Add #originalLang-root extension and require it

index.html

@@ -601,7 +601,7 @@ <h4>Original Language</h4>
           </p>
           <p>The <a>Original Language</a> is represented in a <a>DAPT Document</a> by the following structure and constraints:
             <ul>
-              <li>the <code>daptm:originalLang</code> attribute MUST be present on the <code>&lt;tt&gt;</code> element
+              <li>the <dfn><code>daptm:originalLang</code></dfn> attribute MUST be present on the <code>&lt;tt&gt;</code> element
                 and its value MUST NOT be empty.</li>
               <li>the value of the attribute MUST be a language identifier as defined by [[BCP47]].</li>
             </ul>
@@ -2431,6 +2431,14 @@ <h4>Disposition of Features and Extensions</h4>
               This is the profile expression of <a href="#on-screen"></a>.
             </td>
           </tr>
+
+          <tr>
+            <td><a href="#originallang-root"><code>#originallLang-root</code></a></td>
+            <td><span class="required label">required</span></td>
+            <td>
+              This is the profile expression of <a href="#original-language"></a>.
+            </td>
+          </tr>
           <tr>
             <td><a href="#profile-root"><code>#profile-root</code></a></td>
             <td><span class="prohibited label">prohibited</span></td>
@@ -2591,6 +2599,17 @@ <h3>#onScreen</h3>
           <a><code>daptm:onScreen</code></a> attribute on the <code>&lt;div&gt;</code> element.</p>
       </section>
 
+      <section>
+        <h3>#originalLang-root</h3>
+        <p>A <a>transformation processor</a> supports the <code>#originalLang-root</code> extension if
+          it recognizes and is capable of transforming values of the
+          <a><code>daptm:originalLang</code></a> attribute on the <code>&lt;tt&gt;</code> element.</p>
+
+        <p>A <a>presentation processor</a> supports the <code>#originalLang-root</code> extension if
+          it implements presentation semantic support of the
+          <a><code>daptm:originalLang</code></a> attribute on the <code>&lt;tt&gt;</code> element.</p>
+      </section>
+
       <section>
         <h3>#profile-root</h3>
         <p>A <a>transformation processor</a> supports the <code>#profile-root</code> extension if

profiles/dapt-content-profile.xml

@@ -83,6 +83,7 @@
   <extensions xml:base="http://www.w3.org/ns/ttml/profile/dapt/extension/">
     <!-- required (mandatory) extension support -->
     <extension value="required">#contentProfiles-root</extension>
+    <extension value="required">#originallLang-root</extension>
     <extension value="required">#scriptType-root</extension>
     <extension value="required">#serialization</extension>
     <extension value="required">#textLanguageSource</extension>

profiles/dapt-processor-profile.xml

@@ -85,6 +85,7 @@
     <extension value="required">#agent</extension>
     <extension value="required">#contentProfiles-root</extension>
     <extension value="required">#onScreen</extension>
+    <extension value="required">#originallLang-root</extension>
     <extension value="required">#scriptType-root</extension>
     <extension value="required">#serialization</extension>
     <extension value="required">#textLanguageSource</extension>