--- a/ttml10/spec/ttaf1-dfxp.xml	Thu Jul 19 00:38:48 2012 -0600
+++ b/ttml10/spec/ttaf1-dfxp.xml	Thu Jul 19 01:10:10 2012 -0600
@@ -5969,7 +5969,7 @@
 3.2.4.1. If the value represented is less than 0.0,
 then it must be interpreted as equal to 0.0; similarly, if the value
 represented is greater than 1.0, then it must be interpreted as
-1.0. The value NaN shall be interpreted as 0.0.</p>
+1.0. The value NaN must be interpreted as 0.0.</p>
 <p>If a presentation processor does not support a specific,
 valid opacity value, then it must interpret it as being equal to the
 closest supported value.</p>
@@ -7282,13 +7282,13 @@
 <emph>DOC<sub><phrase>inter<sub>0</sub></phrase></sub></emph> &hellip;
 <emph>DOC<sub><phrase>inter<sub>N&minus;1</sub></phrase></sub></emph>.</p>
 <note role="elaboration">
-Where an implementation is able to detect significant similarity between two
+<p>Where an implementation is able to detect significant similarity between two
 adjacent synchronic document instances,
 <emph>DOC<sub><phrase>inter<sub>0</sub></phrase></sub></emph> &hellip;
 <emph>DOC<sub><phrase>inter<sub>N&minus;1</sub></phrase></sub></emph>,
 then it is preferred that the implementation make the transition between
 presenting the two instances as smooth as possible, e.g., as described
-by <bibref ref="cea608c">, &sect; C.3.
+by <bibref ref="cea608c"/>, &sect; C.3.</p>
 </note>
 </div3>
 <div3 id="semantics-region-layout-step-2">
@@ -7667,7 +7667,14 @@
 then the temporal intervals of child elements are considered to apply in
 parallel, i.e., simultaneously in time. Furthermore, the specification of
 the time interval of each child element is considered to be relative to the temporal
-interval of the container element instance.</p>
+interval of the container element instance. For the purpose of determining the
+<bibref ref="smil21"/> <code>endsync</code> semantics of a <code>par</code>
+time container, a default value of <code>all</code> applies.</p>
+<note role="elaboration">
+<p>The use of a default value of <code>all</code> for the <code>endsync</code>
+behavior is distinct from <bibref ref="smil21"/> which uses a default value
+of <code>last</code>.</p>
+</note>
 <p>If the time container semantics of an element instance is <code>seq</code>,
 then the temporal intervals of child elements are considered to apply in
 sequence, i.e., sequentially in time. Furthermore, the specification of