--- a/wp/wp-includes/feed-rdf.php	Mon Jun 08 16:11:51 2015 +0000
+++ b/wp/wp-includes/feed-rdf.php	Tue Jun 09 03:35:32 2015 +0200
@@ -8,7 +8,11 @@
 header('Content-Type: ' . feed_content_type('rdf') . '; charset=' . get_option('blog_charset'), true);
 $more = 1;
 
-echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
+echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>';
+
+/** This action is documented in wp-includes/feed-rss2.php */
+do_action( 'rss_tag_pre', 'rdf' );
+?>
 <rdf:RDF
 	xmlns="http://purl.org/rss/1.0/"
 	xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
@@ -30,10 +34,14 @@
 	<link><?php bloginfo_rss('url') ?></link>
 	<description><?php bloginfo_rss('description') ?></description>
 	<dc:date><?php echo mysql2date('Y-m-d\TH:i:s\Z', get_lastpostmodified('GMT'), false); ?></dc:date>
-	<?php /** This filter is documented in wp-includes/feed-rss2.php */ ?>
-	<sy:updatePeriod><?php echo apply_filters( 'rss_update_period', 'hourly' ); ?></sy:updatePeriod>
-	<?php /** This filter is documented in wp-includes/feed-rss2.php */ ?>
-	<sy:updateFrequency><?php echo apply_filters( 'rss_update_frequency', '1' ); ?></sy:updateFrequency>
+	<sy:updatePeriod><?php
+		/** This filter is documented in wp-includes/feed-rss2.php */
+		echo apply_filters( 'rss_update_period', 'hourly' );
+	?></sy:updatePeriod>
+	<sy:updateFrequency><?php
+		/** This filter is documented in wp-includes/feed-rss2.php */
+		echo apply_filters( 'rss_update_frequency', '1' );
+	?></sy:updateFrequency>
 	<sy:updateBase>2000-01-01T12:00+00:00</sy:updateBase>
 	<?php
 	/**