Need to generate XML report (when user clicks the button)from Application Express 4.0.0.00.46

I am new to Apex so I invoke all the APEX GURUS to help me !!!
Here are details.
When the user hits a button from APEX page he can download an XML report
here is the parameterized SQL query:

Duplicate thread: https://community.oracle.com/message/11325665

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Message was edited by:
sam_amc

* SessionInvalidator.java
* Created on October 27, 2006, 9:18 AM
package web;
import java.io.*;
import java.net.*;
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import javax.servlet.http.*;
* @author javious
* @version
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cheers!
Message was edited by:
javious

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c_transaction_code TYPE string VALUE 'ZCAT2',
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Need to generate XML report (when user clicks the button)from Application Express 4.0.0.00.46

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