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git-svn-id: file:///home/ksmith/gitmigration/svn/xmpp/trunk@2675 4b5297f7-1745-476d-ba37-a9c6900126ab
131 lines
6.9 KiB
XML
131 lines
6.9 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>The /me Command</title>
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<abstract>This specification defines recommended handling of the /me command in XMPP instant messaging clients.</abstract>
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&LEGALNOTICE;
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<number>0245</number>
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<status>Active</status>
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<type>Informational</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>XMPP IM</spec>
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</dependencies>
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<supersedes/>
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<supersededby/>
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<shortname>N/A</shortname>
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&stpeter;
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<revision>
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<version>1.0</version>
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<date>2009-01-21</date>
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<initials>psa</initials>
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<remark><p>Per a vote of the XMPP Council, advanced specification to Active and changed type from Historical to Informational.</p></remark>
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</revision>
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<revision>
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<version>0.2</version>
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<date>2009-01-08</date>
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<initials>psa</initials>
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<remark><p>Clarified handling of XHTML-IM formatting; added security consideration for multi-user chat rooms.</p></remark>
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</revision>
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<revision>
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<version>0.1</version>
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<date>2008-06-18</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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<version>0.0.1</version>
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<date>2008-06-09</date>
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<initials>psa</initials>
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<remark><p>First draft.</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>Many Jabber/XMPP instant messaging clients provide special processing and presentation of the string "/me " at the beginning of a message body. This specification describes the recommended handling of this "command".</p>
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</section1>
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<section1 topic='Recommended Handling' anchor='handling'>
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<p>The /me command <note>The string "/me " is usually pronounced "slash-me".</note> is a text string that enables a human user to type an action phrase and have it be presented in a special way within an instant messaging client. The text string is followed by a verb or verb phrase, such as "/me laughs" or "/me is logging off now". This command does not result in the generation of any XMPP protocol. Instead, the command is sent as-is (e.g., <body>/me laughs</body>) and the receiving client performs string-matching on the first four characters of the data included in the &BODY; element to determine if the message begins with the string "/me ". If the client finds a match, the receiving client will show the message with a special presentation. It is RECOMMENDED for the client to show the receiving client's understanding of the sender's user name, nickname, or handle <note>On the difference between user names, nicknames, and handles, see &xep0165; and &xep0172;.</note> followed by the verb phrase in italicized text, prepended by the "*" character.</p>
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<p>For example, imagine that the Greek god Atlas is in a chatroom with the other gods and types the following text in his IM client:</p>
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<example caption="A /me Command"><![CDATA[
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/me shrugs in disgust
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]]></example>
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<p>That text will be sent to all the occupants in the chatroom as follows:</p>
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<example caption="XMPP Stanza"><![CDATA[
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<message from='olympians@chat.gods.lit/Atlas'
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to='olympians@chat.gods.lit'
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type='groupchat'>
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<body>/me shrugs in disgust</body>
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</message>
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]]></example>
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<p>Each recipient's client would then show the message with a special presentation, such as:</p>
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<example caption="Presentation of /me Command">
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<span style='margin-left: 5%; font-style: italic; color: green;'>* Atlas shrugs in disgust</span>
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</example>
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<p>If the receiving client does not find a match on the string "/me " in the first four characters of the message body, it SHOULD NOT present the text in a special way. For example, the following message bodies do not match:</p>
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<example caption="Some Non-Commands"><![CDATA[
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<body>/meshrugs in disgust</body>
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<body>/me's disgusted</body>
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<body> /me shrugs in disgust</body>
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<body>"/me shrugs in disgust"</body>
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<body>* Atlas shrugs in disgust</body>
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<body>Why did Atlas say "/me shrugs in disgust"?</body>
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]]></example>
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</section1>
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<section1 topic='Integration With XHTML-IM' anchor='xhtml'>
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<p>&xep0071; describes a method for lightweight formatting of a message body using a subset of XHTML. For example, the stanza shown above might be formatted in the color green, as follows.</p>
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<example caption="XMPP Stanza With XHTML-IM"><![CDATA[
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<message from='olympians@chat.gods.lit/Atlas'
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to='olympians@chat.gods.lit'
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type='groupchat'>
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<body>/me shrugs in disgust</body>
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<html xmlns='http://jabber.org/protocol/xhtml-im'>
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<body xmlns='http://www.w3.org/1999/xhtml'>
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<p style='color:green'>/me shrugs in disgust</p>
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</body>
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</html>
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</message>
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]]></example>
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<p>The XHTML-formatted version of the message MUST NOT modify the "/me " command string (e.g., in this case to something like "* Atlas shrugs in disgust") because the recipient might have a different user name, nickname, or handle on file for the sender.</p>
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</section1>
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<section1 topic='Accessibility Considerations' anchor='access'>
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<p>This specification describes the /me command in terms of visual presentation. A receiving client that presents messages aurally MAY modify its presentation of /me commands and SHOULD at a minimum transform the string "/me " into the user name, nickname, or handle of the sender.</p>
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</section1>
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<section1 topic='Security Considerations' anchor='security'>
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<p>&xep0045; rooms send XMPP presence stanzas when people leave and join the room, and receiving clients typically show these presence changes as the equivalent of in-room messages, such as the following transformation of a presence stanza of type unavailable:</p>
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<example caption="Presentation of In-Room Presence Notification">
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<span style='margin-left: 5%; font-style: italic; color: green;'>*** Atlas has left the room</span>
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</example>
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<p>A sender could attempt to spoof such a leave message by sending an XMPP groupchat message stanza whose body text is "/me has left the room". Although the presentation of presence joins and leaves is determined by the receiving client and therefore such a notification cannot be universally spoofed for all receivers, a client SHOULD differentiate between presence notifications and /me commands (e.g., with different colors and different prepended characters, such as several asterisks for presence notifications and one asterisk for /me commands).</p>
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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 the ®ISTRAR;.</p>
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</section1>
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<section1 topic='Acknowledgements' anchor='ack'>
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<p>Thanks to Dave Cridland, Kevin Smith, and Matthew Wild for their feedback and suggestions.</p>
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</section1>
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</xep>
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