primary
{
  namespace test
  {
    complex type
    {
      element foo2
      element bar2
      element foo3
      element bar3
      [1, 1] sequence
      {
        [0, unbounded] choice
        {
          [0, 1] choice
          {
            [1, 1] element foo2 http://www.w3.org/2001/XMLSchema#string
            [0, 1] element bar2 http://www.w3.org/2001/XMLSchema#string
          }
          [1, unbounded] choice
          {
            [1, unbounded] element foo3 http://www.w3.org/2001/XMLSchema#string
            [0, unbounded] element bar3 http://www.w3.org/2001/XMLSchema#string
          }
        }
      }
    }
    element foo2 http://www.w3.org/2001/XMLSchema#string
    element bar2 http://www.w3.org/2001/XMLSchema#string
    element foo3 http://www.w3.org/2001/XMLSchema#string
    element bar3 http://www.w3.org/2001/XMLSchema#string
  }
}