8036951: Xerces Update: XMLSchemaValidator.java and XMLSchemaLoader.java
Reviewed-by: lancea
<?xml version="1.0"?>
<itemList>
<item uniqueAttr="ONE">1</item>
<item uniqueAttr="ONE">2</item>
<item uniqueAttr="TWO">2</item>
<itemRef>3</itemRef>
</itemList>