<changelog xmlns="http://www.codesynthesis.com/xmlns/odb/changelog" version="1">
  <changeset version="2">
    <alter-table name="object">
      <add-column name="o1" type="INTEGER" null="true"/>
      <add-foreign-key name="o1_fk" deferrable="DEFERRED">
        <column name="o1"/>
        <references table="object1">
          <column name="id"/>
        </references>
      </add-foreign-key>
    </alter-table>
  </changeset>

  <model version="1">
    <table name="object" kind="object">
      <column name="id" type="INTEGER" null="false"/>
      <primary-key auto="true">
        <column name="id"/>
      </primary-key>
    </table>
    <table name="object1" kind="object">
      <column name="id" type="INTEGER" null="false"/>
      <primary-key>
        <column name="id"/>
      </primary-key>
    </table>
  </model>
</changelog>