<base_category_list>
 <portal_type id="Slave Instance">
  <item>causality</item>
 </portal_type>
 <portal_type id="Software Installation">
  <item>causality</item>
 </portal_type>
 <portal_type id="Software Instance">
  <item>causality</item>
 </portal_type>
</base_category_list>