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0.1
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xep-0309.xml
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xep-0309.xml
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<title>Service Directories</title>
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<title>Service Directories</title>
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<abstract>This specification shows how to combine and extend a number of existing XMPP protocols for improved sharing of information about XMPP servers.</abstract>
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<abstract>This specification shows how to combine and extend a number of existing XMPP protocols for improved sharing of information about XMPP servers.</abstract>
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&LEGALNOTICE;
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&LEGALNOTICE;
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<number>xxxx</number>
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<number>0309</number>
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<status>Experimental</status>
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<status>Experimental</status>
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<type>Standards Track</type>
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<type>Standards Track</type>
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<sig>Standards</sig>
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<sig>Standards</sig>
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<supersededby/>
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<supersededby/>
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<shortname>NOT_YET_ASSIGNED</shortname>
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<shortname>NOT_YET_ASSIGNED</shortname>
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&stpeter;
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&stpeter;
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<revision>
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<version>0.1</version>
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<date>2012-01-10</date>
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<initials>psa</initials>
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<remark><p>Initial published version.</p></remark>
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</revision>
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<revision>
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<revision>
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<version>0.0.3</version>
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<version>0.0.3</version>
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<date>2012-01-09</date>
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<date>2012-01-09</date>
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<li>A server directory: xmpp.net</li>
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<li>A server directory: xmpp.net</li>
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<li>A public XMPP service: jabber.org</li>
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<li>A public XMPP service: jabber.org</li>
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</ul>
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</ul>
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<p>Note: Although the entity that gathers information for a directory could be a client or a component, here we assume that it is a server ("xmpp.net").</p>
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<p>These two entities use &xep0267;, &xep0030;, and &xep0292; in the following ways.</p>
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<p>These two entities use &xep0267;, &xep0030;, and &xep0292; in the following ways.</p>
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<code><![CDATA[
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<code><![CDATA[
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Directory Server
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Directory Server
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@ -82,7 +89,7 @@ Directory Server
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]]></code>
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]]></code>
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<section2 topic='Server Discovers Directory' anchor='gather-disco'>
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<section2 topic='Server Discovers Directory' anchor='gather-disco'>
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<p>In order to determine the exact identity of the aggregator, the server sends a service discovery information request to the aggregator.</p>
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<p>In order to determine the exact identity of the directory, the server sends a service discovery information request to the directory.</p>
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<example caption='Server Queries Directory'><![CDATA[
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<example caption='Server Queries Directory'><![CDATA[
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<iq type='get'
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<iq type='get'
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from='jabber.org'
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from='jabber.org'
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@ -107,19 +114,19 @@ Directory Server
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</section2>
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</section2>
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<section2 topic='Server Subscribes to Directory' anchor='gather-buddy'>
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<section2 topic='Server Subscribes to Directory' anchor='gather-buddy'>
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<p>If the server wishes to have its information aggregated, it sends a presence subscription request to the aggregator as described in XEP-0267.</p>
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<p>If the server wishes to have its information aggregated, it sends a presence subscription request to the directory as described in XEP-0267.</p>
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<example caption="Server Sends Subscription Request to Directory"><![CDATA[
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<example caption="Server Sends Subscription Request to Directory"><![CDATA[
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<presence from='jabber.org'
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<presence from='jabber.org'
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to='xmpp.net'
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to='xmpp.net'
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type='subscribe'/>
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type='subscribe'/>
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]]></example>
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]]></example>
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<p>Upon receiving such the presence subscription request, the aggregator approves it.</p>
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<p>Upon receiving such the presence subscription request, the directory approves it.</p>
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<example caption="Directory Sends Approval to Server"><![CDATA[
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<example caption="Directory Sends Approval to Server"><![CDATA[
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<presence from='xmpp.net'
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<presence from='xmpp.net'
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to='jabber.org'
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to='jabber.org'
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type='subscribed'/>
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type='subscribed'/>
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]]></example>
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]]></example>
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<p>The aggregator also sends a subscription request to the server.</p>
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<p>The directory also sends a subscription request to the server.</p>
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<example caption="Directory Sends Subscription Request to Server"><![CDATA[
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<example caption="Directory Sends Subscription Request to Server"><![CDATA[
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<presence from='xmpp.net'
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<presence from='xmpp.net'
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to='jabber.org'
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to='jabber.org'
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</section2>
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</section2>
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<section2 topic='Directory Queries Server' anchor='gather-query'>
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<section2 topic='Directory Queries Server' anchor='gather-query'>
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<p>After the subscription handshake has been completed, the aggregator queries the server for information. There are two aspects: service discovery information and vCard information.</p>
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<p>After the subscription handshake has been completed, the directory queries the server for information. There are two aspects: service discovery information and vCard information.</p>
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<section3 topic='Disco Query' anchor='gather-query-disco'>
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<section3 topic='Disco Query' anchor='gather-query-disco'>
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<p>In order to determine the exact identity of the server, the aggregator sends a service discovery information request to the server.</p>
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<p>In order to determine the exact identity of the server, the directory sends a service discovery information request to the server.</p>
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<example caption='Directory Queries Server'><![CDATA[
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<example caption='Directory Queries Server'><![CDATA[
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<iq type='get'
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<iq type='get'
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from='xmpp.net'
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from='xmpp.net'
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]]></example>
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]]></example>
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<p>Note: If the server is a public node on the XMPP network, it includes a service discovery feature of "urn:xmpp:public-server". This feature is defined below.</p>
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<p>Note: If the server is a public node on the XMPP network, it includes a service discovery feature of "urn:xmpp:public-server". This feature is defined below.</p>
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<p>Note: If the server allows &xep0077;, it includes a service discovery feature of "jabber:iq:register". If the server does not allow in-band registration but allows account registration at a website, it includes the registration URL in its vCard as described below.</p>
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<p>Note: If the server allows &xep0077;, it includes a service discovery feature of "jabber:iq:register". If the server does not allow in-band registration but allows account registration at a website, it includes the registration URL in its vCard as described below.</p>
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<p>The foregoing examples show the gathering of disco#info data (identity and supported features). An aggregator MAY also gather disco#items data about components and other services associated with the base XMPP server at a domain.</p>
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<p>The foregoing examples show the gathering of disco#info data (identity and supported features). An directory MAY also gather disco#items data about components and other services associated with the base XMPP server at a domain.</p>
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</section3>
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</section3>
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<section3 topic='vCard Query' anchor='gather-query-vcard'>
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<section3 topic='vCard Query' anchor='gather-query-vcard'>
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<p>In order to gather additional information about the server, the aggregator sends a vCard information request to the server.</p>
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<p>In order to gather additional information about the server, the directory sends a vCard information request to the server.</p>
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<p>Note: Because vCard4 enables the XMPP community to more easily define extensions to vCard (e.g., for registration URLs), it is RECOMMENDED for servers to support &xep0292; in addition to, or instead of, &xep0054;.</p>
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<p>Note: Because vCard4 enables the XMPP community to more easily define extensions to vCard (e.g., for registration URLs), it is RECOMMENDED for servers to support &xep0292; in addition to, or instead of, &xep0054;.</p>
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<example caption="Directory Requests vCard Data from Server"><![CDATA[
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<example caption="Directory Requests vCard Data from Server"><![CDATA[
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<iq from='xmpp.net'
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<iq from='xmpp.net'
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@ -338,9 +345,9 @@ Directory Server
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</section1>
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</section1>
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<section1 topic='Security Considerations' anchor='security'>
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<section1 topic='Security Considerations' anchor='security'>
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<p>Because a network information aggregator does not know about an XMPP server unless the administrator of the server initiates a presence subscription to the aggregator, information leakage is minimized.</p>
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<p>Because a service directory does not know about an XMPP server unless the administrator of the server initiates a presence subscription to the directory, information leakage is minimized.</p>
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<p>Use of the "urn:xmpp:public-server" service discovery feature provides a way for an XMPP server to explicitly indicate that its information is public.</p>
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<p>Use of the "urn:xmpp:public-server" service discovery feature provides a way for an XMPP server to explicitly indicate that its information is public.</p>
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<p>Use of the "directory/server" service discovery identity provides a way for a network information aggregator to explicitly indicate that it aggregates information obtained from XMPP servers that contact it.</p>
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<p>Use of the "directory/server" service discovery identity provides a way for a service directory to explicitly indicate that it gathers service information obtained from XMPP servers that contact it.</p>
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</section1>
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</section1>
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<section1 topic='IANA Considerations' anchor='iana'>
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<section1 topic='IANA Considerations' anchor='iana'>
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<p>The XMPP Registrar shall add this namespace to its registry at &NAMESPACES;.</p>
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<p>The XMPP Registrar shall add this namespace to its registry at &NAMESPACES;.</p>
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</section2>
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</section2>
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<section2 topic='Service Discovery Category/Type' anchor='registrar-discocat'>
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<section2 topic='Service Discovery Category/Type' anchor='registrar-discocat'>
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<p>This document specifies that a network information aggregator is identified by the "directory" category and the "server" type within XMPP Service Discovery.</p>
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<p>This document specifies that a service directory is identified by the "directory" category and the "server" type within XMPP Service Discovery.</p>
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<p>The XMPP Registrar shall add the "server" type to the "directory" category already listed in the registry at &DISCOCATEGORIES;. The registration is as follows.</p>
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<p>The XMPP Registrar shall add the "server" type to the "directory" category already listed in the registry at &DISCOCATEGORIES;. The registration is as follows.</p>
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<code caption='Registry Submission'><![CDATA[
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<code caption='Registry Submission'><![CDATA[
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<category>
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<category>
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