1<x xmlns:xinclude="http://www.w3.org/2001/XInclude"> 2 <!-- Simple test of a fallback on unavailble URI --> 3 <xinclude:include href="something.xml"> 4 <xinclude:fallback><warning>Inclusion failed</warning></xinclude:fallback> 5 </xinclude:include> 6</x> 7