[imsc] address ISSUE-428 and ISSUE-429 and clarifies use of NGBS
authorplemieux
Sat, 31 Oct 2015 12:02:25 -0700
changeset 1003 708f521a6550
parent 1002 2cd6f1c06e57
child 1004 b1b25dd66fae
[imsc] address ISSUE-428 and ISSUE-429 and clarifies use of NGBS
ttml-ww-profiles/ttml-ww-profiles.html
ttml-ww-profiles/ttml-ww-profiles.source.html
--- a/ttml-ww-profiles/ttml-ww-profiles.html	Fri Oct 30 13:49:59 2015 +0900
+++ b/ttml-ww-profiles/ttml-ww-profiles.html	Sat Oct 31 12:02:25 2015 -0700
@@ -281,7 +281,7 @@
   </p>
   <h1 class="title p-name" id="title" property="dcterms:title">TTML Profiles for Internet Media Subtitles and Captions 1.0 (IMSC1)</h1>
   
-  <h2 id="w3c-editor-s-draft-30-october-2015"><abbr title="World Wide Web Consortium">W3C</abbr> Editor's Draft <time property="dcterms:issued" class="dt-published" datetime="2015-10-30">30 October 2015</time></h2>
+  <h2 id="w3c-editor-s-draft-31-october-2015"><abbr title="World Wide Web Consortium">W3C</abbr> Editor's Draft <time property="dcterms:issued" class="dt-published" datetime="2015-10-31">31 October 2015</time></h2>
   <dl>
     
       <dt>This version:</dt>
@@ -444,7 +444,7 @@
       
     
   
-</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="#hypothetical-render-model-general" 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-1" 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="#xml-schemas" class="tocxref"><span class="secno">G. </span>XML Schema Definitions (non-normative)</a></li><li class="tocline"><a href="#references" class="tocxref"><span class="secno">H. </span>References</a><ul class="toc"><li class="tocline"><a href="#normative-references" class="tocxref"><span class="secno">H.1 </span>Normative references</a></li><li class="tocline"><a href="#informative-references" class="tocxref"><span class="secno">H.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-non-normative" class="tocxref"><span class="secno">9.1 </span>Overview (non-normative)</a></li><li class="tocline"><a href="#hypothetical-render-model-general" 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-1" 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="#xml-schemas" class="tocxref"><span class="secno">G. </span>XML Schema Definitions (non-normative)</a></li><li class="tocline"><a href="#simple-scripts" class="tocxref"><span class="secno">H. </span>Simple Scripts</a></li><li class="tocline"><a href="#references" class="tocxref"><span class="secno">I. </span>References</a><ul class="toc"><li class="tocline"><a href="#normative-references" class="tocxref"><span class="secno">I.1 </span>Normative references</a></li><li class="tocline"><a href="#informative-references" class="tocxref"><span class="secno">I.2 </span>Informative references</a></li></ul></li></ul></section>
 
   
 
@@ -2425,9 +2425,9 @@
   <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>
+    <section id="overview-non-normative" typeof="bibo:Chapter" resource="#overview-non-normative" property="bibo:hasPart">
+
+        <h3 id="h-overview-non-normative" resource="#h-overview-non-normative"><span property="xhv:role" resource="xhv:heading"><span class="secno">9.1 </span>Overview (non-normative)</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
@@ -2630,7 +2630,7 @@
           D<sub>n</sub> to the Presentation Buffer P<sub>n</sub> using the Image Copier; or</li>
 
           <li>if an identical image is present in Decoded Image Buffer D<sub>n-1</sub>, i.e. an identical image was present in <a href="#dfn-intermediate-synchronic-document" class="internalDFN" data-link-type="dfn">
-            intermediate synchronic document</a> E<sub>n-1</sub>, copy using the Image Copier the glyph from Decoded Image Buffer
+            intermediate synchronic document</a> E<sub>n-1</sub>, copy using the Image Copier the image from Decoded Image Buffer
             D<sub>n-1</sub> to both the Decoded Image Buffer D<sub>n</sub> and the Presentation Buffer P<sub>n</sub>; or
           </li>
 
@@ -2711,25 +2711,11 @@
 
       <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" data-link-type="dfn">intermediate synchronic document</a> E<sub>n</sub>, the Presentation Compositor
-        <em class="rfc2119" title="SHALL">SHALL</em>:</p>
-
-        <ul>
-          <li>if an identical glyph is present in Glyph Buffer G<sub>n</sub>, copy the glyph from Glyph Buffer G<sub>n</sub> to the
-          Presentation Buffer P<sub>n</sub> using the Glyph Copier; or</li>
-
-          <li>if an identical glyph is present in Glyph Buffer G<sub>n-1</sub>, i.e. an identical glyph was present in intermediate
-          synchronic document E<sub>n-1</sub>, copy using the Glyph Copier the glyph from Glyph Buffer G<sub>n-1</sub> to both the
-          Glyph Buffer G<sub>n</sub> and the Presentation Buffer P<sub>n</sub>; or</li>
-
-          <li>otherwise render using the Glyph Renderer the glyph into the Presentation Buffer P<sub>n</sub> and Glyph Buffer
-          G<sub>n</sub> using the corresponding style information.</li>
-        </ul>
-
-        <p>Two glyphs are identical if and only if the following [<cite><a class="bibref" href="#bib-TTML1">TTML1</a></cite>] styles are identical:</p>
-
-        <ul>
+				
+				<p>In the context of this section, a <dfn data-dfn-type="dfn" id="dfn-glyph">glyph</dfn> is a tuple consisting of (i) one character and (ii) the computed values of the following
+				style properties:
+				
+				</p><ul>				
           <li><code>tts:color</code></li>
 
           <li><code>tts:fontFamily</code></li>
@@ -2744,6 +2730,27 @@
 
           <li><code>tts:textOutline</code></li>
         </ul>
+				
+				<p></p>
+				
+				<div class="note"><div class="note-title" aria-level="4" role="heading" id="h-note23"><span>Note</span></div><p class="">In complex scripts, the mapping from character to typographical glyph is not one-to-one. For instance, a given arabic character can 
+				yield multiple glyphs depending on its position in a word. The Hypothetical Render Model however assumes a one-to-one mapping 
+				and accounts for complex scripts by reducing the performance of the glyph buffer.</p></div>
+				
+        <p>For each <a href="#dfn-glyph" class="internalDFN" data-link-type="dfn">glyph</a> associated with a character in a <a href="#dfn-presented-region" class="internalDFN" data-link-type="dfn">presented region</a> of <a href="#dfn-intermediate-synchronic-document" class="internalDFN" data-link-type="dfn">intermediate synchronic document</a> E<sub>n</sub>,
+				the Presentation Compositor <em class="rfc2119" title="SHALL">SHALL</em>:</p>
+
+        <ul>				
+          <li>if an identical <a href="#dfn-glyph" class="internalDFN" data-link-type="dfn">glyph</a> is present in Glyph Buffer G<sub>n</sub>, copy the <a href="#dfn-glyph" class="internalDFN" data-link-type="dfn">glyph</a> from Glyph Buffer G<sub>n</sub> to the
+          Presentation Buffer P<sub>n</sub> using the Glyph Copier; or</li>
+
+          <li>if an identical <a href="#dfn-glyph" class="internalDFN" data-link-type="dfn">glyph</a> is present in Glyph Buffer G<sub>n-1</sub>, i.e. an identical <a href="#dfn-glyph" class="internalDFN" data-link-type="dfn">glyph</a> was present in <a href="#dfn-intermediate-synchronic-document" class="internalDFN" data-link-type="dfn">intermediate
+          synchronic document</a> E<sub>n-1</sub>, copy using the Glyph Copier the <a href="#dfn-glyph" class="internalDFN" data-link-type="dfn">glyph</a> from Glyph Buffer G<sub>n-1</sub> to both the
+          Glyph Buffer G<sub>n</sub> and the Presentation Buffer P<sub>n</sub>; or</li>
+
+          <li>otherwise render using the Glyph Renderer the <a href="#dfn-glyph" class="internalDFN" data-link-type="dfn">glyph</a> into the Presentation Buffer P<sub>n</sub> and Glyph Buffer
+          G<sub>n</sub>.</li>
+        </ul>
 
         <figure id="fig-example-of-presentation-compositor-behavior-for-text-rendering">
           <img src="text-render-example-figure-2.png" alt="Example of Presentation Compositor Behavior for Text Rendering" height="150" width="324">
@@ -2753,107 +2760,110 @@
           </span></figcaption>
         </figure>
 
-        <p>The duration DUR<sub>T</sub>(E<sub>n</sub>) for painting the text of an <a href="#dfn-intermediate-synchronic-document" class="internalDFN" data-link-type="dfn">intermediate synchronic document</a>
+        <p>The duration DUR<sub>T</sub>(E<sub>n</sub>) for rendering the text of an <a href="#dfn-intermediate-synchronic-document" class="internalDFN" data-link-type="dfn">intermediate synchronic document</a>
         E<sub>n</sub> in the Presentation Buffer is as follows:</p>
 
-        <p class="equation">DUR<sub>T</sub>(E<sub>n</sub>) = ∑<sub>G<sub>i</sub> ∈ G<sub>r</sub></sub> NRGA(G<sub>i</sub>) / Ren(G<sub>i</sub>)
-        + ∑<sub>G<sub>j</sub> ∈ G<sub>c</sub></sub> NRGA(G<sub>j</sub>) / GCpy</p>
+        <p class="equation">DUR<sub>T</sub>(E<sub>n</sub>) = ∑<sub>g<sub>i</sub> ∈ Γ<sub>r</sub></sub> NRGA(g<sub>i</sub>) / Ren(g<sub>i</sub>)
+        + ∑<sub>g<sub>j</sub> ∈ Γ<sub>c</sub></sub> NRGA(g<sub>j</sub>) / GCpy</p>
 
         <p>where</p>
 
         <ul>
-          <li>G<sub>r</sub> is the set of glyphs rendered into the Presentation Buffer P<sub>n</sub> using the Glyph Renderer in
+          <li>Γ<sub>r</sub> is the set of <a data-lt="glyph" href="#dfn-glyph" class="internalDFN" data-link-type="dfn">glyphs</a> rendered into the Presentation Buffer P<sub>n</sub> using the Glyph Renderer in
           <a href="#dfn-intermediate-synchronic-document" class="internalDFN" data-link-type="dfn">intermediate synchronic document</a> E<sub>n</sub>;
           </li>
 
-          <li>G<sub>c</sub> is the set of glyphs copied to the Presentation Buffer P<sub>n</sub> using the Glyph Copier in
+          <li>Γ<sub>c</sub> is the set of <a data-lt="glyph" href="#dfn-glyph" class="internalDFN" data-link-type="dfn">glyphs</a> copied to the Presentation Buffer P<sub>n</sub> using the Glyph Copier in
           <a href="#dfn-intermediate-synchronic-document" class="internalDFN" data-link-type="dfn">intermediate synchronic document</a> E<sub>n</sub>;
           </li>
 
-          <li>Ren(G<sub>i</sub>) is the text rendering performance factor glyph G<sub>i</sub>; and</li>
+          <li>Ren(g<sub>i</sub>) is the text rendering performance factor for <a href="#dfn-glyph" class="internalDFN" data-link-type="dfn">glyph</a> g<sub>i</sub>; and</li>
 
           <li>GCpy is the normalized glyph copy performance factor.</li>
         </ul>
 
-        <p>G<sub>r</sub> and G<sub>c</sub> <em class="rfc2119" title="SHALL">SHALL</em> include only glyphs in <a data-lt="presented region" href="#dfn-presented-region" class="internalDFN" data-link-type="dfn">presented regions</a> and <em class="rfc2119" title="SHALL NOT">SHALL NOT</em> include a [<cite><a class="bibref" href="#bib-UNICODE">UNICODE</a></cite>] Code Point if it does not result in a change to presentation, e.g. the Code Point is
-        ignored.</p>
-
-        <p>The Normalized Rendered Glyph Area NRGA(G<sub>i</sub>) of a glyph G<sub>i</sub> <em class="rfc2119" title="SHALL">SHALL</em> be equal to:</p>
-
-        <p class="equation">NRGA(G<sub>i</sub>)= (fontSize of G<sub>i</sub> as percentage of root container height)<sup>2</sup></p>
+        <p>The Normalized Rendered Glyph Area NRGA(g<sub>i</sub>) of a <a href="#dfn-glyph" class="internalDFN" data-link-type="dfn">glyph</a> g<sub>i</sub> <em class="rfc2119" title="SHALL">SHALL</em> be equal to:</p>
+
+        <p class="equation">NRGA(g<sub>i</sub>) = (fontSize of g<sub>i</sub> as percentage of root container height)<sup>2</sup></p>
 
         <p>The contents of the Glyph Buffer G<sub>n</sub> <em class="rfc2119" title="SHALL">SHALL</em> be copied instantaneously to Glyph Buffer G<sub>n-1</sub> at the
         presentation time of <a href="#dfn-intermediate-synchronic-document" class="internalDFN" data-link-type="dfn">intermediate synchronic document</a> E<sub>n</sub>.</p>
 
-        <p>The total size occupied by the glyphs stored in Glyph Buffers G<sub>n</sub> or G<sub>n-1</sub> <em class="rfc2119" title="SHALL">SHALL</em> be the sum of their
-        Normalized Rendered Glyph Area.</p>
-
-        <p>The size of Glyph Buffers G<sub>n</sub> and G<sub>n-1</sub> <em class="rfc2119" title="SHALL">SHALL</em> be the Normalized Glyph Buffer Size (NGBS).</p>
-
-        <p>Unless specified otherwise, the following table <em class="rfc2119" title="SHALL">SHALL</em> specify GCpy, Ren and NGBS, and <em class="rfc2119" title="SHALL">SHALL</em> apply to all supported font
-        styles (including provision of outline border).</p>
+        <p>It <em class="rfc2119" title="SHALL">SHALL</em> be an error for the sum of NRGA(g<sub>i</sub>) over all <a data-lt="glyph" href="#dfn-glyph" class="internalDFN" data-link-type="dfn">glyphs</a> Glyph Buffer G<sub>n</sub> to be larger
+				than the Normalized Glyph Buffer Size (NGBS).</p>
+
+        <p>Unless specified otherwise, the following table specifies values of GCpy, Ren and NGBS.</p>
 
         <table class="simple">
           <thead>
             <tr>
-              <th>Parameter</th>
-
-              <th>Initial value</th>
+              <th style="text-align: center;">Parameter</th>
+							
+							<th style="text-align: center;">Condition</th>
+
+              <th style="text-align: center;">Initial value</th>
             </tr>
           </thead>
 
           <tbody>
             <tr>
-              <td>Normalized glyph copy performance factor (GCpy)</td>
+              <td rowspan="2">Normalized glyph copy performance factor (GCpy)</td>
+							
+							<td>The character of g<sub>i</sub> belongs to a simple script as specified in <a href="#simple-scripts" class="sec-ref"><span class="secno">H.</span> <span class="sec-title">Simple Scripts</span></a></td>
 
               <td>12</td>
             </tr>
+						
+            <tr>
+							
+							<td>otherwise</td>
+
+              <td>3</td>
+            </tr>
 
             <tr>
-              <td>Text rendering performance factor Ren(G<sub>i</sub> if G<sub>i</sub> is not a CJK Unified Ideograph as specified
-              in [<cite><a class="bibref" href="#bib-UNICODE">UNICODE</a></cite>].</td>
-
-              <td>1.2</td>
-            </tr>
-
-            <tr>
-              <td>Text rendering performance factor Ren(G<sub>i</sub>) if G<sub>i</sub> is a CJK Unified Ideograph as specified in
-              [<cite><a class="bibref" href="#bib-UNICODE">UNICODE</a></cite>].</td>
+              <td rowspan="2">Text rendering performance factor Ren(G<sub>i</sub>)</td>
+							<td>The character of g<sub>i</sub> belongs to the CJK Unified Ideograph block as specified in [<cite><a class="bibref" href="#bib-UNICODE">UNICODE</a></cite>]</td>
 
               <td>0.6</td>
             </tr>
 
             <tr>
-              <td>Normalized Glyph Buffer Size (NGBS)</td>
+              <td>otherwise</td>
+
+              <td>1.2</td>
+            </tr>
+
+            <tr>
+              <td colspan="2">Normalized Glyph Buffer Size (NGBS)</td>
 
               <td>1</td>
             </tr>
           </tbody>
         </table>
 
-        <div class="note"><div class="note-title" aria-level="4" role="heading" id="h-note23"><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
+        <div class="note"><div class="note-title" aria-level="4" role="heading" id="h-note24"><span>Note</span></div><p class="">NRGA(G<sub>i</sub>) does not take into account decorations (e.g. underline), effects (e.g.
+        outline) or actual typographical glyph aspect ratio. An implementation can determine an actual buffer size needs based on worst-case
         glyph size complexity.</p></div>
 
         <aside class="example"><div class="example-title"><span>Example 7</span></div>
-          Setting a Normalized Glyph Buffer Size effectively sets a limit on the total number of distinct glyphs present in any
+          Setting a Normalized Glyph Buffer Size effectively sets a limit on the total number of distinct <a data-lt="glyph" href="#dfn-glyph" class="internalDFN" data-link-type="dfn">glyphs</a> present in any
           given <a href="#dfn-intermediate-synchronic-document" class="internalDFN" data-link-type="dfn">intermediate synchronic document</a> E<sub>n</sub>. For example, assuming a maximum Normalized Glyph Buffer Size
-          of 1 and the default tts:fontSize of 1c are used, the glyph's height as percentage of root container height is 1/15 , and
-          the maximum number of distinct glyphs that can be buffered is 1÷(1÷15)^2=225 glyphs. In this example, an implementation
-          rendering at 1920x1080 would need to allocate a glyph buffer no smaller than (1920÷32)×(1080÷15)×225=~1 Mpixels.
+          of 1 and the default tts:fontSize of 1c are used, the font size relative to the root container height is 1/15 , and
+          the maximum number of distinct glyphs that can be buffered is 1÷(1÷15)^2=225 glyphs.
         </aside>
 
         <aside class="example"><div class="example-title"><span>Example 8</span></div>
-          GCpy effectively sets a limit on animating glyphs. For example, assuming that the root container is ultimately rendered
+          GCpy effectively sets a limit on animating text. For example, assuming that the root container is ultimately rendered
           at 1920×1080 resolution and no regions need to have background color painted (so only a CLEAR(E<sub>n</sub>) operation
           is required for the normalized drawing area for the <a href="#dfn-intermediate-synchronic-document" class="internalDFN" data-link-type="dfn">intermediate synchronic document</a>), a GCpy and BDraw of 12 s-1
-          would mean that a group of 160 glyphs with a tts:fontSize equal to 5% of the root container height could be moved at most
+          would mean that a group of 160 <a data-lt="glyph" href="#dfn-glyph" class="internalDFN" data-link-type="dfn">glyphs</a> with a tts:fontSize equal to 5% of the root container height could be moved at most
           approximately 12 s<sup>-1</sup> ÷ (1 + ( 160 × 0.05<sup>2</sup> )) = 8.6 times per second.
         </aside>
 
         <aside class="example"><div class="example-title"><span>Example 9</span></div>
-          Ren(G<sub>i</sub>) effectively sets a limit on the glyph rendering rate. For example, assuming that the root container is
-          ultimately rendered at a 1920×1080 resolution, a Ren(G<sub>i</sub>) of 1.2 s-1 would mean that at most 120 glyphs with a
+          Ren(G<sub>i</sub>) effectively sets a limit on the text rendering rate. For example, assuming that the root container is
+          ultimately rendered at a 1920×1080 resolution, a Ren(G<sub>i</sub>) of 1.2 s-1 would mean that at most 120 <a data-lt="glyph" href="#dfn-glyph" class="internalDFN" data-link-type="dfn">glyphs</a> with a
           fontSize of 108 px (10% of 1080 px and NRGA(G<sub>i</sub>) = 0.01) could be rendered every second.
         </aside>
       </section>
@@ -3463,9 +3473,59 @@
 		
 
 	</section>
-
-
-<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">H. </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">H.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>
+	
+		
+	<section class="appendix" id="simple-scripts" typeof="bibo:Chapter" resource="#simple-scripts" property="bibo:hasPart">
+    <!--OddPage--><h2 id="h-simple-scripts" resource="#h-simple-scripts"><span property="xhv:role" resource="xhv:heading"><span class="secno">H. </span>Simple Scripts</span></h2>
+		
+		<p>The following table refers to the value of the script property associated with Unicode characters.</p>
+		
+      <table class="simple">
+        <thead>
+          <tr>
+            <th>Simple scripts</th>
+
+          </tr>
+        </thead>
+
+        <tbody>
+
+
+          <tr>
+
+            <td>
+							Latin
+            </td>
+          </tr>
+					
+					          <tr>
+
+            <td>
+							Hebrew
+            </td>
+          </tr>
+					
+										          <tr>
+
+            <td>
+							Cyrillic
+            </td>
+          </tr>
+					
+															          <tr>
+
+            <td>
+							Greek
+            </td>
+          </tr>
+        </tbody>
+      </table>
+		
+
+	</section>
+
+
+<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">I. </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">I.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-PNG">[PNG]</dt><dd>Tom Lane. <a href="http://www.w3.org/TR/PNG" property="dc:requires"><cite>Portable Network Graphics (PNG) Specification (Second Edition)</cite></a>. 10 November 2003. W3C Recommendation. URL: <a href="http://www.w3.org/TR/PNG" property="dc:requires">http://www.w3.org/TR/PNG</a>
 </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>
@@ -3474,7 +3534,7 @@
 </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">H.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></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">I.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)
--- a/ttml-ww-profiles/ttml-ww-profiles.source.html	Fri Oct 30 13:49:59 2015 +0900
+++ b/ttml-ww-profiles/ttml-ww-profiles.source.html	Sat Oct 31 12:02:25 2015 -0700
@@ -2070,7 +2070,7 @@
 
     <section>
 
-        <h3>Overview</h3>
+        <h3>Overview (non-normative)</h3>
 
         <p>This Section specifies the Hypothetical Render Model illustrated in <a href="#fig-hypothetical-render-model"></a>.</p>
 
@@ -2273,7 +2273,7 @@
           D<sub>n</sub> to the Presentation Buffer P<sub>n</sub> using the Image Copier; or</li>
 
           <li>if an identical image is present in Decoded Image Buffer D<sub>n-1</sub>, i.e. an identical image was present in <a>
-            intermediate synchronic document</a> E<sub>n-1</sub>, copy using the Image Copier the glyph from Decoded Image Buffer
+            intermediate synchronic document</a> E<sub>n-1</sub>, copy using the Image Copier the image from Decoded Image Buffer
             D<sub>n-1</sub> to both the Decoded Image Buffer D<sub>n</sub> and the Presentation Buffer P<sub>n</sub>; or
           </li>
 
@@ -2354,25 +2354,11 @@
 
       <section id='paint-text'>
         <h3>Paint Text</h3>
-
-        <p>For each glyph displayed in <a>intermediate synchronic document</a> E<sub>n</sub>, the Presentation Compositor
-        SHALL:</p>
-
-        <ul>
-          <li>if an identical glyph is present in Glyph Buffer G<sub>n</sub>, copy the glyph from Glyph Buffer G<sub>n</sub> to the
-          Presentation Buffer P<sub>n</sub> using the Glyph Copier; or</li>
-
-          <li>if an identical glyph is present in Glyph Buffer G<sub>n-1</sub>, i.e. an identical glyph was present in intermediate
-          synchronic document E<sub>n-1</sub>, copy using the Glyph Copier the glyph from Glyph Buffer G<sub>n-1</sub> to both the
-          Glyph Buffer G<sub>n</sub> and the Presentation Buffer P<sub>n</sub>; or</li>
-
-          <li>otherwise render using the Glyph Renderer the glyph into the Presentation Buffer P<sub>n</sub> and Glyph Buffer
-          G<sub>n</sub> using the corresponding style information.</li>
-        </ul>
-
-        <p>Two glyphs are identical if and only if the following [[!TTML1]] styles are identical:</p>
-
-        <ul>
+				
+				<p>In the context of this section, a <dfn>glyph</dfn> is a tuple consisting of (i) one character and (ii) the computed values of the following
+				style properties:
+				
+				<ul>				
           <li><code>tts:color</code></li>
 
           <li><code>tts:fontFamily</code></li>
@@ -2387,6 +2373,27 @@
 
           <li><code>tts:textOutline</code></li>
         </ul>
+				
+				</p>
+				
+				<p class='note'>In complex scripts, the mapping from character to typographical glyph is not one-to-one. For instance, a given arabic character can 
+				yield multiple glyphs depending on its position in a word. The Hypothetical Render Model however assumes a one-to-one mapping 
+				and accounts for complex scripts by reducing the performance of the glyph buffer.</p>
+				
+        <p>For each <a>glyph</a> associated with a character in a <a>presented region</a> of <a>intermediate synchronic document</a> E<sub>n</sub>,
+				the Presentation Compositor SHALL:</p>
+
+        <ul>				
+          <li>if an identical <a>glyph</a> is present in Glyph Buffer G<sub>n</sub>, copy the <a>glyph</a> from Glyph Buffer G<sub>n</sub> to the
+          Presentation Buffer P<sub>n</sub> using the Glyph Copier; or</li>
+
+          <li>if an identical <a>glyph</a> is present in Glyph Buffer G<sub>n-1</sub>, i.e. an identical <a>glyph</a> was present in <a>intermediate
+          synchronic document</a> E<sub>n-1</sub>, copy using the Glyph Copier the <a>glyph</a> from Glyph Buffer G<sub>n-1</sub> to both the
+          Glyph Buffer G<sub>n</sub> and the Presentation Buffer P<sub>n</sub>; or</li>
+
+          <li>otherwise render using the Glyph Renderer the <a>glyph</a> into the Presentation Buffer P<sub>n</sub> and Glyph Buffer
+          G<sub>n</sub>.</li>
+        </ul>
 
         <figure>
           <img src="text-render-example-figure-2.png" alt="Example of Presentation Compositor Behavior for Text Rendering" height=
@@ -2397,108 +2404,110 @@
           </figcaption>
         </figure>
 
-        <p>The duration DUR<sub>T</sub>(E<sub>n</sub>) for painting the text of an <a>intermediate synchronic document</a>
+        <p>The duration DUR<sub>T</sub>(E<sub>n</sub>) for rendering the text of an <a>intermediate synchronic document</a>
         E<sub>n</sub> in the Presentation Buffer is as follows:</p>
 
-        <p class="equation">DUR<sub>T</sub>(E<sub>n</sub>) = ∑<sub>G<sub>i</sub> ∈ G<sub>r</sub></sub> NRGA(G<sub>i</sub>) / Ren(G<sub>i</sub>)
-        + ∑<sub>G<sub>j</sub> ∈ G<sub>c</sub></sub> NRGA(G<sub>j</sub>) / GCpy</p>
+        <p class="equation">DUR<sub>T</sub>(E<sub>n</sub>) = ∑<sub>g<sub>i</sub> ∈ &#x393;<sub>r</sub></sub> NRGA(g<sub>i</sub>) / Ren(g<sub>i</sub>)
+        + ∑<sub>g<sub>j</sub> ∈ &#x393;<sub>c</sub></sub> NRGA(g<sub>j</sub>) / GCpy</p>
 
         <p>where</p>
 
         <ul>
-          <li>G<sub>r</sub> is the set of glyphs rendered into the Presentation Buffer P<sub>n</sub> using the Glyph Renderer in
+          <li>&#x393;<sub>r</sub> is the set of <a data-lt="glyph">glyphs</a> rendered into the Presentation Buffer P<sub>n</sub> using the Glyph Renderer in
           <a>intermediate synchronic document</a> E<sub>n</sub>;
           </li>
 
-          <li>G<sub>c</sub> is the set of glyphs copied to the Presentation Buffer P<sub>n</sub> using the Glyph Copier in
+          <li>&#x393;<sub>c</sub> is the set of <a data-lt="glyph">glyphs</a> copied to the Presentation Buffer P<sub>n</sub> using the Glyph Copier in
           <a>intermediate synchronic document</a> E<sub>n</sub>;
           </li>
 
-          <li>Ren(G<sub>i</sub>) is the text rendering performance factor glyph G<sub>i</sub>; and</li>
+          <li>Ren(g<sub>i</sub>) is the text rendering performance factor for <a>glyph</a> g<sub>i</sub>; and</li>
 
           <li>GCpy is the normalized glyph copy performance factor.</li>
         </ul>
 
-        <p>G<sub>r</sub> and G<sub>c</sub> SHALL include only glyphs in <a data-lt="presented region">presented regions</a> and SHALL
-        NOT include a [[!UNICODE]] Code Point if it does not result in a change to presentation, e.g. the Code Point is
-        ignored.</p>
-
-        <p>The Normalized Rendered Glyph Area NRGA(G<sub>i</sub>) of a glyph G<sub>i</sub> SHALL be equal to:</p>
-
-        <p class="equation">NRGA(G<sub>i</sub>)= (fontSize of G<sub>i</sub> as percentage of root container height)<sup>2</sup></p>
+        <p>The Normalized Rendered Glyph Area NRGA(g<sub>i</sub>) of a <a>glyph</a> g<sub>i</sub> SHALL be equal to:</p>
+
+        <p class="equation">NRGA(g<sub>i</sub>) = (fontSize of g<sub>i</sub> as percentage of root container height)<sup>2</sup></p>
 
         <p>The contents of the Glyph Buffer G<sub>n</sub> SHALL be copied instantaneously to Glyph Buffer G<sub>n-1</sub> at the
         presentation time of <a>intermediate synchronic document</a> E<sub>n</sub>.</p>
 
-        <p>The total size occupied by the glyphs stored in Glyph Buffers G<sub>n</sub> or G<sub>n-1</sub> SHALL be the sum of their
-        Normalized Rendered Glyph Area.</p>
-
-        <p>The size of Glyph Buffers G<sub>n</sub> and G<sub>n-1</sub> SHALL be the Normalized Glyph Buffer Size (NGBS).</p>
-
-        <p>Unless specified otherwise, the following table SHALL specify GCpy, Ren and NGBS, and SHALL apply to all supported font
-        styles (including provision of outline border).</p>
+        <p>It SHALL be an error for the sum of NRGA(g<sub>i</sub>) over all <a data-lt="glyph">glyphs</a> Glyph Buffer G<sub>n</sub> to be larger
+				than the Normalized Glyph Buffer Size (NGBS).</p>
+
+        <p>Unless specified otherwise, the following table specifies values of GCpy, Ren and NGBS.</p>
 
         <table class='simple'>
           <thead>
             <tr>
-              <th>Parameter</th>
-
-              <th>Initial value</th>
+              <th style="text-align: center;">Parameter</th>
+							
+							<th style="text-align: center;">Condition</th>
+
+              <th style="text-align: center;">Initial value</th>
             </tr>
           </thead>
 
           <tbody>
             <tr>
-              <td>Normalized glyph copy performance factor (GCpy)</td>
+              <td rowspan="2">Normalized glyph copy performance factor (GCpy)</td>
+							
+							<td>The character of g<sub>i</sub> belongs to a simple script as specified in <a href="#simple-scripts"></a></td>
 
               <td>12</td>
             </tr>
+						
+            <tr>
+							
+							<td>otherwise</td>
+
+              <td>3</td>
+            </tr>
 
             <tr>
-              <td>Text rendering performance factor Ren(G<sub>i</sub> if G<sub>i</sub> is not a CJK Unified Ideograph as specified
-              in [[!UNICODE]].</td>
-
-              <td>1.2</td>
-            </tr>
-
-            <tr>
-              <td>Text rendering performance factor Ren(G<sub>i</sub>) if G<sub>i</sub> is a CJK Unified Ideograph as specified in
-              [[!UNICODE]].</td>
+              <td rowspan="2">Text rendering performance factor Ren(G<sub>i</sub>)</td>
+							<td>The character of g<sub>i</sub> belongs to the CJK Unified Ideograph block as specified in [[!UNICODE]]</td>
 
               <td>0.6</td>
             </tr>
 
             <tr>
-              <td>Normalized Glyph Buffer Size (NGBS)</td>
+              <td>otherwise</td>
+
+              <td>1.2</td>
+            </tr>
+
+            <tr>
+              <td colspan="2">Normalized Glyph Buffer Size (NGBS)</td>
 
               <td>1</td>
             </tr>
           </tbody>
         </table>
 
-        <p class='note'>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
+        <p class='note'>NRGA(G<sub>i</sub>) does not take into account decorations (e.g. underline), effects (e.g.
+        outline) or actual typographical glyph aspect ratio. An implementation can determine an actual buffer size needs based on worst-case
         glyph size complexity.</p>
 
         <aside class='example'>
-          Setting a Normalized Glyph Buffer Size effectively sets a limit on the total number of distinct glyphs present in any
+          Setting a Normalized Glyph Buffer Size effectively sets a limit on the total number of distinct <a data-lt="glyph">glyphs</a> present in any
           given <a>intermediate synchronic document</a> E<sub>n</sub>. For example, assuming a maximum Normalized Glyph Buffer Size
-          of 1 and the default tts:fontSize of 1c are used, the glyph's height as percentage of root container height is 1/15 , and
-          the maximum number of distinct glyphs that can be buffered is 1÷(1÷15)^2=225 glyphs. In this example, an implementation
-          rendering at 1920x1080 would need to allocate a glyph buffer no smaller than (1920÷32)×(1080÷15)×225=~1 Mpixels.
+          of 1 and the default tts:fontSize of 1c are used, the font size relative to the root container height is 1/15 , and
+          the maximum number of distinct glyphs that can be buffered is 1÷(1÷15)^2=225 glyphs.
         </aside>
 
         <aside class='example'>
-          GCpy effectively sets a limit on animating glyphs. For example, assuming that the root container is ultimately rendered
+          GCpy effectively sets a limit on animating text. For example, assuming that the root container is ultimately rendered
           at 1920×1080 resolution and no regions need to have background color painted (so only a CLEAR(E<sub>n</sub>) operation
           is required for the normalized drawing area for the <a>intermediate synchronic document</a>), a GCpy and BDraw of 12 s-1
-          would mean that a group of 160 glyphs with a tts:fontSize equal to 5% of the root container height could be moved at most
+          would mean that a group of 160 <a data-lt="glyph">glyphs</a> with a tts:fontSize equal to 5% of the root container height could be moved at most
           approximately 12 s<sup>-1</sup> ÷ (1 + ( 160 × 0.05<sup>2</sup> )) = 8.6 times per second.
         </aside>
 
         <aside class='example'>
-          Ren(G<sub>i</sub>) effectively sets a limit on the glyph rendering rate. For example, assuming that the root container is
-          ultimately rendered at a 1920×1080 resolution, a Ren(G<sub>i</sub>) of 1.2 s-1 would mean that at most 120 glyphs with a
+          Ren(G<sub>i</sub>) effectively sets a limit on the text rendering rate. For example, assuming that the root container is
+          ultimately rendered at a 1920×1080 resolution, a Ren(G<sub>i</sub>) of 1.2 s-1 would mean that at most 120 <a data-lt="glyph">glyphs</a> with a
           fontSize of 108 px (10% of 1080 px and NRGA(G<sub>i</sub>) = 0.01) could be rendered every second.
         </aside>
       </section>
@@ -3114,5 +3123,55 @@
 		
 
 	</section>
+	
+		
+	<section class='appendix' id='simple-scripts'>
+    <h2>Simple Scripts</h2>
+		
+		<p>The following table refers to the value of the script property associated with Unicode characters.</p>
+		
+      <table class='simple'>
+        <thead>
+          <tr>
+            <th>Simple scripts</th>
+
+          </tr>
+        </thead>
+
+        <tbody>
+
+
+          <tr>
+
+            <td>
+							Latin
+            </td>
+          </tr>
+					
+					          <tr>
+
+            <td>
+							Hebrew
+            </td>
+          </tr>
+					
+										          <tr>
+
+            <td>
+							Cyrillic
+            </td>
+          </tr>
+					
+															          <tr>
+
+            <td>
+							Greek
+            </td>
+          </tr>
+        </tbody>
+      </table>
+		
+
+	</section>
 </body>
 </html>