请教：struts-config.xml 配置 plug-in 出错。
struts-config.xml 的内容：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.0//EN" "http://jakarta.apache.org/struts/dtds/struts-config_1_0.dtd">
<struts-config>
  <form-beans>
  <form-bean name="loginActionForm" type="com.webmanager.businessbasic.loginActionForm" />
  </form-beans>
  <action-mappings>
  <action name="loginActionForm" type="com.webmanager.businessbasic.loginAction" scope="request" path="/loginAction" input="/success.jsp" validate="false">
  <forward name="success" path="/ept_main_manage.jsp"/>
  <forward name="error" path="/login_error.jsp"/>
  </action>
  </action-mappings>
<plug-in className="net.sf.navigator.menu.MenuPlugIn">
  <set-property property="menuConfig" value="/WEB-INF/menu-config.xml"/>
</plug-in>
</struts-config>

启动时报错：
Parse Error at line 13 column 55: Element type "plug-in" must be declared.

org.xml.sax.SAXParseException: Element type "plug-in" must be declared.

at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)

at org.apache.xerces.util.ErrorHandlerWrapper.error(Unknown Source)

at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)

at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)

at org.apache.xerces.impl.dtd.XMLDTDValidator.handleStartElement(Unknown Source)

at org.apache.xerces.impl.dtd.XMLDTDValidator.startElement(Unknown Source)

at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)

at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)

at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)

at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)

at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
高手给个招。


------解决方案--------------------
struts版本太低，不支持plug-in标签
你用的struts-config_1_0.dtd
换成struts-config_1_2.dtd
就可以了
------解决方案--------------------
http://struts.apache.org/dtds/struts-config_1_2.dtd