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Accept XEP-0457 as Active
Approving body is Editor because of the track.
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Jonas Schäfer
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54031a176f
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162
xep-0457.xml
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162
xep-0457.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 Fancying</title>
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<abstract>This specification defines a Unicode-formatted fancy text syntax for use in instant messages.</abstract>
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&LEGALNOTICE;
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<number>0457</number>
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<status>Active</status>
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<type>Humorous</type>
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<sig>None</sig>
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<approver>Editor</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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<spec>XEP-0071</spec>
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<spec>XEP-0393</spec>
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<spec>XEP-0394</spec>
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</supersedes>
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<supersededby/>
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<shortname>fancying</shortname>
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<author>
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<firstname>Georg</firstname>
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<surname>Lukas</surname>
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<email>georg@op-co.de</email>
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<jid>georg@yax.im</jid>
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</author>
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<revision>
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<version>1.0.0</version>
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<date>2021-04-01</date>
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<initials>XEP Editor (jsc)</initials>
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<remark>Initial published version.</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>2021-04-01</date>
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<initials>gl</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>
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XMPP-based Instant Messages has suffered from a lack of proper message
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styling mechanisms. After abandoning &xep0071; for its horrible security
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track record, &xep0393; and &xep0394; were proposed as replacements, but
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neither was able to gain sufficient traction to become the default styling
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mechanism.
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</p>
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<p>
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This specification fills the gap by formally specifying the Unicode-based
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formatting that is currently fancied on Social Media and micro-blogging as
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an XMPP standard for Instant Messaging. As XMPP is based on UTF-8, messages
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formatted with this mechanism are immediately visible on all receiving
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clients. Simple third-party tools can be used for writing messages until
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this specification is integrated into the IM message input boxes.
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</p>
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</section1>
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<section1 topic='Requirements' anchor='reqs'>
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<p>This specification relies on Unicode features introduced in the 3.1
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specification. As XMPP implementations are required to support Unicode 3.2
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for StringPrep during SASL authentication, no new requirements arise.</p>
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</section1>
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<section1 topic='Use Cases' anchor='usecases'>
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<ul>
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<li>
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As a user sending an instant message to a friend, I want to be able to
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emphasize an important part of my message.
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</li>
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<li>
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As a software developer, I want to be able to send code as pre-formatted,
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monospace, block or inline text to another developer.
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</li>
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<li>
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As a user of non-Latin script, I want to be surprised by inconsistent
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transitions and missing range checks resulting in characters from random
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Unicode planes.
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</li>
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<li>
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As a visually impaired user, I want my screen reader to emit long
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sequences of technical names of Unicode special characters to really
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convey the point of the intended emphasis, character by character!
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</li>
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<li>
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As a multi-user chat user I want to add context to my reply by quoting an
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earlier message in the chat.
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</li>
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</ul>
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</section1>
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<section1 topic='Business Rules' anchor='rules'>
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<section2 topic='Preformatted Text' anchor='pre'>
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<p>To format a string as Preformatted Text, the individual code-points need
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to be converted to their integer representation, then increased by
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<tt>0x1D62F</tt> (capital letters) or <tt>0x1D629</tt> (lowercase letters)
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and then converted back to characters.</p>
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<div class='example'>Preformatted text → 𝙿𝚛𝚎𝚏𝚘𝚛𝚖𝚊𝚝𝚝𝚎𝚍 𝚝𝚎𝚡𝚝</div>
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</section2>
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<section2 topic='Emphasis' anchor='emphasis'>
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<p>To format a string with Emphasis, the individual code-points need
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to be converted to their integer representation, then increased by
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<tt>0x1D3F3</tt> (capital letters) or <tt>0x1D3ED</tt> (lowercase letters)
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and then converted back to characters.</p>
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<div class='example'>Emphasis → 𝐸𝑚𝑝ℎ𝑎𝑠𝑖𝑠</div>
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</section2>
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<section2 topic='Strong Emphasis' anchor='strong'>
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<p>To format a string with Strong Emphasis, the individual code-points need
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to be converted to their integer representation, then increased by
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<tt>0x1D3BF</tt> (capital letters) or <tt>0x1D3B9</tt> (lowercase letters)
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and then converted back to characters.</p>
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<div class='example'>Strong Emphasis → 𝐒𝐭𝐫𝐨𝐧𝐠 𝐄𝐦𝐩𝐡𝐚𝐬𝐢𝐬</div>
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</section2>
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<section2 topic='Very Strong Emphasis' anchor='strong-emphasis'>
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<p>To format a string with Very Very Strong Emphasis, the individual code-points need
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to be converted to their integer representation, then increased by
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<tt>0x1D427</tt> (capital letters) or <tt>0x1D421</tt> (lowercase letters)
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and then converted back to characters.</p>
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<div class='example'>Very Strong Emphasis → 𝑽𝒆𝒓𝒚 𝑺𝒕𝒓𝒐𝒏𝒈 𝑬𝒎𝒑𝒉𝒂𝒔𝒊𝒔</div>
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</section2>
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<section2 topic='Strike through' anchor='strike'>
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<p>To format a string as struck through, each code-point needs to be
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extended with a U-0336 COMBINING LONG STROKE OVERLAY postfix.</p>
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<div class='example'>Strike through → S̶t̶r̶i̶k̶e̶ ̶t̶h̶r̶o̶u̶g̶h̶</div>
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</section2>
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</section1>
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<section1 topic='Implementation Notes' anchor='impl'>
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<p>Some clients will use a serif-less font instead of a serif font to display
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instant messages, or even allow the user to choose an arbitrary font. The
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formatting defined in this document assumes the use of serif fonts, however.
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If a formatted text is to be displayed in a context that is not supposed to
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render serifs, the displaying implementation MUST add <tt>0x1D4</tt> to the
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respective integer representations of the fancy code-points.
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</p>
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<p>On the wire, the serif representation always MUST be used.</p>
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<p>Determining whether a given display font is serif or sans-serif is out of
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scope of this specification.</p>
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</section1>
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<section1 topic='Accessibility Considerations' anchor='access'>
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<p>𝞜𝞸𝞰𝞮</p>
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</section1>
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<section1 topic='Internationalization Considerations' anchor='i18n'>
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<p>🇳🇴🇳🇪</p>
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</section1>
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<section1 topic='Security Considerations' anchor='security'>
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<p>The rendering of fonts is a complex task performed in the most inner guts
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of the operating system. Over the last decades, various exploits have been
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discovered in all major operating systems. Unfortunately, fixing those
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issues is far beyond the abilities of a simple XMPP client.</p>
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</section1>
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<section1 topic='IANA Considerations' anchor='iana'>
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<p>
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This document requires no interaction with &IANA;.
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</p>
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</section1>
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<section1 topic='XMPP Registrar Considerations' anchor='registrar'>
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<p>None.</p>
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</section1>
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</xep>
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1
xep.ent
1
xep.ent
@ -1621,3 +1621,4 @@ IANA Service Location Protocol, Version 2 (SLPv2) Templates</link></span> <note>
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<!ENTITY xep0454 "<span class='ref'><link url='https://xmpp.org/extensions/xep-0454.html'>OMEMO Media sharing (XEP-0454)</link></span> <note>XEP-0454: OMEMO Media sharing <<link url='https://xmpp.org/extensions/xep-0454.html'>https://xmpp.org/extensions/xep-0454.html</link>>.</note>" >
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<!ENTITY xep0455 "<span class='ref'><link url='https://xmpp.org/extensions/xep-0455.html'>Service Outage Status (XEP-0455)</link></span> <note>XEP-0455: Service Outage Status <<link url='https://xmpp.org/extensions/xep-0455.html'>https://xmpp.org/extensions/xep-0455.html</link>>.</note>" >
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<!ENTITY xep0456 "<span class='ref'><link url='https://xmpp.org/extensions/xep-0456.html'>Content Rating Labels (XEP-0456)</link></span> <note>XEP-0456: Content Rating Labels <<link url='https://xmpp.org/extensions/xep-0456.html'>https://xmpp.org/extensions/xep-0456.html</link>>.</note>" >
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<!ENTITY xep0457 "<span class='ref'><link url='https://xmpp.org/extensions/xep-0457.html'>Message Fancying (XEP-0457)</link></span> <note>XEP-0457: Message Fancying <<link url='https://xmpp.org/extensions/xep-0457.html'>https://xmpp.org/extensions/xep-0457.html</link>>.</note>" >
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