peut-on contribuer à xml?

<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
<channel>
<atom:link href="http://www.tzr.ro/seularts/rss.xml" rel="self" type="application/rss+xml" />
    <title>Seul Arts</title>     
    <link>http://www.tzr.ro/seularts/</link>
    <description>Webdesign in a BOX, [CSS: enviroment]</description>
    <item>
        <title>Ultimele noutati:</title>         
        <link>http://www.tzr.ro/seularts/calendar.php</link>
        <guid>http://www.tzr.ro/seularts/calendar.php</guid>
        <description>Ultimele noutati:</description>
    </item> 
</channel>
</rss>

 <item>
        <title>Ultimele noutati:</title>         
        <link>http://www.tzr.ro/seularts/calendar.php</link>
        <guid>http://www.tzr.ro/seularts/calendar.php</guid>
        <description>Ultimele noutati:</description>
    </item>