ABCProxy.hbm.xml

<?xml version="1.0" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
	assembly="NHibernate.DomainModel"
	namespace="NHibernate.DomainModel"
	default-lazy="false">

	<class name="A" lazy="true" discriminator-value="0">
		<id name="Id" unsaved-value="0" type="Int64">
			<generator class="native" />
		</id>
		<discriminator column="clazz_discriminata" type="Int32" force="true" not-null="false" />
		<property name="Name" />
		<many-to-one name="Forward" column="`Forward`" class="E" cascade="save-update" />

		<subclass name="B" lazy="true" discriminator-value="null">
			<property name="Count" column="count_" type="Int32" />
			<map name="Map">
				<key column="BID" />
				<index column="MAPKEY" type="String" />
				<element column="MAPVAL" type="Int32" />
			</map>
			
			<subclass name="C1" discriminator-value="1" lazy="true">
				<property name="Address" column="c1" />
				<one-to-one name="D" class="D" />
				<many-to-one name="C2" column="c" class="C2" />
				<bag name="C2s" inverse="true" where="clazz_discriminata=2">
					<key column="c"/>
					<one-to-many class="C2" />
				</bag>
			</subclass>
			
			<subclass name="C2" lazy="true" discriminator-value="2">
				<property name="Address" column="c2" />
				<many-to-one name="C1" column="c" class="C1" />
				<bag name="C1s" inverse="true" where="clazz_discriminata=1" lazy="true">
					<key column="c"/>
					<one-to-many class="C1" />
				</bag>
			</subclass>
		</subclass>
	</class>

	<class name="D" discriminator-value="0" lazy="true">
		<id name="Id" unsaved-value="0" type="Int64">
			<generator class="assigned" />
		</id>
		<property name="Amount" type="Double" />
	</class>

	<class name="E" discriminator-value="0" lazy="true">
		<id name="Id" unsaved-value="0" type="Int64">
			<generator class="native" /> <!-- Hibernate 2.1 has class="increment" here -->
		</id>
		<property name="Amount" type="Double" />
		<one-to-one name="Reverse" class="A" property-ref="Forward" cascade="save-update" />
	</class>

</hibernate-mapping>