public function get_post_trid($args)
 {
     list($blog_id, $username, $password, $element_id) = $args;
     if (!$this->sitepress->get_wp_api()->get_wp_xmlrpc_server()->login($username, $password)) {
         return $this->sitepress->get_wp_api()->get_wp_xmlrpc_server()->error;
     }
     $post_element = new WPML_Post_Element($element_id, $this->sitepress);
     return $post_element->get_trid();
 }