...
<map name="descriptions" table="DESCRIPTION" cascade="all-delete-orphan">
    <key column="EXPORT_ID"/>
    <index column="LANGUAGE_ID" type="Language"/>
    <one-to-many class="Description"/>
</map>...

<class name="Description" table="DESCRIPTION">

    <id name="id" type="long" unsaved-value="-1">
        <column name="ID" not-null="true"/>
        <generator class="native"/>
    </id>

    <property name="description" type="string">
        <column name="DESCR" not-null="true" length="2000"/>
    </property>

    <many-to-one name="Language" class="Language" column="LANGUAGE_ID" cascade="save-update"/>

</class>