mirror of
https://github.com/moparisthebest/xeps
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git-svn-id: file:///home/ksmith/gitmigration/svn/xmpp/trunk@38 4b5297f7-1745-476d-ba37-a9c6900126ab
396 lines
14 KiB
XML
396 lines
14 KiB
XML
<?xml version='1.0' encoding='UTF-8'?>
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<!DOCTYPE xep SYSTEM 'xep.dtd' [
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<!ENTITY % ents SYSTEM "xep.ent">
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%ents;
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]>
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<?xml-stylesheet type='text/xsl' href='xep.xsl'?>
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<xep>
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<header>
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<title>IQ Query Action Protocol</title>
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<abstract>Standardizes behavior of &IQ; &QUERY; actions for generic query behavior.</abstract>
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&LEGALNOTICE;
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<number>0099</number>
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<status>Deferred</status>
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<type>Standards Track</type>
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<jig>Standards JIG</jig>
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<dependencies>None</dependencies>
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<supersedes>None</supersedes>
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<supersededby>None</supersededby>
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<shortname>Not yet assigned</shortname>
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<author>
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<firstname>Iain</firstname>
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<surname>Shigeoka</surname>
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<email>iain@jivesoftware.com</email>
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<jid>smirk@jabber.com</jid>
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</author>
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<revision>
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<version>0.1</version>
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<date>2003-06-25</date>
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<initials>iss</initials>
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<remark>Initial version.</remark>
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</revision>
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</header>
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<section1 topic='Introduction'>
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<p>There is a need for consistent query behavior amongst XMPP &IQ; protocols. Currently
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each protocol invents it's own, slightly different behavior for conducting
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query behavior to create, read, update, and delete (CRUD) recipient node data. This JEP defines a generic
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query acton protocol to standardize behavior across &IQ; protocols. In addition, we hope
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this standard will make other protocols easier to understand and implement by using a common
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core protocol.</p>
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</section1>
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<section1 topic='&QUERY; Action Protocol'>
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<section2 topic='Description'>
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<p>The existing XMPP core protocol defines
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four &IQ; types (get, set, result, and error). Unfortunately, these
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four types don't include a 'delete' type, and the 'set' type must do double duty for
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'create' and 'update'. Many protocols can benefit from a clear separation of create
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and update paralleling other query languages such as SQL.</p>
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<p>Protocols complying with the &QUERY; action protocol use &IQ; 'set' to initiate
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all request-response interactions. The particular action to be taken MUST be set as an "action" attribute
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in the &IQ; &QUERY; sub-element. The action attribute MUST have a value of 'create', 'read',
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'update', or 'delete'. Responses use the standard &IQ; 'result' and 'error' types.
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For backward compatibility, an &IQ; 'get' query is treated as equivalent to an &IQ; 'set'
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query with action of 'read'. Action protocols may require all or just a subset of these
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actions depending on the desired outcome.</p>
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<p>In addition to the action attribute an optional "strict" attribute may be set in the &IQ; &QUERY;
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sub-element. The only valid values for strict is "true" or "false" (case sensitive).
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The strict behavior of actions causes more errors to be returned which tends to make
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protocols more robust but also more complex. Action protocols MUST define the default value of
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the "strict" attribute in the context of that protocol. In addition, some protocols may
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not wish to allow changing the strict default, so action protocols MUST declare
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whether the strict behavior of the protocol may be set in the &IQ; &QUERY; sub-element.</p>
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</section2>
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<section2 topic='Actions'>
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<table caption='Description of Acceptable &QUERY; Actions'>
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<tr><td>create</td><td>Creates/inserts new data on the recipient node.</td></tr>
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<tr><td>read</td><td>Retrieves data from the recipient node.</td></tr>
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<tr><td>update</td><td>Updates existing data on the recipient node.</td></tr>
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<tr><td>delete</td><td>Deletes existing data on the recipient node.</td></tr>
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</table>
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</section2>
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<section2 topic='Elements'>
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<p>The root element is query which is in a namespace defining the
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protocol in use. The query element MUST have
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an attribute named 'action' with values given in the previous table.</p>
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</section2>
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<section2 topic='Error Codes'>
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<p>The following error codes apply to all action codes.</p>
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<table caption='Error Codes used by Action Protocols'>
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<tr>
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<th>Code</th><th>Text</th><th>Description</th>
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</tr>
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<tr>
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<td>406</td><td>Not Acceptable</td><td>The IQ query contents are not properly formatted for the action protocol.</td>
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</tr>
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<tr>
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<td>503</td><td>Service Unavailable</td><td>The IQ query is sent to a JID that cannot handle the query.</td>
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</tr>
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</table>
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</section2>
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</section1>
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<section1 topic='Create Action'>
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<section2 topic='Description'>
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<p>The create action inserts new data on the recipient node. If the strict attribute is
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'true' the create action fails if colliding data already exists on the recipient node. If the strict
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attribute is false, the create action will insert new data on the recipient node overwriting
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existing colliding data if it exists (e.g. equivalent to update).</p>
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</section2>
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<section2 topic='Error Codes'>
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<table caption='Error Codes used by Create Action'>
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<tr>
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<th>Code</th><th>Text</th><th>Description</th>
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</tr>
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<tr>
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<td>409</td><td>Conflict</td><td>The strict attribute is set to 'true' and colliding data exists on the recipient node.</td>
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</tr>
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</table>
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</section2>
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<section2 topic='Examples'>
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<p>Creating new data on the server using iq:private, and strict actions when no existing data is on the server.</p>
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<example caption='Client Stores New Private Data'><![CDATA[
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SENDER:
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<iq type="set" id="1001">
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<query xmlns="jabber:iq:private" action="create" strict="true">
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<exodus xmlns="exodus:prefs">
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<defaultnick>Hamlet</defaultnick>
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</exodus>
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</query>
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</iq>
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RECIPIENT:
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<iq
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type="result"
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from="hamlet@shakespeare.lit/denmark"
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to="hamlet@shakespeare.lit/denmark"
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id="1001"/>
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]]></example>
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<p>With strict actions enabled, conflict data will cause the create action
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to fail when existing data is on the recipient node. Here we show iq:private, and strict actions with existing data on the server.</p>
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<example caption='Client Stores New Private Data but Conflicts'><![CDATA[
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SENDER:
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<iq type="set" id="1002">
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<query xmlns="jabber:iq:private" action="create" strict="true">
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<exodus xmlns="exodus:prefs">
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<defaultnick>Hamlet</defaultnick>
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</exodus>
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</query>
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</iq>
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RECIPIENT:
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<iq
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type="error"
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from="hamlet@shakespeare.lit/denmark"
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to="hamlet@shakespeare.lit/denmark"
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id="1002">
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<error code="409">Conflict</error>
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<exodus xmlns="exodus:prefs">
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<defaultnick>Hamlet</defaultnick>
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</exodus>
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</query>
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</iq>
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]]></example>
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</section2>
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</section1>
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<section1 topic='Read Action'>
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<section2 topic='Description'>
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<p>The read action retrieves data on the recipient node. If the strict attribute is
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'true' the read action fails if no appropriate data exists on the recipient node. If the strict
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attribute is false, the read action will always return with a 'result', sending an empty
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result in place of a 'not found' error.</p>
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</section2>
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<section2 topic='Error Codes'>
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<table caption='Error Codes used by Create Action'>
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<tr>
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<th>Code</th><th>Text</th><th>Description</th>
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</tr>
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<tr>
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<td>404</td><td>Not found</td><td>The strict attribute is set to 'true' and no matching data exists on the recipient node.</td>
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</tr>
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</table>
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</section2>
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<section2 topic='Examples'>
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<p>Reading data on the server using iq:private, and strict actions when data is on the server.</p>
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<example caption='Client Reads Private Data'><![CDATA[
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SENDER:
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<iq type="set" id="1001">
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<query xmlns="jabber:iq:private" action="read" strict="true">
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<exodus xmlns="exodus:prefs"/>
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<defaultnick>Hamlet</defaultnick>
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</exodus>
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</query>
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</iq>
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RECIPIENT:
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<iq
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type="result"
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from="hamlet@shakespeare.lit/denmark"
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to="hamlet@shakespeare.lit/denmark"
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id="1001">
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<query xmlns="jabber:iq:private" action="read" strict="true">
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<exodus xmlns="exodus:prefs"/>
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<defaultnick>Hamlet</defaultnick>
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</exodus>
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</query>
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</iq>
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]]></example>
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<p>With strict actions enabled, the absence of matching data will cause the read action
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to fail. Here we show iq:private, and strict actions with no matching data on the server.</p>
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<example caption='Client Reads Private Data but Not Found (strict)'><![CDATA[
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SENDER:
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<iq type="set" id="1002">
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<query xmlns="jabber:iq:private" action="read" strict="true">
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<data xmlns="imaginary"/>
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</query>
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</iq>
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RECIPIENT:
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<iq
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type="error"
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from="hamlet@shakespeare.lit/denmark"
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to="hamlet@shakespeare.lit/denmark"
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id="1002">
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<error code="404">Not Found</error>
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<data xmlns="imaginary"/>
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</query>
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</iq>
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]]></example>
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<p>With strict actions disabled, the absence of matching data will cause the read action
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to return an 'empty' result. Here we show iq:private, and strict actions disabled with no matching data
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on the server.</p>
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<example caption='Client Reads Private Data but Not Found (not strict)'><![CDATA[
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SENDER:
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<iq type="set" id="1003">
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<query xmlns="jabber:iq:private" action="read" strict="false">
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<data xmlns="imaginary"/>
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</query>
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</iq>
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RECIPIENT:
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<iq
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type="result"
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from="hamlet@shakespeare.lit/denmark"
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to="hamlet@shakespeare.lit/denmark"
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id="1003">
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<data xmlns="imaginary"/>
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</query>
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</iq>
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]]></example>
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</section2>
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</section1>
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<section1 topic='Update Action'>
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<section2 topic='Description'>
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<p>The update action edits existing data on the recipient node. If the strict attribute is
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'true' the update action fails if matching data does not already exists on the recipient node. If the strict
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attribute is false, the update action will edit existing data, inserting the data on the recipient node
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if necessary.</p>
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</section2>
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<section2 topic='Error Codes'>
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<table caption='Error Codes used by Create Action'>
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<tr>
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<th>Code</th><th>Text</th><th>Description</th>
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</tr>
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<tr>
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<td>404</td><td>Not Found</td><td>The strict attribute is set to 'true' and matching data does NOT already exist on the recipient node.</td>
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</tr>
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</table>
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</section2>
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<section2 topic='Examples'>
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<p>Updating existing new data on the server using iq:private, and strict actions when existing data is on the server.</p>
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<example caption='Client Updates Existing Private Data'><![CDATA[
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SENDER:
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<iq type="set" id="1001">
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<query xmlns="jabber:iq:private" action="update" strict="true">
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<exodus xmlns="exodus:prefs">
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<defaultnick>Hamlet</defaultnick>
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</exodus>
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</query>
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</iq>
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RECIPIENT:
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<iq
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type="result"
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from="hamlet@shakespeare.lit/denmark"
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to="hamlet@shakespeare.lit/denmark"
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id="1001"/>
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]]></example>
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<p>With strict actions enabled, the absence of existing data will cause the update action
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to fail. Here we show iq:private, and strict actions with no existing data on the server.</p>
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<example caption='Client Updates Private Data but None Found'><![CDATA[
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SENDER:
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<iq type="set" id="1002">
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<query xmlns="jabber:iq:private" action="update" strict="true">
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<exodus xmlns="exodus:prefs">
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<defaultnick>Hamlet</defaultnick>
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</exodus>
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</query>
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</iq>
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RECIPIENT:
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<iq
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type="error"
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from="hamlet@shakespeare.lit/denmark"
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to="hamlet@shakespeare.lit/denmark"
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id="1002">
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<error code="404">Not Found</error>
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<exodus xmlns="exodus:prefs">
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<defaultnick>Hamlet</defaultnick>
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</exodus>
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</query>
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</iq>
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]]></example>
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</section2>
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</section1>
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<section1 topic='Delete Action'>
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<section2 topic='Description'>
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<p>The delete action deletes existing data on the recipient node. If the strict attribute is
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'true' the delete action fails if matching data does not already exists on the recipient node. If the strict
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attribute is false, the delete action will delete any existing data on the recipient node (if any) and return
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successful..</p>
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</section2>
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<section2 topic='Error Codes'>
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<table caption='Error Codes used by Create Action'>
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<tr>
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<th>Code</th><th>Text</th><th>Description</th>
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</tr>
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<tr>
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<td>404</td><td>Not Found</td><td>The strict attribute is set to 'true' and matching data does NOT already exist on the recipient node.</td>
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</tr>
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</table>
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</section2>
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<section2 topic='Examples'>
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<p>Deleting existing new data on the server using iq:private, and strict actions when existing data is on the server.</p>
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<example caption='Client Deletes Existing Private Data'><![CDATA[
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SENDER:
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<iq type="set" id="1001">
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<query xmlns="jabber:iq:private" action="delete" strict="true">
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<exodus xmlns="exodus:prefs"/>
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</query>
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</iq>
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RECIPIENT:
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<iq
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type="result"
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from="hamlet@shakespeare.lit/denmark"
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to="hamlet@shakespeare.lit/denmark"
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id="1001"/>
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]]></example>
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<p>With strict actions enabled, the absence of existing data will cause the delete action
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to fail. Here we show iq:private, and strict actions with no existing data on the server.</p>
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<example caption='Client Deletes Private Data but None Found (strict)'><![CDATA[
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SENDER:
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<iq type="set" id="1002">
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<query xmlns="jabber:iq:private" action="delete" strict="true">
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<data xmlns="imaginary"/>
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</query>
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</iq>
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RECIPIENT:
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<iq
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type="error"
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from="hamlet@shakespeare.lit/denmark"
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to="hamlet@shakespeare.lit/denmark"
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id="1002">
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<error code="404">Not Found</error>
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<data xmlns="imaginary"/>
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</query>
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</iq>
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]]></example>
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<p>With strict actions disabled, the absence of existing data will not cause the delete action
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to fail. Here we show iq:private, and strict actions with no existing data on the server.</p>
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<example caption='Client Deletes Private Data but None Found (not strict)'><![CDATA[
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SENDER:
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<iq type="set" id="1003">
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<query xmlns="jabber:iq:private" action="delete" strict="false">
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<data xmlns="imaginary"/>
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</query>
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</iq>
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RECIPIENT:
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<iq
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type="result"
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from="hamlet@shakespeare.lit/denmark"
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to="hamlet@shakespeare.lit/denmark"
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id="1003"/>
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]]></example>
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</section2>
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</section1>
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<section1 topic='Defining an Action Protocol'>
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<section2 topic='Description'>
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<p>In order to define an action protocol that uses the &QUERY; behavior defined in
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this JEP, you must specify the following:</p>
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<ul>
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<li>The actions (create, read, update, delete) supported in the action protocol.</li>
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<li>The matching semantics for determing if data exists/collides.</li>
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<li>The default "strict" attribute ('true' or 'false'). This may be defined for each action
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supported or for all actions supported.</li>
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<li>Whether the "strict" attribute may be set by the user. If the attribute may not be set,
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the strict attribute will always hold the default value.</li>
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</ul>
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</section2>
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</section1>
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</xep>
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