<?xml version="1.0"?> <resource name="iron" limited="yes" material="rm_iron"> <item weight="500" score="10"> <construction skill="mining" minskill="1" reqsize="1"/> </item> <resourcelimit> <modifier building="mine" type="skill" value="1"/> <modifier building="mine" type="material" value="0.5"/> <guard flag="mining"/> </resourcelimit> </resource>