有的少 <column-name>。。。</column-name>

<ejb-relationship-role>

<ejb-relationship-role-name>author-stories</ejb-relationship-role-name>

<key-fields>

<key-field>

<!-- Note: Field in Author. -->

<field-name>username</field-name>？？？？

<!-- Note: Column in Story table. -->

<column-name>username</column-name>？？？？

</key-field>

</key-fields>

</ejb-relationship-role>