--- a/ttml10-sdp-us/Overview.html Wed May 08 14:15:04 2013 -0600
+++ b/ttml10-sdp-us/Overview.html Wed May 08 16:05:29 2013 -0600
@@ -239,12 +239,6 @@
color: #ff4500;
}
-
-/* --- --- */
-ol.algorithm { counter-reset:numsection; list-style-type: none; }
-ol.algorithm li { margin: 0.5em 0; }
-ol.algorithm li:before { font-weight: bold; counter-increment: numsection; content: counters(numsection, ".") ") "; }
-
/* --- TOC --- */
.toc a, .tof a {
text-decoration: none;
@@ -347,7 +341,7 @@
color: #b9ab2d;
}
div.issue-title { color: #e05252; }
-div.note-title { color: #52e052; }
+div.note-title { color: #2b2; }
div.issue-title span, div.note-title span {
text-transform: uppercase;
}
@@ -362,7 +356,7 @@
border-left-style: solid;
}
div.issue, div.note {
- padding: 0.5em;
+ padding: 1em 1.2em 0.5em;
margin: 1em 0;
position: relative;
clear: both;
@@ -379,42 +373,41 @@
}
-</style><link rel="stylesheet" href="http://www.w3.org/StyleSheets/TR/W3C-ED"><!--[if lt IE 9]><script src='http://www.w3.org/2008/site/js/html5shiv.js'></script><![endif]--></head>
-<body><div class="head">
+</style><link rel="stylesheet" href="http://www.w3.org/StyleSheets/TR/W3C-WG-NOTE"><!--[if lt IE 9]><script src='http://www.w3.org/2008/site/js/html5shiv.js'></script><![endif]--></head>
+<body class="h-entry"><div class="head">
<p>
<a href="http://www.w3.org/"><img width="72" height="48" src="http://www.w3.org/Icons/w3c_home" alt="W3C"></a>
</p>
- <h1 class="title" id="title">TTML Simple Delivery Profile for Closed Captions (US)</h1>
+ <h1 class="title p-name" id="title">TTML Simple Delivery Profile for Closed Captions (US)</h1>
<h2 id="subtitle">A profile of TTML for internet delivery of Captions originated in the United States</h2>
- <h2 id="w3c-editor-s-draft-31-january-2013"><abbr title="World Wide Web Consortium">W3C</abbr> Editor's Draft 31 January 2013</h2>
+ <h2 id="w3c-working-group-note-08-may-2013"><abbr title="World Wide Web Consortium">W3C</abbr> Working Group Note <time class="dt-published" datetime="2013-05-08">08 May 2013</time></h2>
<dl>
<dt>This version:</dt>
- <dd><a href="http://dvcs.w3.org/hg/ttml/raw-file/default/ttml10-sdp-us/Overview.html">http://dvcs.w3.org/hg/ttml/raw-file/default/ttml10-sdp-us/Overview.html</a></dd>
+ <dd><a class="u-url" href="http://www.w3.org/TR/2013/NOTE-ttml10-sdp-us-20130508/">http://www.w3.org/TR/2013/NOTE-ttml10-sdp-us-20130508/</a></dd>
<dt>Latest published version:</dt>
<dd><a href="http://www.w3.org/TR/ttml10-sdp-us/">http://www.w3.org/TR/ttml10-sdp-us/</a></dd>
- <dt>Latest editor's draft:</dt>
- <dd><a href="http://dvcs.w3.org/hg/ttml/raw-file/default/ttml10-sdp-us/Overview.html">http://dvcs.w3.org/hg/ttml/raw-file/default/ttml10-sdp-us/Overview.html</a></dd>
-
-
+ <dt>Previous version:</dt>
+ <dd><a href="http://www.w3.org/TR/2013/NOTE-ttml10-sdp-us-20130205/">http://www.w3.org/TR/2013/NOTE-ttml10-sdp-us-20130205/</a></dd>
<dt>Editors:</dt>
- <dd><span>Glenn Adams</span>, <a href="http://www.cox.com/">Cox Communications, Inc.</a></dd>
-<dd><span>Monica Martin</span>, <a href="http://www.microsoft.com/">Microsoft Open Technologies, Inc.</a></dd>
-<dd><span>Sean Hayes</span>, <a href="http://www.microsoft.com/">Microsoft</a></dd>
+ <dd class="p-author h-card vcard"><span class="p-name fn">Glenn Adams</span>, <a class="p-org org h-org h-card" href="http://www.cox.com/">Cox Communications, Inc.</a></dd>
+<dd class="p-author h-card vcard"><span class="p-name fn">Monica Martin</span>, <a class="p-org org h-org h-card" href="http://www.microsoft.com/">Microsoft Open Technologies, Inc.</a></dd>
+<dd class="p-author h-card vcard"><span class="p-name fn">Sean Hayes</span>, <a class="p-org org h-org h-card" href="http://www.microsoft.com/">Microsoft</a></dd>
+
</dl>
@@ -428,7 +421,7 @@
<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>,
<a href="http://www.ercim.eu/"><abbr title="European Research Consortium for Informatics and Mathematics">ERCIM</abbr></a>,
- <a href="http://www.keio.ac.jp/">Keio</a>), All Rights Reserved.
+ <a href="http://www.keio.ac.jp/">Keio</a>, <a href="http://ev.buaa.edu.cn/">Beihang</a>), All Rights Reserved.
<abbr title="World Wide Web Consortium">W3C</abbr> <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>,
<a href="http://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and
<a href="http://www.w3.org/Consortium/Legal/copyright-documents">document use</a> rules apply.
@@ -442,7 +435,7 @@
<p>The primary goal of the profile defined herein is to establish a minimum level of interoperability between
[<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>] and legacy caption formats employed in US markets, such as [<cite><a class="bibref" href="#bib-CEA608">CEA608</a></cite>] and [<cite><a class="bibref" href="#bib-CEA708">CEA708</a></cite>]. This is accomplished by
(1) defining a set of constraints that apply to TTML document instances that claim adherence to this profile, and
-(2) defining a set of mandatory features and behaviors that <em class="rfc2119" title="must">must</em> be supported by implementations of a TTML
+(2) defining a set of mandatory features and behaviors that <em class="rfc2119" title="MUST">MUST</em> be supported by implementations of a TTML
Presentation Processor that claim adherence to this profile.</p>
</section><section id="sotd" class="introductory"><h2>Status of This Document</h2>
@@ -463,7 +456,7 @@
</ol>
<p>
- This document was published by the <a href="http://www.w3.org/AudioVideo/TT/">Timed Text Working Group</a> as an Editor's Draft.
+ This document was published by the <a href="http://www.w3.org/AudioVideo/TT/">Timed Text Working Group</a> as a Working Group Note.
If you wish to make comments regarding this document, please send them to
@@ -478,7 +471,7 @@
</p><p>
- Publication as an Editor's Draft does not imply endorsement by the <abbr title="World Wide Web Consortium">W3C</abbr> Membership.
+ Publication as a Working Group Note does not imply endorsement by the <abbr title="World Wide Web Consortium">W3C</abbr> Membership.
This is a draft document and may be updated, replaced or obsoleted by other documents at
any time. It is inappropriate to cite this document as other than work in progress.
</p>
@@ -511,7 +504,7 @@
<section id="introduction">
<!--OddPage--><h2><span class="secno">1. </span>Introduction</h2>
<p>TTML 1.0 [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>] provides many features to satisfy captioning and subtitling requirements, not all of which are intended for end user display. Requirements have been identified by key video and content communities to define an interoperable delivery profile using the core features specifically designed for online presentation of TTML. Such a profile allows the community of TTML users to construct constrained presentation engines for TTML. This document defines the behavior expected of a TTML content player using the presentation processor constraints for such an online delivery profile.</p>
-<div class="note"><div class="note-title"><span>Note</span></div><p class="">At the time of publication, this profile normatively refers to [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>], and informatively refers to [<cite><a class="bibref" href="#bib-TTML10SE">TTML10SE</a></cite>]. The most recently
+<div class="note"><div class="note-title" role="heading" aria-level="3"><span>Note</span></div><p class="">At the time of publication, this profile normatively refers to [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>], and informatively refers to [<cite><a class="bibref" href="#bib-TTML10SE">TTML10SE</a></cite>]. The most recently
published version of TTML should take precedence as the definitive reference.</p></div>
<p>The Simple Online Delivery profile is focused on streamlined delivery of closed captions on the Internet. This interoperability profile supports core TTML features to deliver legacy formats such as [<cite><a class="bibref" href="#bib-CEA608">CEA608</a></cite>] and [<cite><a class="bibref" href="#bib-CEA708">CEA708</a></cite>] content, and, as such, is targeted primarily for use in US markets.</p>
<p>The Simple Delivery Profile for Closed Captions focuses on interoperability using [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>] to support delivery of closed captions for video content. Other profiles based on [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>] may target other types of subtitles such as on-screen text or graphics. This interoperability profile is a proper subset of [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>] intended to support features required for US Government closed captioning requirements for online presentation.</p>
@@ -536,7 +529,7 @@
<p>When this document refers to a TTML element type and no namespace prefix is specified, then the <code>tt</code>
namespace prefix is implied. This prefix and other explicit namespace prefixes used herein correspond to those
TTML namespaces defined in [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>] Section 5.1.</p>
-<div class="note"><div class="note-title"><span>Note</span></div><p class="">In the examples in this document, standard TTML namespace prefixes are abbreviated for brevity, without loss of generality.</p></div>
+<div class="note"><div class="note-title" role="heading" aria-level="3"><span>Note</span></div><p class="">In the examples in this document, standard TTML namespace prefixes are abbreviated for brevity, without loss of generality.</p></div>
</section>
<section id="conformance"><!--OddPage--><h2><span class="secno">3. </span>Conformance</h2>
<p>
@@ -545,8 +538,8 @@
normative.
</p>
<p>
- The key words <em class="rfc2119" title="must">must</em>, <em class="rfc2119" title="must not">must not</em>, <em class="rfc2119" title="required">required</em>, <em class="rfc2119" title="should">should</em>, <em class="rfc2119" title="should not">should not</em>, <em class="rfc2119" title="recommended">recommended</em>, <em class="rfc2119" title="may">may</em>,
- and <em class="rfc2119" title="optional">optional</em> in this specification are to be interpreted as described in [<cite><a class="bibref" href="#bib-RFC2119">RFC2119</a></cite>].
+ The key words <em class="rfc2119" title="MUST">MUST</em>, <em class="rfc2119" title="MUST NOT">MUST NOT</em>, <em class="rfc2119" title="REQUIRED">REQUIRED</em>, <em class="rfc2119" title="SHOULD">SHOULD</em>, <em class="rfc2119" title="SHOULD NOT">SHOULD NOT</em>, <em class="rfc2119" title="RECOMMENDED">RECOMMENDED</em>, <em class="rfc2119" title="MAY">MAY</em>,
+ and <em class="rfc2119" title="OPTIONAL">OPTIONAL</em> in this specification are to be interpreted as described in [<cite><a class="bibref" href="#bib-RFC2119">RFC2119</a></cite>].
</p>
<p>This profile defines (1) constraints on documents and (2) minimum requirements for a TTML presentation processor capable of presenting such constrained
@@ -564,7 +557,7 @@
<li>implements support for all other semantics explicitly defined by this profile.</li>
</ol>
<p>The semantics defined in [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>] apply unless otherwise constrained in this profile.</p>
-<p>Claims of document conformance <em class="rfc2119" title="must">must</em> make use of the following profile URI, identified with the indicated profile name:</p>
+<p>Claims of document conformance <em class="rfc2119" title="MUST">MUST</em> make use of the following profile URI, identified with the indicated profile name:</p>
<table>
<tbody><tr>
<th>Profile Name</th>
@@ -580,25 +573,25 @@
<li>use of other features defined in [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>], in which case such behavior is not defined here; or</li>
<li>use of other profiles that may implement the features in this profile.</li>
</ol>
-<div class="note"><div class="note-title"><span>Note</span></div><p class="">Error handling behavior is described in <a href="#error_handling">Error Handling</a>.</p></div>
+<div class="note"><div class="note-title" role="heading" aria-level="3"><span>Note</span></div><p class="">Error handling behavior is described in <a href="#error_handling">Error Handling</a>.</p></div>
</section>
<section class="Structural_Constraints" id="structural-constraints">
<!--OddPage--><h2><span class="secno">4. </span>Structural Constraints</h2>
-<div><div class="numbered constraint" title="R0001">A document <em class="rfc2119" title="must">must</em> contain a <code>tt</code> element.</div></div>
-<div><div class="numbered constraint" title="R0002">A document <em class="rfc2119" title="must">must</em> contain both a <code>head</code> and <code>body</code> element.</div></div>
-<div><div class="numbered constraint" title="R0003">A document <em class="rfc2119" title="must">must</em> contain both a <code>styling</code> and a <code>layout</code> element.</div></div>
-<div><div class="numbered constraint" title="R0004">A document <em class="rfc2119" title="must not">must not</em> contain a <code>div</code> element which has a descendant <code>div</code> element.</div></div>
-<div><div class="numbered constraint" title="R0005">A document <em class="rfc2119" title="must not">must not</em> contain a <code>span</code> element which has a descendant <code>span</code> element.</div></div>
+<div><div class="numbered constraint" title="R0001">A document <em class="rfc2119" title="MUST">MUST</em> contain a <code>tt</code> element.</div></div>
+<div><div class="numbered constraint" title="R0002">A document <em class="rfc2119" title="MUST">MUST</em> contain both a <code>head</code> and <code>body</code> element.</div></div>
+<div><div class="numbered constraint" title="R0003">A document <em class="rfc2119" title="MUST">MUST</em> contain both a <code>styling</code> and a <code>layout</code> element.</div></div>
+<div><div class="numbered constraint" title="R0004">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> contain a <code>div</code> element which has a descendant <code>div</code> element.</div></div>
+<div><div class="numbered constraint" title="R0005">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> contain a <code>span</code> element which has a descendant <code>span</code> element.</div></div>
<div><div class="numbered" title="E0001">Single level of spans.</div></div>
<div class="example"><div class="example-title"><span>Example 1</span></div><pre class="example" style="font-family: monospace; font-size: 10pt; color: black; background: white;"><span style="color: blue;"><</span><span style="color: #a31515;">span</span><span style="color: blue;"> </span><span style="color: red;">style</span><span style="color: blue;">=</span>"<span style="color: blue;">s1</span>"<span style="color: blue;">></span>A<span style="color: blue;"></</span><span style="color: #a31515;">span</span><span style="color: blue;">></span>
<span style="color: blue;"><</span><span style="color: #a31515;">span</span><span style="color: blue;"> </span><span style="color: red;">style</span><span style="color: blue;">=</span>"<span style="color: blue;">s3</span>"<span style="color: blue;">></span>B<span style="color: blue;"></</span><span style="color: #a31515;">span</span><span style="color: blue;">></span>
<span style="color: blue;"><</span><span style="color: #a31515;">span</span><span style="color: blue;"> </span><span style="color: red;">style</span><span style="color: blue;">=</span>"<span style="color: blue;">s1</span>"<span style="color: blue;">></span>C<span style="color: blue;"></</span><span style="color: #a31515;">span</span><span style="color: blue;">></span></pre></div>
-<div><div class="numbered constraint" title="R0006">A document <em class="rfc2119" title="must not">must not</em> contain two elements such that the lexical order of the elements is different than the temporal
+<div><div class="numbered constraint" title="R0006">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> contain two elements such that the lexical order of the elements is different than the temporal
order of the elements.</div></div>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>This constraint is intended to limit the lexical order of elements to match the temporal order of the active duration of these elements.</p></div></div>
+<div class="note"><div class="note-title" role="heading" aria-level="3"><span>Note</span></div><div class=""><p>This constraint is intended to limit the lexical order of elements to match the temporal order of the active duration of these elements.</p></div></div>
<section id="Use_of_Constrained_TTML_Feature_content">
<h3><span class="secno">4.1 </span>Use of Constrained TTML Feature <span>#content</span></h3>
-<div><div class="numbered constraint" title="R0007">A document that is claimed to be <em>strictly</em> conformant <em class="rfc2119" title="must not">must not</em> contain an
+<div><div class="numbered constraint" title="R0007">A document that is claimed to be <em>strictly</em> conformant <em class="rfc2119" title="MUST NOT">MUST NOT</em> contain an
element that is not one of the following element types:</div></div>
<ul>
<li><code>tt</code></li>
@@ -622,9 +615,9 @@
</section>
<section id="Use_of_Constrained_TTML_Feature_content_profile">
<h3><span class="secno">4.2 </span>Use of Constrained TTML Feature <span>#profile</span></h3>
-<div><div class="numbered constraint" title="R0008">A document <em class="rfc2119" title="must">must</em> contain a <code>ttp:profile</code> element where the <code>use</code> attribute of that element is specified as <code>http://www.w3.org/ns/ttml/profile/sdp-us</code>.</div></div>
-<div><div class="numbered constraint" title="R0009">A presentation processor <em class="rfc2119" title="must">must</em> support the profile identified by the URI <code>http://www.w3.org/ns/ttml/profile/sdp-us</code> as defined by <a href="#Features_in_TTML_1.0_Used">Features in TTML 1.0 Used in This Profile</a>.</div></div>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>See also <a href="#conformance">Conformance</a>. [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>] allows zero or more profiles (<code>ttp:profile</code> in the <code>head</code> element) to be specified and used simultaneously.</p></div></div>
+<div><div class="numbered constraint" title="R0008">A document <em class="rfc2119" title="MUST">MUST</em> contain a <code>ttp:profile</code> element where the <code>use</code> attribute of that element is specified as <code>http://www.w3.org/ns/ttml/profile/sdp-us</code>.</div></div>
+<div><div class="numbered constraint" title="R0009">A presentation processor <em class="rfc2119" title="MUST">MUST</em> support the profile identified by the URI <code>http://www.w3.org/ns/ttml/profile/sdp-us</code> as defined by <a href="#Features_in_TTML_1.0_Used">Features in TTML 1.0 Used in This Profile</a>.</div></div>
+<div class="note"><div class="note-title" role="heading" aria-level="4"><span>Note</span></div><div class=""><p>See also <a href="#conformance">Conformance</a>. [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>] allows zero or more profiles (<code>ttp:profile</code> in the <code>head</code> element) to be specified and used simultaneously.</p></div></div>
</section>
</section>
<section id="Style_Constraints">
@@ -633,13 +626,13 @@
<section id="Constrained_TTML_Feature_backgroundColor">
<h3><span class="secno">5.1 </span>Use of Constrained TTML Feature <span>#backgroundColor-*</span></h3>
<p></p>
-<div><div class="numbered constraint" title="R0010">A document <em class="rfc2119" title="must not">must not</em> contain a <strong><color></strong> expression value used with the
+<div><div class="numbered constraint" title="R0010">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> contain a <strong><color></strong> expression value used with the
<code>tts:backgroundColor</code> attribute that does not conform to the <code>#rrggbbaa</code> expression format as defined by
[<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>], Section 8.3.2.</div></div>
-<div><div class="numbered constraint" title="R0011">A presentation processor <em class="rfc2119" title="must">must</em> support the colors specified in <a href="#color-values">Color Values</a> for use
+<div><div class="numbered constraint" title="R0011">A presentation processor <em class="rfc2119" title="MUST">MUST</em> support the colors specified in <a href="#color-values">Color Values</a> for use
with the <code>tts:backgroundColor</code> attribute.</div></div>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>These colors are identical to those identified in the CEA708-D, Section 8.8 [RBG resolution of 4 bits for each primary].</p></div></div>
-<div><div class="numbered constraint" title="R0012">A document <em class="rfc2119" title="must not">must not</em> contain a <code>region</code> element where the value of the alpha component of the region's computed value for the
+<div class="note"><div class="note-title" role="heading" aria-level="4"><span>Note</span></div><div class=""><p>These colors are identical to those identified in the CEA708-D, Section 8.8 [RBG resolution of 4 bits for each primary].</p></div></div>
+<div><div class="numbered constraint" title="R0012">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> contain a <code>region</code> element where the value of the alpha component of the region's computed value for the
<code>tts:backgroundColor</code> property is not zero (0).</div></div>
<div><div class="numbered" title="E0002">Multiple Background Styles. The <code>tts:backgroundColor</code> is specified distinctly for a region, a paragraph selected into
that region, and a span of text in that paragraph.</div></div>
@@ -652,22 +645,22 @@
</section>
<section id="Constrained_TTML_Feature_color">
<h3><span class="secno">5.2 </span>Use of Constrained TTML Feature <span>#color</span></h3>
-<div><div class="numbered constraint" title="R0013">A document <em class="rfc2119" title="must not">must not</em> contain a <strong><color></strong> expression value used with the
+<div><div class="numbered constraint" title="R0013">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> contain a <strong><color></strong> expression value used with the
<code>tts:color</code> attribute that does not conform to the <code>#rrggbbaa</code> expression format as defined by
[<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>], Section 8.3.2.</div></div>
-<div><div class="numbered constraint" title="R0014">A presentation processor <em class="rfc2119" title="must">must</em> support the colors specified in <a href="#color-values">Color Values</a> for use
+<div><div class="numbered constraint" title="R0014">A presentation processor <em class="rfc2119" title="MUST">MUST</em> support the colors specified in <a href="#color-values">Color Values</a> for use
with the <code>tts:color</code> attribute.</div></div>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>These colors are identical to those identified in the CEA708-D, Section 8.8 [RBG resolution of 4 bits for each primary].</p></div></div>
+<div class="note"><div class="note-title" role="heading" aria-level="4"><span>Note</span></div><div class=""><p>These colors are identical to those identified in the CEA708-D, Section 8.8 [RBG resolution of 4 bits for each primary].</p></div></div>
</section>
<section id="Constrained_TTML_Feature_extent_region">
<h3><span class="secno">5.3 </span>Use of Constrained TTML Feature <span>#extent-region</span></h3>
-<div><div class="numbered constraint" title="R0015">A document <em class="rfc2119" title="must not">must not</em> contain a <code>region</code> element where the computed values of the <code>tts:origin</code> and
+<div><div class="numbered constraint" title="R0015">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> contain a <code>region</code> element where the computed values of the <code>tts:origin</code> and
<code>tts:extent</code> properties would result in the region extending outside of the root container.</div></div>
-<div><div class="numbered constraint" title="R0016">A presentation processor <em class="rfc2119" title="must">must</em> fix the root container origin so that it corresponds with the top, left corner of the related
+<div><div class="numbered constraint" title="R0016">A presentation processor <em class="rfc2119" title="MUST">MUST</em> fix the root container origin so that it corresponds with the top, left corner of the related
media object [<cite><a class="bibref" href="#bib-TTML10SE">TTML10SE</a></cite>], Section 2.2.</div></div>
-<div><div class="numbered constraint" title="R0017">A presentation processor <em class="rfc2119" title="must">must</em> fix the root container extent so that it corresponds with the extent of the related
+<div><div class="numbered constraint" title="R0017">A presentation processor <em class="rfc2119" title="MUST">MUST</em> fix the root container extent so that it corresponds with the extent of the related
media object [<cite><a class="bibref" href="#bib-TTML10SE">TTML10SE</a></cite>], Section 2.2.</div></div>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>In the context of this document, the related media object [<cite><a class="bibref" href="#bib-TTML10SE">TTML10SE</a></cite>] is assumed to be video media, and, therefore, have an
+<div class="note"><div class="note-title" role="heading" aria-level="4"><span>Note</span></div><div class=""><p>In the context of this document, the related media object [<cite><a class="bibref" href="#bib-TTML10SE">TTML10SE</a></cite>] is assumed to be video media, and, therefore, have an
associated origin and extent on some display device.</p></div></div>
<section class="informative" id="examples">
<h4><span class="secno">5.3.1 </span>Examples</h4><p><em>This section is non-normative.</em></p>
@@ -768,7 +761,7 @@
</section>
<section id="Constrained_TTML_Feature_display_display_fontFamily_generic">
<h3><span class="secno">5.4 </span>Use of Constrained TTML Feature <span>#fontFamily-generic</span></h3>
-<div><div class="numbered constraint" title="R0018">A document <em class="rfc2119" title="must not">must not</em> specify a <code>tts:fontFamily</code> attribute whose value is not one of the following:</div></div>
+<div><div class="numbered constraint" title="R0018">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> specify a <code>tts:fontFamily</code> attribute whose value is not one of the following:</div></div>
<ul>
<li><code>default</code></li>
<li><code>monospaceSerif</code></li>
@@ -779,23 +772,23 @@
<li><code>cursive</code></li>
<li><code>smallCaps</code></li>
</ul>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>Values of <code>tts:fontFamily</code> that do not not correspond to generic font family names in [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>], such as <code>casual</code>, <code>cursive</code> and <code>smallCaps</code>, may be used. These are to be interpreted as local font names, which, if not available, the <code>default</code> font family is to be used.</p></div></div>
+<div class="note"><div class="note-title" role="heading" aria-level="4"><span>Note</span></div><div class=""><p>Values of <code>tts:fontFamily</code> that do not not correspond to generic font family names in [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>], such as <code>casual</code>, <code>cursive</code> and <code>smallCaps</code>, may be used. These are to be interpreted as local font names, which, if not available, the <code>default</code> font family is to be used.</p></div></div>
</section>
<section id="Constrained_TTML_Feature_display_display_fontSize">
<h3><span class="secno">5.5 </span>Use of Constrained TTML Feature <span>#fontSize</span></h3>
-<div><div class="numbered constraint" title="R0019">A document <em class="rfc2119" title="must not">must not</em> specify a <code>tts:fontSize</code> attribute using a value that is not one of the
+<div><div class="numbered constraint" title="R0019">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> specify a <code>tts:fontSize</code> attribute using a value that is not one of the
following values: <code>50%</code>, <code>75%</code>, <code>100%</code>, <code>150%</code> or <code>200%</code>.</div></div>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>Use of a font size of less than 75%, e.g., 50%, may result in unreadable content for the end user.</p></div></div>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>If a specific font size is not supported, then follow the semantics for a presentation processor defined in [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>], Section 8.2.9.</p></div></div>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>Constraining the root container extent to the active video area means that the default
+<div class="note"><div class="note-title" role="heading" aria-level="4"><span>Note</span></div><div class=""><p>Use of a font size of less than 75%, e.g., 50%, may result in unreadable content for the end user.</p></div></div>
+<div class="note"><div class="note-title" role="heading" aria-level="4"><span>Note</span></div><div class=""><p>If a specific font size is not supported, then follow the semantics for a presentation processor defined in [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>], Section 8.2.9.</p></div></div>
+<div class="note"><div class="note-title" role="heading" aria-level="4"><span>Note</span></div><div class=""><p>Constraining the root container extent to the active video area means that the default
font size of 1c and the default cell grid of 32 x 15 (as specified in TTML 1.0) implies an initial font height of 6.67% of the video height.</p></div></div>
</section>
<section id="Constrained_TTML_Feature_styling">
<h3><span class="secno">5.6 </span>Use of Constrained TTML Feature <span>#styling-*</span></h3>
-<div><div class="numbered constraint" title="R0020">A document <em class="rfc2119" title="must not">must not</em> use <strong>chained referential styling</strong> or <strong>nested styling</strong> as defined
+<div><div class="numbered constraint" title="R0020">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> use <strong>chained referential styling</strong> or <strong>nested styling</strong> as defined
by [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>], Sections 8.4.1.3 and 8.4.1.4, respectively.</div></div>
-<div><div class="numbered constraint" title="R0021">A document <em class="rfc2119" title="must not">must not</em> contain a <code>region</code> element which has a descendant <code>style</code> element.</div></div>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>The constraints in this section result in a document that contains style blocks that are complete and self-contained.</p></div></div>
+<div><div class="numbered constraint" title="R0021">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> contain a <code>region</code> element which has a descendant <code>style</code> element.</div></div>
+<div class="note"><div class="note-title" role="heading" aria-level="4"><span>Note</span></div><div class=""><p>The constraints in this section result in a document that contains style blocks that are complete and self-contained.</p></div></div>
</section>
</section>
<section id="layout_constraints">
@@ -803,22 +796,22 @@
<p></p>
<section id="Constrained_TTML_Feature_layout">
<h3><span class="secno">6.1 </span>Use of Constrained TTML Feature <span>#layout</span></h3>
-<div><div class="numbered constraint" title="R0022">A document <em class="rfc2119" title="must not">must not</em> contain two regions such that the spatial extent of the two regions would (visually) overlap.</div></div>
-<div><div class="numbered constraint" title="R0023">A document <em class="rfc2119" title="must not">must not</em> contain content such that more than four regions would be selected into a given synchronic
+<div><div class="numbered constraint" title="R0022">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> contain two regions such that the spatial extent of the two regions would (visually) overlap.</div></div>
+<div><div class="numbered constraint" title="R0023">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> contain content such that more than four regions would be selected into a given synchronic
intermediate document.</div></div>
-<div><div class="numbered constraint" title="R0024">A document <em class="rfc2119" title="must not">must not</em> contain content such that more than four lines of text would be selected a given synchronic
+<div><div class="numbered constraint" title="R0024">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> contain content such that more than four lines of text would be selected a given synchronic
intermediate document.</div></div>
-<div><div class="numbered constraint" title="R0025">A document <em class="rfc2119" title="must not">must not</em> contain content such that, if the aspect ratio of the root container is 4:3 (16:9),
+<div><div class="numbered constraint" title="R0025">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> contain content such that, if the aspect ratio of the root container is 4:3 (16:9),
then more than 38 (42) characters, respectively, would be present in the same visible line of text.</div></div>
-<div><div class="numbered constraint" title="R0026">A document <em class="rfc2119" title="must not">must not</em> contain content such that, if the aspect ratio of the root container is 4:3 (16:9),
+<div><div class="numbered constraint" title="R0026">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> contain content such that, if the aspect ratio of the root container is 4:3 (16:9),
then more than 152 (168) characters, respectively, would be present in all visible lines of text.</div></div>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>These requirements accommodate content originated in Europe but displayed in the US, as well as content displayed using 16:9 format.</p></div></div>
-<div><div class="numbered constraint" title="R0027">A document <em class="rfc2119" title="must not">must not</em> contain content such that more than one <code>p</code> element would be selected into the
+<div class="note"><div class="note-title" role="heading" aria-level="4"><span>Note</span></div><div class=""><p>These requirements accommodate content originated in Europe but displayed in the US, as well as content displayed using 16:9 format.</p></div></div>
+<div><div class="numbered constraint" title="R0027">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> contain content such that more than one <code>p</code> element would be selected into the
same region in a given synchronic intermediate document.</div></div>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>The style properties of a region and the content selected into the region impact how selected text flows into a region, e.g., selected text may flow outside of the region such as on a mobile device.</p></div></div>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>Constraining a region to select no more than one <code>p</code> element logically places content from two different speakers into different region(s).</p></div></div>
+<div class="note"><div class="note-title" role="heading" aria-level="4"><span>Note</span></div><div class=""><p>The style properties of a region and the content selected into the region impact how selected text flows into a region, e.g., selected text may flow outside of the region such as on a mobile device.</p></div></div>
+<div class="note"><div class="note-title" role="heading" aria-level="4"><span>Note</span></div><div class=""><p>Constraining a region to select no more than one <code>p</code> element logically places content from two different speakers into different region(s).</p></div></div>
<div class="example"><div class="example-title"><span>Example 6</span></div><pre class="example" style="font-family: monospace; font-size: 10pt; color: black; background: white;"><span style="color:blue;"><</span><span style="color:#a31515;">p</span><span style="color:blue;">></span>I always get the fuzzy end<span style="color:blue;"><</span><span style="color:#a31515;">br</span><span style="color:blue;">/></span>of the lollipop.<span style="color:blue;"></</span><span style="color:#a31515;">p</span><span style="color:blue;">></span></pre></div>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>When a document author wants to construct a single phrase for a speaker with more than one line of text in a region, a <code>br</code> element may be used within a <code>p</code> element. See the previous example for one speaker with more than one line.</p></div></div>
+<div class="note"><div class="note-title" role="heading" aria-level="4"><span>Note</span></div><div class=""><p>When a document author wants to construct a single phrase for a speaker with more than one line of text in a region, a <code>br</code> element may be used within a <code>p</code> element. See the previous example for one speaker with more than one line.</p></div></div>
</section>
</section>
<section id="timing_constraints">
@@ -826,49 +819,49 @@
<p></p>
<section id="Constrained_TTML_Feature_timing">
<h3><span class="secno">7.1 </span>Use of Constrained TTML Feature <span>#timing</span></h3>
-<div><div class="numbered constraint" title="R0028">A document <em class="rfc2119" title="must not">must not</em> contain a <strong><timeExpression></strong> value that does not
+<div><div class="numbered constraint" title="R0028">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> contain a <strong><timeExpression></strong> value that does not
conform to the subset of <code>clock-time</code> that matches either of the following patterns: <code>hh:mm:ss.mss</code> or <code>hh:mm:ss:ff</code>,
where <code>hh</code> denotes hours (00-23), <code>mm</code> denotes minutes (00-59), <code>ss</code> denotes seconds (00-59),
<code>mss</code> denotes milliseconds (000-999), and <code>ff</code> denotes frames (00-<em>frameRate - 1</em>).</div></div>
-<div><div class="numbered constraint" title="R0029">A document <em class="rfc2119" title="must">must</em> use the same time expression format throughout the document; more specifically, whichever
-time expression format is encountered first (in lexical order) <em class="rfc2119" title="must">must</em> be used for all subsequent time expressions in the document.</div></div>
+<div><div class="numbered constraint" title="R0029">A document <em class="rfc2119" title="MUST">MUST</em> use the same time expression format throughout the document; more specifically, whichever
+time expression format is encountered first (in lexical order) <em class="rfc2119" title="MUST">MUST</em> be used for all subsequent time expressions in the document.</div></div>
<div><div class="numbered constraint" title="R0030">For time expressions that use the <code>hh:mm:ss.mss</code> format, the following constraints apply:</div></div>
<ul>
-<li>Exactly 2 digits <em class="rfc2119" title="must">must</em> be used in each of the hours, minutes, and second components (include leading zeros).</li>
-<li>Exactly 3 decimal places <em class="rfc2119" title="must">must</em> be used for the milliseconds component (include leading zeros).</li>
+<li>Exactly 2 digits <em class="rfc2119" title="MUST">MUST</em> be used in each of the hours, minutes, and second components (include leading zeros).</li>
+<li>Exactly 3 decimal places <em class="rfc2119" title="MUST">MUST</em> be used for the milliseconds component (include leading zeros).</li>
</ul>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>The phrase <em>milliseconds component</em> above refers to a particular use of the <code>fraction</code> of a <code>clock-time</code> time expression as defined by [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>] Section 10.3.1.</p></div></div>
+<div class="note"><div class="note-title" role="heading" aria-level="4"><span>Note</span></div><div class=""><p>The phrase <em>milliseconds component</em> above refers to a particular use of the <code>fraction</code> of a <code>clock-time</code> time expression as defined by [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>] Section 10.3.1.</p></div></div>
<div class="example"><div class="example-title"><span>Example 7</span></div><pre class="example" style="font-family: monospace; font-size: 10pt; color: black; background: white;"><span style="color:blue;"><</span><span style="color:#a31515;">p</span><span style="color:blue;"> </span><span style="color:red;">begin</span><span style="color:blue;">=</span>'<span style="color:blue;">00:00:01.000</span>'<span style="color:blue;"> </span><span style="color:red;">end</span><span style="color:blue;">=</span>'<span style="color:blue;">00:00:11.123</span>'<span style="color:blue;"> </span><span style="color:red;">region</span><span style="color:blue;">=</span>"<span style="color:blue;">r1</span>"<span style="color:blue;"> ></span>Test<span style="color:blue;"></</span><span style="color:#a31515;">p</span><span style="color:blue;">></span></pre></div>
<div><div class="numbered constraint" title="R0031">For time expressions that use the <code>hh:mm:ss:ff</code> format, the following constraints apply:</div></div>
<ul>
-<li>Exactly 2 digits <em class="rfc2119" title="must">must</em> be used in each of the hours, minutes, second, and frame components (include leading zeros).</li>
-<li>A <code>ttp:frameRate</code> attribute <em class="rfc2119" title="must">must</em> be present on the <code>tt</code> element.</li>
-<li>A <code>ttp:frameRateMultiplier</code> attribute <em class="rfc2119" title="may">may</em> be present on the <code>tt</code> element.</li>
+<li>Exactly 2 digits <em class="rfc2119" title="MUST">MUST</em> be used in each of the hours, minutes, second, and frame components (include leading zeros).</li>
+<li>A <code>ttp:frameRate</code> attribute <em class="rfc2119" title="MUST">MUST</em> be present on the <code>tt</code> element.</li>
+<li>A <code>ttp:frameRateMultiplier</code> attribute <em class="rfc2119" title="MAY">MAY</em> be present on the <code>tt</code> element.</li>
</ul>
<p></p>
<div class="example"><div class="example-title"><span>Example 8</span></div><pre class="example" style="font-family: monospace; font-size: 10pt; color: black; background: white;"><span style="color:blue;"><</span><span style="color:#a31515;">tt</span><span style="color:blue;"> </span><span style="color:red;">p:frameRate</span><span style="color:blue;">=</span>'<span style="color:blue;">30</span>'<span style="color:blue;"> </span><span style="color:red;">p:frameRateMultiplier</span><span style="color:blue;">=</span>'<span style="color:blue;">1000 1001</span>'<span style="color:blue;"></span><span style="color:blue;"> ...></span>
...
<span style="color:blue;"><</span><span style="color:#a31515;">p</span><span style="color:blue;"> </span><span style="color:red;">begin</span><span style="color:blue;">=</span>'<span style="color:blue;">00:00:01:00</span>'<span style="color:blue;"> </span><span style="color:red;">end</span><span style="color:blue;">=</span>'<span style="color:blue;">00:00:11:22</span>'<span style="color:blue;"> </span><span style="color:red;">region</span><span style="color:blue;">=</span>"<span style="color:blue;">r1</span>"<span style="color:blue;"> ></span>Test<span style="color:blue;"></</span><span style="color:#a31515;">p</span><span style="color:blue;">></span></pre></div>
-<div><div class="numbered constraint" title="R0032">A document <em class="rfc2119" title="must not">must not</em> contain an element on which a <code>dur</code> attribute is specified that is not a <code>p</code> or <code>span</code> element.</div></div>
+<div><div class="numbered constraint" title="R0032">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> contain an element on which a <code>dur</code> attribute is specified that is not a <code>p</code> or <code>span</code> element.</div></div>
</section>
<section id="animation">
<h3><span class="secno">7.2 </span>Use of Constrained TTML Feature <span>#animation</span></h3>
-<div><div class="numbered constraint" title="R0033">A document <em class="rfc2119" title="must not">must not</em> contain a <code>set</code> element that is not a child of a <code>region</code> or <code>span</code> element.</div></div>
-<div><div class="numbered constraint" title="R0034">A document <em class="rfc2119" title="must not">must not</em> contain a <code>set</code> child element of a <code>region</code> element that specifies a property to be
+<div><div class="numbered constraint" title="R0033">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> contain a <code>set</code> element that is not a child of a <code>region</code> or <code>span</code> element.</div></div>
+<div><div class="numbered constraint" title="R0034">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> contain a <code>set</code> child element of a <code>region</code> element that specifies a property to be
animated other than: <code>tts:display</code>, <code>tts:origin</code>, or <code>tts:extent</code>.</div></div>
-<div><div class="numbered constraint" title="R0035">A document <em class="rfc2119" title="must not">must not</em> contain a <code>set</code> child element of a <code>span</code> element that specifies a property to be
+<div><div class="numbered constraint" title="R0035">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> contain a <code>set</code> child element of a <code>span</code> element that specifies a property to be
animated other than: <code>tts:color</code>.</div></div>
-<div><div class="numbered constraint" title="R0036">A document <em class="rfc2119" title="must not">must not</em> contain an element that contains more than six (6) <code>set</code> child elements.</div></div>
+<div><div class="numbered constraint" title="R0036">A document <em class="rfc2119" title="MUST NOT">MUST NOT</em> contain an element that contains more than six (6) <code>set</code> child elements.</div></div>
</section>
</section>
<section id="other_constraints">
<!--OddPage--><h2><span class="secno">8. </span>Other Constraints</h2>
<section id="Encoding_Constraints">
<h3><span class="secno">8.1 </span>Encoding Constraints</h3>
-<p>Content Authors <em class="rfc2119" title="must">must</em> adhere to and presentation processors <em class="rfc2119" title="must">must</em> support the following constraints:</p>
-<div><div class="numbered constraint" title="R0037">A document <em class="rfc2119" title="must">must</em> be concretely represented as a well-formed [<cite><a class="bibref" href="#bib-XML10">XML10</a></cite>] entity.</div></div>
-<div><div class="numbered constraint" title="R0038">A document <em class="rfc2119" title="must">must</em> be concretely represented using the UTF-8 character encoding [<cite><a class="bibref" href="#bib-UNICODE">UNICODE</a></cite>].</div></div>
-<div><div class="numbered constraint" title="R0039">A presentation processor <em class="rfc2119" title="must">must</em> reject a document that is not a well-formed [<cite><a class="bibref" href="#bib-XML10">XML10</a></cite>] entity or is not encoded with UTF-8.</div></div>
+<p>Content Authors <em class="rfc2119" title="MUST">MUST</em> adhere to and presentation processors <em class="rfc2119" title="MUST">MUST</em> support the following constraints:</p>
+<div><div class="numbered constraint" title="R0037">A document <em class="rfc2119" title="MUST">MUST</em> be concretely represented as a well-formed [<cite><a class="bibref" href="#bib-XML10">XML10</a></cite>] entity.</div></div>
+<div><div class="numbered constraint" title="R0038">A document <em class="rfc2119" title="MUST">MUST</em> be concretely represented using the UTF-8 character encoding [<cite><a class="bibref" href="#bib-UNICODE">UNICODE</a></cite>].</div></div>
+<div><div class="numbered constraint" title="R0039">A presentation processor <em class="rfc2119" title="MUST">MUST</em> reject a document that is not a well-formed [<cite><a class="bibref" href="#bib-XML10">XML10</a></cite>] entity or is not encoded with UTF-8.</div></div>
</section>
<section id="Ease_of_Use_Constraints">
<h3><span class="secno">8.2 </span>Ease of Use Constraints</h3>
@@ -879,38 +872,38 @@
</ul>
<p>For example, external labeling can be used to identify simplified, reduced, or other language supported content on a text track in HTML5. Such labeling can also be used to identify when large font size is applied to content. Requirements to support user preview and retention of default or user defined settings of selected text are outside of the scope of this profile. These requirements are relevant in the environment to which the captions are deployed.</p>
<section class="Usage_Scenario">
-<p>Presentation processors <em class="rfc2119" title="must">must</em> support the ability of the end user to:</p>
+<p>Presentation processors <em class="rfc2119" title="MUST">MUST</em> support the ability of the end user to:</p>
<div><div class="numbered constraint" title="R0040">Override background color of presented content, with minimum support for at least the
set of (opaque and semi-transparent) color values defined by <a href="#color-values">Color Values</a>.</div></div>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>An end user override of background color is applied to the value of the <code>tts:backgroundColor</code> property
+<div class="note"><div class="note-title" role="heading" aria-level="5"><span>Note</span></div><div class=""><p>An end user override of background color is applied to the value of the <code>tts:backgroundColor</code> property
in the applicable computed style set.</p></div></div>
<div><div class="numbered constraint" title="R0041">Override foreground color of presented text content, with minimum support for at least the
set of (opaque and semi-transparent) color values defined by <a href="#color-values">Color Values</a>.</div></div>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>An end user override of foreground color is applied to the value of the <code>tts:color</code> property
+<div class="note"><div class="note-title" role="heading" aria-level="5"><span>Note</span></div><div class=""><p>An end user override of foreground color is applied to the value of the <code>tts:color</code> property
in the applicable computed style set.</p></div></div>
<div><div class="numbered constraint" title="R0042">Override font family of presented text content, with minimum support for at least the following
generic font family values: <code>default</code>, <code>monospace</code>, <code>monospaceSansSerif</code>, <code>proportionalSerif</code>,
<code>proportionalSansSerif</code>.</div></div>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>An end user override of font family is applied to the value of the <code>tts:fontFamily</code> property
+<div class="note"><div class="note-title" role="heading" aria-level="5"><span>Note</span></div><div class=""><p>An end user override of font family is applied to the value of the <code>tts:fontFamily</code> property
in the applicable computed style set.</p></div></div>
<div><div class="numbered constraint" title="R0043">Override font style of presented text content.</div></div>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>An end user override of font style is applied to the value of the <code>tts:fontStyle</code> property
+<div class="note"><div class="note-title" role="heading" aria-level="5"><span>Note</span></div><div class=""><p>An end user override of font style is applied to the value of the <code>tts:fontStyle</code> property
in the applicable computed style set.</p></div></div>
<div><div class="numbered constraint" title="R0044">Override font size of presented text content.</div></div>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>An end user override of font size is applied to the value of the <code>tts:fontSize</code> property
+<div class="note"><div class="note-title" role="heading" aria-level="5"><span>Note</span></div><div class=""><p>An end user override of font size is applied to the value of the <code>tts:fontSize</code> property
in the applicable computed style set.</p></div></div>
<div><div class="numbered constraint" title="R0045">Override decoration of presented text content, including outline and underline effects.</div></div>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>An end user override of text decoration effects is applied to the value of the <code>tts:textDecoration</code> and/or
+<div class="note"><div class="note-title" role="heading" aria-level="5"><span>Note</span></div><div class=""><p>An end user override of text decoration effects is applied to the value of the <code>tts:textDecoration</code> and/or
<code>tts:textOutline</code> properties in the applicable computed style set.</p></div></div>
-<p>Style overrides <em class="rfc2119" title="must">must</em> be applied to the result of step 2 <strong>[resolve computed styles]</strong> of [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>],
+<p>Style overrides <em class="rfc2119" title="MUST">MUST</em> be applied to the result of step 2 <strong>[resolve computed styles]</strong> of [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>],
Section 8.4.4.4, <em>Style Resolution Process</em>.</p>
<p>Other details of support for end user overrides, including the means by which overrides are presented to and performed
by the end user, are not specified by this profile. Similarly, the sets of choices of values for end user overrides are not specified
by this profile.</p>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>A presentation processor may allow an end user to select override styles that are not explicitly supported
+<div class="note"><div class="note-title" role="heading" aria-level="5"><span>Note</span></div><div class=""><p>A presentation processor may allow an end user to select override styles that are not explicitly supported
by TTML. For example, it may allow for text decoration effects, font styles, and font families to be selected that are not defined
by TTML itself.</p></div></div>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>An implementer of a presentation processor is advised to consult [<cite><a class="bibref" href="#bib-CEA708">CEA708</a></cite>] to obtain additional information
+<div class="note"><div class="note-title" role="heading" aria-level="5"><span>Note</span></div><div class=""><p>An implementer of a presentation processor is advised to consult [<cite><a class="bibref" href="#bib-CEA708">CEA708</a></cite>] to obtain additional information
about override styles.</p></div></div>
</section>
</section>
@@ -940,6 +933,7 @@
<span style="color: blue;"> <</span><span style="color: #a31515;">feature</span><span style="color: blue;"> </span><span style="color: red;">value</span><span style="color: blue;">=</span>"<span style="color: blue;">required</span>"<span style="color: blue;">></span>#layout<span style="color: blue;"></</span><span style="color: #a31515;">feature</span><span style="color: blue;">></span>
<span style="color: blue;"> <</span><span style="color: #a31515;">feature</span><span style="color: blue;"> </span><span style="color: red;">value</span><span style="color: blue;">=</span>"<span style="color: blue;">required</span>"<span style="color: blue;">></span>#length-percentage<span style="color: blue;"></</span><span style="color: #a31515;">feature</span><span style="color: blue;">></span>
<span style="color: blue;"> <</span><span style="color: #a31515;">feature</span><span style="color: blue;"> </span><span style="color: red;">value</span><span style="color: blue;">=</span>"<span style="color: blue;">required</span>"<span style="color: blue;">></span>#length-positive<span style="color: blue;"></</span><span style="color: #a31515;">feature</span><span style="color: blue;">></span>
+<span style="color: blue;"> <</span><span style="color: #a31515;">feature</span><span style="color: blue;"> </span><span style="color: red;">value</span><span style="color: blue;">=</span>"<span style="color: blue;">required</span>"<span style="color: blue;">></span>#length-real<span style="color: blue;"></</span><span style="color: #a31515;">feature</span><span style="color: blue;">></span>
<span style="color: blue;"> <</span><span style="color: #a31515;">feature</span><span style="color: blue;"> </span><span style="color: red;">value</span><span style="color: blue;">=</span>"<span style="color: blue;">required</span>"<span style="color: blue;">></span>#lineBreak-uax14<span style="color: blue;"></</span><span style="color: #a31515;">feature</span><span style="color: blue;">></span>
<span style="color: blue;"> <</span><span style="color: #a31515;">feature</span><span style="color: blue;"> </span><span style="color: red;">value</span><span style="color: blue;">=</span>"<span style="color: blue;">required</span>"<span style="color: blue;">></span>#presentation<span style="color: blue;"></</span><span style="color: #a31515;">feature</span><span style="color: blue;">></span>
<span style="color: blue;"> <</span><span style="color: #a31515;">feature</span><span style="color: blue;"> </span><span style="color: red;">value</span><span style="color: blue;">=</span>"<span style="color: blue;">required</span>"<span style="color: blue;">></span>#profile<span style="color: blue;"></</span><span style="color: #a31515;">feature</span><span style="color: blue;">></span>
@@ -962,11 +956,11 @@
<section id="error_handling">
<!--OddPage--><h2><span class="secno">10. </span>Error handling</h2>
<p>The semantics defined by [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>] Section 6.1.1 apply with regard to the presence of a reference to other standard or non-standard profiles. In particular,
-if an additional, non-standard profile is specified for use by a document and is not dereferencable by the presentation processor, then the document <em class="rfc2119" title="must not">must not</em> be further
+if an additional, non-standard profile is specified for use by a document and is not dereferencable by the presentation processor, then the document <em class="rfc2119" title="MUST NOT">MUST NOT</em> be further
processed without an explicit override from the end user.</p>
-<p>The semantics defined by [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>] Section 6.1.3 apply if some standard or non-standard feature is required, the feature is present in the document, and the presentation processor does not support that feature. In this case also, the document <em class="rfc2119" title="must not">must not</em> be further processed without an explicit override from the end user.</p>
+<p>The semantics defined by [<cite><a class="bibref" href="#bib-TTML10">TTML10</a></cite>] Section 6.1.3 apply if some standard or non-standard feature is required, the feature is present in the document, and the presentation processor does not support that feature. In this case also, the document <em class="rfc2119" title="MUST NOT">MUST NOT</em> be further processed without an explicit override from the end user.</p>
<p>If a feature is present in a document and support for that feature is not required by the profile(s) referenced (or defined) by the document, and if the presentation
-processor does not support or otherwise recognize that feature, then the feature <em class="rfc2119" title="must">must</em> be ignored.</p>
+processor does not support or otherwise recognize that feature, then the feature <em class="rfc2119" title="MUST">MUST</em> be ignored.</p>
</section>
<section class="appendix" id="future_needs">
<!--OddPage--><h2><span class="secno">A. </span>Future Needs for TTML next for Simple Delivery</h2>
@@ -998,6 +992,7 @@
#layout<br>
#length-percentage<br>
#length-positive<br>
+#length-real<br>
#lineBreak-uax14<br>
#textAlign-absolute<br>
#time-offset<br>
@@ -1049,9 +1044,9 @@
</section>
<section class="appendix" id="code-points">
<!--OddPage--><h2><span class="secno">C. </span>Code points</h2>
-<div><div class="numbered constraint" title="R0046">Presentation processors <em class="rfc2119" title="must">must</em> provide font glyph coverage for all characters in the “ISO 8859-1 Latin-1” space and <em class="rfc2119" title="should">should</em> provide coverage for ANSI INCITS 4 when mapped onto Unicode code points (see table below).</div></div>
-<div class="note"><div class="note-title"><span>Note</span></div><p class="">A presentation processor follows the semantics expected for use of Unicode code points as stated in this section. The exact glyph is presentation processor dependent.</p></div>
-<div><div class="numbered constraint" title="R0047">Presentation processors <em class="rfc2119" title="should">should</em> support the C0, G0, C1, and G1 code sets mapped onto Unicode as in the following table. See [[CEA 708]], Section 7.1 including, Table 11.</div></div>
+<div><div class="numbered constraint" title="R0046">Presentation processors <em class="rfc2119" title="MUST">MUST</em> provide font glyph coverage for all characters in the “ISO 8859-1 Latin-1” space and <em class="rfc2119" title="SHOULD">SHOULD</em> provide coverage for ANSI INCITS 4 when mapped onto Unicode code points (see table below).</div></div>
+<div class="note"><div class="note-title" role="heading" aria-level="3"><span>Note</span></div><p class="">A presentation processor follows the semantics expected for use of Unicode code points as stated in this section. The exact glyph is presentation processor dependent.</p></div>
+<div><div class="numbered constraint" title="R0047">Presentation processors <em class="rfc2119" title="SHOULD">SHOULD</em> support the C0, G0, C1, and G1 code sets mapped onto Unicode as in the following table. See [[CEA 708]], Section 7.1 including, Table 11.</div></div>
<table style="border-collapse: collapse;width:630pt; width:835px;border:0">
<colgroup>
<col style="width:38pt; width:51px">
@@ -2064,12 +2059,12 @@
<td class="style2" style="width:49px"></td>
</tr>
</tbody></table>
-<div><div class="numbered constraint" title="R0048">Presentation processors <em class="rfc2119" title="may">may</em> support the extended G2 character sets that map onto Unicode code points (see table above).</div></div>
-<div class="note"><div class="note-title"><span>Note</span></div><div class=""><p>Presentation processors may also provide glyph coverage for additional Unicode code points.</p></div></div>
+<div><div class="numbered constraint" title="R0048">Presentation processors <em class="rfc2119" title="MAY">MAY</em> support the extended G2 character sets that map onto Unicode code points (see table above).</div></div>
+<div class="note"><div class="note-title" role="heading" aria-level="3"><span>Note</span></div><div class=""><p>Presentation processors may also provide glyph coverage for additional Unicode code points.</p></div></div>
</section>
<section class="color_values" id="color-values">
<!--OddPage--><h2><span class="secno">D. </span>Color values</h2>
-<p>For color values of the form <code>#rrggbbaa</code>, presentation processors <em class="rfc2119" title="must">must</em> support combinations where the red, green, and blue components are either <code>00</code> or <code>FF</code>; and the alpha component are <code>00</code>, <code>54</code>, <code>A8</code> or <code>FF</code>, e.g, #00FFFF54. Additionally, presentation processors <em class="rfc2119" title="should">should</em> support values for red, green, and blue of <code>54</code> or <code>A8</code>, and <em class="rfc2119" title="may">may</em> support all possible values between <code>00</code> and <code>FF</code>.</p>
+<p>For color values of the form <code>#rrggbbaa</code>, presentation processors <em class="rfc2119" title="MUST">MUST</em> support combinations where the red, green, and blue components are either <code>00</code> or <code>FF</code>; and the alpha component are <code>00</code>, <code>54</code>, <code>A8</code> or <code>FF</code>, e.g, #00FFFF54. Additionally, presentation processors <em class="rfc2119" title="SHOULD">SHOULD</em> support values for red, green, and blue of <code>54</code> or <code>A8</code>, and <em class="rfc2119" title="MAY">MAY</em> support all possible values between <code>00</code> and <code>FF</code>.</p>
<table>
<tbody><tr>
<th>Color</th>
@@ -2118,8 +2113,8 @@
<section id="references" class="appendix"><!--OddPage--><h2><span class="secno">F. </span>References</h2><section id="normative-references"><h3><span class="secno">F.1 </span>Normative references</h3><dl class="bibliography"><dt id="bib-RFC2119">[RFC2119]</dt><dd>S. Bradner. <a href="http://www.ietf.org/rfc/rfc2119.txt"><cite>Key words for use in RFCs to Indicate Requirement Levels.</cite></a> March 1997. Internet RFC 2119. URL: <a href="http://www.ietf.org/rfc/rfc2119.txt">http://www.ietf.org/rfc/rfc2119.txt</a>
</dd><dt id="bib-TTML10">[TTML10]</dt><dd>G. Adams. <a href="http://www.w3.org/TR/2010/REC-ttaf1-dfxp-20101118/"><cite>Timed Text Markup Language (TTML) 1.0</cite></a>, W3C Recommendation. URL: <a href="http://www.w3.org/TR/2010/REC-ttaf1-dfxp-20101118/">http://www.w3.org/TR/2010/REC-ttaf1-dfxp-20101118/</a>
-</dd><dt id="bib-UNICODE">[UNICODE]</dt><dd>The Unicode Consortium. <a href="http://www.unicode.org/unicode/standard/versions/enumeratedversions.html"><cite>The Unicode Standard.</cite></a> 2003. Defined by: The Unicode Standard, Version 4.0 (Boston, MA, Addison-Wesley, ISBN 0-321-18578-1), as updated from time to time by the publication of new versions URL: <a href="http://www.unicode.org/unicode/standard/versions/enumeratedversions.html">http://www.unicode.org/unicode/standard/versions/enumeratedversions.html</a>
-</dd><dt id="bib-XML10">[XML10]</dt><dd>C. M. Sperberg-McQueen et al. <a href="http://www.w3.org/TR/2008/REC-xml-20081126/"><cite>Extensible Markup Language (XML) 1.0 (Fifth Edition).</cite></a> 26 November 2008. W3C Recommendation. URL: <a href="http://www.w3.org/TR/2008/REC-xml-20081126/">http://www.w3.org/TR/2008/REC-xml-20081126/</a>
+</dd><dt id="bib-UNICODE">[UNICODE]</dt><dd><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-XML10">[XML10]</dt><dd>C. M. Sperberg-McQueen et al. <a href="http://www.w3.org/TR/2008/REC-xml-20081126/"><cite>Extensible Markup Language (XML) 1.0 (Fifth Edition)</cite></a>. 26 November 2008. W3C Recommendation. URL: <a href="http://www.w3.org/TR/2008/REC-xml-20081126/">http://www.w3.org/TR/2008/REC-xml-20081126/</a>
</dd></dl></section><section id="informative-references"><h3><span class="secno">F.2 </span>Informative references</h3><dl class="bibliography"><dt id="bib-CEA608">[CEA608]</dt><dd>CEA-608, <a href="http://www.ce.org/Standards/Standard-Listings/R4-3-Television-Data-Systems-Subcommittee/Line-21-Data-Service.aspx"><cite>Line-21 Data Services</cite></a>, ANSI/CEA Standard. URL: <a href="http://www.ce.org/Standards/Standard-Listings/R4-3-Television-Data-Systems-Subcommittee/Line-21-Data-Service.aspx">http://www.ce.org/Standards/Standard-Listings/R4-3-Television-Data-Systems-Subcommittee/Line-21-Data-Service.aspx</a>
</dd><dt id="bib-CEA708">[CEA708]</dt><dd>CEA-708, <a href="http://www.ce.org/Standards/Standard-Listings/R4-3-Television-Data-Systems-Subcommittee/CEA-708-D.aspx"><cite>Digital Television (DTV) Closed Captioning</cite></a>, ANSI/CEA Standard. URL: <a href="http://www.ce.org/Standards/Standard-Listings/R4-3-Television-Data-Systems-Subcommittee/CEA-708-D.aspx">http://www.ce.org/Standards/Standard-Listings/R4-3-Television-Data-Systems-Subcommittee/CEA-708-D.aspx</a>
</dd><dt id="bib-TTML10SE">[TTML10SE]</dt><dd>G. Adams. <a href="http://dvcs.w3.org/hg/ttml/raw-file/default/ttml10/spec/ttaf1-dfxp.html"><cite>Timed Text Markup Language (TTML) 1.0 (Second Edition)</cite></a>, W3C Editor's Draft. URL: <a href="http://dvcs.w3.org/hg/ttml/raw-file/default/ttml10/spec/ttaf1-dfxp.html">http://dvcs.w3.org/hg/ttml/raw-file/default/ttml10/spec/ttaf1-dfxp.html</a>