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[Music] today im going to talk about a pattern modeling pattern called header detail which you can commonly find in your business model last time i prepared a model about customer and order and today im going to describe this order part more detail when you place an order this kind of order sheet purchase order form you may use it has company name address and purchaser name an address an email and purchase order number and date and here you can find perline quantity description unit price and total price and another uh description quantity and enterprise price and adding all those totals to make this final uh total here you have order and note that one order has several uh items or order lines i would call here is a class named order line or sometimes order detail you will see here quantity unit price and amount subtotal and you will add this amount up to this order to this order to calculate the total in this case in uml total is called derived attribute so the slash means derived a
