diff --git a/action.php b/action.php
--- a/action.php
+++ b/action.php
@@ -1,204 +1,204 @@
 <?php
 /**
  * DokuWiki Plugin metaeditor (Action Component)
  *
  * Simple Meta Data Editor, heavily AJAX/jQuery based. 
  *
  * @license GPL 2 http://www.gnu.org/licenses/gpl-2.0.html
  * @author  Andreas Böhler <dev@aboehler.at>
  */
 
 
 // must be run within Dokuwiki
 if(!defined('DOKU_INC')) die();
 
 class action_plugin_metaeditor extends DokuWiki_Action_Plugin { 
   
   // Load the helper plugin
   public function action_plugin_metaeditor() {
         
   }
    
   // Register our hooks 
-  function register(&$controller) {
+  function register(Doku_Event_Handler $controller) {
     $controller->register_hook('AJAX_CALL_UNKNOWN', 'BEFORE', $this, 'handle_ajax_call_unknown');    
   }
   
   function handle_ajax_call_unknown($event, $param) {
     if($event->data != 'plugin_metaeditor') return;
     
     $event->preventDefault();
     $event->stopPropagation();
     global $INPUT;
     
     $action = trim($INPUT->post->str('q'));
     $pageid = trim($INPUT->post->str('r'));
     $opts = $INPUT->post->arr('opts');
     $data = array();
     $useJson = true;
     
     $perm = auth_quickaclcheck($pageid);
     if($perm == AUTH_ADMIN)
     {
         switch($action)
         {
           case 'getMeta':
             $data = $this->getMetaForPage($pageid);
             break;
           case 'getMetaValue':
             $useJson = false;
             $data = $this->getMetaValueForPage($pageid, $opts['key']);
             break;
           case 'setMetaValue':
             $data = $this->setMetaValueForPage($pageid, $opts['key'], $opts['oldval'], $opts['newval']);
             break;
           case 'deleteMetaValue':
             $data = $this->deleteMetaValueForPage($pageid, $opts['key']);
             break;
           case 'createMetaArray':
             $data = $this->createMetaArrayForPage($pageid, $opts['key'], $opts['newval']);
             break;
           case 'createMetaValue':
             $data = $this->createMetaValueForPage($pageid, $opts['key'], $opts['newkey'], $opts['newval']);
             break;
         }
     }
     else
     {
       $data = array(false, "You are not an admin");
     }
     
     
     if($useJson)
     {
       //json library of DokuWiki
       require_once DOKU_INC . 'inc/JSON.php';
       $json = new JSON();
  
       //set content type
       header('Content-Type: application/json');
       echo $json->encode($data);
     }
     else
     {
       echo $data;
     }
   }
   
   function createMetaArrayForPage($pageid, $key, $newval)
   {
     $cache = false;
     $meta = p_read_metadata($pageid, $cache);
     $m = &$meta;
     foreach($key as $k)
     {
       $m = &$m[$k];
     }
     $m[$newval] = array();
     if(p_save_metadata($pageid, $meta))
         return array(true, "Successfully saved: $newval");
     else
       return array(false, "Error saving value: $newval");  
   }
   
   function createMetaValueForPage($pageid, $key, $newkey, $newval)
   {
     $cache = false;
     $meta = p_read_metadata($pageid, $cache);
     $m = &$meta;
     foreach($key as $k)
     {
       $m = &$m[$k];
     }
     $m[$newkey] = $newval;
     if(p_save_metadata($pageid, $meta))
         return array(true, "Successfully saved: $newval");
     else
       return array(false, "Error saving value: $newval"); 
   }
   
   function setMetaValueForPage($pageid, $key, $oldval, $newval)
   {
     $cache = false;
     $meta = p_read_metadata($pageid, $cache);
     $m = &$meta;
     foreach($key as $k)
       $m = &$m[$k];
     if($m == $oldval)
     {
       $m = $newval;
       if(p_save_metadata($pageid, $meta))
         return array(true, "Successfully saved: $newval");
       else
         return array(false, "Error saving value: $newval");
     }
     else
     {
       return array(false, "Key has changed in the meantime, expected $oldval but got $m. Nothing was saved!");
     }
   
   }
   
   function deleteMetaValueForPage($pageid, $key)
   {
     $cache = false;
     $meta = p_read_metadata($pageid, $cache);
     $m = &$meta;
     for($i=0;$i<count($key);$i++)
     {
       if($i == count($key)-1)
         unset($m[$key[$i]]);
       else
         $m = &$m[$key[$i]];
     }
     if(p_save_metadata($pageid, $meta))
       return array(true, "Successfully deleted key: " . join(':', $key));
     else
       return array(false, "Error deleting key: " . join(':', $key));
   }
   
   function parseMetaTree($meta)
   {
     $out = array();
     foreach($meta as $k => $v)
     {
       $a = array();
       $a['text'] = $k;
       if(is_array($v))
       {
         $a['children'] = $this->parseMetaTree($v);
         $a['li_attr'] = array('data-type' => 'folder');
       }
       else
       {
         $a['li_attr'] = array('data-type' => 'file');
         $a['icon'] = DOKU_URL."/lib/images/page.png";
       }
       $out[] = $a;
     }
     return $out;
   }
   
   function getMetaForPage($pageid)
   {
     $cache = false;
     $meta = p_read_metadata($pageid, $cache);
     $out = $this->parseMetaTree($meta);
     return $out;
   }
   
   function getMetaValueForPage($pageid, $key)
   {
     $cache = false;
     $meta = p_read_metadata($pageid, $cache);
     foreach($key as $k)
     {
       $meta = $meta[$k];
     }
     return $meta;
   }
   
   
   
   
 }
diff --git a/plugin.info.txt b/plugin.info.txt
--- a/plugin.info.txt
+++ b/plugin.info.txt
@@ -1,7 +1,7 @@
 base	metaeditor
 author  Andreas Boehler
 email   dev@aboehler.at
-date    2015-07-15
+date    2016-04-21
 name    Meta Data Editor
 desc    Edit metadata of pages
 url     http://www.dokuwiki.org/plugin:metaeditor