<?xml version="1.0" encoding="ASCII"?>
<x:x
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:x="http://www.example.com/X" 
    xmlns:y="http://www.example.com/Y"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xsi:type="y:Y"
    xsi:schemaLocation="http://www.example.com/X x.xsd http://www.example.com/Y y.xsd">
</x:x>