[imsc] address ISSUE-364
authorplemieux
Wed, 21 Jan 2015 22:05:22 -0800
changeset 850 bac9bced3061
parent 849 b09c35d2aa4a
child 851 46a91ba16236
[imsc] address ISSUE-364
ttml-ww-profiles/ttml-ww-profiles.html
ttml-ww-profiles/ttml-ww-profiles.source.html
--- a/ttml-ww-profiles/ttml-ww-profiles.html	Sun Jan 18 10:50:17 2015 -0700
+++ b/ttml-ww-profiles/ttml-ww-profiles.html	Wed Jan 21 22:05:22 2015 -0800
@@ -1,6 +1,6 @@
 <!DOCTYPE html>
-<html lang="en" dir="ltr" typeof="bibo:Document " about="" property="dcterms:language" content="en">
-<head>
+<html lang="en" dir="ltr" typeof="bibo:Document " prefix="bibo: http://purl.org/ontology/bibo/ w3p: http://www.w3.org/2001/02pd/rec54#">
+<head><meta lang="" property="dc:language" content="en">
   <meta charset="utf-8">
 
   <title>TTML Text and Image Profiles for Internet Media Subtitles and Captions 1.0</title>
@@ -173,33 +173,34 @@
     color: #999;
 }
 </style><style>/* --- ISSUES/NOTES --- */
-div.issue-title, div.note-title {
+div.issue-title, div.note-title , div.warning-title {
     padding-right:  1em;
     min-width: 7.5em;
     color: #b9ab2d;
 }
 div.issue-title { color: #e05252; }
 div.note-title { color: #2b2; }
-div.issue-title span, div.note-title span {
+div.warning-title { color: #f22; }
+div.issue-title span, div.note-title span, div.warning-title span {
     text-transform: uppercase;
 }
-div.note, div.issue {
+div.note, div.issue, div.warning {
     margin-top: 1em;
     margin-bottom: 1em;
 }
-.note > p:first-child, .issue > p:first-child { margin-top: 0 }
-.issue, .note {
+.note > p:first-child, .issue > p:first-child, .warning > p:first-child { margin-top: 0 }
+.issue, .note, .warning {
     padding: .5em;
     border-left-width: .5em;
     border-left-style: solid;
 }
-div.issue, div.note {
+div.issue, div.note , div.warning {
     padding: 1em 1.2em 0.5em;
     margin: 1em 0;
     position: relative;
     clear: both;
 }
-span.note, span.issue { padding: .1em .5em .15em; }
+span.note, span.issue, span.warning { padding: .1em .5em .15em; }
 
 .issue {
     border-color: #e05252;
@@ -210,7 +211,24 @@
     background: #e9fbe9;
 }
 
-
+.warning {
+    border-color: #f11;
+    border-right-width: .2em;
+    border-top-width: .2em;
+    border-bottom-width: .2em;
+    border-style: solid;
+    background: #fbe9e9;
+}
+
+.warning-title:before{
+    content: "⚠"; /*U+26A0 WARNING SIGN*/
+    font-size: 3em;
+    float: left;
+    height: 100%;
+    padding-right: .3em;
+    vertical-align: top;
+    margin-top: -0.5em;
+}
 </style><link rel="stylesheet" href="https://www.w3.org/StyleSheets/TR/W3C-ED"><!--[if lt IE 9]><script src='https://www.w3.org/2008/site/js/html5shiv.js'></script><![endif]--></head>
 
 <body class="h-entry" role="document" id="respecDocument"><div class="head" role="contentinfo" id="respecHeader">
@@ -223,7 +241,7 @@
   </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="2014-12-17T19:33:22.000Z" id="w3c-editor-s-draft-17-december-2014"><abbr title="World Wide Web Consortium">W3C</abbr> Editor's Draft <time class="dt-published" datetime="2014-12-17">17 December 2014</time></h2>
+  <h2 id="w3c-editor-s-draft-21-january-2015"><abbr title="World Wide Web Consortium">W3C</abbr> Editor's Draft <time property="dcterms:issued" class="dt-published" datetime="2015-01-21">21 January 2015</time></h2>
   <dl>
     
       <dt>This version:</dt>
@@ -247,7 +265,8 @@
     
     
     <dt>Editor:</dt>
-    <dd class="p-author h-card vcard" rel="bibo:editor" inlist=""><span typeof="foaf:Person"><span property="foaf:name" class="p-name fn">Pierre Lemieux</span>, <span class="ed_mailto"><a class="u-email email" rel="foaf:mbox" href="mailto:[email protected]">[email protected]</a></span></span>
+    <dd class="p-author h-card vcard" property="bibo:editor" resource="_:editor0"><span property="rdf:first" typeof="foaf:Person"><span property="foaf:name" class="p-name fn">Pierre Lemieux</span>, <span class="ed_mailto"><a class="u-email email" property="foaf:mbox" href="mailto:[email protected]">[email protected]</a></span></span>
+<span property="rdf:rest" resource="rdf:nil"></span>
 </dd>
 
     
@@ -260,7 +279,7 @@
     
       <p class="copyright">
         <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> ©
-        2014
+        2015
         
         <a href="http://www.w3.org/"><abbr title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup>
         (<a href="http://www.csail.mit.edu/"><abbr title="Massachusetts Institute of Technology">MIT</abbr></a>,
@@ -280,7 +299,7 @@
   
   <hr>
 </div>
-  <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>
+  <section id="abstract" class="introductory" property="dc:abstract"><h2 id="h-abstract" resource="#h-abstract"><span property="xhv:role" resource="xhv:heading">Abstract</span></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
@@ -290,7 +309,7 @@
     [<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 role="heading" id="h2_sotd">Status of This Document</h2>
+  </section><section id="sotd" class="introductory"><h2 id="h-sotd" resource="#h-sotd"><span property="xhv:role" resource="xhv:heading">Status of This Document</span></h2>
   
     
       
@@ -353,7 +372,7 @@
         <p>
           
             This document was produced by a group operating under the 
-            <a id="sotd_patent" about="" rel="w3p:patentRules" href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5 February 2004 <abbr title="World Wide Web Consortium">W3C</abbr> Patent
+            <a id="sotd_patent" property="w3p:patentRules" href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5 February 2004 <abbr title="World Wide Web Consortium">W3C</abbr> Patent
             Policy</a>.
           
           
@@ -380,12 +399,12 @@
       
     
   
-</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="#conventions" class="tocxref"><span class="secno">2. </span>Documentation Conventions</a></li><li class="tocline"><a href="#terms" class="tocxref"><span class="secno">3. </span>Terms and Definitions</a></li><li class="tocline"><a href="#conformance" class="tocxref"><span class="secno">4. </span>Conformance</a></li><li class="tocline"><a href="#profiles" class="tocxref"><span class="secno">5. </span>Profiles</a><ul class="toc"><li class="tocline"><a href="#general" class="tocxref"><span class="secno">5.1 </span>General</a></li><li class="tocline"><a href="#text-profile" class="tocxref"><span class="secno">5.2 </span>Text Profile</a></li><li class="tocline"><a href="#image-profile" class="tocxref"><span class="secno">5.3 </span>Image Profile</a></li></ul></li><li class="tocline"><a href="#common-constraints" class="tocxref"><span class="secno">6. </span>Common Constraints</a><ul class="toc"><li class="tocline"><a href="#document-encoding" class="tocxref"><span class="secno">6.1 </span>Document Encoding</a></li><li class="tocline"><a href="#foreign-element-and-attributes" class="tocxref"><span class="secno">6.2 </span>Foreign Element and Attributes</a></li><li class="tocline"><a href="#namespaces" class="tocxref"><span class="secno">6.3 </span>Namespaces</a></li><li class="tocline"><a href="#overflow" class="tocxref"><span class="secno">6.4 </span>Overflow</a></li><li class="tocline"><a href="#related-video-object" class="tocxref"><span class="secno">6.5 </span>Related Video Object</a></li><li class="tocline"><a href="#synchronization" class="tocxref"><span class="secno">6.6 </span>Synchronization</a></li><li class="tocline"><a href="#extensions" class="tocxref"><span class="secno">6.7 </span>Extensions</a><ul class="toc"><li class="tocline"><a href="#ttp-aspectRatio" class="tocxref"><span class="secno">6.7.1 </span>ittp:aspectRatio</a></li><li class="tocline"><a href="#ttp-progressivelyDecodable" class="tocxref"><span class="secno">6.7.2 </span>ittp:progressivelyDecodable</a></li><li class="tocline"><a href="#tts-forcedDisplay" class="tocxref"><span class="secno">6.7.3 </span>itts:forcedDisplay</a></li><li class="tocline"><a href="#ttm-altText" class="tocxref"><span class="secno">6.7.4 </span>ittm:altText</a></li></ul></li><li class="tocline"><a href="#region" class="tocxref"><span class="secno">6.8 </span>Region</a><ul class="toc"><li class="tocline"><a href="#presented-region" class="tocxref"><span class="secno">6.8.1 </span>Presented Region</a></li><li class="tocline"><a href="#dimensions-and-position" class="tocxref"><span class="secno">6.8.2 </span>Dimensions and Position</a></li><li class="tocline"><a href="#maximum-number" class="tocxref"><span class="secno">6.8.3 </span>Maximum number</a></li></ul></li><li class="tocline"><a href="#hypothetical-render-model-1" class="tocxref"><span class="secno">6.9 </span>Hypothetical Render Model</a></li><li class="tocline"><a href="#common-features" class="tocxref"><span class="secno">6.10 </span>Features</a></li></ul></li><li class="tocline"><a href="#text-profile-constraints" class="tocxref"><span class="secno">7. </span>Text Profile Constraints</a><ul class="toc"><li class="tocline"><a href="#text-profile-designator" class="tocxref"><span class="secno">7.1 </span>Profile Designator</a></li><li class="tocline"><a href="#recommended-character-sets" class="tocxref"><span class="secno">7.2 </span>Recommended Character Sets</a></li><li class="tocline"><a href="#reference-fonts-1" class="tocxref"><span class="secno">7.3 </span>Reference Fonts</a></li><li class="tocline"><a href="#features" class="tocxref"><span class="secno">7.4 </span>Features</a></li></ul></li><li class="tocline"><a href="#image-profile-constraints" class="tocxref"><span class="secno">8. </span>Image Profile Constraints</a><ul class="toc"><li class="tocline"><a href="#image-profile-designator" class="tocxref"><span class="secno">8.1 </span>Profile Designator</a></li><li class="tocline"><a href="#presented-image" class="tocxref"><span class="secno">8.2 </span>Presented Image</a><ul class="toc"><li class="tocline"><a href="#definition" class="tocxref"><span class="secno">8.2.1 </span>Definition</a></li><li class="tocline"><a href="#number-per-region" class="tocxref"><span class="secno">8.2.2 </span>Number per Region</a></li></ul></li><li class="tocline"><a href="#div-element" class="tocxref"><span class="secno">8.3 </span><code>div</code> element</a></li><li class="tocline"><a href="#features-1" class="tocxref"><span class="secno">8.4 </span>Features</a></li></ul></li><li class="tocline"><a href="#hypothetical-render-model" class="tocxref"><span class="secno">9. </span>Hypothetical Render Model</a><ul class="toc"><li class="tocline"><a href="#overview" class="tocxref"><span class="secno">9.1 </span>Overview</a></li><li class="tocline"><a href="#general-1" class="tocxref"><span class="secno">9.2 </span>General</a></li><li class="tocline"><a href="#paint-regions" class="tocxref"><span class="secno">9.3 </span>Paint Regions</a></li><li class="tocline"><a href="#paint-images" class="tocxref"><span class="secno">9.4 </span>Paint Images</a></li><li class="tocline"><a href="#paint-text" class="tocxref"><span class="secno">9.5 </span>Paint Text</a></li></ul></li><li class="tocline"><a href="#reference-fonts" class="tocxref"><span class="secno">A. </span>Reference Fonts</a></li><li class="tocline"><a href="#recommended-unicode-code-points-per-language" class="tocxref"><span class="secno">B. </span>Recommended Character Sets</a></li><li class="tocline"><a href="#forced-content" class="tocxref"><span class="secno">C. </span>Forced content (non-normative)</a></li><li class="tocline"><a href="#wcag-applications" class="tocxref"><span class="secno">D. </span>WCAG Considerations</a></li><li class="tocline"><a href="#sample-instance" class="tocxref"><span class="secno">E. </span>Sample Document Instance (non-normative)</a></li><li class="tocline"><a href="#features-and-extensions" class="tocxref"><span class="secno">F. </span>Extensions</a><ul class="toc"><li class="tocline"><a href="#general-2" class="tocxref"><span class="secno">F.1 </span>General</a></li><li class="tocline"><a href="#progressivelydecodable" class="tocxref"><span class="secno">F.2 </span>#progressivelyDecodable</a></li><li class="tocline"><a href="#aspectratio" class="tocxref"><span class="secno">F.3 </span>#aspectRatio</a></li><li class="tocline"><a href="#forceddisplay" class="tocxref"><span class="secno">F.4 </span>#forcedDisplay</a></li><li class="tocline"><a href="#alttext" class="tocxref"><span class="secno">F.5 </span>#altText</a></li><li class="tocline"><a href="#linepadding" class="tocxref"><span class="secno">F.6 </span>#linePadding</a></li><li class="tocline"><a href="#multirowalign" class="tocxref"><span class="secno">F.7 </span>#multiRowAlign</a></li></ul></li><li class="tocline"><a href="#references" class="tocxref"><span class="secno">G. </span>References</a><ul class="toc"><li class="tocline"><a href="#normative-references" class="tocxref"><span class="secno">G.1 </span>Normative references</a></li><li class="tocline"><a href="#informative-references" class="tocxref"><span class="secno">G.2 </span>Informative references</a></li></ul></li></ul></section>
+</section><section id="toc"><h2 class="introductory" id="h-toc" resource="#h-toc"><span property="xhv:role" resource="xhv:heading">Table of Contents</span></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="#conventions" class="tocxref"><span class="secno">2. </span>Documentation Conventions</a></li><li class="tocline"><a href="#terms" class="tocxref"><span class="secno">3. </span>Terms and Definitions</a></li><li class="tocline"><a href="#conformance" class="tocxref"><span class="secno">4. </span>Conformance</a></li><li class="tocline"><a href="#profiles" class="tocxref"><span class="secno">5. </span>Profiles</a><ul class="toc"><li class="tocline"><a href="#general" class="tocxref"><span class="secno">5.1 </span>General</a></li><li class="tocline"><a href="#text-profile" class="tocxref"><span class="secno">5.2 </span>Text Profile</a></li><li class="tocline"><a href="#image-profile" class="tocxref"><span class="secno">5.3 </span>Image Profile</a></li></ul></li><li class="tocline"><a href="#common-constraints" class="tocxref"><span class="secno">6. </span>Common Constraints</a><ul class="toc"><li class="tocline"><a href="#document-encoding" class="tocxref"><span class="secno">6.1 </span>Document Encoding</a></li><li class="tocline"><a href="#foreign-element-and-attributes" class="tocxref"><span class="secno">6.2 </span>Foreign Element and Attributes</a></li><li class="tocline"><a href="#namespaces" class="tocxref"><span class="secno">6.3 </span>Namespaces</a></li><li class="tocline"><a href="#overflow" class="tocxref"><span class="secno">6.4 </span>Overflow</a></li><li class="tocline"><a href="#related-video-object" class="tocxref"><span class="secno">6.5 </span>Related Video Object</a></li><li class="tocline"><a href="#synchronization" class="tocxref"><span class="secno">6.6 </span>Synchronization</a></li><li class="tocline"><a href="#extensions" class="tocxref"><span class="secno">6.7 </span>Extensions</a><ul class="toc"><li class="tocline"><a href="#ttp-aspectRatio" class="tocxref"><span class="secno">6.7.1 </span>ittp:aspectRatio</a></li><li class="tocline"><a href="#ttp-progressivelyDecodable" class="tocxref"><span class="secno">6.7.2 </span>ittp:progressivelyDecodable</a></li><li class="tocline"><a href="#tts-forcedDisplay" class="tocxref"><span class="secno">6.7.3 </span>itts:forcedDisplay</a></li><li class="tocline"><a href="#ttm-altText" class="tocxref"><span class="secno">6.7.4 </span>ittm:altText</a></li></ul></li><li class="tocline"><a href="#region" class="tocxref"><span class="secno">6.8 </span>Region</a><ul class="toc"><li class="tocline"><a href="#presented-region" class="tocxref"><span class="secno">6.8.1 </span>Presented Region</a></li><li class="tocline"><a href="#dimensions-and-position" class="tocxref"><span class="secno">6.8.2 </span>Dimensions and Position</a></li><li class="tocline"><a href="#maximum-number" class="tocxref"><span class="secno">6.8.3 </span>Maximum number</a></li></ul></li><li class="tocline"><a href="#hypothetical-render-model-1" class="tocxref"><span class="secno">6.9 </span>Hypothetical Render Model</a></li><li class="tocline"><a href="#common-features" class="tocxref"><span class="secno">6.10 </span>Features</a></li></ul></li><li class="tocline"><a href="#text-profile-constraints" class="tocxref"><span class="secno">7. </span>Text Profile Constraints</a><ul class="toc"><li class="tocline"><a href="#text-profile-designator" class="tocxref"><span class="secno">7.1 </span>Profile Designator</a></li><li class="tocline"><a href="#recommended-character-sets" class="tocxref"><span class="secno">7.2 </span>Recommended Character Sets</a></li><li class="tocline"><a href="#reference-fonts-1" class="tocxref"><span class="secno">7.3 </span>Reference Fonts</a></li><li class="tocline"><a href="#features" class="tocxref"><span class="secno">7.4 </span>Features</a></li></ul></li><li class="tocline"><a href="#image-profile-constraints" class="tocxref"><span class="secno">8. </span>Image Profile Constraints</a><ul class="toc"><li class="tocline"><a href="#image-profile-designator" class="tocxref"><span class="secno">8.1 </span>Profile Designator</a></li><li class="tocline"><a href="#presented-image" class="tocxref"><span class="secno">8.2 </span>Presented Image</a><ul class="toc"><li class="tocline"><a href="#definition" class="tocxref"><span class="secno">8.2.1 </span>Definition</a></li><li class="tocline"><a href="#number-per-region" class="tocxref"><span class="secno">8.2.2 </span>Number per Region</a></li></ul></li><li class="tocline"><a href="#div-element" class="tocxref"><span class="secno">8.3 </span><code>div</code> element</a></li><li class="tocline"><a href="#features-1" class="tocxref"><span class="secno">8.4 </span>Features</a></li></ul></li><li class="tocline"><a href="#hypothetical-render-model" class="tocxref"><span class="secno">9. </span>Hypothetical Render Model</a><ul class="toc"><li class="tocline"><a href="#overview" class="tocxref"><span class="secno">9.1 </span>Overview</a></li><li class="tocline"><a href="#general-1" class="tocxref"><span class="secno">9.2 </span>General</a></li><li class="tocline"><a href="#paint-regions" class="tocxref"><span class="secno">9.3 </span>Paint Regions</a></li><li class="tocline"><a href="#paint-images" class="tocxref"><span class="secno">9.4 </span>Paint Images</a></li><li class="tocline"><a href="#paint-text" class="tocxref"><span class="secno">9.5 </span>Paint Text</a></li></ul></li><li class="tocline"><a href="#reference-fonts" class="tocxref"><span class="secno">A. </span>Reference Fonts</a></li><li class="tocline"><a href="#recommended-unicode-code-points-per-language" class="tocxref"><span class="secno">B. </span>Recommended Character Sets</a></li><li class="tocline"><a href="#forced-content" class="tocxref"><span class="secno">C. </span>Forced content (non-normative)</a></li><li class="tocline"><a href="#wcag-applications" class="tocxref"><span class="secno">D. </span>WCAG Considerations</a></li><li class="tocline"><a href="#sample-instance" class="tocxref"><span class="secno">E. </span>Sample Document Instance (non-normative)</a></li><li class="tocline"><a href="#features-and-extensions" class="tocxref"><span class="secno">F. </span>Extensions</a><ul class="toc"><li class="tocline"><a href="#general-2" class="tocxref"><span class="secno">F.1 </span>General</a></li><li class="tocline"><a href="#progressivelydecodable" class="tocxref"><span class="secno">F.2 </span>#progressivelyDecodable</a></li><li class="tocline"><a href="#aspectratio" class="tocxref"><span class="secno">F.3 </span>#aspectRatio</a></li><li class="tocline"><a href="#forceddisplay" class="tocxref"><span class="secno">F.4 </span>#forcedDisplay</a></li><li class="tocline"><a href="#alttext" class="tocxref"><span class="secno">F.5 </span>#altText</a></li><li class="tocline"><a href="#linepadding" class="tocxref"><span class="secno">F.6 </span>#linePadding</a></li><li class="tocline"><a href="#multirowalign" class="tocxref"><span class="secno">F.7 </span>#multiRowAlign</a></li></ul></li><li class="tocline"><a href="#references" class="tocxref"><span class="secno">G. </span>References</a><ul class="toc"><li class="tocline"><a href="#normative-references" class="tocxref"><span class="secno">G.1 </span>Normative references</a></li><li class="tocline"><a href="#informative-references" class="tocxref"><span class="secno">G.2 </span>Informative references</a></li></ul></li></ul></section>
 
   
 
-  <section id="scope" typeof="bibo:Chapter" resource="#scope" rel="bibo:Chapter">
-    <!--OddPage--><h2 role="heading" id="h2_scope"><span class="secno">1. </span>Scope</h2>
+  <section id="scope" typeof="bibo:Chapter" resource="#scope" property="bibo:hasPart">
+    <!--OddPage--><h2 id="h-scope" resource="#h-scope"><span property="xhv:role" resource="xhv:heading"><span class="secno">1. </span>Scope</span></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
@@ -397,16 +416,16 @@
     [<cite><a class="bibref" href="#bib-EBU-TT-D">EBU-TT-D</a></cite>].</p>
   </section>
 	
-	  <section id="conventions" typeof="bibo:Chapter" resource="#conventions" rel="bibo:Chapter">
-    <!--OddPage--><h2 role="heading" id="h2_conventions"><span class="secno">2. </span>Documentation Conventions</h2>
+	  <section id="conventions" typeof="bibo:Chapter" resource="#conventions" property="bibo:hasPart">
+    <!--OddPage--><h2 id="h-conventions" resource="#h-conventions"><span property="xhv:role" resource="xhv:heading"><span class="secno">2. </span>Documentation Conventions</span></h2>
 
     <p>This specification uses the same conventions as [<cite><a class="bibref" href="#bib-TTML1">TTML1</a></cite>] for the specification of parameter attributes, styling attributes and metadata elements. In particular, Section 2.3 of [<cite><a class="bibref" href="#bib-TTML1">TTML1</a></cite>] specifies conventions used in the XML representation of elements.</p>
 		
 		<p>All content of this specification that is not explicitly marked as non-normative is considered to be normative. If a section or appendix header contains the expression "non-normative", then the entirety of the section or appendix is considered non-normative.</p>
   </section>
 
-  <section id="terms" typeof="bibo:Chapter" resource="#terms" rel="bibo:Chapter">
-    <!--OddPage--><h2 role="heading" id="h2_terms"><span class="secno">3. </span>Terms and Definitions</h2>
+  <section id="terms" typeof="bibo:Chapter" resource="#terms" property="bibo:hasPart">
+    <!--OddPage--><h2 id="h-terms" resource="#h-terms"><span property="xhv:role" resource="xhv:heading"><span class="secno">3. </span>Terms and Definitions</span></h2>
 		
 		<p><dfn id="dfn-default-region">Default Region</dfn>. See Section 9.3.1 at [<cite><a class="bibref" href="#bib-TTML1">TTML1</a></cite>].</p>
 		
@@ -422,7 +441,7 @@
 
   </section>
 
-  <section id="conformance" typeof="bibo:Chapter" resource="#conformance" rel="bibo:Chapter"><!--OddPage--><h2 role="heading" id="h2_conformance"><span class="secno">4. </span>Conformance</h2>
+  <section id="conformance" typeof="bibo:Chapter" resource="#conformance" property="bibo:hasPart"><!--OddPage--><h2 id="h-conformance" resource="#h-conformance"><span property="xhv:role" resource="xhv:heading"><span class="secno">4. </span>Conformance</span></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
@@ -457,18 +476,18 @@
       provisions of the profile.</li>
     </ul>
 
-    <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
+    <div class="note"><div class="note-title" aria-level="3" role="heading" id="h-note1"><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
     Profile).</p></div>
   </section>
 
-  <section id="profiles" typeof="bibo:Chapter" resource="#profiles" rel="bibo:Chapter">
-    <!--OddPage--><h2 role="heading" id="h2_profiles"><span class="secno">5. </span>Profiles</h2>
-
-    <section id="general">
-      <h3 role="heading" id="h3_general"><span class="secno">5.1 </span>General</h3>
+  <section id="profiles" typeof="bibo:Chapter" resource="#profiles" property="bibo:hasPart">
+    <!--OddPage--><h2 id="h-profiles" resource="#h-profiles"><span property="xhv:role" resource="xhv:heading"><span class="secno">5. </span>Profiles</span></h2>
+
+    <section id="general" typeof="bibo:Chapter" resource="#general" property="bibo:hasPart">
+      <h3 id="h-general" resource="#h-general"><span property="xhv:role" resource="xhv:heading"><span class="secno">5.1 </span>General</span></h3>
 
       <p>A <a href="#dfn-document-instance" class="internalDFN">Document Instance</a> <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>
 
@@ -478,7 +497,7 @@
       <a href="#dfn-document-instance" class="internalDFN">Document Instance</a> such that, when image content is encountered, assistive technologies have access to its corresponding text
       form. The method by which this association is made is left to each application.</p> 
 
-      <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">6.7.4</span> <span class="sec-title">ittm:altText</span></a> also allows text equivalent
+      <div class="note"><div class="note-title" aria-level="4" role="heading" id="h-note2"><span>Note</span></div><p class="">The <code>ittm:altText</code> element specified <a href="#ttm-altText" class="sec-ref"><span class="secno">6.7.4</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>
 
@@ -486,37 +505,37 @@
       guidelines.</p>
     </section>
 
-    <section id="text-profile">
-      <h3 role="heading" id="h3_text-profile"><span class="secno">5.2 </span>Text Profile</h3>
+    <section id="text-profile" typeof="bibo:Chapter" resource="#text-profile" property="bibo:hasPart">
+      <h3 id="h-text-profile" resource="#h-text-profile"><span property="xhv:role" resource="xhv:heading"><span class="secno">5.2 </span>Text Profile</span></h3>
 
       <p>The <dfn id="dfn-text-profile">Text Profile</dfn> consists of Sections <a href="#common-constraints" class="sec-ref"><span class="secno">6.</span> <span class="sec-title">Common Constraints</span></a> and <a href="#text-profile-constraints" class="sec-ref"><span class="secno">7.</span> <span class="sec-title">Text Profile Constraints</span></a>.</p>
     </section>
 
-    <section id="image-profile">
-      <h3 role="heading" id="h3_image-profile"><span class="secno">5.3 </span>Image Profile</h3>
+    <section id="image-profile" typeof="bibo:Chapter" resource="#image-profile" property="bibo:hasPart">
+      <h3 id="h-image-profile" resource="#h-image-profile"><span property="xhv:role" resource="xhv:heading"><span class="secno">5.3 </span>Image Profile</span></h3>
 
       <p>The <dfn id="dfn-image-profile">Image Profile</dfn> consists of Sections <a href="#common-constraints" class="sec-ref"><span class="secno">6.</span> <span class="sec-title">Common Constraints</span></a> and <a href="#image-profile-constraints" class="sec-ref"><span class="secno">8.</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 role="heading" id="h2_common-constraints"><span class="secno">6. </span>Common Constraints</h2>
-
-    <section id="document-encoding">
-      <h3 role="heading" id="h3_document-encoding"><span class="secno">6.1 </span>Document Encoding</h3>
+  <section id="common-constraints" typeof="bibo:Chapter" resource="#common-constraints" property="bibo:hasPart">
+    <!--OddPage--><h2 id="h-common-constraints" resource="#h-common-constraints"><span property="xhv:role" resource="xhv:heading"><span class="secno">6. </span>Common Constraints</span></h2>
+
+    <section id="document-encoding" typeof="bibo:Chapter" resource="#document-encoding" property="bibo:hasPart">
+      <h3 id="h-document-encoding" resource="#h-document-encoding"><span property="xhv:role" resource="xhv:heading"><span class="secno">6.1 </span>Document Encoding</span></h3>
 
       <p>A <a href="#dfn-document-instance" class="internalDFN">Document Instance</a> <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 role="heading" id="h3_foreign-element-and-attributes"><span class="secno">6.2 </span>Foreign Element and Attributes</h3>
+    <section id="foreign-element-and-attributes" typeof="bibo:Chapter" resource="#foreign-element-and-attributes" property="bibo:hasPart">
+      <h3 id="h-foreign-element-and-attributes" resource="#h-foreign-element-and-attributes"><span property="xhv:role" resource="xhv:heading"><span class="secno">6.2 </span>Foreign Element and Attributes</span></h3>
 
       <p>A <a href="#dfn-document-instance" class="internalDFN">Document Instance</a> <em class="rfc2119" title="MAY">MAY</em> contain elements and attributes that are neither specifically permitted nor forbidden by a
       profile.</p>
     </section>
 
-    <section id="namespaces">
-      <h3 role="heading" id="h3_namespaces"><span class="secno">6.3 </span>Namespaces</h3>
+    <section id="namespaces" typeof="bibo:Chapter" resource="#namespaces" property="bibo:hasPart">
+      <h3 id="h-namespaces" resource="#h-namespaces"><span property="xhv:role" resource="xhv:heading"><span class="secno">6.3 </span>Namespaces</span></h3>
 
       <p>The following namespaces (see [<cite><a class="bibref" href="#bib-xml-names">xml-names</a></cite>]) are used in this specification:</p>
 
@@ -662,25 +681,25 @@
 			<p>The namespaces defined by this specification are mutable [<cite><a class="bibref" href="#bib-namespaceState">namespaceState</a></cite>]; all undefined names in these namespaces are reserved for future standardization by the <abbr title="World Wide Web Consortium">W3C</abbr>.</p>
     </section>
 
-    <section id="overflow">
-      <h3 role="heading" id="h3_overflow"><span class="secno">6.4 </span>Overflow</h3>
+    <section id="overflow" typeof="bibo:Chapter" resource="#overflow" property="bibo:hasPart">
+      <h3 id="h-overflow" resource="#h-overflow"><span property="xhv:role" resource="xhv:heading"><span class="secno">6.4 </span>Overflow</span></h3>
 
       <p>A <a href="#dfn-document-instance" class="internalDFN">Document Instance</a> <em class="rfc2119" title="SHOULD">SHOULD</em> 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="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
+      <div class="note"><div class="note-title" aria-level="4" role="heading" id="h-note3"><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">9.3</span> <span class="sec-title">Paint Regions</span></a>.</p></div>
     </section>
 
-    <section id="related-video-object">
-      <h3 role="heading" id="h3_related-video-object"><span class="secno">6.5 </span>Related Video Object</h3>
+    <section id="related-video-object" typeof="bibo:Chapter" resource="#related-video-object" property="bibo:hasPart">
+      <h3 id="h-related-video-object" resource="#h-related-video-object"><span property="xhv:role" resource="xhv:heading"><span class="secno">6.5 </span>Related Video Object</span></h3>
 
       <p>A <a href="#dfn-document-instance" class="internalDFN">Document Instance</a> <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 role="heading" id="h3_synchronization"><span class="secno">6.6 </span>Synchronization</h3>
+    <section id="synchronization" typeof="bibo:Chapter" resource="#synchronization" property="bibo:hasPart">
+      <h3 id="h-synchronization" resource="#h-synchronization"><span property="xhv:role" resource="xhv:heading"><span class="secno">6.6 </span>Synchronization</span></h3>
 
       <p>Each <a href="#dfn-intermediate-synchronic-document" class="internalDFN">intermediate synchronic document</a> of the <a href="#dfn-document-instance" class="internalDFN">Document Instance</a> is intended to be displayed on a specific frame and
       removed on a specific frame of the related video object.</p>
@@ -694,7 +713,7 @@
         object with a frame rate of 1000 / 1001 × 30 ≈ 29.97.
       </aside>
 
-      <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 <a href="#dfn-document-instance" class="internalDFN">Document Instance</a>
+      <div class="note"><div class="note-title" aria-level="4" role="heading" id="h-note4"><span>Note</span></div><p class="">In typical scenario, the same video program (the related video object) will be used for <a href="#dfn-document-instance" class="internalDFN">Document Instance</a>
       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
@@ -704,16 +723,16 @@
       <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="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
+      <div class="note"><div class="note-title" aria-level="4" role="heading" id="h-note5"><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">6.10</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 role="heading" id="h3_extensions"><span class="secno">6.7 </span>Extensions</h3>
-
-      <section id="ttp-aspectRatio" typeof="bibo:Chapter" resource="#ttp-aspectRatio" rel="bibo:Chapter">
-        <h4 role="heading" id="h4_ttp-aspectRatio"><span class="secno">6.7.1 </span>ittp:aspectRatio</h4>
+    <section id="extensions" typeof="bibo:Chapter" resource="#extensions" property="bibo:hasPart">
+      <h3 id="h-extensions" resource="#h-extensions"><span property="xhv:role" resource="xhv:heading"><span class="secno">6.7 </span>Extensions</span></h3>
+
+      <section id="ttp-aspectRatio" typeof="bibo:Chapter" resource="#ttp-aspectRatio" property="bibo:hasPart">
+        <h4 id="h-ttp-aspectratio" resource="#h-ttp-aspectratio"><span property="xhv:role" resource="xhv:heading"><span class="secno">6.7.1 </span>ittp:aspectRatio</span></h4>
 
         <p>The <code>ittp:aspectRatio</code> attributes allows authorial control of the mapping of the root container of a <a href="#dfn-document-instance" class="internalDFN">Document Instance</a> to the related video object frame.</p>
 
@@ -758,13 +777,10 @@
 
           <li>
             <p>Otherwise, the root container of a <a href="#dfn-document-instance" class="internalDFN">Document Instance</a> <em class="rfc2119" title="SHALL">SHALL</em> be mapped to the related video object frame in its
-            entirety. If <code>tts:extent</code> is present on the <code>tt</code> element, the extents of the root container <em class="rfc2119" title="SHALL">SHALL</em>
-            be equal to the dimensions of the related video object frame.</p>
+            entirety.</p>
           </li>
         </ol>
 
-        <p><code>ittp:aspectRatio</code> <em class="rfc2119" title="SHALL NOT">SHALL NOT</em> be present if <code>tts:extent</code> is present.<br></p>
-
         <p>An <code>ittp:aspectRatio</code> attribute is considered to be significant only when specified on the <code>tt</code>
         element.</p>
 				
@@ -779,15 +795,12 @@
  ...
 &lt;/tt&gt;</pre></div>
 
-        <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">6.10</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
         rounding, i.e. round(x) = floor(x+0.5).</p>
       </section>
 
-      <section id="ttp-progressivelyDecodable" typeof="bibo:Chapter" resource="#ttp-progressivelyDecodable" rel="bibo:Chapter">
-        <h4 role="heading" id="h4_ttp-progressivelyDecodable"><span class="secno">6.7.2 </span>ittp:progressivelyDecodable</h4>
+      <section id="ttp-progressivelyDecodable" typeof="bibo:Chapter" resource="#ttp-progressivelyDecodable" property="bibo:hasPart">
+        <h4 id="h-ttp-progressivelydecodable" resource="#h-ttp-progressivelydecodable"><span property="xhv:role" resource="xhv:heading"><span class="secno">6.7.2 </span>ittp:progressivelyDecodable</span></h4>
 
         <p>A <a href="#dfn-progressively-decodable-document-instance" class="internalDFN">progressively decodable Document Instance</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>
@@ -848,7 +861,7 @@
  ...
 &lt;/tt&gt;</pre></div>
 
-        <div class="note"><div class="note-title" aria-level="3" role="heading" id="h_note_7"><span>Note</span></div><div class="">
+        <div class="note"><div class="note-title" aria-level="5" role="heading" id="h-note6"><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>
 
@@ -874,8 +887,8 @@
         </div></div>
       </section>
 
-      <section id="tts-forcedDisplay" typeof="bibo:Chapter" resource="#tts-forcedDisplay" rel="bibo:Chapter">
-        <h4 role="heading" id="h4_tts-forcedDisplay"><span class="secno">6.7.3 </span>itts:forcedDisplay</h4>
+      <section id="tts-forcedDisplay" typeof="bibo:Chapter" resource="#tts-forcedDisplay" property="bibo:hasPart">
+        <h4 id="h-tts-forceddisplay" resource="#h-tts-forceddisplay"><span property="xhv:role" resource="xhv:heading"><span class="secno">6.7.3 </span>itts:forcedDisplay</span></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>
@@ -960,22 +973,22 @@
 ...</pre></div>
 
 
-        <div class="note"><div class="note-title" aria-level="3" role="heading" id="h_note_8"><span>Note</span></div><p class="">As specified in [<cite><a class="bibref" href="#bib-TTML1">TTML1</a></cite>], the background of a region can be visible even if the computed value of <code>tts:visibility</code> equals
+        <div class="note"><div class="note-title" aria-level="5" role="heading" id="h-note7"><span>Note</span></div><p class="">As specified in [<cite><a class="bibref" href="#bib-TTML1">TTML1</a></cite>], the background of a region can be visible even if the computed value of <code>tts:visibility</code> equals
         "hidden" for all active content within. The background of a region for which <code>itts:forcedDisplay</code> equals "true" can therefore remain visible even if <code>itts:forcedDisplay</code> equals "false" for all active
         content elements within the region 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="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
+        <div class="note"><div class="note-title" aria-level="5" role="heading" id="h-note8"><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="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
+        <div class="note"><div class="note-title" aria-level="5" role="heading" id="h-note9"><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 role="heading" id="h4_ttm-altText"><span class="secno">6.7.4 </span>ittm:altText</h4>
+      <section id="ttm-altText" typeof="bibo:Chapter" resource="#ttm-altText" property="bibo:hasPart">
+        <h4 id="h-ttm-alttext" resource="#h-ttm-alttext"><span property="xhv:role" resource="xhv:heading"><span class="secno">6.7.4 </span>ittm:altText</span></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
@@ -1014,17 +1027,17 @@
 &lt;/div&gt;
 ...</pre></div>
 
-        <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>
+        <div class="note"><div class="note-title" aria-level="5" role="heading" id="h-note10"><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 role="heading" id="h3_region"><span class="secno">6.8 </span>Region</h3>
-
-      <section id="presented-region">
-        <h4 role="heading" id="h4_presented-region"><span class="secno">6.8.1 </span>Presented Region</h4>
+    <section id="region" typeof="bibo:Chapter" resource="#region" property="bibo:hasPart">
+      <h3 id="h-region" resource="#h-region"><span property="xhv:role" resource="xhv:heading"><span class="secno">6.8 </span>Region</span></h3>
+
+      <section id="presented-region" typeof="bibo:Chapter" resource="#presented-region" property="bibo:hasPart">
+        <h4 id="h-presented-region" resource="#h-presented-region"><span property="xhv:role" resource="xhv:heading"><span class="secno">6.8.1 </span>Presented Region</span></h4>
 
         <p>A <dfn id="dfn-presented-region">presented region</dfn> is a temporally active region that satisfies the following conditions:</p>
 
@@ -1040,8 +1053,8 @@
         </ol>
       </section>
 
-      <section id="dimensions-and-position">
-        <h4 role="heading" id="h4_dimensions-and-position"><span class="secno">6.8.2 </span>Dimensions and Position</h4>
+      <section id="dimensions-and-position" typeof="bibo:Chapter" resource="#dimensions-and-position" property="bibo:hasPart">
+        <h4 id="h-dimensions-and-position" resource="#h-dimensions-and-position"><span property="xhv:role" resource="xhv:heading"><span class="secno">6.8.2 </span>Dimensions and Position</span></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
@@ -1051,22 +1064,22 @@
         overlap, i.e. the intersection of the sets of coordinates within each region (including its boundary) is empty.</p>
       </section>
 
-      <section id="maximum-number">
-        <h4 role="heading" id="h4_maximum-number"><span class="secno">6.8.3 </span>Maximum number</h4>
+      <section id="maximum-number" typeof="bibo:Chapter" resource="#maximum-number" property="bibo:hasPart">
+        <h4 id="h-maximum-number" resource="#h-maximum-number"><span property="xhv:role" resource="xhv:heading"><span class="secno">6.8.3 </span>Maximum number</span></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 role="heading" id="h3_hypothetical-render-model-1"><span class="secno">6.9 </span>Hypothetical Render Model</h3>
+    <section id="hypothetical-render-model-1" typeof="bibo:Chapter" resource="#hypothetical-render-model-1" property="bibo:hasPart">
+      <h3 id="h-hypothetical-render-model-1" resource="#h-hypothetical-render-model-1"><span property="xhv:role" resource="xhv:heading"><span class="secno">6.9 </span>Hypothetical Render Model</span></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">9.</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 role="heading" id="h3_common-features"><span class="secno">6.10 </span>Features</h3>
+    <section id="common-features" typeof="bibo:Chapter" resource="#common-features" property="bibo:hasPart">
+      <h3 id="h-common-features" resource="#h-common-features"><span property="xhv:role" resource="xhv:heading"><span class="secno">6.10 </span>Features</span></h3>
 
       <p>Unless specified otherwise,a <a href="#dfn-document-instance" class="internalDFN">Document Instance</a> <em class="rfc2119" title="SHALL">SHALL</em> conform to the following:</p>
 
@@ -1506,17 +1519,17 @@
         </tbody>
       </table>
 
-      <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
+      <div class="note"><div class="note-title" aria-level="4" role="heading" id="h-note11"><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 role="heading" id="h2_text-profile-constraints"><span class="secno">7. </span>Text Profile Constraints</h2>
-
-    <section id="text-profile-designator" typeof="bibo:Chapter" resource="#text-profile-designator" rel="bibo:Chapter">
-      <h3 role="heading" id="h3_text-profile-designator"><span class="secno">7.1 </span>Profile Designator</h3>
+  <section id="text-profile-constraints" typeof="bibo:Chapter" resource="#text-profile-constraints" property="bibo:hasPart">
+    <!--OddPage--><h2 id="h-text-profile-constraints" resource="#h-text-profile-constraints"><span property="xhv:role" resource="xhv:heading"><span class="secno">7. </span>Text Profile Constraints</span></h2>
+
+    <section id="text-profile-designator" typeof="bibo:Chapter" resource="#text-profile-designator" property="bibo:hasPart">
+      <h3 id="h-text-profile-designator" resource="#h-text-profile-designator"><span property="xhv:role" resource="xhv:heading"><span class="secno">7.1 </span>Profile Designator</span></h3>
 
       <p>This profile is associated with the following profile designator:</p>
 
@@ -1538,32 +1551,32 @@
         </tbody>
       </table>
 
-      <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">6.10</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="4" role="heading" id="h-note12"><span>Note</span></div><p class="">As specified in <a href="#common-features" class="sec-ref"><span class="secno">6.10</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 <a href="#dfn-document-instance" class="internalDFN">Document Instance</a> to the profile. The details of such signaling depends on the application, and can, for instance, use
       metadata structures out-of-band of the <a href="#dfn-document-instance" class="internalDFN">Document Instance</a>.</p></div>
     </section>
 
-    <section id="recommended-character-sets">
-      <h3 role="heading" id="h3_recommended-character-sets"><span class="secno">7.2 </span>Recommended Character Sets</h3>
+    <section id="recommended-character-sets" typeof="bibo:Chapter" resource="#recommended-character-sets" property="bibo:hasPart">
+      <h3 id="h-recommended-character-sets" resource="#h-recommended-character-sets"><span property="xhv:role" resource="xhv:heading"><span class="secno">7.2 </span>Recommended Character Sets</span></h3>
 
       <p>A <a href="#dfn-document-instance" class="internalDFN">Document Instance</a> <em class="rfc2119" title="SHOULD">SHOULD</em> be authored using characters selected from the sets specified in <a href="#recommended-unicode-code-points-per-language" class="sec-ref"><span class="secno">B.</span> <span class="sec-title">Recommended Character Sets</span></a>.</p>
     </section>
 		
-    <section id="reference-fonts-1">
-      <h3 role="heading" id="h3_reference-fonts-1"><span class="secno">7.3 </span>Reference Fonts</h3>
+    <section id="reference-fonts-1" typeof="bibo:Chapter" resource="#reference-fonts-1" property="bibo:hasPart">
+      <h3 id="h-reference-fonts-1" resource="#h-reference-fonts-1"><span property="xhv:role" resource="xhv:heading"><span class="secno">7.3 </span>Reference Fonts</span></h3>
 				
 		  <p>The flow of text within a region depends the dimensions and spacing (kerning) between individual glyphs. The following allows, for instance, region extents to be set such that text flows without clipping.</p>
 
       <p>When processing glyphs that match the combinations of computed font family and code point listed in <a href="#reference-fonts" class="sec-ref"><span class="secno">A.</span> <span class="sec-title">Reference Fonts</span></a>, e.g. during layout, a <a href="#dfn-presentation-processor" class="internalDFN">presentation processor</a> or <a href="#dfn-transformation-processor" class="internalDFN">transformation processor</a> <em class="rfc2119" title="SHALL">SHALL</em> use glyph metrics equal to the metrics of the specified reference font, unless the glyph is not defined by the reference font.</p>
 			
-			<div class="note"><div class="note-title" aria-level="2" role="heading" id="h_note_14"><span>Note</span></div><p class="">Implementations can use fonts other than those specified in <a href="#reference-fonts" class="sec-ref"><span class="secno">A.</span> <span class="sec-title">Reference Fonts</span></a>. Two fonts with equal metrics can have a different appearance, but flow identically.</p></div>
+			<div class="note"><div class="note-title" aria-level="4" role="heading" id="h-note13"><span>Note</span></div><p class="">Implementations can use fonts other than those specified in <a href="#reference-fonts" class="sec-ref"><span class="secno">A.</span> <span class="sec-title">Reference Fonts</span></a>. Two fonts with equal metrics can have a different appearance, but flow identically.</p></div>
 			
     </section>
 
 	
-    <section id="features">
-      <h3 role="heading" id="h3_features"><span class="secno">7.4 </span>Features</h3>
+    <section id="features" typeof="bibo:Chapter" resource="#features" property="bibo:hasPart">
+      <h3 id="h-features" resource="#h-features"><span property="xhv:role" resource="xhv:heading"><span class="secno">7.4 </span>Features</span></h3>
 
       <p>The <a href="#dfn-document-instance" class="internalDFN">Document Instance</a> <em class="rfc2119" title="SHALL">SHALL</em> conform to the following table:</p>
 
@@ -1881,11 +1894,11 @@
     </section>
   </section>
 
-  <section id="image-profile-constraints" typeof="bibo:Chapter" resource="#image-profile-constraints" rel="bibo:Chapter">
-    <!--OddPage--><h2 role="heading" id="h2_image-profile-constraints"><span class="secno">8. </span>Image Profile Constraints</h2>
-
-    <section id="image-profile-designator" typeof="bibo:Chapter" resource="#image-profile-designator" rel="bibo:Chapter">
-      <h3 role="heading" id="h3_image-profile-designator"><span class="secno">8.1 </span>Profile Designator</h3>
+  <section id="image-profile-constraints" typeof="bibo:Chapter" resource="#image-profile-constraints" property="bibo:hasPart">
+    <!--OddPage--><h2 id="h-image-profile-constraints" resource="#h-image-profile-constraints"><span property="xhv:role" resource="xhv:heading"><span class="secno">8. </span>Image Profile Constraints</span></h2>
+
+    <section id="image-profile-designator" typeof="bibo:Chapter" resource="#image-profile-designator" property="bibo:hasPart">
+      <h3 id="h-image-profile-designator" resource="#h-image-profile-designator"><span property="xhv:role" resource="xhv:heading"><span class="secno">8.1 </span>Profile Designator</span></h3>
 
       <p>This profile is associated with the following profile designator:</p>
 
@@ -1905,32 +1918,32 @@
         </tbody>
       </table>
 
-      <div class="note"><div class="note-title" aria-level="2" role="heading" id="h_note_15"><span>Note</span></div><p class="">As specified in <a href="#common-features" class="sec-ref"><span class="secno">6.10</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="4" role="heading" id="h-note14"><span>Note</span></div><p class="">As specified in <a href="#common-features" class="sec-ref"><span class="secno">6.10</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 <a href="#dfn-document-instance" class="internalDFN">Document Instance</a> to the profile. The details of such signaling depends on the application, and can, for instance, use
       metadata structures out-of-band of the <a href="#dfn-document-instance" class="internalDFN">Document Instance</a>.</p></div>
     </section>
 
-    <section id="presented-image">
-      <h3 role="heading" id="h3_presented-image"><span class="secno">8.2 </span>Presented Image</h3>
-
-      <section id="definition">
-        <h4 role="heading" id="h4_definition"><span class="secno">8.2.1 </span>Definition</h4>
+    <section id="presented-image" typeof="bibo:Chapter" resource="#presented-image" property="bibo:hasPart">
+      <h3 id="h-presented-image" resource="#h-presented-image"><span property="xhv:role" resource="xhv:heading"><span class="secno">8.2 </span>Presented Image</span></h3>
+
+      <section id="definition" typeof="bibo:Chapter" resource="#definition" property="bibo:hasPart">
+        <h4 id="h-definition" resource="#h-definition"><span property="xhv:role" resource="xhv:heading"><span class="secno">8.2.1 </span>Definition</span></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 role="heading" id="h4_number-per-region"><span class="secno">8.2.2 </span>Number per Region</h4>
+      <section id="number-per-region" typeof="bibo:Chapter" resource="#number-per-region" property="bibo:hasPart">
+        <h4 id="h-number-per-region" resource="#h-number-per-region"><span property="xhv:role" resource="xhv:heading"><span class="secno">8.2.2 </span>Number per Region</span></h4>
 
         <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>
 
       </section>
     </section>
 
-    <section id="div-element">
-      <h3 role="heading" id="h3_div-element"><span class="secno">8.3 </span><code>div</code> element</h3>
+    <section id="div-element" typeof="bibo:Chapter" resource="#div-element" property="bibo:hasPart">
+      <h3 id="h-div-element" resource="#h-div-element"><span property="xhv:role" resource="xhv:heading"><span class="secno">8.3 </span><code>div</code> element</span></h3>
 
       <p>If a <code>smpte:backgroundImage</code> attribute is applied to a <code>div</code> element:
 
@@ -1949,11 +1962,11 @@
 			
 			<p></p>
 			
-			<div class="note"><div class="note-title" aria-level="2" role="heading" id="h_note_16"><span>Note</span></div><p class="">In [<cite><a class="bibref" href="#bib-TTML1">TTML1</a></cite>], <code>tts:extent</code> and <code>tts:origin</code> do not apply to <code>div</code> elements. In order to individually position multiple <code>div</code> elements, each <code>div</code> can be associated with a distinct <code>region</code> with the desired <code>tts:extent</code> and <code>tts:origin</code>.</p></div>
+			<div class="note"><div class="note-title" aria-level="4" role="heading" id="h-note15"><span>Note</span></div><p class="">In [<cite><a class="bibref" href="#bib-TTML1">TTML1</a></cite>], <code>tts:extent</code> and <code>tts:origin</code> do not apply to <code>div</code> elements. In order to individually position multiple <code>div</code> elements, each <code>div</code> can be associated with a distinct <code>region</code> with the desired <code>tts:extent</code> and <code>tts:origin</code>.</p></div>
     </section>
 
-    <section id="features-1">
-      <h3 role="heading" id="h3_features-1"><span class="secno">8.4 </span>Features</h3>
+    <section id="features-1" typeof="bibo:Chapter" resource="#features-1" property="bibo:hasPart">
+      <h3 id="h-features-1" resource="#h-features-1"><span property="xhv:role" resource="xhv:heading"><span class="secno">8.4 </span>Features</span></h3>
 
       <p>The features included in a <a href="#dfn-document-instance" class="internalDFN">Document Instance</a> <em class="rfc2119" title="SHALL">SHALL</em> conform to the Table below:</p>
 
@@ -2111,12 +2124,12 @@
     </section>
   </section>
 
-  <section id="hypothetical-render-model" typeof="bibo:Chapter" resource="#hypothetical-render-model" rel="bibo:Chapter">
-    <!--OddPage--><h2 role="heading" id="h2_hypothetical-render-model"><span class="secno">9. </span>Hypothetical Render Model</h2>
-
-    <section id="overview">
-
-        <h3 role="heading" id="h3_overview"><span class="secno">9.1 </span>Overview</h3>
+  <section id="hypothetical-render-model" typeof="bibo:Chapter" resource="#hypothetical-render-model" property="bibo:hasPart">
+    <!--OddPage--><h2 id="h-hypothetical-render-model" resource="#h-hypothetical-render-model"><span property="xhv:role" resource="xhv:heading"><span class="secno">9. </span>Hypothetical Render Model</span></h2>
+
+    <section id="overview" typeof="bibo:Chapter" resource="#overview" property="bibo:hasPart">
+
+        <h3 id="h-overview" resource="#h-overview"><span property="xhv:role" resource="xhv:heading"><span class="secno">9.1 </span>Overview</span></h3>
 
         <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
@@ -2158,8 +2171,8 @@
         documents, allowing images to be copied into the Presentation Buffer instead of decoded.</p>
       </section>
 
-      <section id="general-1">
-        <h3 role="heading" id="h3_general-1"><span class="secno">9.2 </span>General</h3>
+      <section id="general-1" typeof="bibo:Chapter" resource="#general-1" property="bibo:hasPart">
+        <h3 id="h-general-1" resource="#h-general-1"><span property="xhv:role" resource="xhv:heading"><span class="secno">9.2 </span>General</span></h3>
 
         <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>
@@ -2211,7 +2224,7 @@
         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="2" role="heading" id="h_note_17"><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="4" role="heading" id="h-note16"><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>
 
@@ -2244,15 +2257,15 @@
           </tbody>
         </table>
 
-        <div class="note"><div class="note-title" aria-level="2" role="heading" id="h_note_18"><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="4" role="heading" id="h-note17"><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="2" role="heading" id="h_note_19"><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="4" role="heading" id="h-note18"><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">
-        <h3 role="heading" id="h3_paint-regions"><span class="secno">9.3 </span>Paint Regions</h3>
+      <section id="paint-regions" typeof="bibo:Chapter" resource="#paint-regions" property="bibo:hasPart">
+        <h3 id="h-paint-regions" resource="#h-paint-regions"><span property="xhv:role" resource="xhv:heading"><span class="secno">9.3 </span>Paint Regions</span></h3>
 
         <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>
@@ -2261,7 +2274,7 @@
 
         <p>where CLEAR(E<sub>0</sub>) = 0 and CLEAR(E<sub>n | n &gt; 0</sub>) = 1, i.e. the root container in its entirety.</p>
 
-        <div class="note"><div class="note-title" aria-level="2" role="heading" id="h_note_20"><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="4" role="heading" id="h-note19"><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
@@ -2306,8 +2319,8 @@
         region pixels.</p>
       </section>
 
-      <section id="paint-images" typeof="bibo:Chapter" resource="#paint-images" rel="bibo:Chapter">
-        <h3 role="heading" id="h3_paint-images"><span class="secno">9.4 </span>Paint Images</h3>
+      <section id="paint-images" typeof="bibo:Chapter" resource="#paint-images" property="bibo:hasPart">
+        <h3 id="h-paint-images" resource="#h-paint-images"><span property="xhv:role" resource="xhv:heading"><span class="secno">9.4 </span>Paint Images</span></h3>
 
         <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>
@@ -2398,8 +2411,8 @@
         </table>
       </section>
 
-      <section id="paint-text" typeof="bibo:Chapter" resource="#paint-text" rel="bibo:Chapter">
-        <h3 role="heading" id="h3_paint-text"><span class="secno">9.5 </span>Paint Text</h3>
+      <section id="paint-text" typeof="bibo:Chapter" resource="#paint-text" property="bibo:hasPart">
+        <h3 id="h-paint-text" resource="#h-paint-text"><span property="xhv:role" resource="xhv:heading"><span class="secno">9.5 </span>Paint Text</span></h3>
 
         <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>
@@ -2520,7 +2533,7 @@
           </tbody>
         </table>
 
-        <div class="note"><div class="note-title" aria-level="2" role="heading" id="h_note_21"><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="4" role="heading" id="h-note20"><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>
 
@@ -2549,8 +2562,8 @@
     </section>
 
 
-    <section class="appendix" id="reference-fonts" typeof="bibo:Chapter" resource="#reference-fonts" rel="bibo:Chapter">
-      <!--OddPage--><h2 role="heading" id="h2_reference-fonts"><span class="secno">A. </span>Reference Fonts</h2>
+    <section class="appendix" id="reference-fonts" typeof="bibo:Chapter" resource="#reference-fonts" property="bibo:hasPart">
+      <!--OddPage--><h2 id="h-reference-fonts" resource="#h-reference-fonts"><span property="xhv:role" resource="xhv:heading"><span class="secno">A. </span>Reference Fonts</span></h2>
 
 
 
@@ -2596,12 +2609,12 @@
         </tbody>
       </table>
 
-      <div class="note"><div class="note-title" aria-level="1" role="heading" id="h_note_22"><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="3" role="heading" id="h-note21"><span>Note</span></div><p class="">proportionalSansSerif is not used in practice for Hebrew and Arabic captions and subtitles.</p></div>
     </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 role="heading" id="h2_recommended-unicode-code-points-per-language"><span class="secno">B. </span>Recommended Character Sets</h2>
+  <section class="appendix" id="recommended-unicode-code-points-per-language" typeof="bibo:Chapter" resource="#recommended-unicode-code-points-per-language" property="bibo:hasPart">
+    <!--OddPage--><h2 id="h-recommended-unicode-code-points-per-language" resource="#h-recommended-unicode-code-points-per-language"><span property="xhv:role" resource="xhv:heading"><span class="secno">B. </span>Recommended Character Sets</span></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
@@ -2938,8 +2951,8 @@
     </table>
   </section>
 
-  <section class="appendix" id="forced-content" typeof="bibo:Chapter" resource="#forced-content" rel="bibo:Chapter">
-    <!--OddPage--><h2 role="heading" id="h2_forced-content"><span class="secno">C. </span>Forced content (non-normative)</h2>
+  <section class="appendix" id="forced-content" typeof="bibo:Chapter" resource="#forced-content" property="bibo:hasPart">
+    <!--OddPage--><h2 id="h-forced-content" resource="#h-forced-content"><span property="xhv:role" resource="xhv:heading"><span class="secno">C. </span>Forced content (non-normative)</span></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
@@ -2967,8 +2980,8 @@
     subtitle and audio tracks depends on the application.</p>
   </section>
 
-  <section class="appendix" id="wcag-applications" typeof="bibo:Chapter" resource="#wcag-applications" rel="bibo:Chapter">
-    <!--OddPage--><h2 role="heading" id="h2_wcag-applications"><span class="secno">D. </span>WCAG Considerations</h2>
+  <section class="appendix" id="wcag-applications" typeof="bibo:Chapter" resource="#wcag-applications" property="bibo:hasPart">
+    <!--OddPage--><h2 id="h-wcag-applications" resource="#h-wcag-applications"><span property="xhv:role" resource="xhv:heading"><span class="secno">D. </span>WCAG Considerations</span></h2>
 
     <p>In order to meet the guidelines in [<cite><a class="bibref" href="#bib-WCAG20">WCAG20</a></cite>], the following considerations apply.</p>
 
@@ -2997,8 +3010,8 @@
     alternative text (that they can use) when they land on the non-text content (that they can't use).</p>
   </section>
 	
-	  <section class="appendix" id="sample-instance" typeof="bibo:Chapter" resource="#sample-instance" rel="bibo:Chapter">
-    <!--OddPage--><h2 role="heading" id="h2_sample-instance"><span class="secno">E. </span>Sample Document Instance (non-normative)</h2>
+	  <section class="appendix" id="sample-instance" typeof="bibo:Chapter" resource="#sample-instance" property="bibo:hasPart">
+    <!--OddPage--><h2 id="h-sample-instance" resource="#h-sample-instance"><span property="xhv:role" resource="xhv:heading"><span class="secno">E. </span>Sample Document Instance (non-normative)</span></h2>
 
     <p>The following sample <a title="Document Instance" href="#dfn-document-instance" class="internalDFN">Document Instances</a> conforms to the Text and Image Profiles, respectively. These samples are for illustration only, and are neither intended to capture current or future practice, nor exercise all normative prose contained in this specification.</p>
 
@@ -3050,18 +3063,18 @@
 &lt;/tt&gt;
 &lt;/pre&gt;</pre></div></section>
 
-  <section class="appendix" id="features-and-extensions" typeof="bibo:Chapter" resource="#features-and-extensions" rel="bibo:Chapter">
-    <!--OddPage--><h2 role="heading" id="h2_features-and-extensions"><span class="secno">F. </span>Extensions</h2>
-
-    <section class="appendix" id="general-2">
-      <h3 role="heading" id="h3_general-2"><span class="secno">F.1 </span>General</h3>
+  <section class="appendix" id="features-and-extensions" typeof="bibo:Chapter" resource="#features-and-extensions" property="bibo:hasPart">
+    <!--OddPage--><h2 id="h-features-and-extensions" resource="#h-features-and-extensions"><span property="xhv:role" resource="xhv:heading"><span class="secno">F. </span>Extensions</span></h2>
+
+    <section class="appendix" id="general-2" typeof="bibo:Chapter" resource="#general-2" property="bibo:hasPart">
+      <h3 id="h-general-2" resource="#h-general-2"><span property="xhv:role" resource="xhv:heading"><span class="secno">F.1 </span>General</span></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 role="heading" id="h3_progressivelydecodable"><span class="secno">F.2 </span>#progressivelyDecodable</h3>
+    <section class="appendix" id="progressivelydecodable" typeof="bibo:Chapter" resource="#progressivelydecodable" property="bibo:hasPart">
+      <h3 id="h-progressivelydecodable" resource="#h-progressivelydecodable"><span property="xhv:role" resource="xhv:heading"><span class="secno">F.2 </span>#progressivelyDecodable</span></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>
@@ -3071,8 +3084,8 @@
       attribute.</p>
     </section>
 
-    <section class="appendix" id="aspectratio">
-      <h3 role="heading" id="h3_aspectratio"><span class="secno">F.3 </span>#aspectRatio</h3>
+    <section class="appendix" id="aspectratio" typeof="bibo:Chapter" resource="#aspectratio" property="bibo:hasPart">
+      <h3 id="h-aspectratio" resource="#h-aspectratio"><span property="xhv:role" resource="xhv:heading"><span class="secno">F.3 </span>#aspectRatio</span></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>
@@ -3081,8 +3094,8 @@
       support for values of the <a href="#ttp-aspectRatio"><code>ittp:aspectRatio</code></a> attribute.</p>
     </section>
 
-    <section class="appendix" id="forceddisplay">
-      <h3 role="heading" id="h3_forceddisplay"><span class="secno">F.4 </span>#forcedDisplay</h3>
+    <section class="appendix" id="forceddisplay" typeof="bibo:Chapter" resource="#forceddisplay" property="bibo:hasPart">
+      <h3 id="h-forceddisplay" resource="#h-forceddisplay"><span property="xhv:role" resource="xhv:heading"><span class="secno">F.4 </span>#forcedDisplay</span></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>
@@ -3091,8 +3104,8 @@
       support for values of the <a href="#tts-forcedDisplay"><code>itts:forcedDisplay</code></a> attribute.</p>
     </section>
 
-    <section class="appendix" id="alttext">
-      <h3 role="heading" id="h3_alttext"><span class="secno">F.5 </span>#altText</h3>
+    <section class="appendix" id="alttext" typeof="bibo:Chapter" resource="#alttext" property="bibo:hasPart">
+      <h3 id="h-alttext" resource="#h-alttext"><span property="xhv:role" resource="xhv:heading"><span class="secno">F.5 </span>#altText</span></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>
@@ -3101,8 +3114,8 @@
       for values of the <a href="#ttm-altText"><code>ittm:altText</code></a> element.</p>
     </section>
 
-    <section class="appendix" id="linepadding">
-      <h3 role="heading" id="h3_linepadding"><span class="secno">F.6 </span>#linePadding</h3>
+    <section class="appendix" id="linepadding" typeof="bibo:Chapter" resource="#linepadding" property="bibo:hasPart">
+      <h3 id="h-linepadding" resource="#h-linepadding"><span property="xhv:role" resource="xhv:heading"><span class="secno">F.6 </span>#linePadding</span></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>
@@ -3111,8 +3124,8 @@
       support for 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>
     </section>
 
-    <section class="appendix" id="multirowalign">
-      <h3 role="heading" id="h3_multirowalign"><span class="secno">F.7 </span>#multiRowAlign</h3>
+    <section class="appendix" id="multirowalign" typeof="bibo:Chapter" resource="#multirowalign" property="bibo:hasPart">
+      <h3 id="h-multirowalign" resource="#h-multirowalign"><span property="xhv:role" resource="xhv:heading"><span class="secno">F.7 </span>#multiRowAlign</span></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>
@@ -3123,19 +3136,19 @@
   </section>
 
 
-<section id="references" class="appendix" typeof="bibo:Chapter" resource="#references" rel="bibo:Chapter"><!--OddPage--><h2 role="heading" id="h2_references"><span class="secno">G. </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">G.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="https://tools.ietf.org/html/rfc2119"><cite>Key words for use in RFCs to Indicate Requirement Levels</cite></a>. March 1997. Best Current Practice. URL: <a href="https://tools.ietf.org/html/rfc2119">https://tools.ietf.org/html/rfc2119</a>
-</dd><dt id="bib-ST2052-1">[ST2052-1]</dt><dd rel="dcterms:requires">SMPTE ST 2052-1, Timed Text Format (SMPTE-TT) URL: <a href="https://www.smpte.org/standards ">https://www.smpte.org/standards</a>
-</dd><dt id="bib-TTML1">[TTML1]</dt><dd rel="dcterms:requires">Glenn Adams. <a href="http://www.w3.org/TR/ttml1/"><cite>Timed Text Markup Language 1 (TTML1) (Second Edition)</cite></a>. 24 September 2013. W3C Recommendation. URL: <a href="http://www.w3.org/TR/ttml1/">http://www.w3.org/TR/ttml1/</a>
-</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 role="heading" id="h3_informative-references"><span class="secno">G.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">Ian Hickson; 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>. 28 October 2014. W3C Recommendation. URL: <a href="http://www.w3.org/TR/html5/">http://www.w3.org/TR/html5/</a>
-</dd><dt id="bib-SUBM">[SUBM]</dt><dd rel="dcterms:references">World Wide Web Consortium (W3C). <a href="http://www.w3.org/Submission/2013/SUBM-ttml-ww-profiles-20130607/">TTML Text and Image Profiles for Internet Media Subtitles and Captions</a> (Member Submission, 07 June 2013)
-</dd><dt id="bib-namespaceState">[namespaceState]</dt><dd rel="dcterms:references">Norman Walsh. <a href="http://www.w3.org/TR/namespaceState/"><cite>The Disposition of Names in an XML Namespace</cite></a>. 29 March 2006. W3C Working Draft. URL: <a href="http://www.w3.org/TR/namespaceState/">http://www.w3.org/TR/namespaceState/</a>
-</dd><dt id="bib-ttml10-sdp-us">[ttml10-sdp-us]</dt><dd rel="dcterms:references">Glenn Adams; Monica Martin; Sean Hayes. <a href="http://www.w3.org/TR/ttml10-sdp-us/"><cite>TTML Simple Delivery Profile for Closed Captions (US)</cite></a>. 5 February 2013. W3C Note. URL: <a href="http://www.w3.org/TR/ttml10-sdp-us/">http://www.w3.org/TR/ttml10-sdp-us/</a>
+<section id="references" class="appendix" typeof="bibo:Chapter" resource="#references" property="bibo:hasPart"><!--OddPage--><h2 id="h-references" resource="#h-references"><span property="xhv:role" resource="xhv:heading"><span class="secno">G. </span>References</span></h2><section id="normative-references" typeof="bibo:Chapter" resource="#normative-references" property="bibo:hasPart"><h3 id="h-normative-references" resource="#h-normative-references"><span property="xhv:role" resource="xhv:heading"><span class="secno">G.1 </span>Normative references</span></h3><dl class="bibliography" resource=""><dt id="bib-CLDR">[CLDR]</dt><dd>Unicode Consortium. <a href="http://cldr.unicode.org" property="dc:requires">The Common Locale Data Repository Project</a>
+</dd><dt id="bib-EBU-TT-D">[EBU-TT-D]</dt><dd>European Broadcasting Union (EBU). <a href="https://tech.ebu.ch/docs/tech/tech3380.pdf" property="dc:requires">Tech 3380, EBU-TT-D Subtitling Distribution Format Version 1.0</a>
+</dd><dt id="bib-MHP">[MHP]</dt><dd>ETSI TS 101 812 V1.3.1, Digital Video Broadcasting (DVB); Multimedia Home
+</dd><dt id="bib-RFC2119">[RFC2119]</dt><dd>S. Bradner. <a href="https://tools.ietf.org/html/rfc2119" property="dc:requires"><cite>Key words for use in RFCs to Indicate Requirement Levels</cite></a>. March 1997. Best Current Practice. URL: <a href="https://tools.ietf.org/html/rfc2119" property="dc:requires">https://tools.ietf.org/html/rfc2119</a>
+</dd><dt id="bib-ST2052-1">[ST2052-1]</dt><dd>SMPTE ST 2052-1, Timed Text Format (SMPTE-TT) URL: <a href="https://www.smpte.org/standards " property="dc:requires">https://www.smpte.org/standards</a>
+</dd><dt id="bib-TTML1">[TTML1]</dt><dd>Glenn Adams. <a href="http://www.w3.org/TR/ttml1/" property="dc:requires"><cite>Timed Text Markup Language 1 (TTML1) (Second Edition)</cite></a>. 24 September 2013. W3C Recommendation. URL: <a href="http://www.w3.org/TR/ttml1/" property="dc:requires">http://www.w3.org/TR/ttml1/</a>
+</dd><dt id="bib-UNICODE">[UNICODE]</dt><dd><a href="http://www.unicode.org/versions/latest/" property="dc:requires"><cite>The Unicode Standard</cite></a>. URL: <a href="http://www.unicode.org/versions/latest/" property="dc:requires">http://www.unicode.org/versions/latest/</a>
+</dd><dt id="bib-WCAG20">[WCAG20]</dt><dd>Ben Caldwell; Michael Cooper; Loretta Guarino Reid; Gregg Vanderheiden et al. <a href="http://www.w3.org/TR/WCAG20/" property="dc:requires"><cite>Web Content Accessibility Guidelines (WCAG) 2.0</cite></a>. 11 December 2008. W3C Recommendation. URL: <a href="http://www.w3.org/TR/WCAG20/" property="dc:requires">http://www.w3.org/TR/WCAG20/</a>
+</dd><dt id="bib-xml-names">[xml-names]</dt><dd>Tim Bray; Dave Hollander; Andrew Layman; Richard Tobin; Henry Thompson et al. <a href="http://www.w3.org/TR/xml-names" property="dc:requires"><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" property="dc:requires">http://www.w3.org/TR/xml-names</a>
+</dd></dl></section><section id="informative-references" typeof="bibo:Chapter" resource="#informative-references" property="bibo:hasPart"><h3 id="h-informative-references" resource="#h-informative-references"><span property="xhv:role" resource="xhv:heading"><span class="secno">G.2 </span>Informative references</span></h3><dl class="bibliography" resource=""><dt id="bib-CEA-608">[CEA-608]</dt><dd><a href="http://www.ce.org/Standards/Standard-Listings/R4-3-Television-Data-Systems-Subcommittee/Line-21-Data-Service.aspx" property="dc:references">Line-21 Data Services</a>, ANSI/CEA Standard.
+</dd><dt id="bib-CEA-708">[CEA-708]</dt><dd><a href="http://www.ce.org/Standards/Standard-Listings/R4-3-Television-Data-Systems-Subcommittee/CEA-708-D.aspx" property="dc:references">Digital Television (DTV) Closed Captioning</a>, ANSI/CEA Standard.
+</dd><dt id="bib-HTML5">[HTML5]</dt><dd>Ian Hickson; Robin Berjon; Steve Faulkner; Travis Leithead; Erika Doyle Navara; Edward O'Connor; Silvia Pfeiffer. <a href="http://www.w3.org/TR/html5/" property="dc:references"><cite>HTML5</cite></a>. 28 October 2014. W3C Recommendation. URL: <a href="http://www.w3.org/TR/html5/" property="dc:references">http://www.w3.org/TR/html5/</a>
+</dd><dt id="bib-SUBM">[SUBM]</dt><dd>World Wide Web Consortium (W3C). <a href="http://www.w3.org/Submission/2013/SUBM-ttml-ww-profiles-20130607/" property="dc:references">TTML Text and Image Profiles for Internet Media Subtitles and Captions</a> (Member Submission, 07 June 2013)
+</dd><dt id="bib-namespaceState">[namespaceState]</dt><dd>Norman Walsh. <a href="http://www.w3.org/TR/namespaceState/" property="dc:references"><cite>The Disposition of Names in an XML Namespace</cite></a>. 29 March 2006. W3C Working Draft. URL: <a href="http://www.w3.org/TR/namespaceState/" property="dc:references">http://www.w3.org/TR/namespaceState/</a>
+</dd><dt id="bib-ttml10-sdp-us">[ttml10-sdp-us]</dt><dd>Glenn Adams; Monica Martin; Sean Hayes. <a href="http://www.w3.org/TR/ttml10-sdp-us/" property="dc:references"><cite>TTML Simple Delivery Profile for Closed Captions (US)</cite></a>. 5 February 2013. W3C Note. URL: <a href="http://www.w3.org/TR/ttml10-sdp-us/" property="dc:references">http://www.w3.org/TR/ttml10-sdp-us/</a>
 </dd></dl></section></section></body></html>
\ No newline at end of file
--- a/ttml-ww-profiles/ttml-ww-profiles.source.html	Sun Jan 18 10:50:17 2015 -0700
+++ b/ttml-ww-profiles/ttml-ww-profiles.source.html	Wed Jan 21 22:05:22 2015 -0800
@@ -453,13 +453,10 @@
 
           <li>
             <p>Otherwise, the root container of a <a>Document Instance</a> SHALL be mapped to the related video object frame in its
-            entirety. If <code>tts:extent</code> is present on the <code>tt</code> element, the extents of the root container SHALL
-            be equal to the dimensions of the related video object frame.</p>
+            entirety.</p>
           </li>
         </ol>
 
-        <p><code>ittp:aspectRatio</code> SHALL NOT be present if <code>tts:extent</code> is present.<br></p>
-
         <p>An <code>ittp:aspectRatio</code> attribute is considered to be significant only when specified on the <code>tt</code>
         element.</p>
 				
@@ -476,9 +473,6 @@
 &lt;/tt&gt;
 </pre>
 
-        <p class='note'>As specified in Section <a href="#common-features"></a>, <code>tts:extent</code> is present if the
-        <code>px</code> length measure is used anywhere within the document.</p>
-
         <p>Integer pixel positions on the related video object frame computed from real percentage length values SHALL use half-up
         rounding, i.e. round(x) = floor(x+0.5).</p>
       </section>