customize RSS

[acyk]

dear all

I wonder if is that possible that I can customize the output of RSS feed via editing external.php or something ?

for some reason , my partner need me to feed the data with their own RSS style

PHP Code:

++<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0">
  <channel>
        <title><![CDATA[website name]]></title>
       <link>WebLink</link>
        <description><![CDATA[website description]]></description>
        <pubDate>Last Update【Example：Sun, 19 Oct 2008 15:35:00 +0000】</pubDate>
        <copyright>Copyright【 Example：Copyright 2009 Hang.la All rights reserved. 】</copyright>
        <generator>Creator【 Example：bbb.com 】</generator>
        <language>zh</language>
        <item>
        <author><![CDATA[Authur]]></author>
         <title><![CDATA[Title]]></title>
          <link>Link of article</link>
          <guid>Link of article( unique )</guid>
          <description><![CDATA[content]]></description>
        <hangcategory><![CDATA[category]]></hangcategory>
        <hangimage><![CDATA[image]]></hangimage>
        <priority>priority from 1~5</priority>
          <pubDate>Publish【 Example：Sun, 19 Oct 2008 15:35:00 +0000】</pubDate>
     </item>
     <item>
        …
     </item>
  </channel>
</rss>

please give me some advise , and how to do this , thanks