这些都什么标签？

Question

<%@ taglib uri="http://www.springframework.org/security/tags" prefix="security" %>
<%@ taglib uri="http://displaytag.sf.net" prefix="display" %>
<%@ taglib uri="http://struts-menu.sf.net/tag-el" prefix="menu" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<%@ taglib uri="http://www.opensymphony.com/oscache" prefix="cache" %>
<%@ taglib uri="http://www.opensymphony.com/sitemesh/decorator" prefix="decorator"%>
<%@ taglib uri="http://www.opensymphony.com/sitemesh/page" prefix="page"%>
<%@ taglib uri="http://www.appfuse.org/tags/struts" prefix="appfuse" %>
求文档