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0.4
git-svn-id: file:///home/ksmith/gitmigration/svn/xmpp/trunk@2744 4b5297f7-1745-476d-ba37-a9c6900126ab
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Peter Saint-Andre
parent
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116
xep-0215.xml
116
xep-0215.xml
@ -10,7 +10,7 @@
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<abstract>This document specifies an XMPP protocol extension for discovering services external to the XMPP network.</abstract>
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&LEGALNOTICE;
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<number>0215</number>
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<status>Deferred</status>
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<status>Experimental</status>
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<type>Standards Track</type>
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<sig>Standards</sig>
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<approver>Council</approver>
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@ -19,9 +19,21 @@
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</dependencies>
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<supersedes/>
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<supersededby/>
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<shortname>NOT YET ASSIGNED</shortname>
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<shortname>extdisco</shortname>
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&stpeter;
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&seanegan;
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<author>
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<firstname>Marcus</firstname>
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<surname>Lundblad</surname>
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<email>ml@update.uu.se</email>
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<jid>mlundblad@jabber.org</jid>
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</author>
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<revision>
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<version>0.4</version>
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<date>2009-02-17</date>
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<initials>psa/ml</initials>
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<remark><p>Revived the spec by popular demand; updated namespace to use XMPP URN; defined registry process and several initial entries.</p></remark>
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</revision>
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<revision>
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<version>0.3</version>
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<date>2007-08-30</date>
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@ -92,7 +104,7 @@
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</section1>
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<section1 topic='Protocol' anchor='protocol'>
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<p>In order to learn about external services known to an XMPP server or discovery service, a requesting entity (typically a client) sends an IQ-get containing an empty <services/> element qualified by the 'http://www.xmpp.org/extensions/xep-0215.html#ns' namespace &NSNOTE;, typically to its own server but perhaps alternatively to a dedicated discovery service.</p>
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<p>In order to learn about external services known to an XMPP server or discovery service, a requesting entity (typically a client) sends an IQ-get containing an empty <services/> element qualified by the 'urn:xmpp:extdisco:0' namespace &NSNOTE;, typically to its own server but perhaps alternatively to a dedicated discovery service.</p>
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<p>The responding entity (XMPP server or discovery service) SHOULD return the list of external services it is aware of, but MAY instead return an appropriate error, such as &unavailable; if the responding entity does not support this protocol or &forbidden; if the requesting entity does not have permission to receive the list of external services. Each service is encapsulated via a <service/> element.</p>
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<p>Note: The processes by which a responding entity discovers external services for "proxying" to XMPP entities are out of scope for this specification.</p>
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<p>The <service/> element MAY be empty or MAY include extended information about the service as described in the <link url='#extended'>Extended Information</link> section of this document.</p>
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@ -150,7 +162,7 @@
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from='bard@shakespeare.lit/globe'
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to='shakespeare.lit'
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id='all1'>
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<services xmlns='http://www.xmpp.org/extensions/xep-0215.html#ns'/>
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<services xmlns='urn:xmpp:extdisco:0'/>
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</iq>
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]]></example>
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<example caption='XMPP Server Returns List'><![CDATA[
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@ -158,18 +170,26 @@
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from='shakespeare.lit'
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to='bard@shakespeare.lit/globe'
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id='all1'>
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<services xmlns='http://www.xmpp.org/extensions/xep-0215.html#ns'>
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<service host='stun.shakespeare.lit' port='9998' transport='udp' type='stun'/>
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<services xmlns='urn:xmpp:extdisco:0'>
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<service host='stun.shakespeare.lit'
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port='9998'
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transport='udp'
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type='stun'/>
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<service host='relay.shakespeare.lit'
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password='jj929jkj5sadjfj93v3n'
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port='9999'
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type='stun-relay'
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transport='udp'
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type='turn'
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username='nb78932lkjlskjfdb7g8'/>
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<service host='192.0.2.1' port='8888' transport='udp' type='stun'/>
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<service host='192.0.2.1'
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port='8888'
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transport='udp'
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type='stun'/>
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<service host='192.0.2.1'
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port='8889'
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password='93jn3bakj9s832lrjbbz'
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type='stun-relay'
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transport='udp'
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type='turn'
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username='auu98sjl2wk3e9fjdsl7'/>
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<service host='ftp.shakespeare.lit'
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name='Shakespearean File Server'
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@ -189,8 +209,7 @@
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from='bard@shakespeare.lit/globe'
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to='shakespeare.lit'
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id='selected1'>
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<services xmlns='http://www.xmpp.org/extensions/xep-0215.html#ns'
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type='stun-relay'/>
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<services xmlns='urn:xmpp:extdisco:0' type='turn'/>
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</iq>
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]]></example>
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<example caption='XMPP Server Returns List'><![CDATA[
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@ -198,17 +217,19 @@
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from='shakespeare.lit'
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to='bard@shakespeare.lit/globe'
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id='selected1'>
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<services xmlns='http://www.xmpp.org/extensions/xep-0215.html#ns'
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type='stun-relay'>
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<service host='stun.shakespeare.lit'
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<services xmlns='urn:xmpp:extdisco:0'
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type='turn'>
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<service host='turn.shakespeare.lit'
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password='jj929jkj5sadjfj93v3n'
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port='9999'
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type='stun-relay'
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transport='udp'
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type='turn'
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username='nb78932lkjlskjfdb7g8'/>
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<service host='192.0.2.1'
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port='8889'
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password='93jn3bakj9s832lrjbbz'
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type='stun-relay'
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transport='udp'
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type='turn'
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username='auu98sjl2wk3e9fjdsl7'/>
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</services>
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</iq>
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@ -219,14 +240,18 @@
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from='shakespeare.lit'
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to='bard@shakespeare.lit/globe'
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id='push1'>
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<services xmlns='http://www.xmpp.org/extensions/xep-0215.html#ns'
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type='stun-relay'>
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<services xmlns='urn:xmpp:extdisco:0'
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type='type'>
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<server host='stun.shakespeare.lit'
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port='9999'
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transport='udp'
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type='turn'
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username='1nas9dlm3hzl89d0b9v'
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password='gh9023ljjdk109iajqn'>
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<server host='192.0.2.2'
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port='7778'
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transport='udp'
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type='turn'
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username='bnsv120afg48snsdozp'
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password='zxp023na98dsfahn1kk'/>
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</services>
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@ -236,10 +261,10 @@
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</section1>
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<section1 topic='Extended Information' anchor='extended'>
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<p>If a server or service needs to include extended information, it SHOULD do so by including each bit of information as the XML character data of the <value/> child of a distinct <field/> element, with the entire set of fields contained within an <x/> element of type "result" qualified by the 'jabber:x:data' namespace (see &xep0004;); this <x/> element SHOULD be a child of the <service/> element qualified by the 'http://www.xmpp.org/extensions/xep-0215.html#ns' namespace &NSNOTE;. Thus the IQ result SHOULD be of the following form:</p>
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<p>If a server or service needs to include extended information, it SHOULD do so by including each bit of information as the XML character data of the <value/> child of a distinct <field/> element, with the entire set of fields contained within an <x/> element of type "result" qualified by the 'jabber:x:data' namespace (see &xep0004;); this <x/> element SHOULD be a child of the <service/> element qualified by the 'urn:xmpp:extdisco:0' namespace &NSNOTE;. Thus the IQ result SHOULD be of the following form:</p>
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<code><![CDATA[
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<iq type='result'>
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<services xmlns='http://www.xmpp.org/extensions/xep-0215.html#ns'>
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<services xmlns='urn:xmpp:extdisco:0'>
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<service>
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<x type='result' xmlns='jabber:x:data'>
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<field var='[var-name]' label='[optional]'>
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@ -252,11 +277,11 @@
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</iq>]]></code>
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<p>Note: A <field/> element MAY contain more than one <value/> child if appropriate.</p>
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<p>If the data fields are to be used in the context of a protocol approved by the XMPP Standards Foundation, they SHOULD be registered in accordance with the rules defined in XEP-0068, resulting in the inclusion of a <field/> element whose 'var' attribute has a value of "FORM_TYPE" and whose 'type' attribute has a value of "hidden".</p>
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<p>Note: Although &xep0128; specifies that an XMPP entity MUST NOT supply extended information about associated children communicated via the 'http://www.xmpp.org/extensions/xep-0215.html#ns' namespace, that rule does not apply to External Service Discovery since services external to the XMPP network cannot communicate via XMPP.</p>
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<p>Note: Although &xep0128; specifies that an XMPP entity MUST NOT supply extended information about associated children communicated via the 'urn:xmpp:extdisco:0' namespace, that rule does not apply to External Service Discovery since services external to the XMPP network cannot communicate via XMPP.</p>
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</section1>
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<section1 topic='Determining Support' anchor='disco'>
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<p>If an entity supports the STUN Server Discovery protocol, it MUST report that fact by including a service discovery feature of "http://www.xmpp.org/extensions/xep-0215.html#ns" &NSNOTE; in response to a &xep0030; information request:</p>
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<p>If an entity supports the STUN Server Discovery protocol, it MUST report that fact by including a service discovery feature of "urn:xmpp:extdisco:0" &NSNOTE; in response to a &xep0030; information request:</p>
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<example caption="Service Discovery Information Request"><![CDATA[
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<iq type='get'
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from='romeo@montague.lit/orchard'
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@ -271,9 +296,7 @@
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to='romeo@montague.lit/orchard'
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id='disco1'>
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<query xmlns='http://jabber.org/protocol/disco#info'>
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...
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<feature var='http://www.xmpp.org/extensions/xep-0215.html#ns'/>
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...
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<feature var='urn:xmpp:extdisco:0'/>
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</query>
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</iq>
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]]></example>
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@ -288,11 +311,44 @@
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</section1>
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<section1 topic='XMPP Registrar Considerations' anchor='registrar'>
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<section2 topic='Protocol Namespaces' anchor='ns'>
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<p>Until this specification advances to a status of Draft, its associated namespace shall be "http://www.xmpp.org/extensions/xep-0215.html#ns"; upon advancement of this specification, the XMPP Registrar shall issue a permanent namespace in accordance with the process defined in Section 4 of &xep0053;.</p>
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<section2 topic='Protocol Namespaces' anchor='registrar-ns'>
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<p>This specification defines the following XML namespace:</p>
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<ul>
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<li>urn:xmpp:extdisco:1</li>
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</ul>
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<p>Upon advancement of this specification from a status of Experimental to a status of Draft, the ®ISTRAR; shall add the foregoing namespace to the registry located at &NAMESPACES;, as described in Section 4 of &xep0053;.</p>
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</section2>
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<section2 topic='Protocol Versioning' anchor='registrar-versioning'>
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&NSVER;
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</section2>
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<section2 topic='External Service Types Registry' anchor='registrar-services'>
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<p>The XMPP Registrar shall maintain a registry of external service types and their associated transport protocol(s). Such service types will probably be derived from the &ianaports;, defined DNS SRV record types, defined DDDS records for NAPTR, S-NAPTR, and U-NAPTR, and &ianaslp;. A future version of this specification shall define the relevant actions requested of the XMPP Registrar.</p>
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<p>The XMPP Registrar shall maintain a registry of external service types and their associated transport protocol(s). Such service types will probably be derived from the &ianaports;, defined DNS SRV record types, defined DDDS records for NAPTR, S-NAPTR, and U-NAPTR, and &ianaslp;.</p>
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<section3 topic='Process' anchor='registrar-methods-process'>
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®PROCESS;
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<code><![CDATA[
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<service>
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<name>the XML character data of the service type</name>
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<desc>a natural-language description of the service type</desc>
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<doc>the document that best defines the service type</doc>
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</service>
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]]></code>
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<p>The registrant may register more than one service type at a time, each contained in a separate <service/> element.</p>
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</section3>
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<section3 topic='Registration' anchor='registrar-methods-init'>
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<code><![CDATA[
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<service>
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<name>stun</name>
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<desc>a server that provides Session Traversal Utilities for NAT (STUN)</desc>
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<doc>RFC 5389</doc>
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</service>
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<service>
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<name>turn</name>
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<desc>a server that provides Traversal Using Relays around NAT (TURN)</desc>
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<doc>draft-ietf-behave-turn</doc>
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</service>
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]]></code>
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</section3>
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</section2>
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</section1>
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@ -302,8 +358,8 @@
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<xs:schema
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xmlns:xs='http://www.w3.org/2001/XMLSchema'
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targetNamespace='http://www.xmpp.org/extensions/xep-0215.html#ns'
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xmlns='http://www.xmpp.org/extensions/xep-0215.html#ns'
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targetNamespace='urn:xmpp:extdisco:0'
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xmlns='urn:xmpp:extdisco:0'
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elementFormDefault='qualified'>
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<xs:import
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