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/usr/share/mediawiki-extensions/openid/SpecialOpenIDXRDS.body.php is in mediawiki-extensions-openid 2.5.

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<?php
/**
 * SpecialOpenIDXRDS.body.php -- Server side of OpenID site
 * Copyright 2006,2007 Internet Brands (http://www.internetbrands.com/)
 * Copyright 2007,2008 Evan Prodromou <evan@prodromou.name>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * @author Evan Prodromou <evan@prodromou.name>
 * @addtogroup Extensions
 */

if (!defined('MEDIAWIKI'))
	exit(1);

# Outputs a Yadis (http://yadis.org/) XRDS file, saying that this server
# supports OpenID and lots of other jazz.

class SpecialOpenIDXRDS extends SpecialOpenID {

	function SpecialOpenIDXRDS() {
		SpecialPage::SpecialPage("OpenIDXRDS", '', false);
	}

	# $par is a user name

	function execute($par) {
		global $wgOut, $wgOpenIDClientOnly;

		wfLoadExtensionMessages( 'OpenID' );
		
		# No server functionality if this site is only a client
		# Note: special page is un-registered if this flag is set,
		# so it'd be unusual to get here.
		
		if ($wgOpenIDClientOnly) {
			wfHttpError(404, "Not Found", wfMsg('openidclientonlytext'));
			return;
		}

		// XRDS preamble XML.
		$xml_template = array('<?xml version="1.0" encoding="UTF-8"?>',
							  '<xrds:XRDS',
							  '  xmlns:xrds="xri://\$xrds"',
							  '  xmlns:openid="http://openid.net/xmlns/1.0"',
							  '  xmlns="xri://$xrd*($v*2.0)">',
							  '<XRD>');

		# Check to see if the parameter is really a user name

		if (!$par) {
			wfHttpError(404, "Not Found", wfMsg('openidnousername'));
		}

		$user = User::newFromName($par);

		if (!$user || $user->getID() == 0) {
			wfHttpError(404, "Not Found", wfMsg('openidbadusername'));
		}

		// Generate the user page URL.

		$user_title = Title::makeTitle(NS_USER, $user->getName());
		$user_url = $user_title->getFullURL();

		// Generate the OpenID server endpoint URL.
		$server_title = Title::makeTitle(NS_SPECIAL, 'OpenIDServer');
		$server_url = $server_title->getFullURL();

		// Define array of Yadis services to be included in
		// the XRDS output.
		$services = array(
						  array('uri' => $server_url,
								'priority' => '0',
								'types' => array('http://openid.net/signon/1.0',
												 'http://openid.net/sreg/1.0',
												 'http://specs.openid.net/auth/2.0/signon'),
								'delegate' => $user_url),
						  );

		// Generate <Service> elements into $service_text.
		$service_text = "\n";
		foreach ($services as $service) {
		    $types = array();
		    foreach ($service['types'] as $type_uri) {
		        $types[] = '    <Type>'.$type_uri.'</Type>';
		    }
		    $service_text .= implode("\n",
									 array('  <Service priority="'.$service['priority'].'">',
										   '    <URI>'.$server_url.'</URI>',
										   implode("\n", $types),
										   '  </Service>'));
		}

		$wgOut->disable();

		// Print content-type and XRDS XML.
		header("Content-Type", "application/xrds+xml");
		print implode("\n", $xml_template);
		print $service_text;
		print implode("\n", array("</XRD>", "</xrds:XRDS>"));
	}
}