Index: wp-admin/includes/export.php
===================================================================
--- wp-admin/includes/export.php	(revision 11170)
+++ wp-admin/includes/export.php	(working copy)
@@ -302,7 +302,7 @@
 <?php foreach( $postmeta as $meta ) { ?>
 <wp:postmeta>
 <wp:meta_key><?php echo $meta->meta_key; ?></wp:meta_key>
-<wp:meta_value><?Php echo $meta->meta_value; ?></wp:meta_value>
+<wp:meta_value><?php echo wxr_cdata($meta->meta_value); ?></wp:meta_value>
 </wp:postmeta>
 <?php } ?>
 <?php } ?>