<property_sheet_list>
 <portal_type id="Hosting Subscription">
  <item>HostingSubscription</item>
  <item>SoftwareInstance</item>
 </portal_type>
 <portal_type id="Slave Instance">
  <item>HostingSubscription</item>
 </portal_type>
 <portal_type id="Software Instance">
  <item>HostingSubscription</item>
 </portal_type>
</property_sheet_list>