SDK : web.xml file, what for ?

Hello,
I designed a new web service using the SDK, I noticed a file named web.xml, with some authority settings in it.
What's the purpose of such file ? Is it to define which roles is required to be able to call a WS ?
Thanks

Thank Ivan, can you give me more details ?
Here is my file content :
<?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/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>Extended Web Services</display-name>
     <login-config>
       <auth-method>BASIC</auth-method>
     </login-config>
     <security-constraint>
          <web-resource-collection>
               <web-resource-name>restricted methods</web-resource-name>
               <url-pattern>/*</url-pattern>
               <http-method>POST</http-method>
               <http-method>GET</http-method>
          </web-resource-collection>
          <auth-constraint>
               <role-name>Admin</role-name>
          </auth-constraint>
     </security-constraint>
</web-app>
What the purpose of the <role-name> node ? Is it referring a NW role needed to call WS ?

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import java.io.*;
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I apreciate your time.
Thanks for any help.

and the directory where i keep the servlet class is
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Hi Beau
Just Have a try.
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open it in a text editor and modify it.
%

SDK : web.xml file, what for ?

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