/////////////////////////////////////////////////////////////////
PolyXMLArray tests
/////////////////////////////////////////////////////////////////
Array content before streaming out: 4 classes:
  class #0 is a 'Base'
    BaseData    = 'Sample data in base class'
  class #1 is a 'Derived'
    BaseData    = 'Sample data in derived class'
    DerivedData = 'Another sample data in derived class'
  class #2 is a 'Another'
    BaseData    = 'Sample data in Derived class'
    DerivedData = 'Another sample data in Derived class'
    AnotherData = '12345'
  class #3 is a 'OneMore'
    BaseData    = 'Sample data in OneMore class'
    DerivedData = 'Another sample data in OneMore class'
    AnotherData = '12'
    OneMoreData = '3.1418'

Streamed XML :

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<!DOCTYPE PolyXMLTest>
<PolyXMLTest>
        <Base>
                <BaseData>Sample data in base class</BaseData>
        </Base>
        <Derived>
                <BaseData>Sample data in derived class</BaseData>
        </Derived>
        <Another>
                <BaseData>Sample data in Derived class</BaseData>
        </Another>
        <OneMore>
                <BaseData>Sample data in OneMore class</BaseData>
        </OneMore>
</PolyXMLTest>