Typo in C.5 Fallback Example

Hello!

C.5 Fallback Example section's example [1] is ill-formed:
"xi" namespace prefix is not bound:

<?xml version='1.0'?>
<div>
   <xi:include href="example.txt" parse="text">
     <xi:fallback>
       <xi:include href="fallback-example.txt" parse="text">
         <xi:fallback><a href="mailto:bob@example.org">Report 
error</a></xi:fallback>
       </xi:include>
     </xi:fallback>
   </xi:include>
</div>

[1] http://www.w3.org/TR/xinclude/#fallback-example
-- 
Oleg Tkachenko
http://www.tkachenko.com/blog
Multiconn Technologies, Israel