--- a/ttml10-sdp-us/Overview.html	Thu Sep 20 18:04:15 2012 +0800
+++ b/ttml10-sdp-us/Overview.html	Fri Sep 21 02:23:15 2012 +0800
@@ -694,6 +694,10 @@
 <li>Roll-up</li>
 <li>Paint-on</li>
 </ul>
+<p>Note: Pop-up style captions are typically characterized by small blocks of text that appear all at once.</p>
+<p>Note: Roll-up style captions are typically characterized by words (or small groups of letters) appearing sequentially,
+so that a line fills up incrementally, and then as new lines are added the upper lines are scrolled out of view.</p>
+<p>Note: A Paint-on caption typically appears on the screen one character at a time and is displayed like a Pop-up caption.</p>
 <p>Examples are provided of each style to aid in understanding the common forms.</p>
 <section>
 <p data-transform='example'>Pop-up style</p>
@@ -710,13 +714,13 @@
 "color: blue;">=</span>'<span style="color: blue;">20% 58%</span>'<span style="color: blue;"> </span><span style="color: red;">s:extent</span><span style="color: blue;">=</span>'<span style="color: blue;">60% 18%</span>'<span style="color: blue;">/&gt;</span>
 <span style="color: blue;">    &lt;/</span><span style="color: #a31515;">styling</span><span style="color: blue;">&gt;</span>
 <span style="color: blue;">    &lt;</span><span style="color: #a31515;">layout</span><span style="color: blue;">&gt;</span>
-<span style="color: blue;">      &lt;!--</span><span style="color: green;"> typical 'pop on' type region </span><span style="color: blue;">--&gt;</span>
+<span style="color: blue;">      &lt;!--</span><span style="color: green;"> typical 'Pop-up' type region </span><span style="color: blue;">--&gt;</span>
 <span style="color: blue;">      &lt;</span><span style="color: #a31515;">region</span><span style="color: blue;"> </span><span style="color: red;">xml:id</span><span style="color: blue;">=</span>"<span style="color: blue;">bottomMid</span>"<span style="color: blue;"> </span><span style="color: red;">style</span><span style="color: blue;">=</span>"<span style="color: blue;">bottomMidStyle</span>"<span style="color: blue;"> /&gt;</span>
 <span style="color: blue;">    &lt;/</span><span style="color: #a31515;">layout</span><span style="color: blue;">&gt;</span>
 <span style="color: blue;">  &lt;/</span><span style="color: #a31515;">head</span><span style="color: blue;">&gt;</span>
 <span style="color: blue;">  &lt;</span><span style="color: #a31515;">body</span><span style="color: blue;">&gt;</span>
 <span style="color: blue;">    &lt;</span><span style="color: #a31515;">div</span><span style="color: blue;"> </span><span style="color: red;">style</span><span style="color: blue;">=</span>"<span style="color: blue;">defaultFont</span>"<span style="color: blue;">&gt;</span>
-<span style="color: blue;">      &lt;</span><span style="color: #a31515;">p</span><span style="color: blue;"> </span><span style="color: red;">region</span><span style="color: blue;">=</span>"<span style="color: blue;">bottomMid</span>"<span style="color: blue;"> </span><span style="color: red;">begin</span><span style="color: blue;">=</span>'<span style="color: blue;">00:00:00.101</span>'<span style="color: blue;"> </span><span style="color: red;">end</span><span style="color: blue;">=</span>'<span style="color: blue;">00:00:03.000</span>'<span style="color: blue;">&gt;</span> This is a pop on caption. <span style="color: blue;">&lt;/</span><span style="color: #a31515;">p</span><span style="color: blue;">&gt;</span>
+<span style="color: blue;">      &lt;</span><span style="color: #a31515;">p</span><span style="color: blue;"> </span><span style="color: red;">region</span><span style="color: blue;">=</span>"<span style="color: blue;">bottomMid</span>"<span style="color: blue;"> </span><span style="color: red;">begin</span><span style="color: blue;">=</span>'<span style="color: blue;">00:00:00.101</span>'<span style="color: blue;"> </span><span style="color: red;">end</span><span style="color: blue;">=</span>'<span style="color: blue;">00:00:03.000</span>'<span style="color: blue;">&gt;</span> This is a Pop-up caption. <span style="color: blue;">&lt;/</span><span style="color: #a31515;">p</span><span style="color: blue;">&gt;</span>
 <span style="color: blue;">    &lt;/</span><span style="color: #a31515;">div</span><span style="color: blue;">&gt;</span>
 <span style="color: blue;">  &lt;/</span><span style="color: #a31515;">body</span><span style="color: blue;">&gt;</span>
 <span style="color: blue;">&lt;/</span><span style="color: #a31515;">tt</span><span style="color: blue;">&gt;</span>
@@ -785,7 +789,7 @@
 <span style="color: blue;">&lt;/</span><span style="color: #a31515;">tt</span><span style="color: blue;">&gt;</span>
 </pre></section>
 <section>
-<p data-transform='example'>Rollup and Paint on style. Content is presented a word at a time and lines scroll up in a small fixed window (typically 3 or 4 lines). The paint-on text is often embodied in roll-up content.</p>
+<p data-transform='example'>Roll-up and Paint-on style. Content is presented a word at a time and lines scroll up in a small fixed window (typically 3 or 4 lines). The Paint-on text is often embodied in Roll-up content.</p>
 <!-- div data-include=example4.xml'></div -->
 <pre class='example' style="font-family: Segoe UI; font-size: 13pt; color: black; background: white;">
 <span style="color: blue;">&lt;</span><span style="color: #a31515;">p</span><span style="color: blue;"> </span><span style="color: red;">region</span><span style="color: blue;">=</span>'<span style="color: blue;">rollup</span>'<span style="color: blue;"> </span><span style="color: red;">begin</span><span style="color: blue;">=</span>'<span style="color: blue;">00:00:13.000</span>'<span style="color: blue;"> </span><span style="color: red;">dur</span><span style="color: blue;">=</span>'<span style="color: blue;">00:00:11.000</span>'<span style="color: blue;">&gt;</span>
@@ -814,7 +818,7 @@
 <span style="color: blue;">  &lt;</span><span style="color: #a31515;">span</span><span style="color: blue;"> </span><span style="color: red;">begin</span><span style="color: blue;">=</span>'<span style="color: blue;">00:00:03.000</span>'<span style="color: blue;">&gt;</span>day<span style="color: blue;">&lt;/</span><span style="color: #a31515;">span</span><span style="color: blue;">&gt;</span>
 <span style="color: blue;">&lt;/</span><span style="color: #a31515;">p</span><span style="color: blue;">&gt;</span>
 </pre>
-<p>Note: As shown in the rollup example, a function of time for a k line rollup of content: The begin time of the N+kth p element is equal to the begin time plus duration of the Nth p element less the begin time of the first span in the N+kth p.</p>
+<p>Note: As shown in the Roll-up example, a function of time for a k line Roll-up of content: The begin time of the N+kth p element is equal to the begin time plus duration of the Nth p element less the begin time of the first span in the N+kth p.</p>
 </section>
 </section>
 </section>
@@ -1341,8 +1345,7 @@
 <p>Processors MUST support the capability to present documents where the following constraints apply:</p>
 <p data-transform='constraint'>Timing MUST be expressed in the hh:mm:ss.ms or hh:mm:ss:ff format used in the timeExpression.</p>
 <p data-transform='constraint'>Timing MUST be expressed in the same format throughout the document.</p>
-<p data-transform='constraint'>Durations (dur) SHALL only be used on the span element for rollup style content.</p>
-<p>Note: The use of dur on a span supports rollup style content. For content other than rollup, the default behavior is to remain present until the end of the container. Therefore, durations are not needed on the span element.</p>
+<p data-transform='constraint'>Durations (dur) SHALL only be used on the span element for Roll-up style content.</p>
 <p data-transform='constraint'>For timing in hh:mm:ss.ms, the following format MUST be used:</p>
 <ul>
 <li>Exactly 2 digits MUST be used in each of the hours, minutes, and second components (include leading zeros).</li>