Optional parameters with values
String element = Hello!
Integer element = 123
ComplexType
 String element = Goodbye!
 Integer element = 234
 ComplexType
  String element = Welcome!
  Integer element = 345
Optional parameters with no values in complex type
String element = Hello!
Integer element = 123
ComplexType
 String element = NULL
 Integer element = NULL
 ComplexType = NULL
Optional parameters with no values
String element = NULL
Integer element = NULL
ComplexType = NULL
---------------------- TEST COMPLETE -----------------------------