xml/tests/testData/xml/Substitute/test.xml

<root xmlns="http://test/a" 
      xmlns:b="http://test/b"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://test/b schema-b.xsd">

    <instance/>
    <b:instance id=""/>
</root>