<?xml version="1.0" encoding="UTF-8"?>编译报错

新建一个动态web项目，web.xml的第一行报错，但是好像不影响程序运行 <?xml version=”1.0″ encoding=”UTF-8″?> 错误内容如下： The errors below were detected when validating the file “javaee_6.xsd” via the file “web.xml”. In most cases these errors can be detected by validating “javaee_6.xsd” directly. However it is possible that errors will only occur when javaee_6.xsd is validated in the context of web.xml.
20分	web.xml 是用eclipse自动生成的吗？还是自己从别的地方拷贝修改的，重点是javaee_6.xsd 哪里来的？
	报错的文件 <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>aa</display-name> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app> 第二行改成下面的样子就不报错了 <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>0001</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> </web-app> 下面正确的文件是Version: Juno Release的eclipse自动生成的上面报错的是Release2
	但是不清楚为什么，请指教

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