The content of element type web-app must match……等问题之解决办法

在flex整合Java生成的web.xml中添加引用servelet的代码就报错如下：

The content of element type "web-app" must match "(icon?,display-name?,description?,distributable?,context-param*,filter*,filter-mapping*,listener*,servlet*,servlet-mapping*,session-config?,mime-mapping*,welcome-file-list?,error-page*,taglib*,resource-env-ref*,resource-ref*,security-constraint*,login-config?,security-role*,env-entry*,ejb-ref*,ejb-local-ref*)". eoso/WebRoot/WEB-INF web.xml line 5

添加的代码如下：

<servlet>
    <servlet-name>downLoadServlet</servlet-name>
    <display-name>downLoadServlet</display-name>
    <servlet-class>jp.co.snjp.eos.web.odermanger.service.DownLoad</servlet-class>
    </servlet>

    <servlet-mapping>
    <servlet-name>downLoadServlet</servlet-name>
    <url-pattern>/download</url-pattern>
    </servlet-mapping>
如果把添加的代码删掉，web.xml就正常了，不会显示错误。但是这段代码是flex下载调用服务端的servlet用的，必须添加。说明，网上都是说顺序问题，但我已经按照icon?,display-name?,description?,distributable等等这种顺序添加节点的，但还是错误。后来，我把 <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">这一段校验代码删掉，问题就解决了。原因是：我添加的那部分代码符合xml文档规范，但不符合web-app_2_3.dtd所定义的规范。

类似的问题都可以这样解决

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