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web.xml - DTD and XSD

There are two ways to specify the schema for a the web.xml file (Deployment Descriptor).

  • DTD - Document Type Definition
  • XSD - XML Schema Definition

The XSD version is preferred since JSP 2.0 / Servlets 2.4 (eg: Tomcat 5.5). Note that the XML encoding can be specified as ISO-8859-1, UTF-8, or any other valid encoding in either version, and should match the actual encoding of your text file.

XSD example for JSP 2.2 / Servlets 3.0 (Tomcat 7.0):

<?xml version="1.0" encoding="ISO-8859-1"?>
<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>

XSD example for JSP 2.1 / Servlets 2.5 (Tomcat 6.0):

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
     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>

XSD example for JSP 2.0 / Servlets 2.4 (Tomcat 5.5):

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     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>

DTD example for JSP 1.2 / Servlets 2.3 (Tomcat 5):

<?xml version="1.0" encoding="ISO-8859-1"?> 
<!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>

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