This is invoice.xml which uses invoiceschema.xsd:

<?xml version="1.0" encoding="UTF-8"?>
<invoice:invoice xmlns:invoice="http://www.skatestown.com/ns/invoice"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://www.skatestown.com/ns/invoice
                       d:\temp\invoiceschema.xsd"
   id="43871" submitted="2004-01-05" customerId="73852">
   <billTo id="addr-1">
      <company>The Skateboard Warehouse</company>
      <street>One Warehouse Park</street>
      <street>Building 17</street>
      <city>Boston</city>
      <state>MA</state>
      <postalCode>01775</postalCode>
   </billTo>
   <shipTo href="addr-1"/>
   <order>
      <item sku="318-BP" quantity="5" unitPrice="49.95">
         <description>Skateboard backpack; five pockets</description>
      </item>
      <item sku="947-TI" quantity="12" unitPrice="129.00">
         <description>Street-style titanium skateboard.</description>
      </item>
      <item sku="008-PR" quantity="1000" unitPrice="0.00">
         <description>Promotional: SkatesTown stickers</description>
      </item>
   </order>
   <tax>89.89</tax>
   <shippingAndHandling>200</shippingAndHandling>
   <totalCost>2087.64</totalCost>
</invoice:invoice>