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