MyEclipse alt+/ 提示 rich 标签问题

<ui:composition xmlns="http://www.w3.org/1999/xhtml"
                xmlns:s="http://jboss.org/schema/seam/taglib"
                xmlns:ui="http://java.sun.com/jsf/facelets"
                xmlns:f="http://java.sun.com/jsf/core"
                xmlns:h="http://java.sun.com/jsf/html"
                xmlns:custom="http://www.dgsoft.com/custom"
                xmlns:rich="http://richfaces.org/rich"
                xmlns:a="http://richfaces.org/a4j"
                template="/layout/template.xhtml">

命名空间如上，alt+/不提示 rich seam 标签 及其属性，什么原因及解决办法！ --------------------编程问答-------------------- 百度试试吧  。 --------------------编程问答-------------------- 看来CSDN也没有多少人了！

补充：Java ,  Eclipse