order.xml

<?xml version="1.0" encoding="UTF-8"?>
<order>
  <number>123ABC</number>
  <shipping-method>UPS Ground</shipping-method>
  <shipping-price type="float">34.15</shipping-price>
  <status>Processed</status>
  <entries type="array">
    <entry>
      <123123>
        <quantity-requested type="integer">5</quantity-requested>
        <quantity-backordered type="integer">0</quantity-backordered>
        <quantity-processed type="integer">5</quantity-processed>
        <price-each type="float">44.99</price-each>
      </123123>
    </entry>
    <entry>
      <123111>
        <quantity-requested type="integer">5</quantity-requested>
        <quantity-backordered type="integer">2</quantity-backordered>
        <quantity-processed type="integer">3</quantity-processed>
        <price-each type="float">19.99</price-each>
      </123111>
    </entry>
  </entries>
</order>
 => nil 

the keys like 123123 are the SKU