I have two classes Form and a Group (of questions). A Form can contain a Group (of Questions). Similary a Group can contain another Group of questions.

Here are my POJOs:

public class Form {

private String formId;
private String formName;
private Set areas = new HasSet();

}


public class Group{

private String groupId
private String groupName;
private Set groups= new HasSet();

}

I know how to define a mapping for the Form class (given below).
<hibernate-mapping>

<class name="dci.model.Form" table="form">
<id name="formId" column="formId">
<generator class="native"/>
</id>
<property name="formName" />
<property name="formDescription"/>
<set name="groups" table="form_area" lazy="false" cascade="all">
<key column="formId"/>
<many-to-many column="groupId" class="dci.model.Group"/>
</set>
</class>

</hibernate-mapping>

How do I do definite this set mapping for a Group? Since a group can contain other Groups. I want to be able to do something to the effect:

<set name="groups" table="group_definition" lazy="false" cascade="all">
<key column="groupId"/>
<many-to-many column="subGroupId" class="dci.model.Group"/>

Thanks for your reply (in advance).

Is this even possible? Seems like it should be. I followed the example of "kittens" and "Cats" in the hibernate documentation but that didn't help. Any one have any ideas?