<?xml version="1.0" ?>
<codegen>
    <generate prefix="Base" renderer="net.sf.hibernate.tool.hbm2java.BasicRenderer"/> 
    <generate renderer="net.sf.hibernate.tool.hbm2java.BasicRenderer">
        <param name="generate-concrete-empty-classes">true</param>
        <param name="baseclass-prefix">Base</param>
    </generate>
</codegen>