<many-to-many target-entity="Video" field="videos">
    <join-table name="video_tag">
        <join-columns>
            <join-column name="tag_id"/>
        </join-columns>
        <inverse-join-columns>
            <join-column name="video_id"/>
        </inverse-join-columns>
    </join-table>
</many-to-many>