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https://github.com/moparisthebest/xeps
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XEP-0393: update glossary/security considerations
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Sam Whited
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218
xep-0393.xml
218
xep-0393.xml
@ -25,6 +25,17 @@
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<supersededby/>
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<shortname>styling</shortname>
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&sam;
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<revision>
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<version>0.1.1</version>
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<date>2018-01-12</date>
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<initials>ssw</initials>
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<remark>
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<p>
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Minor clarifications and updates, add security considerations, and
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expand the glossary.
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</p>
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</remark>
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</revision>
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<revision>
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<version>0.1.0</version>
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<date>2017-11-22</date>
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@ -95,6 +106,20 @@
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The term "formatted text" is defined in &rfc7764;.
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</p>
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<dl>
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<di>
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<dt>Block</dt>
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<dd>
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Any chunk of text that can be parsed unambiguously in one pass.
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Blocks may contain one or more children which may be other blocks or
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spans.
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For example:
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<ul>
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<li>A single line of text comprising one or more spans</li>
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<li>A block quotation</li>
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<li>A preformatted code block</li>
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</ul>
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</dd>
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</di>
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<di>
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<dt>Formal markup language</dt>
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<dd>
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@ -110,6 +135,37 @@
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the text by computer programs.
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</dd>
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</di>
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<di>
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<dt>Span</dt>
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<dd>
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A group of text that is rendered inline and where the entire group is
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rendered in the same manner.
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Spans may be either plain text with no formatting applied, or may be
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formatted text that is enclosed by two styling directives.
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Spans are always children of blocks and may not escape from their
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containing block.
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The following all contain spans marked by parenthesis:
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<ul>
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<li>(plain span)</li>
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<li>(<strong>*strong span*</strong>)</li>
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<li>(<em>_emphasized span_</em>)</li>
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<li>(<em>_emphasized span containing </em>(<em><strong>*strong span*</strong></em>)<em>_</em>)</li>
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<li>(span one )(<strong>*span two*</strong>)</li>
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</ul>
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</dd>
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</di>
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<di>
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<dt>Styling directive</dt>
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<dd>
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A character or set of characters that indicates the beginning of a span
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or block.
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For example, in certain contexts the characters '*' (U+002A ASTERISK),
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and '_' (U+005F LOW LINE) may be styling directives that indicate the
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beginning of a strong or emphasis span and the string '```' (U+0060
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GRAVE ACCENT) may be a styling directive that indicate the beginning of
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a preformatted code block.
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</dd>
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</di>
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<di>
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<dt>Whitespace character</dt>
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<dd>
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@ -136,32 +192,7 @@
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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='Blocks' anchor='block'>
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<p>
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A block is any chunk of text that can be parsed unambiguously in one pass.
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</p>
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<ul>
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<li>A single line of text comprising one or more spans</li>
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<li>A block quotation</li>
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<li>A preformatted code block</li>
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</ul>
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</section2>
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<section2 topic='Spans' anchor='span'>
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<p>
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A span is a group of text that is rendered inline and where the entire
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group is rendered in the same manner.
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Spans may be either plain text with no formatting applied, or may be
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formatted text that is enclosed by two styling directives.
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Spans may not escape from their containing block.
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The following all contain spans marked by parenthesis:
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</p>
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<ul>
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<li>(plain span)</li>
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<li>(<strong>*strong span*</strong>)</li>
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<li>(<em>_emphasized span_</em>)</li>
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<li>(<em>_emphasized span containing </em>(<em><strong>*strong span*</strong></em>)<em>_</em>)</li>
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<li>(span one )(<strong>*span two*</strong>)</li>
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</ul>
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<p>
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Matches of spans between two styling directives MUST contain some text
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between the two styling directives and the opening styling directive MUST
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@ -198,72 +229,73 @@
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<li>**</li>
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<li>****</li>
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</ul>
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</section2>
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<section2 topic='Strong' anchor='strong'>
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<p>
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Text enclosed by '*' (U+002A ASTERISK) is strong SHOULD be displayed as
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bold.
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</p>
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<example caption='Strong'><![CDATA[
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<section3 topic='Strong' anchor='strong'>
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<p>
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Text enclosed by '*' (U+002A ASTERISK) is strong SHOULD be displayed as
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bold.
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</p>
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<example caption='Strong'><![CDATA[
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<body>
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The full title is "Twelfth Night, or What You Will" but
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*most* people shorten it.
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</body>
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]]></example>
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</section2>
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<section2 topic='Emphasis' anchor='emph'>
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<p>
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Text enclosed by '_' (U+005F LOW LINE) is emphasized and SHOULD be
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displayed in italics.
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</p>
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<example caption='Italic'><![CDATA[
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</section3>
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<section3 topic='Emphasis' anchor='emph'>
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<p>
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Text enclosed by '_' (U+005F LOW LINE) is emphasized and SHOULD be
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displayed in italics.
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</p>
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<example caption='Italic'><![CDATA[
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<body>
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The full title is _Twelfth Night, or What You Will_ but
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_most_ people shorten it.
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</body>
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]]></example>
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</section2>
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<section2 topic='Strike through' anchor='strike'>
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<p>
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Text enclosed by '~' (U+007E TILDE) SHOULD be displayed with a horizontal
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line through the middle.
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</p>
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<example caption='Strike through'><![CDATA[
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</section3>
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<section3 topic='Strike through' anchor='strike'>
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<p>
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Text enclosed by '~' (U+007E TILDE) SHOULD be displayed with a horizontal
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line through the middle.
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</p>
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<example caption='Strike through'><![CDATA[
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<body>
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Everyone ~dis~likes cake.
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</body>
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]]></example>
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</section2>
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<section2 topic='Preformatted Span' anchor='mono'>
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<p>
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Text enclosed by a '`' (U+0060 GRAVE ACCENT) is a preformatted span SHOULD
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be displayed inline in a monospace font.
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A preformatted span may only contain plaintext.
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Inline formatting directives inside the preformatted span are not
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rendered.
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For example, the following all contain valid preformatted spans:
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</p>
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<ul>
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<li>This is <tt>`monospace`</tt></li>
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<li>This is <tt>`*monospace*`</tt></li>
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<li>This is <strong><tt>*`monospace and bold`*</tt></strong></li>
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</ul>
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<example caption='Monospace text'><![CDATA[
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</section3>
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<section3 topic='Preformatted Span' anchor='mono'>
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<p>
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Text enclosed by a '`' (U+0060 GRAVE ACCENT) is a preformatted span SHOULD
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be displayed inline in a monospace font.
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A preformatted span may only contain plaintext.
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Inline formatting directives inside the preformatted span are not
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rendered.
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For example, the following all contain valid preformatted spans:
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</p>
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<ul>
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<li>This is <tt>`monospace`</tt></li>
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<li>This is <tt>`*monospace*`</tt></li>
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<li>This is <strong><tt>*`monospace and bold`*</tt></strong></li>
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</ul>
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<example caption='Monospace text'><![CDATA[
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<body>
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Wow, I can write in `monospace`!
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</body>
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]]></example>
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</section3>
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</section2>
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<section2 topic='Preformatted Block' anchor='pre-block'>
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<p>
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A preformatted text block is started by a line beginning with "```"
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(U+0060 GRAVE ACCENT), and ended by a line containing only three grave
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accents or the end of the parent block (whichever comes first).
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Preformatted text blocks cannot contain child blocks and other styling
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MUST NOT be rendered inside the block.
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Text inside a preformatted block SHOULD be displayed in a monospace font.
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</p>
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<example caption='Preformatted block text'><![CDATA[
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<section2 topic='Blocks' anchor='block'>
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<section3 topic='Preformatted Block' anchor='pre-block'>
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<p>
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A preformatted text block is started by a line beginning with "```"
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(U+0060 GRAVE ACCENT), and ended by a line containing only three grave
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accents or the end of the parent block (whichever comes first).
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Preformatted text blocks cannot contain child blocks and other styling
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MUST NOT be rendered inside the block.
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Text inside a preformatted block SHOULD be displayed in a monospace font.
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</p>
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<example caption='Preformatted block text'><![CDATA[
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<body>
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```ignored
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(println "Hello, world!")
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@ -272,7 +304,7 @@
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This should show up as monospace, preformatted text ⤴
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</body>
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]]></example>
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<example caption='No closing preformatted text sequence'><![CDATA[
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<example caption='No closing preformatted text sequence'><![CDATA[
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<body>
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> ```
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> (println "Hello, world!")
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@ -281,23 +313,23 @@
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plaintext!
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</body>
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]]></example>
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</section2>
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<section2 topic='Quotations' anchor='quote'>
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<p>
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A quotation is indicated by one or more lines with a byte stream beginning
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with a '>' (U+003E GREATER-THAN SIGN).
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Block quotes may contain any child block, including other quotations.
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Lines inside the block quote MUST have leading spaces trimmed before
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parsing the child block.
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</p>
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<example caption='Quotation (LTR)'><![CDATA[
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</section3>
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<section3 topic='Quotations' anchor='quote'>
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<p>
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A quotation is indicated by one or more lines with a byte stream beginning
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with a '>' (U+003E GREATER-THAN SIGN).
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Block quotes may contain any child block, including other quotations.
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Lines inside the block quote MUST have leading spaces trimmed before
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parsing the child block.
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</p>
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<example caption='Quotation (LTR)'><![CDATA[
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<body>
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> That that is, is.
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Said the old hermit of Prague.
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</body>
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]]></example>
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<example caption='Nested Quotation'><![CDATA[
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<example caption='Nested Quotation'><![CDATA[
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<body>
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>> That that is, is.
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> Said the old hermit of Prague.
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@ -305,17 +337,17 @@
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Who?
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</body>
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]]></example>
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</section3>
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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>
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This document does not define a regular grammar and thus styling cannot be
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matched by a regular expression.
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Instead, a predictive recursive descent or LALR parser may be constructed.
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For instance, a simple parser can be constructed by first parsing all text
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into blocks and then recursively parsing the child-blocks inside block
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quotations, the spans inside plain lines, and by returning the text inside
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preformatted blocks without modification.
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Instead, a simple parser can be constructed by first parsing all text into
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blocks and then recursively parsing the child-blocks inside block
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quotations, the spans inside individual lines, and by returning the text
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inside preformatted blocks without modification.
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</p>
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<p>
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It is RECOMMENDED that formatting characters be displayed and formatted in
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@ -336,11 +368,11 @@
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exclude formatting characters from being read.
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</p>
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</section1>
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<section1 topic='Internationalization Considerations' anchor='i18n'>
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<p>OPTIONAL.</p>
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</section1>
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<section1 topic='Security Considerations' anchor='security'>
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<p>REQUIRED.</p>
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<p>
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Authors of message styling parsers should take care that improperly
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formatted messages cannot lead to buffer overruns or code execution.
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</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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