struts struts-config.xml + tiles

<?xml version="1.0" encoding="ISO-8859-1" ?>

<!DOCTYPE struts-config PUBLIC
          "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN"
          "http://struts.apache.org/dtds/struts-config_1_3.dtd">

<struts-config>
        ...
    <plug-in className="org.apache.struts.tiles.TilesPlugin">
        <set-property property="definitions-config"
            value="/WEB-INF/tiles-defs.xml"/>
        <set-property property="moduleAware" value="true"/>
        <set-property property="definitions-debug" value="2" />
        <set-property property="definitions-parser-validate" value="true" />
    </plug-in>


</struts-config>