friendica-github/mod/rsd_xml.php

<?php

if(! function_exists('rsd_xml_content')) {
function rsd_xml_content(&$a) {
	header ("Content-Type: text/xml");
	echo '<?xml version="1.0" encoding="UTF-8"?>
 <rsd version="1.0" xmlns="http://archipelago.phrasewise.com/rsd">
   <service>
     <engineName>Friendica</engineName>
     <engineLink>http://friendica.com/</engineLink>
     <apis>
       <api name="Twitter" preferred="true" apiLink="'.$a->get_baseurl().'/api/" blogID="">
         <settings>
           <docs>http://status.net/wiki/TwitterCompatibleAPI</docs>
           <setting name="OAuth">false</setting>
         </settings>
       </api>
     </apis>
   </service>
 </rsd>
	';
die();
}
}