/**
  * Init import bookmark form
  */
 private function initImportBookmarksForm()
 {
     global $lng, $ilCtrl, $ilUser;
     if (!$this->tree->isInTree($this->id)) {
         $this->ctrl->setParameter($this, 'bmf_id', '');
         $this->ctrl->redirect($this);
     }
     include_once 'Services/Form/classes/class.ilPropertyFormGUI.php';
     $form = new ilPropertyFormGUI();
     $form->setTopAnchor("bookmark_top");
     $form->setTitle($lng->txt("bkm_import"));
     $fi = new ilFileInputGUI($lng->txt("file_add"), "bkmfile");
     $fi->setRequired(true);
     $form->addItem($fi);
     $form->addCommandButton("importFile", $lng->txt('import'));
     $form->addCommandButton('cancel', $lng->txt('cancel'));
     return $form;
 }