web.xml的schema

JavaEE5和6(对应servlet2.5和servlet3.0)在旧的命名空间:
http://java.sun.com/xml/ns/javaee/
对应的web.xml:

<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"
	version="3.0">
web-app>

---

JavaEE7(对应servlet3.1)及以后的在新的命名空间:
http://xmlns.jcp.org/xml/ns/javaee/
对应的web.xml:

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://xmlns.jcp.org/xml/ns/javaee"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee 
						http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
	version="3.1">
web-app>

---

参考: http://www.oracle.com/webfolder/technetwork/jsc/xml/ns/javaee/index.html