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Servlet 2.3
<?xml version= "1.0" encoding= "UTF-8"?>
<! DOCTYPE Web-app
Public "-//sun Microsystems, INC.//DTD Web application 2.3//en"
"Http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
...
</web-app>
Servlet 2.4
<?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/J2EE"
xmlns:web= "Http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
xsi:schemalocation= "Http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version= "2.4" >
...
</web-app>
Servlet 2.5
<?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_2_5.xsd"
version= "2.5" >
...
</web-app>
Web-app header information for different versions (2.3,2.4,2.5) Web. xml