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

++<?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