Hi, it is possible to map bidirectional association usin joined table when the source class is mapped as a joined subclass? The schema dtd3.0 doesn't support element <join> within element <joined-subclass>

Ex:
<joined-subclass name="Proprietor" table="T_PROPRIETOR">
<key column="ID"/>
....
<set name="facilities" table="R_PROPRIETOR_FACILITY" cascade="all,delete-orphan">
<key column="ID_PROPRIETOR"/>
<many-to-many column="ID_FACILITY" class="Facility" unique="true"/>
</set>
</joined-subclass>

<joined-subclass name="Facility" table="T_FACILITY" abstract="true">
<key column="ID"/>
<!-- HERE I NEED USE JOIN element -->
</joined-subclass>
</class>

thanks for any help

The <join> element does not provide an association. It is closer to a view. You cannot use join within joined-subclass, but you can use many-to-one assocuations and collection elements (map, set, list, array, bag, etc.), and those are what you need to make bidirectional associations.

Read chapters 6 and 7 of the ref docs. Note the lack of the <join> tag in those two chapters.