<class name=Foo>
  <many-to-one name=bar class=Bar column=BAR_ID unique=true />
</class>

<class name=Bar>
  <one-to-one name=foo class=Foo property-ref=bar />
  <many-to-one name=baz class=Baz column=BAZ_ID />
</class>

<class name=Baz>
  <set name=bars>
    <key column=BAZ_ID />
    <one-to-many class=Bar />
  </set>

  <set name=foos>
    ????? PROBLEM ?????
  </set>
</class>

      <set name="itemAnnotations" table="ITEM_ANNOTATION">
         <subselect>
            (select r.RELEASE_ID,
               a.ITEM_ANNOTATION_ID, a.ITEM_ID, a.ITEM_ANNOTATION_TITLE,
               a.ISSUE_DESC, a.STATUS_DESC, a.CLOSED_FLAG
            from ITEM_ANNOTATION a
               inner join ITEM i on i.ITEM_ID = a.ITEM_ID
               inner join RELEASE r on r.RELEASE_ID = i.RELEASE_ID)
         </subselect>
         
         <key column="RELEASE_ID"/>

         <composite-element class="ItemAnnotationImpl">
            <many-to-one name="item" class="ItemImpl" column="ITEM_ID" unique="true" not-null="true"/>
            <property name="title" column="ITEM_ANNOTATION_TITLE" not-null="true"/>
            <property name="issueDescription" column="ISSUE_DESC" not-null="true"/>
            <property name="statusDescription" column="STATUS_DESC" not-null="true"/>
            <property name="closed" column="CLOSED_FLAG" not-null="true"/>      
         </composite-element>
      </set>