ParentChild.hbm.xml

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
				   assembly="NHibernate.Test"
				   namespace="NHibernate.Test.SubselectFetchTest">

	<class name="Child">
		<id name="Name" unsaved-value="any">
			<generator class="assigned" />
		</id>
		<bag name="Friends" fetch="subselect" table="ChildChild">
			<key column="childName1" not-null="true" />
			<many-to-many class="Child" column="childName2"/>
		</bag>
	</class>

	<class name="Parent">
		<id name="Name" unsaved-value="any">
			<generator class="assigned" />
		</id>
		<list name="Children" fetch="subselect" cascade="all">
			<key column="parentName" not-null="true"/>
			<index column="loc"/>
			<one-to-many class="Child"/>
		</list>
		<list name="MoreChildren" table="ParentChild" fetch="subselect">
			<key column="parentName" not-null="true"/>
			<index column="loc"/>
			<many-to-many class="Child" column="childName"/>
		</list>
	</class>

</hibernate-mapping>