SimpleXML: Modificar valores

<?xml version="1.0" encoding="UTF-8"?>
<feed>
    ...
    <name>10 Years</name>
    ...
</feed>

<?xml version="1.0" encoding="UTF-8"?>
<feed>
    ...
    <name>Miss Coder</name>
    ...
</feed>

<?php
$feed = "http://www.domain.com/feed/info.xml";
// volcar el feed en un objeto SimpleXML
$xml = simplexml_load_file($feed);
$xml->name = "Miss Coder";
?>