public static function unqualify($qualifiedName, $separator = '.')
    {
        // if false, then will be 0
        $pos = strrpos($qualifiedName, $separator);
        if ($pos === false) {
            return $qualifiedName; // there is no '.' in the qualifed name
        } else {
            return substr($qualifiedName, $pos + 1); // start just after '.'
        }
    }