Map supplier-orders model with <bag>

gistfile1.xml

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="NHTests" namespace="NHTests">
  <class name="Supplier" table="Suppliers">
    <id name="Id">
      <generator class="guid" />
    </id>
    <property name="Name" length="100" />
    <bag name="Orders" cascade="all-delete-orphan" inverse="true" >
      <key column="SupplierId" />
      <one-to-many class="SupplierOrder" />
    </bag>
  </class>

  <class name="SupplierOrder" table="SupplierOrders" >
    <id name="Id">
      <generator class="guid" />
    </id>
    <many-to-one name="Supplier" class="Supplier" column="SupplierId" />
    <property name="OrderTime" />
  </class>
</hibernate-mapping>