Are you looking for all the variables, or just the classes? The classes would be CustomerInfo, OrderNumber, and ItemNumber
I have to run out right now, but will be back in about an hour with an answer.
CustomerInfo(Ident, Name, Address, City, State, Zip, Tax) [Tax being whether the customer is tax-free or not]
OrderNumber(OIdent, Item1, Quantity1, Price1, Item2, Quantity2 .......) [Continue for as many items are in one order]