allow discourse extensions

mergedrss.php

@@ -105,7 +105,7 @@ public function export($return_as_string = true, $output = false, $limit = null,
 
 		// set all the initial, necessary xml data
 		$xml =  "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
-    $xml .= "<rss version=\"2.0\" xmlns:content=\"http://purl.org/rss/1.0/modules/content/\" xmlns:wfw=\"http://wellformedweb.org/CommentAPI/\" xmlns:dc=\"http://purl.org/dc/elements/1.1/\" xmlns:atom=\"http://www.w3.org/2005/Atom\" xmlns:sy=\"http://purl.org/rss/1.0/modules/syndication/\" xmlns:slash=\"http://purl.org/rss/1.0/modules/slash/\" xmlns:itunes=\"http://www.itunes.com/DTDs/Podcast-1.0.dtd\" xmlns:media=\"http://search.yahoo.com/mrss/\" xmlns:psc=\"http://podlove.org/simple-chapters\" xmlns:fh=\"http://purl.org/syndication/history/1.0\" xmlns:podcast=\"https://podcastindex.org/namespace/1.0\" xmlns:cc=\"http://cyber.law.harvard.edu/rss/creativeCommonsRssModule.html\" xmlns:friends=\"wordpress-plugin-friends:feed-additions:1\" >\n";
+    $xml .= "<rss version=\"2.0\" xmlns:content=\"http://purl.org/rss/1.0/modules/content/\" xmlns:wfw=\"http://wellformedweb.org/CommentAPI/\" xmlns:dc=\"http://purl.org/dc/elements/1.1/\" xmlns:atom=\"http://www.w3.org/2005/Atom\" xmlns:sy=\"http://purl.org/rss/1.0/modules/syndication/\" xmlns:slash=\"http://purl.org/rss/1.0/modules/slash/\" xmlns:itunes=\"http://www.itunes.com/DTDs/Podcast-1.0.dtd\" xmlns:media=\"http://search.yahoo.com/mrss/\" xmlns:psc=\"http://podlove.org/simple-chapters\" xmlns:fh=\"http://purl.org/syndication/history/1.0\" xmlns:podcast=\"https://podcastindex.org/namespace/1.0\" xmlns:cc=\"http://cyber.law.harvard.edu/rss/creativeCommonsRssModule.html\" xmlns:friends=\"wordpress-plugin-friends:feed-additions:1\" xmlns:discourse=\"http://www.discourse.org/\" >\n";
     $xml .= "<generator>Freifunk API Feed Aggregator with the help of https://atom.geekhood.net/</generator>\n";
 		$xml .= "<channel>\n";
 		if (isset($this->myTitle)) { $xml .= "\t<title>".$this->myTitle."</title>\n"; }