public static function create_object($object_type = null, $ua_parent_object = null)
 {
     $error = new argent_error();
     if (!self::valid_object_type($object_type)) {
         $error->add('1036', 'Unregistered object type', $object_type, 'argent_meta');
     }
     if (!self::object_registered($ua_parent_object)) {
         $error->add('1038', 'Object does not exist', $ua_parent_object, 'argent_meta');
     }
     $object = argent_meta::register_object($object_type, $ua_parent_object);
     if (argent_error::check($object)) {
         return $object;
     }
     $record = array('object_id' => $object);
     $record = argent_meta::add_meta($record);
     $table = self::type_info($object_type);
     argent_meta::save_record($record, $table['table']);
     if ($error->has_errors()) {
         return $error;
     }
     return $object;
 }