From 3179903aff1dcc914a0959c9d4acfeea7b33ffc8 Mon Sep 17 00:00:00 2001
From: Pierre-Anthony Lemieux <pal@palemieux.com>
Date: Thu, 4 Jul 2019 11:27:36 -0700
Subject: [PATCH] Clarify #extent-region constraints (#469)

---
 imsc1/spec/ttml-ww-profiles.html | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/imsc1/spec/ttml-ww-profiles.html b/imsc1/spec/ttml-ww-profiles.html
index b22be981..8f70fa24 100644
--- a/imsc1/spec/ttml-ww-profiles.html
+++ b/imsc1/spec/ttml-ww-profiles.html
@@ -3144,8 +3144,11 @@ <h4><code>#color</code></h4>
       <section id="text-extent-region">
         <h4><code>#extent-region</code></h4>
 
-        <p>The <code>tts:extent</code> attribute SHALL be present on all <code>region</code> elements, where it SHALL use
-        <code>px</code> units, percentage values, or root container relative units.</p>
+        <p>The <code>tts:extent</code> style property SHALL be specified on all the <code>region</code> elements of a
+				<a>Document Instance</a>.</p>
+				
+				<p>The value of a <code>tts:extent</code> style property specified on a <code>region</code> element SHALL
+				use <code>px</code> units, percentage values, or root container relative units.</p>
       </section>
 
       <section id="text-fontFamily-generic">
@@ -3378,8 +3381,11 @@ <h4><code>#content</code></h4>
       <section id="image-extent-region">
         <h4><code>#extent-region</code></h4>
 
-        <p>The <code>tts:extent</code> attribute SHALL be present on all <code>region</code> elements, where it SHALL use
-        <code>px</code> units.</p>
+        <p>The <code>tts:extent</code> style property SHALL be specified on all the <code>region</code> elements of a
+				<a>Document Instance</a>.</p>
+				
+				<p>The value of a <code>tts:extent</code> style property specified on a <code>region</code> element SHALL
+				use <code>px</code> units.</p>
       </section>
 
       <section id="image-length-negative">