tests/src/XSTSHarness/regression/XERCESC-1237/test.xml

<?xml version="1.0"?>
<root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:noNamespaceSchemaLocation="unique.xsd">

  <child attr="1">1</child>
  <child attr="2">2</child>
  <child>4</child>

</root>