Servlet 버전별 web descriptor

servlet 4.0

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"

              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   

              xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"

              version="4.0">

</web-app>

servlet 3.1

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"

               xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"           

               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>

servlet 3.0

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

<web-app xmlns="http://java.sun.com/xml/ns/javaee"

              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

              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>