<?xml version="1.0"?> <resource name="stone" limited="yes" material="rm_stone"> <item weight="6000" score="10" big="yes"> <construction skill="quarrying" minskill="1" reqsize="1"/> </item> <resourcelimit> <modifier building="quarry" type="skill" value="1"/> <modifier building="quarry" type="material" value="0.5"/> <modifier race="troll" type="material" value="0.75"/> </resourcelimit> </resource>