<hibernate-mapping package="com.example">
  <class name="FeedCategory">
    <id name="id">
    <property name="createdDate" column="CREATED_DATE" type="date">
    [...]       
    <bag name="subCategories" inverse="true" lazy="false">
      <key column="PARENT_ID">
      <one-to-many name="com.example.FeedCategory">
    </bag>
  </class>
</hibernate-mapping>