Index: source
===================================================================
--- source	(revision 2700)
+++ source	(revision 2701)
@@ -56528,7 +56528,10 @@
   <span>current node</span>. If the newly created element has an <code
   title="">xmlns</code> attribute in the <span>XMLNS namespace</span>
   whose value is not exactly the same as the element's namespace, that
-  is a <span>parse error</span>.</p>
+  is a <span>parse error</span>. Similarly, if the newly created
+  element has an <code title="">xmlns:xlink</code> attribute in the
+  <span>XMLNS namespace</span> whose value is not the <span>XLink
+  Namespace</span>, that is a <span>parse error</span>.</p>
 
   <p>When the steps below require the user agent to <dfn>adjust MathML
   attributes</dfn> for a token, then, if the token has an attribute