--- a/ttml1/spec/ttml1-errata.html	Wed Jul 30 21:31:18 2014 -0600
+++ b/ttml1/spec/ttml1-errata.html	Wed Jul 30 22:10:32 2014 -0600
@@ -54,8 +54,10 @@
     <h2>Conventions</h2>
     <p>Added text marked <span class="diff-add">thus</span>. Removed text
       marked <span class="diff-del">thus</span>. Changed text marked <span class="diff-chg">thus</span>.</p>
-    <h2 id="errors">Known errata as of 17 July 2014</h2>
+    <h2 id="errors">Known errata as of 31 July 2014</h2>
     <ul>
+      <li><a href="#errata-2.3-1">Correction in TTML1 Section 2.3 Document Conventions</a>
+          (published 2014-07-31)</li>
       <li><a href="#errata-5.2-1">Correction in TTML1 Section 5.2 Profiles</a>
           (published 2014-01-30)</li>
       <li><a href="#errata-8.2.7-1">Correction in TTML1 Section 8.2.7 tts:extent attribute</a>
@@ -71,6 +73,15 @@
     </ul>
     <h2>Errata</h2>
     <hr />
+    <p id="errata-2.3-1">Correction
+        in <a href="http://www.w3.org/TR/2013/REC-ttml1-20130924/#conventions">TTML1 Section 2.3 Document Conventions</a> (published 2014-07-31) </p>
+    <p class="description"><span class="title-description">Description</span>:</p>
+    Clarify meaning of expression <em>{any attribute not in default or any TT namespace}</em>.
+    <p class="description"><em><strong><span class="title-correction">Resolution</span></strong></em>:</p>
+    <p>Add following paragraph after the first paragraph (starting with "In an XML representation, ...") that follows the
+    <strong>XML Representation &#x2014; Element Information Item: example</strong>:</p>
+    <p class="diff-add">In an XML representation, the expression <em>{any attribute not in default or any TT namespace}</em> applies only to namespace qualified attributes; unqualified attributes are not permitted unless explicitly defined in this specification.</p>
+    <hr />
     <p id="errata-5.2-1">Correction
         in <a href="http://www.w3.org/TR/2013/REC-ttml1-20130924/#vocabulary-profiles">TTML1 Section 5.2 Profiles</a> (published 2014-01-30) </p>
     <p class="description"><span class="title-description">Description</span>:</p>

--- a/ttml2/spec/ttml2-changes.html	Wed Jul 30 21:31:18 2014 -0600
+++ b/ttml2/spec/ttml2-changes.html	Wed Jul 30 22:10:32 2014 -0600
@@ -256,6 +256,9 @@
 * In 2.2, refine definition of "out-of-line region" to better account for
   default region implication.
 
+* In 2.3, add text clarifying meaning of expression '{any attribute not in
+  default or any TT namespace}'.
+
 * In 2.3, add convention for deprecated syntactic features (using distinct
   background color).
 

--- a/ttml2/spec/ttml2.xml	Wed Jul 30 21:31:18 2014 -0600
+++ b/ttml2/spec/ttml2.xml	Wed Jul 30 22:10:32 2014 -0600
@@ -1076,6 +1076,8 @@
 <loc href="#terms-attribute-information-item">attribute information item</loc> has a built-in simple type definition
 defined in <bibref ref="xsd-2"/>, a hyperlink to its definition
 therein is given.</p>
+<p>In an XML representation, the expression <emph>{any attribute not in default or any TT namespace}</emph> applies
+only to namespace qualified attributes; unqualified attributes are not permitted unless explicitly defined in this specification.</p>
 <p>An information item depicted with a <phrase role="deprecated">light yellow orange</phrase> background color is deprecated (e.g.,
 the <phrase role="deprecated">tiny</phrase> value of the <code>size</code> attribute shown above).
 An information item that is <phrase role="deprecated">deprecated</phrase> may but should not appear in a TTML document instance,