<?xml version="1.0" encoding='UTF-8'?>
<!DOCTYPE hibernate-mapping PUBLIC
                      "-//Hibernate/Hibernate Mapping DTD 3.0//EN"                           "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
<hibernate-mapping package="nl.acc.model">
   <class name="SuperClazz" table="superclazz">
      <meta attribute="scope-class">public abstract</meta>
      <meta attribute="generated-class" inherit="false">nl.acc.model.hibernate.BaseSuperClazz</meta>
      <meta attribute="implement-equals">true</meta>
      <id name="id" type="java.lang.Long">
         <meta attribute="use-in-equals">true</meta>
         <generator class="native" />
      </id>
      <property name="p1" type="string" not-null="true" />
      <property name="p2" type="character" not-null="false" />
      <property name="p3" type="string" not-null="false" />
      <joined-subclass name="SubClazz"
         table="subclazz">
         <meta attribute="generated-class" inherit="false">nl.acc.model.hibernate.BaseSubClazz</meta>
         <key column="id" />
      </joined-subclass>
   </class>
</hibernate-mapping>

public abstract class BaseSubClazz extends nl.acc.model.SuperClazz implements java.io.Serializable {
    /** default constructor */
    public BaseSubClazz() {
    }

   /** minimal constructor */
    public BaseSubClazz(String p1) {
        super(p1);       
    }
   
    /** full constructor */
    public BaseSubClazz(String p1, Character p2, String p3) {
        super(p1, p2, p3);
    }
...
}