<hierarchy>
	<object>/upgrade/planet/aerial.xml</object>
	<object>/upgrade/planet/airport.xml</object>
	<object>/upgrade/planet/mine.xml</object>
	<object>/upgrade/planet/nuke.xml</object>
	<object>/upgrade/planet/powerplant.xml</object>
<!--	<object>/upgrade/planet/redbutton.xml</object>-->
	<object>/upgrade/planet/ship.xml</object>
	<object>/upgrade/planet/squadron.xml</object>
	<object>/upgrade/planet/starport.xml</object>
	<object>/upgrade/planet/support1.xml</object>
	<object>/upgrade/planet/support2.xml</object>
	<object>/upgrade/planet/support3.xml</object>
	<object>/upgrade/planet/support4.xml</object>
</hierarchy>
