From: http://www.pmwiki.org/wiki/PmWiki/WebFeeds if ($action == 'rss') include_once('scripts/feeds.php'); if ($action == 'atom') include_once('scripts/feeds.php'); if ($action == 'rdf') include_once('scripts/feeds.php'); if ($action == 'dc') include_once('scripts/feeds.php'); I know what rss, atom , rdf are. What is "dc"?