
<items node='urn:xmpp:pubsub:subscription'/>
</pubsub>
</iq>]]></example>
</section2>
<section2 topic='Adding a subscription to the list' anchor='usecases'>
<example caption='Add a subscription to the list '><![CDATA[
<iq type="set" from="romeo@montague.lit" id="sub123">
<pubsub xmlns="http://jabber.org/protocol/pubsub">
<publish node="urn:xmpp:pubsub:subscription">
<item id="0bc0e76cb803b3b107aa369169d8c0d45086f844">
<subscription xmlns="urn:xmpp:pubsub:subscription:0"
server="pubsub.shakespeare.lit" node="party">
<title>Party at the Capulets</title>
</subscription>
</item>
</publish>
</pubsub>
</iq>
]]>
</example>
</section2>
<section2 topic='Removing a subscription from the list' anchor='usecases'>
<p>
<example caption='Remove a subscription from the list '><![CDATA[
<iq type='set'
from='romeo@montague.lit'
to='pubsub.shakespeare.lit'
id='unsub1'>
<pubsub xmlns='http://jabber.org/protocol/pubsub'>
<retract node='urn:xmpp:pubsub:subscription'>
<item id='0bc0e76cb803b3b107aa369169d8c0d45086f844'/>
</retract>
</pubsub>
</iq>
]]>
</example>
</p>
</section2>
<section2 topic='Modifiying a subscription of the list' anchor='usecases'>
<p>
<example caption='Change the information of a subscription of the list '><![CDATA[
<iq type='set'
from='romeo@montague.lit'
to='pubsub.shakespeare.lit'
id='unsub1'>
<pubsub xmlns='http://jabber.org/protocol/pubsub'>
<publish node='urn:xmpp:pubsub:subscription'>
<item id='0bc0e76cb803b3b107aa369169d8c0d45086f844'>
<subscription xmlns='urn:xmpp:pubsub:subscription:0'
server='pubsub.shakespeare.lit' node='party'>
<title>Party at the Capulets [canceled !]</title>
</subscription>
</item>
</publish>
</pubsub>
</iq>
]]>
</example>
</p>
</section2>
</section1>
<section1 topic='Internationalization Considerations' anchor='i18n'>
<p>The title element of a <subscription/> item SHOULD be in the same language as the contents of the node in question.</p>
</section1>
<section1 topic='Security Considerations' anchor='security'>
<p>The publication of user tune information is not known to introduce any new security considerations above and beyond those defined in XEP-0060: Publish-Subscribe.</p>
</section1>
<section1 topic='IANA Considerations' anchor='iana'>
<p>This document requires no interaction with &IANA;.</p>
</section1>
<section1 topic='XMPP Registrar Considerations' anchor='registrar'>
<p>The &REGISTRAR; is requested to issue an initial namespace of "urn:xmpp:pubsub:subscription".</p>
</section1>
<section1 topic='XML Schema' anchor='schema'>
<p>REQUIRED for protocol specifications.</p>
</section1>
</xep>