mirror of
https://github.com/moparisthebest/xeps
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126 lines
4.7 KiB
XML
126 lines
4.7 KiB
XML
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<?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>Message Replies</title>
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<abstract>
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This document defines a way to indicate that a message is a reply to a previous message.
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</abstract>
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&LEGALNOTICE;
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<number>xxxx</number>
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<status>ProtoXEP</status>
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<type>Standards Track</type>
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<sig>Standards</sig>
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<dependencies/>
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<supersedes/>
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<supersededby/>
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<shortname>reply</shortname>
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<author>
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<firstname>Natalie</firstname>
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<surname>Wirth</surname>
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<email>nataliew@laposte.net</email>
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</author>
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<author>
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<firstname>Marvin</firstname>
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<surname>Wissfeld</surname>
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<email>xsf@larma.de</email>
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<jid>jabber@larma.de</jid>
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</author>
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<revision>
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<version>0.0.1</version>
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<date>2022-01-01</date>
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<initials>nw/mw</initials>
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<remark>
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<p>First draft.</p>
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</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>
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When commenting on a previous message, it is sometimes desired to clarify which message the comment refers to.
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Currently, &xep0393; quotes are commonly used for that purpose. However, this format does not allow receiving
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clients to properly identify the referenced message or to adjust the user interface accordingly.
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</p>
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<p>
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This specification defines a way to indicate that a message is a reply to a previous message. It does not intend
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to provide means to create sub-threads for a message.
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</p>
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</section1>
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<section1 topic='Use Cases' anchor='usecases'>
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<p>
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To indicate that a message is a reply, a <reply> element in the urn:xmpp:reply:0 namespace is placed in the
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message stanza. The <reply> element has a 'to' attribute containing the full jid of the author of the
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referenced message and an 'id' attribute containing the id of the referenced message.
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</p>
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<example caption="Max replies to Anna's message"><![CDATA[
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<message to='max@example.com' from='anna@example.com/tablet' id='message-id1' type='chat'>
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<body>We should bake a cake</body>
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</message>
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<message to='anna@example.com' id='message-id2' type='chat'>
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<body>Great idea!</body>
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<reply to='anna@example.com/tablet' id='message-id1' xmlns='urn:xmpp:reply:0' />
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</message>]]></example>
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<section2 topic='Compatibility Fallback' anchor='compat'>
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<p>
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To provide a fallback for non-supporting clients, the sending client MAY include fallback text in the body and
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indicate it via Compatibility Fallback.
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</p>
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<example caption="Anna replies to a message and includes a fallback"><![CDATA[
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<message to='anna@example.com' id='message-id3' type='chat'>
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<body>
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> Anna wrote:
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> We should bake a cake
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Great idea!
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</body>
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<reply to='anna@example.com/laptop' id='message-id1' xmlns='urn:xmpp:reply:0' />
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<fallback xmlns='urn:xmpp:feature-fallback:0' for='urn:xmpp:reply:0'>
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<body start="0" end="36" />
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</fallback>
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</message>]]></example>
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<p>
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The receiving client SHOULD NOT display the compatibility fallback if it renders the referenced message
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alongside the reply in some way. However, if the receiving client does not display the referenced message, for
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example because it doesn't know the referenced id, it MAY display the compatibility fallback instead.
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</p>
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</section2>
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</section1>
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<section1 topic='Business Rules' anchor='rules'>
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<p>Answers MUST NOT be be assumed to relate to any other messages than the referenced one.</p>
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<section2 topic='Using the correct ID' anchor='business-id'>
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<p>
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For messages of type 'groupchat', the stanza's 'id' attribute MUST NOT be used for replies. Instead, in group
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chat situations, the ID assigned to the stanza by the group chat itself must be used. This is discovered in a
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<stanza-id> element with a 'by' attribute that matches the bare JID of the group chat, as defined
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in &xep0359;.
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</p>
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<p>
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This implies that group chat messages without a &xep0359; stanza-id cannot be replied to.
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</p>
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<p>
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For other message types the sender should use the 'id' from a &xep0359;
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<origin-id> if present, or the value of the 'id' attribute on the
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<message> otherwise.
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</p>
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</section2>
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</section1>
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<section1 topic='IANA Considerations' anchor='iana'>
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<p>This document requires no interaction with &IANA;.</p>
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</section1>
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<section1 topic='XMPP Registrar Considerations' anchor='registrar'>
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<p>This document requires no interaction with ®ISTRAR;.</p>
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</section1>
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</xep>
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