<?xml version="1.0" encoding="UTF-8"?> 
<ns:root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xs="http://www.w3.org/2001/XMLSchema"
 xsi:schemaLocation="urn:foo invalidQName.xsd"
 xmlns:ns="urn:foo">
   <el_a xsi:type="xs:int">1111</el_a>
   <el_b xsi:type="ns:subInt" >222</el_b>
   <!-- Unknown prefix -->
   <el_c xsi:type="foo:subInt">333</el_c>
   <!-- unknown type -->
   <el_d xsi:type="ns:subIntFoo">444</el_d>
    <!-- unknown -->
    <el_e xsi:type="bla">XyZ</el_e>
</ns:root>