--- a/ttml-ww-profiles/ttml-ww-profiles.html Mon Sep 29 10:10:13 2014 -0700
+++ b/ttml-ww-profiles/ttml-ww-profiles.html Tue Oct 21 13:15:05 2014 -0700
@@ -211,13 +211,15 @@
<body class="h-entry" role="document" id="respecDocument"><div class="head" role="contentinfo" id="respecHeader">
<p>
-
- <a href="http://www.w3.org/"><img width="72" height="48" src="https://www.w3.org/Icons/w3c_home" alt="W3C"></a>
-
+
+
+ <a href="http://www.w3.org/"><img width="72" height="48" src="https://www.w3.org/Icons/w3c_home" alt="W3C"></a>
+
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</p>
<h1 class="title p-name" id="title" property="dcterms:title">TTML Text and Image Profiles for Internet Media Subtitles and Captions 1.0</h1>
- <h2 property="dcterms:issued" datatype="xsd:dateTime" content="2014-09-30T00:04:00.000Z" id="w3c-editor-s-draft-29-september-2014"><abbr title="World Wide Web Consortium">W3C</abbr> Editor's Draft <time class="dt-published" datetime="2014-09-29">29 September 2014</time></h2>
+ <h2 property="dcterms:issued" datatype="xsd:dateTime" content="2014-10-21T20:13:34.000Z" id="w3c-editor-s-draft-21-october-2014"><abbr title="World Wide Web Consortium">W3C</abbr> Editor's Draft <time class="dt-published" datetime="2014-10-21">21 October 2014</time></h2>
<dl>
<dt>This version:</dt>
@@ -271,7 +273,7 @@
<hr>
</div>
- <section id="abstract" class="introductory" property="dcterms:abstract" datatype="" typeof="bibo:Chapter" resource="#abstract" rel="bibo:Chapter"><h2 aria-level="1" role="heading" id="h2_abstract">Abstract</h2>
+ <section id="abstract" class="introductory" property="dcterms:abstract" datatype="" typeof="bibo:Chapter" resource="#abstract" rel="bibo:Chapter"><h2 role="heading" id="h2_abstract">Abstract</h2>
<p>This document specifies two profiles of [<cite><a class="bibref" href="#bib-TTML1">TTML1</a></cite>]: a text-only profile and an image-only profile. These profiles are
intended to be used across subtitle and caption delivery applications worldwide, thereby simplifying interoperability,
consistent rendering and conversion to other subtitling and captioning formats. The text profile is a superset of
@@ -281,7 +283,7 @@
[<cite><a class="bibref" href="#bib-EBU-TT-D">EBU-TT-D</a></cite>].</p>
<p>Both profiles are based on [<cite><a class="bibref" href="#bib-SUBM">SUBM</a></cite>].</p>
- </section><section id="sotd" class="introductory" typeof="bibo:Chapter" resource="#sotd" rel="bibo:Chapter"><h2 aria-level="1" role="heading" id="h2_sotd">Status of This Document</h2>
+ </section><section id="sotd" class="introductory" typeof="bibo:Chapter" resource="#sotd" rel="bibo:Chapter"><h2 role="heading" id="h2_sotd">Status of This Document</h2>
@@ -298,7 +300,7 @@
If you wish to make comments regarding this document, please send them to
- <a href="mailto:public-tt@w3.org?subject=[imsc]">public-tt@w3.org</a>
+ <a href="mailto:public-tt@w3.org?subject=%5Bimsc%5D">public-tt@w3.org</a>
(<a href="mailto:public-tt-request@w3.org?subject=subscribe">subscribe</a>,
<a href="http://lists.w3.org/Archives/Public/public-tt/">archives</a>)
with <code>[imsc]</code> at the start of your email's subject.
@@ -350,12 +352,12 @@
-</section><section id="toc"><h2 class="introductory" aria-level="1" role="heading" id="h2_toc">Table of Contents</h2><ul class="toc" role="directory" id="respecContents"><li class="tocline"><a href="#scope" class="tocxref"><span class="secno">1. </span>Scope</a></li><li class="tocline"><a href="#terms" class="tocxref"><span class="secno">2. </span>Terms and Definitions</a></li><li class="tocline"><a href="#conformance" class="tocxref"><span class="secno">3. </span>Conformance</a></li><li class="tocline"><a href="#profiles" class="tocxref"><span class="secno">4. </span>Profiles</a><ul class="toc"><li class="tocline"><a href="#general" class="tocxref"><span class="secno">4.1 </span>General</a></li><li class="tocline"><a href="#text-profile" class="tocxref"><span class="secno">4.2 </span>Text Profile</a></li><li class="tocline"><a href="#image-profile" class="tocxref"><span class="secno">4.3 </span>Image Profile</a></li></ul></li><li class="tocline"><a href="#common-constraints" class="tocxref"><span class="secno">5. </span>Common Constraints</a><ul class="toc"><li class="tocline"><a href="#document-encoding" class="tocxref"><span class="secno">5.1 </span>Document Encoding</a></li><li class="tocline"><a href="#foreign-element-and-attributes" class="tocxref"><span class="secno">5.2 </span>Foreign Element and Attributes</a></li><li class="tocline"><a href="#namespaces" class="tocxref"><span class="secno">5.3 </span>Namespaces</a></li><li class="tocline"><a href="#overflow" class="tocxref"><span class="secno">5.4 </span>Overflow</a></li><li class="tocline"><a href="#related-video-object" class="tocxref"><span class="secno">5.5 </span>Related Video Object</a></li><li class="tocline"><a href="#synchronization" class="tocxref"><span class="secno">5.6 </span>Synchronization</a></li><li class="tocline"><a href="#extensions" class="tocxref"><span class="secno">5.7 </span>Extensions</a><ul class="toc"><li class="tocline"><a href="#ttp-aspectRatio" class="tocxref"><span class="secno">5.7.1 </span>ittp:aspectRatio</a></li><li class="tocline"><a href="#ttp-progressivelyDecodable" class="tocxref"><span class="secno">5.7.2 </span>ittp:progressivelyDecodable</a></li><li class="tocline"><a href="#tts-forcedDisplay" class="tocxref"><span class="secno">5.7.3 </span>itts:forcedDisplay</a></li><li class="tocline"><a href="#ttm-altText" class="tocxref"><span class="secno">5.7.4 </span>ittm:altText</a></li></ul></li><li class="tocline"><a href="#region" class="tocxref"><span class="secno">5.8 </span>Region</a><ul class="toc"><li class="tocline"><a href="#presented-region" class="tocxref"><span class="secno">5.8.1 </span>Presented Region</a></li><li class="tocline"><a href="#dimensions-and-position" class="tocxref"><span class="secno">5.8.2 </span>Dimensions and Position</a></li><li class="tocline"><a href="#maximum-number" class="tocxref"><span class="secno">5.8.3 </span>Maximum number</a></li></ul></li><li class="tocline"><a href="#hypothetical-render-model-1" class="tocxref"><span class="secno">5.9 </span>Hypothetical Render Model</a></li><li class="tocline"><a href="#common-features" class="tocxref"><span class="secno">5.10 </span>Features</a></li></ul></li><li class="tocline"><a href="#text-profile-constraints" class="tocxref"><span class="secno">6. </span>Text Profile Constraints</a><ul class="toc"><li class="tocline"><a href="#text-profile-designator" class="tocxref"><span class="secno">6.1 </span>Profile Designator</a></li><li class="tocline"><a href="#recommended-character-sets" class="tocxref"><span class="secno">6.2 </span>Recommended Character Sets</a></li><li class="tocline"><a href="#features" class="tocxref"><span class="secno">6.3 </span>Features</a></li></ul></li><li class="tocline"><a href="#image-profile-constraints" class="tocxref"><span class="secno">7. </span>Image Profile Constraints</a><ul class="toc"><li class="tocline"><a href="#image-profile-designator" class="tocxref"><span class="secno">7.1 </span>Profile Designator</a></li><li class="tocline"><a href="#presented-image" class="tocxref"><span class="secno">7.2 </span>Presented Image</a><ul class="toc"><li class="tocline"><a href="#definition" class="tocxref"><span class="secno">7.2.1 </span>Definition</a></li><li class="tocline"><a href="#number-per-region" class="tocxref"><span class="secno">7.2.2 </span>Number per Region</a></li></ul></li><li class="tocline"><a href="#div-element" class="tocxref"><span class="secno">7.3 </span><code>div</code> element</a></li><li class="tocline"><a href="#features-1" class="tocxref"><span class="secno">7.4 </span>Features</a></li></ul></li><li class="tocline"><a href="#hypothetical-render-model" class="tocxref"><span class="secno">8. </span>Hypothetical Render Model</a><ul class="toc"><li class="tocline"><a href="#performance-model" class="tocxref"><span class="secno">8.1 </span>Performance Model</a><ul class="toc"><li class="tocline"><a href="#overview" class="tocxref"><span class="secno">8.1.1 </span>Overview</a></li><li class="tocline"><a href="#general-1" class="tocxref"><span class="secno">8.1.2 </span>General</a></li><li class="tocline"><a href="#paint-regions" class="tocxref"><span class="secno">8.1.3 </span>Paint Regions</a></li><li class="tocline"><a href="#paint-images" class="tocxref"><span class="secno">8.1.4 </span>Paint Images</a></li><li class="tocline"><a href="#paint-text" class="tocxref"><span class="secno">8.1.5 </span>Paint Text</a></li></ul></li><li class="tocline"><a href="#reference-fonts" class="tocxref"><span class="secno">8.2 </span>Reference Fonts</a></li></ul></li><li class="tocline"><a href="#recommended-unicode-code-points-per-language" class="tocxref"><span class="secno">A. </span>Recommended Character Sets</a></li><li class="tocline"><a href="#forced-content" class="tocxref"><span class="secno">B. </span>Forced content (non-normative)</a></li><li class="tocline"><a href="#wcag-applications" class="tocxref"><span class="secno">C. </span>WCAG Considerations</a></li><li class="tocline"><a href="#features-and-extensions" class="tocxref"><span class="secno">D. </span>Extensions</a><ul class="toc"><li class="tocline"><a href="#general-2" class="tocxref"><span class="secno">D.1 </span>General</a></li><li class="tocline"><a href="#progressivelydecodable" class="tocxref"><span class="secno">D.2 </span>#progressivelyDecodable</a></li><li class="tocline"><a href="#aspectratio" class="tocxref"><span class="secno">D.3 </span>#aspectRatio</a></li><li class="tocline"><a href="#forceddisplay" class="tocxref"><span class="secno">D.4 </span>#forcedDisplay</a></li><li class="tocline"><a href="#alttext" class="tocxref"><span class="secno">D.5 </span>#altText</a></li><li class="tocline"><a href="#linepadding" class="tocxref"><span class="secno">D.6 </span>#linePadding</a></li><li class="tocline"><a href="#multirowalign" class="tocxref"><span class="secno">D.7 </span>#multiRowAlign</a></li></ul></li><li class="tocline"><a href="#references" class="tocxref"><span class="secno">E. </span>References</a><ul class="toc"><li class="tocline"><a href="#normative-references" class="tocxref"><span class="secno">E.1 </span>Normative references</a></li><li class="tocline"><a href="#informative-references" class="tocxref"><span class="secno">E.2 </span>Informative references</a></li></ul></li></ul></section>
+</section><section id="toc"><h2 class="introductory" role="heading" id="h2_toc">Table of Contents</h2><ul class="toc" role="directory" id="respecContents"><li class="tocline"><a href="#scope" class="tocxref"><span class="secno">1. </span>Scope</a></li><li class="tocline"><a href="#terms" class="tocxref"><span class="secno">2. </span>Terms and Definitions</a></li><li class="tocline"><a href="#conformance" class="tocxref"><span class="secno">3. </span>Conformance</a></li><li class="tocline"><a href="#profiles" class="tocxref"><span class="secno">4. </span>Profiles</a><ul class="toc"><li class="tocline"><a href="#general" class="tocxref"><span class="secno">4.1 </span>General</a></li><li class="tocline"><a href="#text-profile" class="tocxref"><span class="secno">4.2 </span>Text Profile</a></li><li class="tocline"><a href="#image-profile" class="tocxref"><span class="secno">4.3 </span>Image Profile</a></li></ul></li><li class="tocline"><a href="#common-constraints" class="tocxref"><span class="secno">5. </span>Common Constraints</a><ul class="toc"><li class="tocline"><a href="#document-encoding" class="tocxref"><span class="secno">5.1 </span>Document Encoding</a></li><li class="tocline"><a href="#foreign-element-and-attributes" class="tocxref"><span class="secno">5.2 </span>Foreign Element and Attributes</a></li><li class="tocline"><a href="#namespaces" class="tocxref"><span class="secno">5.3 </span>Namespaces</a></li><li class="tocline"><a href="#overflow" class="tocxref"><span class="secno">5.4 </span>Overflow</a></li><li class="tocline"><a href="#related-video-object" class="tocxref"><span class="secno">5.5 </span>Related Video Object</a></li><li class="tocline"><a href="#synchronization" class="tocxref"><span class="secno">5.6 </span>Synchronization</a></li><li class="tocline"><a href="#extensions" class="tocxref"><span class="secno">5.7 </span>Extensions</a><ul class="toc"><li class="tocline"><a href="#ttp-aspectRatio" class="tocxref"><span class="secno">5.7.1 </span>ittp:aspectRatio</a></li><li class="tocline"><a href="#ttp-progressivelyDecodable" class="tocxref"><span class="secno">5.7.2 </span>ittp:progressivelyDecodable</a></li><li class="tocline"><a href="#tts-forcedDisplay" class="tocxref"><span class="secno">5.7.3 </span>itts:forcedDisplay</a></li><li class="tocline"><a href="#ttm-altText" class="tocxref"><span class="secno">5.7.4 </span>ittm:altText</a></li></ul></li><li class="tocline"><a href="#region" class="tocxref"><span class="secno">5.8 </span>Region</a><ul class="toc"><li class="tocline"><a href="#presented-region" class="tocxref"><span class="secno">5.8.1 </span>Presented Region</a></li><li class="tocline"><a href="#dimensions-and-position" class="tocxref"><span class="secno">5.8.2 </span>Dimensions and Position</a></li><li class="tocline"><a href="#maximum-number" class="tocxref"><span class="secno">5.8.3 </span>Maximum number</a></li></ul></li><li class="tocline"><a href="#hypothetical-render-model-1" class="tocxref"><span class="secno">5.9 </span>Hypothetical Render Model</a></li><li class="tocline"><a href="#common-features" class="tocxref"><span class="secno">5.10 </span>Features</a></li></ul></li><li class="tocline"><a href="#text-profile-constraints" class="tocxref"><span class="secno">6. </span>Text Profile Constraints</a><ul class="toc"><li class="tocline"><a href="#text-profile-designator" class="tocxref"><span class="secno">6.1 </span>Profile Designator</a></li><li class="tocline"><a href="#recommended-character-sets" class="tocxref"><span class="secno">6.2 </span>Recommended Character Sets</a></li><li class="tocline"><a href="#features" class="tocxref"><span class="secno">6.3 </span>Features</a></li></ul></li><li class="tocline"><a href="#image-profile-constraints" class="tocxref"><span class="secno">7. </span>Image Profile Constraints</a><ul class="toc"><li class="tocline"><a href="#image-profile-designator" class="tocxref"><span class="secno">7.1 </span>Profile Designator</a></li><li class="tocline"><a href="#presented-image" class="tocxref"><span class="secno">7.2 </span>Presented Image</a><ul class="toc"><li class="tocline"><a href="#definition" class="tocxref"><span class="secno">7.2.1 </span>Definition</a></li><li class="tocline"><a href="#number-per-region" class="tocxref"><span class="secno">7.2.2 </span>Number per Region</a></li></ul></li><li class="tocline"><a href="#div-element" class="tocxref"><span class="secno">7.3 </span><code>div</code> element</a></li><li class="tocline"><a href="#features-1" class="tocxref"><span class="secno">7.4 </span>Features</a></li></ul></li><li class="tocline"><a href="#hypothetical-render-model" class="tocxref"><span class="secno">8. </span>Hypothetical Render Model</a><ul class="toc"><li class="tocline"><a href="#performance-model" class="tocxref"><span class="secno">8.1 </span>Performance Model</a><ul class="toc"><li class="tocline"><a href="#overview" class="tocxref"><span class="secno">8.1.1 </span>Overview</a></li><li class="tocline"><a href="#general-1" class="tocxref"><span class="secno">8.1.2 </span>General</a></li><li class="tocline"><a href="#paint-regions" class="tocxref"><span class="secno">8.1.3 </span>Paint Regions</a></li><li class="tocline"><a href="#paint-images" class="tocxref"><span class="secno">8.1.4 </span>Paint Images</a></li><li class="tocline"><a href="#paint-text" class="tocxref"><span class="secno">8.1.5 </span>Paint Text</a></li></ul></li><li class="tocline"><a href="#reference-fonts" class="tocxref"><span class="secno">8.2 </span>Reference Fonts</a></li></ul></li><li class="tocline"><a href="#recommended-unicode-code-points-per-language" class="tocxref"><span class="secno">A. </span>Recommended Character Sets</a></li><li class="tocline"><a href="#forced-content" class="tocxref"><span class="secno">B. </span>Forced content (non-normative)</a></li><li class="tocline"><a href="#wcag-applications" class="tocxref"><span class="secno">C. </span>WCAG Considerations</a></li><li class="tocline"><a href="#features-and-extensions" class="tocxref"><span class="secno">D. </span>Extensions</a><ul class="toc"><li class="tocline"><a href="#general-2" class="tocxref"><span class="secno">D.1 </span>General</a></li><li class="tocline"><a href="#progressivelydecodable" class="tocxref"><span class="secno">D.2 </span>#progressivelyDecodable</a></li><li class="tocline"><a href="#aspectratio" class="tocxref"><span class="secno">D.3 </span>#aspectRatio</a></li><li class="tocline"><a href="#forceddisplay" class="tocxref"><span class="secno">D.4 </span>#forcedDisplay</a></li><li class="tocline"><a href="#alttext" class="tocxref"><span class="secno">D.5 </span>#altText</a></li><li class="tocline"><a href="#linepadding" class="tocxref"><span class="secno">D.6 </span>#linePadding</a></li><li class="tocline"><a href="#multirowalign" class="tocxref"><span class="secno">D.7 </span>#multiRowAlign</a></li></ul></li><li class="tocline"><a href="#references" class="tocxref"><span class="secno">E. </span>References</a><ul class="toc"><li class="tocline"><a href="#normative-references" class="tocxref"><span class="secno">E.1 </span>Normative references</a></li><li class="tocline"><a href="#informative-references" class="tocxref"><span class="secno">E.2 </span>Informative references</a></li></ul></li></ul></section>
<section id="scope" typeof="bibo:Chapter" resource="#scope" rel="bibo:Chapter">
- <!--OddPage--><h2 aria-level="1" role="heading" id="h2_scope"><span class="secno">1. </span>Scope</h2>
+ <!--OddPage--><h2 role="heading" id="h2_scope"><span class="secno">1. </span>Scope</h2>
<p>This document specifies two profiles of [<cite><a class="bibref" href="#bib-TTML1">TTML1</a></cite>]: a text-only profile and an image-only profile. These profiles are
intended for subtitle and caption delivery worldwide, including dialog language translation, content description, captions for
@@ -368,7 +370,7 @@
</section>
<section id="terms" typeof="bibo:Chapter" resource="#terms" rel="bibo:Chapter">
- <!--OddPage--><h2 aria-level="1" role="heading" id="h2_terms"><span class="secno">2. </span>Terms and Definitions</h2>
+ <!--OddPage--><h2 role="heading" id="h2_terms"><span class="secno">2. </span>Terms and Definitions</h2>
<p><dfn id="dfn-presentation-processor">Presentation processor</dfn>. See Section 2.2 at [<cite><a class="bibref" href="#bib-TTML1">TTML1</a></cite>].</p>
@@ -379,15 +381,14 @@
<p><dfn id="dfn-related-media-object">Related Media Object</dfn>. See Section 2.2 at [<cite><a class="bibref" href="#bib-TTML1">TTML1</a></cite>].</p>
</section>
- <section id="conformance" typeof="bibo:Chapter" resource="#conformance" rel="bibo:Chapter"><!--OddPage--><h2 aria-level="1" role="heading" id="h2_conformance"><span class="secno">3. </span>Conformance</h2>
+ <section id="conformance" typeof="bibo:Chapter" resource="#conformance" rel="bibo:Chapter"><!--OddPage--><h2 role="heading" id="h2_conformance"><span class="secno">3. </span>Conformance</h2>
<p>
As well as sections marked as non-normative, all authoring guidelines, diagrams, examples,
and notes in this specification are non-normative. Everything else in this specification is
normative.
</p>
-<p>
- The key words <em class="rfc2119" title="MUST">MUST</em>, <em class="rfc2119" title="MUST NOT">MUST NOT</em>, <em class="rfc2119" title="REQUIRED">REQUIRED</em>, <em class="rfc2119" title="SHOULD">SHOULD</em>, <em class="rfc2119" title="SHOULD NOT">SHOULD NOT</em>, <em class="rfc2119" title="RECOMMENDED">RECOMMENDED</em>, <em class="rfc2119" title="MAY">MAY</em>,
- and <em class="rfc2119" title="OPTIONAL">OPTIONAL</em> in this specification are to be interpreted as described in [<cite><a class="bibref" href="#bib-RFC2119">RFC2119</a></cite>].
+<p id="respecRFC2119">The key words <em class="rfc2119" title="MAY">MAY</em>, <em class="rfc2119" title="SHALL">SHALL</em>, <em class="rfc2119" title="SHALL NOT">SHALL NOT</em>, and <em class="rfc2119" title="SHOULD">SHOULD</em> are
+ to be interpreted as described in [<cite><a class="bibref" href="#bib-RFC2119">RFC2119</a></cite>].
</p>
<p>A subtitle document that conforms to a profile defined herein <em class="rfc2119" title="SHALL">SHALL</em> satisfy all normative provisions specified by the
@@ -415,7 +416,7 @@
provisions of the profile.</li>
</ul>
- <div class="note"><div class="note-title" aria-level="2" role="heading" id="h_note_1"><span>Note</span></div><p class="">The use of the term <a href="#dfn-presentation-processor" class="internalDFN">presentation processor</a> (<a href="#dfn-transformation-processor" class="internalDFN">transformation processor</a>) within this specification
+ <div class="note"><div class="note-title" aria-level="1" role="heading" id="h_note_1"><span>Note</span></div><p class="">The use of the term <a href="#dfn-presentation-processor" class="internalDFN">presentation processor</a> (<a href="#dfn-transformation-processor" class="internalDFN">transformation processor</a>) within this specification
does not imply conformance to the DFXP Presentation Profile (DFXP Transformation Profile) specified in [<cite><a class="bibref" href="#bib-TTML1">TTML1</a></cite>]. In other
words, it is not considered an error for a <a href="#dfn-presentation-processor" class="internalDFN">presentation processor</a> (<a href="#dfn-transformation-processor" class="internalDFN">transformation processor</a>) to conform to a
profile defined in this specification without also conforming to the DFXP Presentation Profile (DFXP Transformation
@@ -423,10 +424,10 @@
</section>
<section id="profiles" typeof="bibo:Chapter" resource="#profiles" rel="bibo:Chapter">
- <!--OddPage--><h2 aria-level="1" role="heading" id="h2_profiles"><span class="secno">4. </span>Profiles</h2>
+ <!--OddPage--><h2 role="heading" id="h2_profiles"><span class="secno">4. </span>Profiles</h2>
<section id="general">
- <h3 aria-level="2" role="heading" id="h3_general"><span class="secno">4.1 </span>General</h3>
+ <h3 role="heading" id="h3_general"><span class="secno">4.1 </span>General</h3>
<p>A subtitle document <em class="rfc2119" title="SHALL NOT">SHALL NOT</em> conform to the <a href="#dfn-text-profile" class="internalDFN">Text Profile</a> and <a href="#dfn-image-profile" class="internalDFN">Image Profile</a> simultaneously.</p>
@@ -436,7 +437,7 @@
subtitle document such that, when image content is encountered, assistive technologies have access to its corresponding text
form.</p>
- <div class="note"><div class="note-title" aria-level="3" role="heading" id="h_note_2"><span>Note</span></div><p class="">The <code>ittm:altText</code> element specified <a href="#ttm-altText" class="sec-ref"><span class="secno">5.7.4</span> <span class="sec-title">ittm:altText</span></a> also allows text equivalent
+ <div class="note"><div class="note-title" aria-level="2" role="heading" id="h_note_2"><span>Note</span></div><p class="">The <code>ittm:altText</code> element specified <a href="#ttm-altText" class="sec-ref"><span class="secno">5.7.4</span> <span class="sec-title">ittm:altText</span></a> also allows text equivalent
string to be associated with an image, e.g. to support indexation of the content and also facilitate quality checking of the
document during authoring.</p></div>
@@ -445,29 +446,29 @@
</section>
<section id="text-profile">
- <h3 aria-level="2" role="heading" id="h3_text-profile"><span class="secno">4.2 </span>Text Profile</h3>
+ <h3 role="heading" id="h3_text-profile"><span class="secno">4.2 </span>Text Profile</h3>
<p>The <dfn id="dfn-text-profile">Text Profile</dfn> consists of Sections <a href="#common-constraints" class="sec-ref"><span class="secno">5.</span> <span class="sec-title">Common Constraints</span></a> and <a href="#text-profile-constraints" class="sec-ref"><span class="secno">6.</span> <span class="sec-title">Text Profile Constraints</span></a>.</p>
</section>
<section id="image-profile">
- <h3 aria-level="2" role="heading" id="h3_image-profile"><span class="secno">4.3 </span>Image Profile</h3>
+ <h3 role="heading" id="h3_image-profile"><span class="secno">4.3 </span>Image Profile</h3>
<p>The <dfn id="dfn-image-profile">Image Profile</dfn> consists of Sections <a href="#common-constraints" class="sec-ref"><span class="secno">5.</span> <span class="sec-title">Common Constraints</span></a> and <a href="#image-profile-constraints" class="sec-ref"><span class="secno">7.</span> <span class="sec-title">Image Profile Constraints</span></a>.</p>
</section>
</section>
<section id="common-constraints" typeof="bibo:Chapter" resource="#common-constraints" rel="bibo:Chapter">
- <!--OddPage--><h2 aria-level="1" role="heading" id="h2_common-constraints"><span class="secno">5. </span>Common Constraints</h2>
+ <!--OddPage--><h2 role="heading" id="h2_common-constraints"><span class="secno">5. </span>Common Constraints</h2>
<section id="document-encoding">
- <h3 aria-level="2" role="heading" id="h3_document-encoding"><span class="secno">5.1 </span>Document Encoding</h3>
+ <h3 role="heading" id="h3_document-encoding"><span class="secno">5.1 </span>Document Encoding</h3>
<p>A subtitle document <em class="rfc2119" title="SHALL">SHALL</em> use UTF-8 character encoding as specified in [<cite><a class="bibref" href="#bib-UNICODE">UNICODE</a></cite>].</p>
</section>
<section id="foreign-element-and-attributes">
- <h3 aria-level="2" role="heading" id="h3_foreign-element-and-attributes"><span class="secno">5.2 </span>Foreign Element and Attributes</h3>
+ <h3 role="heading" id="h3_foreign-element-and-attributes"><span class="secno">5.2 </span>Foreign Element and Attributes</h3>
<p>A subtitle document <em class="rfc2119" title="MAY">MAY</em> contain elements and attributes that are neither specifically permitted nor forbidden by a
profile. Such elements and attributes <em class="rfc2119" title="MAY">MAY</em> be ignored by the <a href="#dfn-presentation-processor" class="internalDFN">presentation processor</a> or <a href="#dfn-transformation-processor" class="internalDFN">transformation
@@ -475,7 +476,7 @@
</section>
<section id="namespaces">
- <h3 aria-level="2" role="heading" id="h3_namespaces"><span class="secno">5.3 </span>Namespaces</h3>
+ <h3 role="heading" id="h3_namespaces"><span class="secno">5.3 </span>Namespaces</h3>
<p>The following namespaces (see [<cite><a class="bibref" href="#bib-xml-names">xml-names</a></cite>]) are used in this specification:</p>
@@ -620,24 +621,24 @@
</section>
<section id="overflow">
- <h3 aria-level="2" role="heading" id="h3_overflow"><span class="secno">5.4 </span>Overflow</h3>
+ <h3 role="heading" id="h3_overflow"><span class="secno">5.4 </span>Overflow</h3>
<p>Subtitle documents should be authored assuming strict clipping of content that falls out of region areas, regardless of
the computed value of <code>tts:overflow</code> for the region.</p>
- <div class="note"><div class="note-title" aria-level="3" role="heading" id="h_note_3"><span>Note</span></div><p class="">As specified in [<cite><a class="bibref" href="#bib-TTML1">TTML1</a></cite>], <code>tts:overflow</code> has no effect on the extent of the region, and hence
+ <div class="note"><div class="note-title" aria-level="2" role="heading" id="h_note_3"><span>Note</span></div><p class="">As specified in [<cite><a class="bibref" href="#bib-TTML1">TTML1</a></cite>], <code>tts:overflow</code> has no effect on the extent of the region, and hence
the total normalized drawing area S(En) at <a href="#paint-regions" class="sec-ref"><span class="secno">8.1.3</span> <span class="sec-title">Paint Regions</span></a>.</p></div>
</section>
<section id="related-video-object">
- <h3 aria-level="2" role="heading" id="h3_related-video-object"><span class="secno">5.5 </span>Related Video Object</h3>
+ <h3 role="heading" id="h3_related-video-object"><span class="secno">5.5 </span>Related Video Object</h3>
<p>A subtitle document <em class="rfc2119" title="MAY">MAY</em> be associated with a related video object, which <em class="rfc2119" title="SHALL">SHALL</em> consist of a sequence of image frames, each
a rectangular array of pixels, and <em class="rfc2119" title="SHALL">SHALL</em> be considered the <a href="#dfn-related-media-object" class="internalDFN">Related Media Object</a>.</p>
</section>
<section id="synchronization">
- <h3 aria-level="2" role="heading" id="h3_synchronization"><span class="secno">5.6 </span>Synchronization</h3>
+ <h3 role="heading" id="h3_synchronization"><span class="secno">5.6 </span>Synchronization</h3>
<p>Each <a href="#dfn-intermediate-synchronic-document" class="internalDFN">intermediate synchronic document</a> of the subtitle document is intended to be displayed on a specific frame and
removed on a specific frame of the related video object.</p>
@@ -651,7 +652,7 @@
object with a frame rate of 1000 / 1001 × 30 ≈ 29.97.
</aside>
- <div class="note"><div class="note-title" aria-level="3" role="heading" id="h_note_4"><span>Note</span></div><p class="">In typical scenario, the same video program (the related video object) will be used for subtitle document
+ <div class="note"><div class="note-title" aria-level="2" role="heading" id="h_note_4"><span>Note</span></div><p class="">In typical scenario, the same video program (the related video object) will be used for subtitle document
authoring, delivery and user playback. The mapping from media time expression to related video object above allows the author
to precisely associate subtitle video content with video frames, e.g. around scene transitions. In circumstances where the
video program is downsampled during delivery, the application can specify that, at playback, the relative video object be
@@ -661,16 +662,16 @@
<p>If <code>ttp:frameRate</code> is specified, then the product of <code>ttp:frameRate</code> and
<code>ttp:frameRateMultiplier</code> <em class="rfc2119" title="SHALL">SHALL</em> be the frame rate of the related video object.</p>
- <div class="note"><div class="note-title" aria-level="3" role="heading" id="h_note_5"><span>Note</span></div><p class="">A document can be made independent of the frame rate of the related video object by never using the
+ <div class="note"><div class="note-title" aria-level="2" role="heading" id="h_note_5"><span>Note</span></div><p class="">A document can be made independent of the frame rate of the related video object by never using the
<em>frames</em> term in a time expression: as specified in <a href="#common-features" class="sec-ref"><span class="secno">5.10</span> <span class="sec-title">Features</span></a>, <code>ttp:frameRate</code> is
required only if the document includes one or more time expressions that uses the <em>frames</em> term.</p></div>
</section>
<section id="extensions">
- <h3 aria-level="2" role="heading" id="h3_extensions"><span class="secno">5.7 </span>Extensions</h3>
+ <h3 role="heading" id="h3_extensions"><span class="secno">5.7 </span>Extensions</h3>
<section id="ttp-aspectRatio" typeof="bibo:Chapter" resource="#ttp-aspectRatio" rel="bibo:Chapter">
- <h4 aria-level="3" role="heading" id="h4_ttp-aspectRatio"><span class="secno">5.7.1 </span>ittp:aspectRatio</h4>
+ <h4 role="heading" id="h4_ttp-aspectRatio"><span class="secno">5.7.1 </span>ittp:aspectRatio</h4>
<p>The <code>ittp:aspectRatio</code> attributes allows authorial control of the mapping of the root container of a subtitle
document to the related video object frame.</p>
@@ -726,7 +727,7 @@
<p>An <code>ittp:aspectRatio</code> attribute is considered to be significant only when specified on the <code>tt</code>
element.</p>
- <div class="note"><div class="note-title" aria-level="4" role="heading" id="h_note_6"><span>Note</span></div><p class="">As specified in Section <a href="#common-features" class="sec-ref"><span class="secno">5.10</span> <span class="sec-title">Features</span></a>, <code>tts:extent</code> is present if the
+ <div class="note"><div class="note-title" aria-level="3" role="heading" id="h_note_6"><span>Note</span></div><p class="">As specified in Section <a href="#common-features" class="sec-ref"><span class="secno">5.10</span> <span class="sec-title">Features</span></a>, <code>tts:extent</code> is present if the
<code>px</code> length measure is used anywhere within the document.</p></div>
<p>Integer pixel positions on the related video object frame computed from real percentage length values <em class="rfc2119" title="SHALL">SHALL</em> use half-up
@@ -734,7 +735,7 @@
</section>
<section id="ttp-progressivelyDecodable" typeof="bibo:Chapter" resource="#ttp-progressivelyDecodable" rel="bibo:Chapter">
- <h4 aria-level="3" role="heading" id="h4_ttp-progressivelyDecodable"><span class="secno">5.7.2 </span>ittp:progressivelyDecodable</h4>
+ <h4 role="heading" id="h4_ttp-progressivelyDecodable"><span class="secno">5.7.2 </span>ittp:progressivelyDecodable</h4>
<p>A <a href="#dfn-progressively-decodable-subtitle-document" class="internalDFN">progressively decodable subtitle document</a> is structured to facilitate presentation before the document is
received in its entirety, and can be identified using <code>ittp:progressivelyDecodable</code> attribute.</p>
@@ -785,7 +786,7 @@
asserted to be a <a href="#dfn-progressively-decodable-subtitle-document" class="internalDFN">progressively decodable subtitle document</a> nor asserted not to be a progressively decodable subtitle
document.</p>
- <div class="note"><div class="note-title" aria-level="4" role="heading" id="h_note_7"><span>Note</span></div><div class="">
+ <div class="note"><div class="note-title" aria-level="3" role="heading" id="h_note_7"><span>Note</span></div><div class="">
<p>[<cite><a class="bibref" href="#bib-TTML1">TTML1</a></cite>] specifies explicitly referencing of elements identified using <code>xml:id</code> in the following
circumstances:</p>
@@ -812,7 +813,7 @@
</section>
<section id="tts-forcedDisplay" typeof="bibo:Chapter" resource="#tts-forcedDisplay" rel="bibo:Chapter">
- <h4 aria-level="3" role="heading" id="h4_tts-forcedDisplay"><span class="secno">5.7.3 </span>itts:forcedDisplay</h4>
+ <h4 role="heading" id="h4_tts-forcedDisplay"><span class="secno">5.7.3 </span>itts:forcedDisplay</h4>
<p><code>itts:forcedDisplay</code> allows the processor to override the computed value of <code>tts:visibility</code>
attribute in conjunction with an application parameter <code>displayForcedOnlyMode</code>.</p>
@@ -880,23 +881,23 @@
<p>The algorithm for setting the <code>displayForcedOnlyMode</code> parameter based on the circumstances under which the
subtitle document is presented is left to the application.</p>
- <div class="note"><div class="note-title" aria-level="4" role="heading" id="h_note_8"><span>Note</span></div><p class="">The background of a region is drawn even if the computed value of <code>tts:visibility</code> equals
+ <div class="note"><div class="note-title" aria-level="3" role="heading" id="h_note_8"><span>Note</span></div><p class="">The background of a region is drawn even if the computed value of <code>tts:visibility</code> equals
"hidden" for all active content within. This can occur if <code>itts:forcedDisplay</code> equals "false" for all active
content elements within a region for which <code>itts:forcedDisplay</code> equals "true", and
<code>displayForcedOnlyMode</code> equals "true". Authors can avoid this situation, for instance, by ensuring that content
elements and the regions that they are flowed into always have the same value of <code>itts:forcedDisplay</code>.</p></div>
- <div class="note"><div class="note-title" aria-level="4" role="heading" id="h_note_9"><span>Note</span></div><p class="">Although <code>itts:forcedDisplay</code>, like all the TTML style attributes, has no defined semantics on a
+ <div class="note"><div class="note-title" aria-level="3" role="heading" id="h_note_9"><span>Note</span></div><p class="">Although <code>itts:forcedDisplay</code>, like all the TTML style attributes, has no defined semantics on a
<code>br</code> content element, <code>itts:forcedDisplay</code> will apply to a <code>br</code> content element if it is
either defined on an ancestor content element of the <code>br</code> content element or it is applied to a region element
corresponding to a region that the <code>br</code> content element is being flowed into.</p></div>
- <div class="note"><div class="note-title" aria-level="4" role="heading" id="h_note_10"><span>Note</span></div><p class="">It is expected that the functionality of <code>itts:forcedDisplay</code> will be mapped to a conditional
+ <div class="note"><div class="note-title" aria-level="3" role="heading" id="h_note_10"><span>Note</span></div><p class="">It is expected that the functionality of <code>itts:forcedDisplay</code> will be mapped to a conditional
style construct in a future revision of this specification.</p></div>
</section>
<section id="ttm-altText" typeof="bibo:Chapter" resource="#ttm-altText" rel="bibo:Chapter">
- <h4 aria-level="3" role="heading" id="h4_ttm-altText"><span class="secno">5.7.4 </span>ittm:altText</h4>
+ <h4 role="heading" id="h4_ttm-altText"><span class="secno">5.7.4 </span>ittm:altText</h4>
<p><code>ittm:altText</code> allows an author to provide a text string equivalent for an element, typically an image. This
text equivalent <em class="rfc2119" title="MAY">MAY</em> be used to support indexing of the content and also facilitate quality checking of the document during
@@ -925,17 +926,17 @@
<p><a href="#image-profile-constraints" class="sec-ref"><span class="secno">7.</span> <span class="sec-title">Image Profile Constraints</span></a> specifies the use of the <code>ittm:altText</code> element with images.</p>
- <div class="note"><div class="note-title" aria-level="4" role="heading" id="h_note_11"><span>Note</span></div><p class="">In contrast to the common use of <code>alt</code> attributes in [<cite><a class="bibref" href="#bib-HTML5">HTML5</a></cite>], the <code>ittm:altText</code>
+ <div class="note"><div class="note-title" aria-level="3" role="heading" id="h_note_11"><span>Note</span></div><p class="">In contrast to the common use of <code>alt</code> attributes in [<cite><a class="bibref" href="#bib-HTML5">HTML5</a></cite>], the <code>ittm:altText</code>
attribute content is not intended to be displayed in place of the element if the element is not loaded. The
<code>ittm:altText</code> attribute content can however be read and used by assistive technologies. .</p></div>
</section>
</section>
<section id="region">
- <h3 aria-level="2" role="heading" id="h3_region"><span class="secno">5.8 </span>Region</h3>
+ <h3 role="heading" id="h3_region"><span class="secno">5.8 </span>Region</h3>
<section id="presented-region">
- <h4 aria-level="3" role="heading" id="h4_presented-region"><span class="secno">5.8.1 </span>Presented Region</h4>
+ <h4 role="heading" id="h4_presented-region"><span class="secno">5.8.1 </span>Presented Region</h4>
<p>A <dfn id="dfn-presented-region">presented region</dfn> is a temporally active region that satisfies the following conditions:</p>
@@ -952,7 +953,7 @@
</section>
<section id="dimensions-and-position">
- <h4 aria-level="3" role="heading" id="h4_dimensions-and-position"><span class="secno">5.8.2 </span>Dimensions and Position</h4>
+ <h4 role="heading" id="h4_dimensions-and-position"><span class="secno">5.8.2 </span>Dimensions and Position</h4>
<p>All regions <em class="rfc2119" title="SHALL NOT">SHALL NOT</em> extend beyond the root container, i.e. the intersection of the sets of coordinates belonging to a
region (including its boundary) and the sets of coordinates belonging to the root container (including its boundary) is the
@@ -963,23 +964,21 @@
</section>
<section id="maximum-number">
- <h4 aria-level="3" role="heading" id="h4_maximum-number"><span class="secno">5.8.3 </span>Maximum number</h4>
-
- <p>The number of <a title="presented region" href="#dfn-presented-region" class="internalDFN">presented regions</a> in a given <a href="#dfn-intermediate-synchronic-document" class="internalDFN">intermediate synchronic document</a> <em class="rfc2119" title="SHALL
- NOT">SHALL
- NOT</em> be greater than 4.</p>
+ <h4 role="heading" id="h4_maximum-number"><span class="secno">5.8.3 </span>Maximum number</h4>
+
+ <p>The number of <a title="presented region" href="#dfn-presented-region" class="internalDFN">presented regions</a> in a given <a href="#dfn-intermediate-synchronic-document" class="internalDFN">intermediate synchronic document</a> <em class="rfc2119" title="SHALL NOT">SHALL NOT</em> be greater than 4.</p>
</section>
</section>
<section id="hypothetical-render-model-1">
- <h3 aria-level="2" role="heading" id="h3_hypothetical-render-model-1"><span class="secno">5.9 </span>Hypothetical Render Model</h3>
+ <h3 role="heading" id="h3_hypothetical-render-model-1"><span class="secno">5.9 </span>Hypothetical Render Model</h3>
<p>Any sequence of consecutive <a title="intermediate synchronic document" href="#dfn-intermediate-synchronic-document" class="internalDFN">intermediate synchronic documents</a> <em class="rfc2119" title="SHALL">SHALL</em> be
reproducible without error by the Hypothetical Render Model specified in Section <a href="#hypothetical-render-model" class="sec-ref"><span class="secno">8.</span> <span class="sec-title">Hypothetical Render Model</span></a>.</p>
</section>
<section id="common-features" typeof="bibo:Chapter" resource="#common-features" rel="bibo:Chapter">
- <h3 aria-level="2" role="heading" id="h3_common-features"><span class="secno">5.10 </span>Features</h3>
+ <h3 role="heading" id="h3_common-features"><span class="secno">5.10 </span>Features</h3>
<p>Unless specified otherwise,a subtitle document <em class="rfc2119" title="SHALL">SHALL</em> conform to the following:</p>
@@ -1420,17 +1419,17 @@
</tbody>
</table>
- <div class="note"><div class="note-title" aria-level="3" role="heading" id="h_note_12"><span>Note</span></div><p class="">As specified in [<cite><a class="bibref" href="#bib-TTML1">TTML1</a></cite>], a <code>#time-offset-with-frames</code> expression is translated to a media time
+ <div class="note"><div class="note-title" aria-level="2" role="heading" id="h_note_12"><span>Note</span></div><p class="">As specified in [<cite><a class="bibref" href="#bib-TTML1">TTML1</a></cite>], a <code>#time-offset-with-frames</code> expression is translated to a media time
M according to M = 3600 · hours + 60 · minutes + seconds + (frames ÷ (<code>ttp:frameRateMultiplier</code> ·
<code>ttp:frameRate</code>)).</p></div>
</section>
</section>
<section id="text-profile-constraints" typeof="bibo:Chapter" resource="#text-profile-constraints" rel="bibo:Chapter">
- <!--OddPage--><h2 aria-level="1" role="heading" id="h2_text-profile-constraints"><span class="secno">6. </span>Text Profile Constraints</h2>
+ <!--OddPage--><h2 role="heading" id="h2_text-profile-constraints"><span class="secno">6. </span>Text Profile Constraints</h2>
<section id="text-profile-designator" typeof="bibo:Chapter" resource="#text-profile-designator" rel="bibo:Chapter">
- <h3 aria-level="2" role="heading" id="h3_text-profile-designator"><span class="secno">6.1 </span>Profile Designator</h3>
+ <h3 role="heading" id="h3_text-profile-designator"><span class="secno">6.1 </span>Profile Designator</h3>
<p>This profile is associated with the following profile designator:</p>
@@ -1452,20 +1451,20 @@
</tbody>
</table>
- <div class="note"><div class="note-title" aria-level="3" role="heading" id="h_note_13"><span>Note</span></div><p class="">As specified in <a href="#common-features" class="sec-ref"><span class="secno">5.10</span> <span class="sec-title">Features</span></a>, the presence of the <code>ttp:profile</code> attribute is
+ <div class="note"><div class="note-title" aria-level="2" role="heading" id="h_note_13"><span>Note</span></div><p class="">As specified in <a href="#common-features" class="sec-ref"><span class="secno">5.10</span> <span class="sec-title">Features</span></a>, the presence of the <code>ttp:profile</code> attribute is
not required by this profile. The profile designator specified above is intended to be generally used to signal conformance
of a subtitle document to the profile. The details of such signaling depends on the application, and can, for instance, use
metadata structures out-of-band of the subtitle document.</p></div>
</section>
<section id="recommended-character-sets">
- <h3 aria-level="2" role="heading" id="h3_recommended-character-sets"><span class="secno">6.2 </span>Recommended Character Sets</h3>
+ <h3 role="heading" id="h3_recommended-character-sets"><span class="secno">6.2 </span>Recommended Character Sets</h3>
<p>Authors should select from the sets of characters specified in <a href="#recommended-unicode-code-points-per-language" class="sec-ref"><span class="secno">A.</span> <span class="sec-title">Recommended Character Sets</span></a>.</p>
</section>
<section id="features">
- <h3 aria-level="2" role="heading" id="h3_features"><span class="secno">6.3 </span>Features</h3>
+ <h3 role="heading" id="h3_features"><span class="secno">6.3 </span>Features</h3>
<p>The subtitle document <em class="rfc2119" title="SHALL">SHALL</em> conform to the following table:</p>
@@ -1784,10 +1783,10 @@
</section>
<section id="image-profile-constraints" typeof="bibo:Chapter" resource="#image-profile-constraints" rel="bibo:Chapter">
- <!--OddPage--><h2 aria-level="1" role="heading" id="h2_image-profile-constraints"><span class="secno">7. </span>Image Profile Constraints</h2>
+ <!--OddPage--><h2 role="heading" id="h2_image-profile-constraints"><span class="secno">7. </span>Image Profile Constraints</h2>
<section id="image-profile-designator" typeof="bibo:Chapter" resource="#image-profile-designator" rel="bibo:Chapter">
- <h3 aria-level="2" role="heading" id="h3_image-profile-designator"><span class="secno">7.1 </span>Profile Designator</h3>
+ <h3 role="heading" id="h3_image-profile-designator"><span class="secno">7.1 </span>Profile Designator</h3>
<p>This profile is associated with the following profile designator:</p>
@@ -1807,24 +1806,24 @@
</tbody>
</table>
- <div class="note"><div class="note-title" aria-level="3" role="heading" id="h_note_14"><span>Note</span></div><p class="">As specified in <a href="#common-features" class="sec-ref"><span class="secno">5.10</span> <span class="sec-title">Features</span></a>, the presence of the <code>ttp:profile</code> attribute is
+ <div class="note"><div class="note-title" aria-level="2" role="heading" id="h_note_14"><span>Note</span></div><p class="">As specified in <a href="#common-features" class="sec-ref"><span class="secno">5.10</span> <span class="sec-title">Features</span></a>, the presence of the <code>ttp:profile</code> attribute is
not required by this profile. The profile designator specified above is intended to be generally used to signal conformance
of a subtitle document to the profile. The details of such signaling depends on the application, and can, for instance, use
metadata structures out-of-band of the subtitle document.</p></div>
</section>
<section id="presented-image">
- <h3 aria-level="2" role="heading" id="h3_presented-image"><span class="secno">7.2 </span>Presented Image</h3>
+ <h3 role="heading" id="h3_presented-image"><span class="secno">7.2 </span>Presented Image</h3>
<section id="definition">
- <h4 aria-level="3" role="heading" id="h4_definition"><span class="secno">7.2.1 </span>Definition</h4>
+ <h4 role="heading" id="h4_definition"><span class="secno">7.2.1 </span>Definition</h4>
<p>A <dfn id="dfn-presented-image">presented image</dfn> is a <code>div</code> element with a <code>smpte:backgroundImage</code> attribute that does
not extend beyond a <a href="#dfn-presented-region" class="internalDFN">presented region</a>.</p>
</section>
<section id="number-per-region">
- <h4 aria-level="3" role="heading" id="h4_number-per-region"><span class="secno">7.2.2 </span>Number per Region</h4><!-- start CFF-TT 1.0.7 -->
+ <h4 role="heading" id="h4_number-per-region"><span class="secno">7.2.2 </span>Number per Region</h4><!-- start CFF-TT 1.0.7 -->
<p>In a given synchronic document, there shall be at most one <a href="#dfn-presented-image" class="internalDFN">presented image</a> per <a href="#dfn-presented-region" class="internalDFN">presented region</a>.</p>
<!-- end CFF-TT 1.0.7 -->
@@ -1832,7 +1831,7 @@
</section>
<section id="div-element">
- <h3 aria-level="2" role="heading" id="h3_div-element"><span class="secno">7.3 </span><code>div</code> element</h3>
+ <h3 role="heading" id="h3_div-element"><span class="secno">7.3 </span><code>div</code> element</h3>
<p>If a <code>smpte:backgroundImage</code> attribute is applied to a <code>div</code> element:</p>
@@ -1851,7 +1850,7 @@
</section>
<section id="features-1">
- <h3 aria-level="2" role="heading" id="h3_features-1"><span class="secno">7.4 </span>Features</h3>
+ <h3 role="heading" id="h3_features-1"><span class="secno">7.4 </span>Features</h3>
<p>The features included in a subtitle document <em class="rfc2119" title="SHALL">SHALL</em> conform to the Table below:</p>
@@ -2010,13 +2009,13 @@
</section>
<section id="hypothetical-render-model" typeof="bibo:Chapter" resource="#hypothetical-render-model" rel="bibo:Chapter">
- <!--OddPage--><h2 aria-level="1" role="heading" id="h2_hypothetical-render-model"><span class="secno">8. </span>Hypothetical Render Model</h2>
+ <!--OddPage--><h2 role="heading" id="h2_hypothetical-render-model"><span class="secno">8. </span>Hypothetical Render Model</h2>
<section id="performance-model">
- <h3 aria-level="2" role="heading" id="h3_performance-model"><span class="secno">8.1 </span>Performance Model</h3>
+ <h3 role="heading" id="h3_performance-model"><span class="secno">8.1 </span>Performance Model</h3>
<section id="overview">
- <h4 aria-level="3" role="heading" id="h4_overview"><span class="secno">8.1.1 </span>Overview</h4>
+ <h4 role="heading" id="h4_overview"><span class="secno">8.1.1 </span>Overview</h4>
<p>This Section specifies the Hypothetical Render Model illustrated in <a href="#fig-hypothetical-render-model" class="fig-ref">Fig. <span class="figno">1</span> <span class="fig-title">
Hypothetical Render Model
@@ -2059,7 +2058,7 @@
</section>
<section id="general-1">
- <h4 aria-level="3" role="heading" id="h4_general-1"><span class="secno">8.1.2 </span>General</h4>
+ <h4 role="heading" id="h4_general-1"><span class="secno">8.1.2 </span>General</h4>
<p>The Presentation Compositor <em class="rfc2119" title="SHALL">SHALL</em> render in Presentation Buffer P<sub>n</sub> each successive intermediate synchronic
document E<sub>n</sub> using the following steps in order:</p>
@@ -2111,7 +2110,7 @@
P<sub>n-1</sub> at the presentation time of <a href="#dfn-intermediate-synchronic-document" class="internalDFN">intermediate synchronic document</a> E<sub>n</sub>, making the latter
available for display.</p>
- <div class="note"><div class="note-title" aria-level="4" role="heading" id="h_note_15"><span>Note</span></div><p class="">It is possible for the contents of Presentation Buffer P<sub>n-1</sub> to never be displayed. This can
+ <div class="note"><div class="note-title" aria-level="3" role="heading" id="h_note_15"><span>Note</span></div><p class="">It is possible for the contents of Presentation Buffer P<sub>n-1</sub> to never be displayed. This can
happen if Presentation Buffer P<sub>n</sub> is copied twice to Presentation Buffer P<sub>n-1</sub> between two consecutive
video frame boundaries of the related video object.</p></div>
@@ -2144,15 +2143,15 @@
</tbody>
</table>
- <div class="note"><div class="note-title" aria-level="4" role="heading" id="h_note_16"><span>Note</span></div><p class="">BDraw effectively sets a limit on fillings regions - for example, assuming that the root container is
+ <div class="note"><div class="note-title" aria-level="3" role="heading" id="h_note_16"><span>Note</span></div><p class="">BDraw effectively sets a limit on fillings regions - for example, assuming that the root container is
ultimately rendered at 1920×1080 resolution, a BDraw of 12 s<sup>-1</sup> would correspond to a fill rate of
1920×1080×12/s=23.7×2<sup>20</sup>pixels s<sup>-1</sup>.</p></div>
- <div class="note"><div class="note-title" aria-level="4" role="heading" id="h_note_17"><span>Note</span></div><p class="">IPD effectively sets a limit on the complexity of any given <a href="#dfn-intermediate-synchronic-document" class="internalDFN">intermediate synchronic document</a>.</p></div>
+ <div class="note"><div class="note-title" aria-level="3" role="heading" id="h_note_17"><span>Note</span></div><p class="">IPD effectively sets a limit on the complexity of any given <a href="#dfn-intermediate-synchronic-document" class="internalDFN">intermediate synchronic document</a>.</p></div>
</section>
<section id="paint-regions" typeof="bibo:Chapter" resource="#paint-regions" rel="bibo:Chapter">
- <h4 aria-level="3" role="heading" id="h4_paint-regions"><span class="secno">8.1.3 </span>Paint Regions</h4>
+ <h4 role="heading" id="h4_paint-regions"><span class="secno">8.1.3 </span>Paint Regions</h4>
<p>The total normalized drawing area S(E<sub>n</sub>) for <a href="#dfn-intermediate-synchronic-document" class="internalDFN">intermediate synchronic document</a> E<sub>n</sub> <em class="rfc2119" title="SHALL">SHALL</em>
be</p>
@@ -2161,7 +2160,7 @@
<p>where CLEAR(E<sub>0</sub>) = 0 and CLEAR(E<sub>n | n > 0</sub>) = 1, i.e. the root container in its entirety.</p>
- <div class="note"><div class="note-title" aria-level="4" role="heading" id="h_note_18"><span>Note</span></div><p class="">To ensure consistency of the Presentation Buffer, a new <a href="#dfn-intermediate-synchronic-document" class="internalDFN">intermediate synchronic document</a> requires
+ <div class="note"><div class="note-title" aria-level="3" role="heading" id="h_note_18"><span>Note</span></div><p class="">To ensure consistency of the Presentation Buffer, a new <a href="#dfn-intermediate-synchronic-document" class="internalDFN">intermediate synchronic document</a> requires
clearing of the root container.</p></div>
<p>PAINT(E<sub>n</sub>) <em class="rfc2119" title="SHALL">SHALL</em> be the normalized area to be painted for all regions that are used in intermediate synchronic
@@ -2207,7 +2206,7 @@
</section>
<section id="paint-images" typeof="bibo:Chapter" resource="#paint-images" rel="bibo:Chapter">
- <h4 aria-level="3" role="heading" id="h4_paint-images"><span class="secno">8.1.4 </span>Paint Images</h4>
+ <h4 role="heading" id="h4_paint-images"><span class="secno">8.1.4 </span>Paint Images</h4>
<p>The Presentation Compositor <em class="rfc2119" title="SHALL">SHALL</em> paint into the Presentation Buffer P<sub>n</sub> all visible pixels of presented
images of <a href="#dfn-intermediate-synchronic-document" class="internalDFN">intermediate synchronic document</a> E<sub>n</sub>.</p>
@@ -2299,7 +2298,7 @@
</section>
<section id="paint-text" typeof="bibo:Chapter" resource="#paint-text" rel="bibo:Chapter">
- <h4 aria-level="3" role="heading" id="h4_paint-text"><span class="secno">8.1.5 </span>Paint Text</h4>
+ <h4 role="heading" id="h4_paint-text"><span class="secno">8.1.5 </span>Paint Text</h4>
<p>For each glyph displayed in <a href="#dfn-intermediate-synchronic-document" class="internalDFN">intermediate synchronic document</a> E<sub>n</sub>, the Presentation Compositor
<em class="rfc2119" title="SHALL">SHALL</em>:</p>
@@ -2364,9 +2363,7 @@
<li>GCpy is the normalized glyph copy performance factor</li>
</ul>
- <p>G<sub>r</sub> and G<sub>c</sub> <em class="rfc2119" title="SHALL">SHALL</em> include only glyphs in <a title="presented region" href="#dfn-presented-region" class="internalDFN">presented regions</a> and <em class="rfc2119" title="SHALL
- NOT">SHALL
- NOT</em> include a [<cite><a class="bibref" href="#bib-UNICODE">UNICODE</a></cite>] Code Point if it does not result in a change to presentation, e.g. the Code Point is
+ <p>G<sub>r</sub> and G<sub>c</sub> <em class="rfc2119" title="SHALL">SHALL</em> include only glyphs in <a title="presented region" href="#dfn-presented-region" class="internalDFN">presented regions</a> and <em class="rfc2119" title="SHALL NOT">SHALL NOT</em> include a [<cite><a class="bibref" href="#bib-UNICODE">UNICODE</a></cite>] Code Point if it does not result in a change to presentation, e.g. the Code Point is
ignored.</p>
<p>The Normalized Rendered Glyph Area NRGA(G<sub>i</sub>) of a glyph G<sub>i</sub> <em class="rfc2119" title="SHALL">SHALL</em> be equal to:</p>
@@ -2422,7 +2419,7 @@
</tbody>
</table>
- <div class="note"><div class="note-title" aria-level="4" role="heading" id="h_note_19"><span>Note</span></div><p class="">NRGA(G<sub>i</sub>) does not take into account glyph decorations (e.g. underline), glyph effects (e.g.
+ <div class="note"><div class="note-title" aria-level="3" role="heading" id="h_note_19"><span>Note</span></div><p class="">NRGA(G<sub>i</sub>) does not take into account glyph decorations (e.g. underline), glyph effects (e.g.
outline) or actual glyph aspect ratio. An implementation can determine an actual buffer size needs based on worst-case
glyph size complexity.</p></div>
@@ -2451,7 +2448,7 @@
</section><!-- start CFF-TT 1.0.7 -->
<section id="reference-fonts">
- <h3 aria-level="2" role="heading" id="h3_reference-fonts"><span class="secno">8.2 </span>Reference Fonts</h3>
+ <h3 role="heading" id="h3_reference-fonts"><span class="secno">8.2 </span>Reference Fonts</h3>
<p>The height and width of the area occupied by text within a region depend on line height as well as the width of, and
spacing between (kerning), individual glyphs. The following allows the area occupied by text to be closely determined, and
@@ -2503,15 +2500,15 @@
</tbody>
</table>
- <div class="note"><div class="note-title" aria-level="3" role="heading" id="h_note_20"><span>Note</span></div><p class="">Implementations can use use fonts other than those specified above. Two fonts with equal metrics can have a
+ <div class="note"><div class="note-title" aria-level="2" role="heading" id="h_note_20"><span>Note</span></div><p class="">Implementations can use use fonts other than those specified above. Two fonts with equal metrics can have a
different appearance, but flow identically.</p></div>
- <div class="note"><div class="note-title" aria-level="3" role="heading" id="h_note_21"><span>Note</span></div><p class="">proportionalSansSerif is not used in practice for Hebrew and Arabic captions and subtitles.</p></div>
+ <div class="note"><div class="note-title" aria-level="2" role="heading" id="h_note_21"><span>Note</span></div><p class="">proportionalSansSerif is not used in practice for Hebrew and Arabic captions and subtitles.</p></div>
</section>
</section>
<section class="appendix" id="recommended-unicode-code-points-per-language" typeof="bibo:Chapter" resource="#recommended-unicode-code-points-per-language" rel="bibo:Chapter">
- <!--OddPage--><h2 aria-level="1" role="heading" id="h2_recommended-unicode-code-points-per-language"><span class="secno">A. </span>Recommended Character Sets</h2>
+ <!--OddPage--><h2 role="heading" id="h2_recommended-unicode-code-points-per-language"><span class="secno">A. </span>Recommended Character Sets</h2>
<p>When authoring textual content, authors are encouraged to select from sets of characters based on the language indicated
using <code>xml:lang</code>. The idea is to increase the confidence that the text will be presented correctly by
@@ -2849,7 +2846,7 @@
</section>
<section class="appendix" id="forced-content" typeof="bibo:Chapter" resource="#forced-content" rel="bibo:Chapter">
- <!--OddPage--><h2 aria-level="1" role="heading" id="h2_forced-content"><span class="secno">B. </span>Forced content (non-normative)</h2>
+ <!--OddPage--><h2 role="heading" id="h2_forced-content"><span class="secno">B. </span>Forced content (non-normative)</h2>
<p><a href="#fig-forced-content" class="fig-ref">Fig. <span class="figno">3</span> <span class="fig-title">
Illustration of the use of itts:forcedDisplay
@@ -2878,7 +2875,7 @@
</section>
<section class="appendix" id="wcag-applications" typeof="bibo:Chapter" resource="#wcag-applications" rel="bibo:Chapter">
- <!--OddPage--><h2 aria-level="1" role="heading" id="h2_wcag-applications"><span class="secno">C. </span>WCAG Considerations</h2>
+ <!--OddPage--><h2 role="heading" id="h2_wcag-applications"><span class="secno">C. </span>WCAG Considerations</h2>
<p>In order to meet the guidelines in [<cite><a class="bibref" href="#bib-WCAG20">WCAG20</a></cite>], the following considerations apply.</p>
@@ -2908,17 +2905,17 @@
</section>
<section class="appendix" id="features-and-extensions" typeof="bibo:Chapter" resource="#features-and-extensions" rel="bibo:Chapter">
- <!--OddPage--><h2 aria-level="1" role="heading" id="h2_features-and-extensions"><span class="secno">D. </span>Extensions</h2>
+ <!--OddPage--><h2 role="heading" id="h2_features-and-extensions"><span class="secno">D. </span>Extensions</h2>
<section class="appendix" id="general-2">
- <h3 aria-level="2" role="heading" id="h3_general-2"><span class="secno">D.1 </span>General</h3>
+ <h3 role="heading" id="h3_general-2"><span class="secno">D.1 </span>General</h3>
<p>The following sections define extension designations, expressed as relative URIs (fragment identifiers) relative to the
IMSC 1.0 Extension Namespace base URI.</p>
</section>
<section class="appendix" id="progressivelydecodable">
- <h3 aria-level="2" role="heading" id="h3_progressivelydecodable"><span class="secno">D.2 </span>#progressivelyDecodable</h3>
+ <h3 role="heading" id="h3_progressivelydecodable"><span class="secno">D.2 </span>#progressivelyDecodable</h3>
<p>A <a href="#dfn-transformation-processor" class="internalDFN">transformation processor</a> supports the <code>#progressivelyDecodable</code> feature if it recognizes and is
capable of transforming values of the <a href="#ttp-progressivelyDecodable"><code>ittp:progressivelyDecodable</code></a>.</p>
@@ -2929,7 +2926,7 @@
</section>
<section class="appendix" id="aspectratio">
- <h3 aria-level="2" role="heading" id="h3_aspectratio"><span class="secno">D.3 </span>#aspectRatio</h3>
+ <h3 role="heading" id="h3_aspectratio"><span class="secno">D.3 </span>#aspectRatio</h3>
<p>A <a href="#dfn-transformation-processor" class="internalDFN">transformation processor</a> supports the <code>#aspectRatio</code> feature if it recognizes and is capable of
transforming values of the <a href="#ttp-aspectRatio"><code>ittp:aspectRatio</code></a>.</p>
@@ -2939,7 +2936,7 @@
</section>
<section class="appendix" id="forceddisplay">
- <h3 aria-level="2" role="heading" id="h3_forceddisplay"><span class="secno">D.4 </span>#forcedDisplay</h3>
+ <h3 role="heading" id="h3_forceddisplay"><span class="secno">D.4 </span>#forcedDisplay</h3>
<p>A <a href="#dfn-transformation-processor" class="internalDFN">transformation processor</a> supports the <code>#forcedDisplay</code> feature if it recognizes and is capable of
transforming values of the <a href="#tts-forcedDisplay"><code>itts:forcedDisplay</code></a>.</p>
@@ -2949,7 +2946,7 @@
</section>
<section class="appendix" id="alttext">
- <h3 aria-level="2" role="heading" id="h3_alttext"><span class="secno">D.5 </span>#altText</h3>
+ <h3 role="heading" id="h3_alttext"><span class="secno">D.5 </span>#altText</h3>
<p>A <a href="#dfn-transformation-processor" class="internalDFN">transformation processor</a> supports the <code>#altText</code> feature if it recognizes and is capable of
transforming values of the <a href="#ttm-altText"><code>ittm:altText</code></a> element.</p>
@@ -2959,7 +2956,7 @@
</section>
<section class="appendix" id="linepadding">
- <h3 aria-level="2" role="heading" id="h3_linepadding"><span class="secno">D.6 </span>#linePadding</h3>
+ <h3 role="heading" id="h3_linepadding"><span class="secno">D.6 </span>#linePadding</h3>
<p>A <a href="#dfn-transformation-processor" class="internalDFN">transformation processor</a> supports the <code>#linePadding</code> feature if it recognizes and is capable of
transforming values of the <code>ebutts:linePadding</code> attribute specified in [<cite><a class="bibref" href="#bib-EBU-TT-D">EBU-TT-D</a></cite>].</p>
@@ -2969,7 +2966,7 @@
</section>
<section class="appendix" id="multirowalign">
- <h3 aria-level="2" role="heading" id="h3_multirowalign"><span class="secno">D.7 </span>#multiRowAlign</h3>
+ <h3 role="heading" id="h3_multirowalign"><span class="secno">D.7 </span>#multiRowAlign</h3>
<p>A <a href="#dfn-transformation-processor" class="internalDFN">transformation processor</a> supports the <code>#multiRowAlign</code> feature if it recognizes and is capable of
transforming values of the <code>ebutts:multiRowAlign</code> attribute specified in [<cite><a class="bibref" href="#bib-EBU-TT-D">EBU-TT-D</a></cite>].</p>
@@ -2980,7 +2977,7 @@
</section>
-<section id="references" class="appendix" typeof="bibo:Chapter" resource="#references" rel="bibo:Chapter"><!--OddPage--><h2 aria-level="1" role="heading" id="h2_references"><span class="secno">E. </span>References</h2><section id="normative-references" typeof="bibo:Chapter" resource="#normative-references" rel="bibo:Chapter"><h3 aria-level="2" role="heading" id="h3_normative-references"><span class="secno">E.1 </span>Normative references</h3><dl class="bibliography" about=""><dt id="bib-CLDR">[CLDR]</dt><dd rel="dcterms:requires">Unicode Consortium. <a href="http://cldr.unicode.org">The Common Locale Data Repository Project</a>
+<section id="references" class="appendix" typeof="bibo:Chapter" resource="#references" rel="bibo:Chapter"><!--OddPage--><h2 role="heading" id="h2_references"><span class="secno">E. </span>References</h2><section id="normative-references" typeof="bibo:Chapter" resource="#normative-references" rel="bibo:Chapter"><h3 role="heading" id="h3_normative-references"><span class="secno">E.1 </span>Normative references</h3><dl class="bibliography" about=""><dt id="bib-CLDR">[CLDR]</dt><dd rel="dcterms:requires">Unicode Consortium. <a href="http://cldr.unicode.org">The Common Locale Data Repository Project</a>
</dd><dt id="bib-EBU-TT-D">[EBU-TT-D]</dt><dd rel="dcterms:requires">European Broadcasting Union (EBU). <a href="https://tech.ebu.ch/docs/tech/tech3380.pdf">Tech 3380, EBU-TT-D Subtitling Distribution Format Version 1.0</a>
</dd><dt id="bib-MHP">[MHP]</dt><dd rel="dcterms:requires">ETSI TS 101 812 V1.3.1, Digital Video Broadcasting (DVB); Multimedia Home
</dd><dt id="bib-RFC2119">[RFC2119]</dt><dd rel="dcterms:requires">S. Bradner. <a href="http://www.ietf.org/rfc/rfc2119.txt"><cite>Key words for use in RFCs to Indicate Requirement Levels</cite></a>. March 1997. Best Current Practice. URL: <a href="http://www.ietf.org/rfc/rfc2119.txt">http://www.ietf.org/rfc/rfc2119.txt</a>
@@ -2989,7 +2986,7 @@
</dd><dt id="bib-UNICODE">[UNICODE]</dt><dd rel="dcterms:requires"><a href="http://www.unicode.org/versions/latest/"><cite>The Unicode Standard</cite></a>. URL: <a href="http://www.unicode.org/versions/latest/">http://www.unicode.org/versions/latest/</a>
</dd><dt id="bib-WCAG20">[WCAG20]</dt><dd rel="dcterms:requires">Ben Caldwell; Michael Cooper; Loretta Guarino Reid; Gregg Vanderheiden et al. <a href="http://www.w3.org/TR/WCAG20/"><cite>Web Content Accessibility Guidelines (WCAG) 2.0</cite></a>. 11 December 2008. W3C Recommendation. URL: <a href="http://www.w3.org/TR/WCAG20/">http://www.w3.org/TR/WCAG20/</a>
</dd><dt id="bib-xml-names">[xml-names]</dt><dd rel="dcterms:requires">Tim Bray; Dave Hollander; Andrew Layman; Richard Tobin; Henry Thompson et al. <a href="http://www.w3.org/TR/xml-names"><cite>Namespaces in XML 1.0 (Third Edition)</cite></a>. 8 December 2009. W3C Recommendation. URL: <a href="http://www.w3.org/TR/xml-names">http://www.w3.org/TR/xml-names</a>
-</dd></dl></section><section id="informative-references" typeof="bibo:Chapter" resource="#informative-references" rel="bibo:Chapter"><h3 aria-level="2" role="heading" id="h3_informative-references"><span class="secno">E.2 </span>Informative references</h3><dl class="bibliography" about=""><dt id="bib-CEA-608">[CEA-608]</dt><dd rel="dcterms:references"><a href="http://www.ce.org/Standards/Standard-Listings/R4-3-Television-Data-Systems-Subcommittee/Line-21-Data-Service.aspx">Line-21 Data Services</a>, ANSI/CEA Standard.
+</dd></dl></section><section id="informative-references" typeof="bibo:Chapter" resource="#informative-references" rel="bibo:Chapter"><h3 role="heading" id="h3_informative-references"><span class="secno">E.2 </span>Informative references</h3><dl class="bibliography" about=""><dt id="bib-CEA-608">[CEA-608]</dt><dd rel="dcterms:references"><a href="http://www.ce.org/Standards/Standard-Listings/R4-3-Television-Data-Systems-Subcommittee/Line-21-Data-Service.aspx">Line-21 Data Services</a>, ANSI/CEA Standard.
</dd><dt id="bib-CEA-708">[CEA-708]</dt><dd rel="dcterms:references"><a href="http://www.ce.org/Standards/Standard-Listings/R4-3-Television-Data-Systems-Subcommittee/CEA-708-D.aspx">Digital Television (DTV) Closed Captioning</a>, ANSI/CEA Standard.
</dd><dt id="bib-HTML5">[HTML5]</dt><dd rel="dcterms:references">Robin Berjon; Steve Faulkner; Travis Leithead; Erika Doyle Navara; Edward O'Connor; Silvia Pfeiffer. <a href="http://www.w3.org/TR/html5/"><cite>HTML5</cite></a>. 16 September 2014. W3C Proposed Recommendation. URL: <a href="http://www.w3.org/TR/html5/">http://www.w3.org/TR/html5/</a>
</dd><dt id="bib-SDPUS">[SDPUS]</dt><dd rel="dcterms:references">World Wide Web Consortium (W3C). <a href="http://www.w3.org/TR/ttml10-sdp-us/">TTML Simple Delivery Profile for Closed Captions (US)</a> (W3C Working Group Note, 05 February 2013)