Java EE (Java Enterprise Edition) General Discussion

I've tried to execute the following file web.xml:

<?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">
<!--
tpcw.xml - web.xml for the TPC-W web application.
Copyright 2003 by Jan Kiefer.

This file is distributed "as is". It comes with no warranty and the
author takes no responsibility for the consequences of its use.

Usage, distribution and modification is allowed to everyone, as long
as reference to the author(s) is given and this license note is included.
-->
<web-app>
<display-name>TPC-W</display-name>
<description>
TPC-W Java Implementation
</description>

<servlet>
<servlet-name>TPCW_home_interaction</servlet-name>
<servlet-class>TPCW_home_interaction</servlet-class>
</servlet>
<servlet>
<servlet-name>TPCW_shopping_cart_interaction</servlet-name>
<servlet-class>TPCW_shopping_cart_interaction</servlet-class>
</servlet>
<servlet>
<servlet-name>TPCW_order_inquiry_servlet</servlet-name>
<servlet-class>TPCW_order_inquiry_servlet</servlet-class>
</servlet>
<servlet>
<servlet-name>TPCW_order_display_servlet</servlet-name>
<servlet-class>TPCW_order_display_servlet</servlet-class>
</servlet>
<servlet>
<servlet-name>TPCW_search_request_servlet</servlet-name>
<servlet-class>TPCW_search_request_servlet</servlet-class>
</servlet>
<servlet>
<servlet-name>TPCW_execute_search</servlet-name>
<servlet-class>TPCW_execute_search</servlet-class>
</servlet>
<servlet>
<servlet-name>TPCW_new_products_servlet</servlet-name>
<servlet-class>TPCW_new_products_servlet</servlet-class>
</servlet>
<servlet>
<servlet-name>TPCW_best_sellers_servlet</servlet-name>
<servlet-class>TPCW_best_sellers_servlet</servlet-class>
</servlet>
<servlet>
<servlet-name>TPCW_product_detail_servlet</servlet-name>
<servlet-class>TPCW_product_detail_servlet</servlet-class>
</servlet>
<servlet>
<servlet-name>TPCW_customer_registration_servlet</servlet-name>
<servlet-class>TPCW_customer_registration_servlet</servlet-class>
</servlet>
<servlet>
<servlet-name>TPCW_buy_request_servlet</servlet-name>
<servlet-class>TPCW_buy_request_servlet</servlet-class>
</servlet>
<servlet>
<servlet-name>TPCW_buy_confirm_servlet</servlet-name>
<servlet-class>TPCW_buy_confirm_servlet</servlet-class>
</servlet>
<servlet>
<servlet-name>TPCW_admin_request_servlet</servlet-name>
<servlet-class>TPCW_admin_request_servlet</servlet-class>
</servlet>
<servlet>
<servlet-name>TPCW_admin_response_servlet</servlet-name>
<servlet-class>TPCW_admin_response_servlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>TPCW_home_interaction</servlet-name>
<url-pattern>/TPCW_home_interaction</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>TPCW_shopping_cart_interaction</servlet-name>
<url-pattern>/TPCW_shopping_cart_interaction</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>TPCW_order_inquiry_servlet</servlet-name>
<url-pattern>/TPCW_order_inquiry_servlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>TPCW_order_display_servlet</servlet-name>
<url-pattern>/TPCW_order_display_servlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>TPCW_search_request_servlet</servlet-name>
<url-pattern>/TPCW_search_request_servlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>TPCW_execute_search</servlet-name>
<url-pattern>/TPCW_execute_search</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>TPCW_new_products_servlet</servlet-name>
<url-pattern>/TPCW_new_products_servlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>TPCW_best_sellers_servlet</servlet-name>
<url-pattern>/TPCW_best_sellers_servlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>TPCW_product_detail_servlet</servlet-name>
<url-pattern>/TPCW_product_detail_servlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>TPCW_customer_registration_servlet</servlet-name>
<url-pattern>/TPCW_customer_registration_servlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>TPCW_buy_request_servlet</servlet-name>
<url-pattern>/TPCW_buy_request_servlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>TPCW_buy_confirm_servlet</servlet-name>
<url-pattern>/TPCW_buy_confirm_servlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>TPCW_admin_request_servlet</servlet-name>
<url-pattern>/TPCW_admin_request_servlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>TPCW_admin_response_servlet</servlet-name>
<url-pattern>/TPCW_admin_response_servlet</url-pattern>
</servlet-mapping>

<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>

</web-app>

but I've received the following error:

BUILD FAILED
C:\ant\bin\tpcw\WEB-INF\web.xml:15: Unexpected element "web-app" web-app

Can you help me?