static public function fetchByParentID( $parentID, $offset = 0, $limit = null, $mainTranslation = false )
    {
        if ( $offset === 0 && $limit === null )
        {
            $limits = null;
        }
        else
        {
            $limits = array( 'offset' => $offset, 'limit' => $limit );
        }
        return self::fetchList(
            array( 'parent_id' => $parentID, 'main_tag_id' => 0 ),
            $limits,
            null,
            $mainTranslation
        );
    }