How do you Bulk Import Duplicate key-fields using SQLXML

[Jimdeb03]

This was pulled from the SQLXML 3.0 help. I'm using VS2005, SQLExpress and SQLXML 3.0

<ROOT>
  <Order OrderID="11" CustomerID="ALFKI">
    <Product ProductID="11" ProductName="Chai" />
    <Product ProductID="22" ProductName="Chang" />
  </Order>
  <Order OrderID="22" CustomerID="ANATR">
    <Product ProductID="33" ProductName="Aniseed Syrup" />
    <Product ProductID="44" ProductName="Gumbo Mix" />
  </Order>
  <Order OrderID="23" CustomerID="ANATR">
    <Product ProductID="33" ProductName="Aniseed Syrup" />
    <Product ProductID="44" ProductName="Gumbo Mix" />
  </Order>
</ROOT>

You'll see the same CustomerID has multiple ORDERIDs. The same ProductID is used for multiple OrderID's.
I was able to compensate for the duplicate CustomerID's by editing the Order element...
sql:key-fields="OrderID CustomerID"

<xsd:schema xmlns:xsd="[URL unfurl="true"]http://www.w3.org/2001/XMLSchema"[/URL]
            xmlns:sql="urn:schemas-microsoft-com:mapping-schema">
  <xsd:annotation>
    <xsd:appinfo>
      <sql:relationship name="OrderOD"
            parent="Ord"
            parent-key="OrderID"
            child="OrderDetail"
            child-key="OrderID" />

      <sql:relationship name="ODProduct"
            parent="OrderDetail"
            parent-key="ProductID"
            child="Product"
            child-key="ProductID" 
            inverse="true"/>
    </xsd:appinfo>
  </xsd:annotation>

  <xsd:element name="Order" sql:relation="Ord" sql:key-fields="OrderID CustomerID" >
    <xsd:complexType>
      <xsd:sequence>
        <xsd:element name="Product"
                   sql:relation="Product" 
                   sql:key-fields="ProductID ProductName"
                   sql:relationship="OrderOD ODProduct">
          <xsd:complexType>
            <xsd:attribute name="ProductID" type="xsd:int" />
            <xsd:attribute name="ProductName" type="xsd:string" />
          </xsd:complexType>
        </xsd:element>
      </xsd:sequence>
      <xsd:attribute name="OrderID"   type="xsd:integer" />
      <xsd:attribute name="CustomerID"   type="xsd:string" />
    </xsd:complexType>
  </xsd:element>
</xsd:schema>

However, I'm unable to produce the same affect when populating the Product table. Instead I get 'Cannot insert duplicate key in object 'dbo.Product'.

Editing the Product element at sql:key-fields="ProductID ProductName" by adding ProductName doesn't work

How do you edit the schema to allow for duplicate attributes in this situation?
thanks
Jim