ExtendedProperty
This class is for creating extended properties
This class should be called with three arguments. The first argument, a string, should be the name of the extended property and it must be an x-name . The second should be an array of the parameters, and the third the value of the property
infoX-names are names that begin with "x-" or "X-" and are reserved for experimental use, not intended for released products, or for use in bilateral agreements.
All the afore documented parameters and values are valid
If you do not wish that the property have any parameters, leave the second argument array empty
new ExtendedProperty("X-CAR", [], new TextType("Volvo"));