static function nodeAttributes()
{
  return array( 'node_id' => 'sint',
                      'path_string' => 'string',
                      'url_alias' => 'string',
                      'is_hidden' => 'boolean',
                      'is_invisible' => 'boolean',
                      'sort_field' => 'string',
                      'sort_order' => 'string',
                      'view_count' => 'sint' );
}