Use an element mapped as <any> in HQL

Hibernate version: 3.1
Name and version of the database you are using: Oracle 10g

Mapping documents:
<class name="AuditRequest" ...>
...
<any name="targetEntity" id-type="long" meta-type="string" >
<meta-value value="A" class="Area" </>
<meta-value value="R" class="Role" </>
<column name="ENTITY_TYPE" />
<column name="ENTITY_ID" />
</any>
</class>

HQL request:


I would like to pass 'Area' or 'Role' value for the entityClass named parameter.
But, rows are returned when the meta-value is set for entityClass . ('A' or 'R' in the example.
How could I use the class name in the HQL ?

Note : I use here the syntax as defined by Hibernate documentation reference: 3.1 - page 146.

Thanks for help.