1<a>
2        <xi:include href="b.xml" xmlns:xi="http://www.w3.org/2001/XInclude">
3                <xi:fallback>There is no b.xml ... </xi:fallback>
4        </xi:include>
5        <xi:include href="c.xml" xmlns:xi="http://www.w3.org/2001/XInclude">
6                <xi:fallback>There is no c.xml ... </xi:fallback>
7        </xi:include>
8
9</a>
10
11