--- a/ttml10/spec/ttaf1-dfxp.xml	Thu Jan 31 09:54:13 2013 -0700
+++ b/ttml10/spec/ttaf1-dfxp.xml	Wed Feb 06 12:03:00 2013 -0700
@@ -8803,8 +8803,9 @@
 <gitem>
 <label>charset</label>
 <def>
-<p>Same as application/xml media type, as specified in <bibref
-ref="rfc3023"/> or its successors.</p>
+<p>If specified, must be <code>utf-8</code> or <code>utf-16</code>; otherwise, if not specified or
+if the specified value is inconsistent with the value of the <code>encoding</code> parameter of the XML Declaration
+(if present), then the semantics of <bibref ref="rfc3023"/> &sect;3.2 apply.</p>
 </def>
 </gitem>
 <gitem>