Written by Michael Dale for DCA Assignment 1 Part 2 - 10309108 - Copyright 2005

This schema contains two main sections. The first part is the simpleType setup where I define
values that require checking (and aren't just strings).

orderNumberType: Any 6 digit number.
yearType: Any integer between (and including) 2000 - 3000.
monthType: Any integer between (and including) 1 - 12.
dayType: Any integer between (and including) 1 - 31.
currencyType: A string of one of the following values: AUD, USD, EUR, JPY.
quantityType: Any integer between (and including) 1 - 1000.
unitcostType: A double that is between (and including) 0.00 - 99999.00 and also in that format.

The next section is where the elements and structure of the XML document is defind.