mirror of https://github.com/moparisthebest/xeps
225 lines
8.2 KiB
XML
225 lines
8.2 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>Reminders</title>
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<abstract>This specification provides a way to set up reminders.</abstract>
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&LEGALNOTICE;
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<number>0435</number>
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<status>Deferred</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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<dependencies>
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<spec>XMPP Core</spec>
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<spec>XEP-0082</spec>
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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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<author>
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<firstname>Marcos</firstname>
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<surname>De Vera Piquero</surname>
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<email>marcos@tenak.net</email>
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<jid>marcos@tenak.net</jid>
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</author>
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<revision>
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<version>0.1.0</version>
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<date>2020-03-31</date>
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<initials>XEP Editor (jsc)</initials>
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<remark>Accepted by vote of Council on 2020-03-04.</remark>
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</revision>
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<revision>
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<version>0.0.1</version>
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<date>2020-02-17</date>
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<initials>mdvp</initials>
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<remark><p>Initial version</p></remark>
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</revision>
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</header>
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<section1 topic='Introduction' anchor='intro'>
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<p>It is sometimes useful, while reading some conversations, to be
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reminded about it at some point in the future. This specification
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proposes a mechanism to allow clients to set up such reminders.</p>
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</section1>
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<!-- <section1 topic='Requirements' anchor='reqs'> -->
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<!-- <p>STRONGLY RECOMMENDED.</p> -->
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<!-- </section1> -->
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<section1 topic='Glossary' anchor='glossary'>
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<dl>
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<di>
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<dt>Reminder</dt>
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<dd>
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An automatically generated message addressed to an entity sent
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at a given time. Its goal is to remind the creating entity
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about something.
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</dd>
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</di>
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</dl>
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</section1>
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<section1 topic='Requirements' anchor='requirements'>
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<p>This protocol requires handling of dates and times, as such it conforms to &xep0082;.</p>
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</section1>
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<section1 topic='Discovering support' anchor='disco'>
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<p>An entity may wish to discover if a service supports the Reminders feature; in order to do so, it sends a service discovery information query to the server..</p>
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<example caption='Client requests information about a server'><![CDATA[
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<iq from='juliet@capulet.net/balcony'
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id='disco1'
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to='capulet.net'
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type='get'>
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<query xmlns='http://jabber.org/protocol/disco#info'/>
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</iq>]]></example>
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<p>If the server supports the Reminders feature, it MUST specify the
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'urn:xmpp:reminders:0' feature in its service discovery information
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features as specified in &xep0030;</p>
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<example caption='Server advertises support for reminders'><![CDATA[
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<iq to='juliet@capulet.net/balcony' id='disco1' from='capulet.net'
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type='result'>
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<query xmlns='http://jabber.org/protocol/disco#info'>
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…
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<feature var='urn:xmpp:reminders:0'/>
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…
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</query>
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</iq>]]></example>
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</section1>
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<section1 topic='Use Cases' anchor='usecases'>
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<p>For end users, this provides a way to be reminded about stuff
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while being in a conversation, without the need to leave it and go
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to some calendar application or similar and create a full event
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there. By setting a reminder, a user will be notified by the server
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at whatever given time the reminder is created with and with
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whatever the description was set for such a reminder.</p>
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<section2 topic='Creating a reminder' anchor='creating'>
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<p>A user wants to create a new reminder. For creating a
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reminder, an entity MUST send an IQ stanza with the 'type'
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attribute with a value of "set" and a direct <reminder/>
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child qualified by the "urn:xmpp:reminders:0" namespace.</p>
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<example caption='User creates a new reminder'><![CDATA[
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<iq from='juliet@capulet.net/balcony'
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to='capulet.net'
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id='abc123'
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type='set'>
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<reminder xmlns='urn:xmpp:reminders:0'>
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<date>2020-02-19T23:41:00Z</date>
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<text xml:lang='en'>Please go sleep before it's too late</text>
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</reminder>
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</iq>]]> </example>
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<example caption='Server acknowledges the reminder creation'><![CDATA[
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<iq id='abc123'
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to='juliet@capulet.net/balcony'
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from='capulet.net'
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type='result'>
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<reminder xmlns='urn:xmpp:reminders:0' id='d414cec2-5369-11ea-9455-8b8d265047d9'>
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<date>2020-02-19T23:41:00Z</date>
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<text xml:lang='en'>Please go sleep before it's too late</text>
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</reminder>
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</iq>]]></example>
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<p>Whenever the reminder's data sent by a client is not complete or
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in an invalid format, the server MUST send an error stanza of type
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'modify' and a 'bad-request' condition.</p>
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<example caption='Server sends a bad-request error response'><![CDATA[
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<iq id='bad1'
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to='capulet.net'
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from='juliet@capulet.net/balcony'
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type='set'>
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<reminder xmlns='urn:xmpp:reminders:0'>
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<date>Tomorrow at noon</date>
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<text xml:lang='en'>Lunch at Romeo's</text>
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</reminder>
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</iq>
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<iq id='bad1'
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to='juliet@capulet.net/balcony'
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from='capulet.net'
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type='error'>
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<error type='modify'>
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<bad-request xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>
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</error>
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</iq>]]></example>
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<p>In the event of a client trying to set a reminder in the
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past, the server MUST send an error stanza of type 'modify' and
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a 'gone' condition.</p>
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<example caption='Server sends a gone error response'><![CDATA[
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<iq id='bad2'
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to='capulet.net'
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from='juliet@capulet.net/balcony'
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type='set'>
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<reminder xmlns='urn:xmpp:reminders:0'>
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<date>2000-01-01T00:00:00Z</date>
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<text xml:lang='en'>New Year's party</text>
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</reminder>
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</iq>
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<iq id='bad2'
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to='juliet@capulet.net/balcony'
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from='capulet.net'
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type='error'>
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<error type='modify'>
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<gone xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>
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</error>
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</iq>]]></example>
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</section2>
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<section2 topic='Server sends a reminder' anchor='send'>
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<p>Whenever the time for a reminder arrives, the server MUST send
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a message with the reminder to the creating entity.</p>
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<example caption='Server sends a reminder'><![CDATA[
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<message from='capulet.net' to='juliet@capulet.net/balcony' id='reminder1'>
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<reminder xmlns='urn:xmpp:reminders:0' id='d414cec2-5369-11ea-9455-8b8d265047d9'>
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<date timezone='UTC'>2020-02-19T23:41:00Z</date>
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<text xml:lang='en'>Please go sleep before it's too late</text>
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</reminder>
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</message>]]></example>
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<p>After sending a reminder, the server MAY choose to delete it
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from its storage.</p>
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</section2>
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<section2 topic='Client cancels a reminder' anchor='cancel'>
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<p>There may be the case where a user wants to cancel an already
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set reminder. To do so, the client MUST send an IQ stanza of
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type 'set' with a 'reminder' child containing the 'id' attribute
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of the reminder to be deleted, without any additional child.</p>
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<example caption='Client deletes a reminder'><![CDATA[
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<iq id='abc2'
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from='juliet@capulet.net/balcony'
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to='capulet.net'
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type='set'>
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<reminder xmlns='urn:xmpp:reminders:0' id='d414cec2-5369-11ea-9455-8b8d265047d9'/>
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</iq>]]></example>
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<example caption='Server acknowledges a reminder deletion'><![CDATA[
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<iq id='abc2'
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to='juliet@capulet.net/balcony'
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from='capulet.net'
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type='result'>
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<reminder xmlns='urn:xmpp:reminders:0' id='d414cec2-5369-11ea-9455-8b8d265047d9'/>
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</iq>]]></example>
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</section2>
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</section1>
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<section1 topic='Internationalization Considerations' anchor='i18n'>
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<p>As stated in the requirements, the 'date' element MUST contain
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a valid &xep0082; DateTime value.</p>
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</section1>
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<section1 topic='Security Considerations' anchor='security'>
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<p>This document introduces no additional security considerations
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above and beyond those defined in the documents on which it
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depends.</p>
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</section1>
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<section1 topic='IANA Considerations' anchor='iana'>
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<p>No interaction with &IANA; is required as a result of this document.</p>
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</section1>
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<section1 topic='XMPP Registrar Considerations' anchor='registrar'>
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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:reminders:0</li>
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</ul>
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<p>Upon advancement of this specification from a status of
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Experimental to a status of Draft, the ®ISTRAR; shall add the
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foregoing namespace to the registry located at &NAMESPACES;, as
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described in Section 4 of &xep0053;.</p>
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</section1>
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<section1 topic='XML Schema' anchor='schema'>
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<p>TODO</p>
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</section1>
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</xep>
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