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[...]
  <OrderItems>
    <OrderItem>
      <ItemName>Playstation 4</ItemName>
      <Description>Beste Konsole zur Zeit auf dem Markt.</Description>
      <UnitPrice>499</UnitPrice>
      <Quantity>1</Quantity>
    </OrderItem>
    <OrderItem>
      <ItemName>PS4 Controller</ItemName>
      <Description>Echt ergonometrisch.</Description>
      <UnitPrice>59</UnitPrice>
      <Quantity>2</Quantity>
    </OrderItem>
  </OrderItems>
[...]					

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[...]
<Items>
<Item ItemName="PS4" Description="Beste Konsole zur Zeit auf dem Markt." UnitPrice="499" Quantity="1">
<Item ItemName="PS4 Controller" Description="Echt ergonometrisch." UnitPrice="59" Quantity="2">
</Items>
[...]					

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public class PurchaseOrder
        {
            public Address ShipTo;

            [XmlAttribute] //so wandert das XML-Element "OrderDate" als XML-Attribute in die Titelzeile
            public String OrderDate; 

            public OrderItem[] OrderItems = new OrderItem[2]; //hier nur zum Testen 2 OrderItems im Array
            public decimal ShipCost;