// methods for conversion from user interface String ----------------------

	/** clean up a request string. 
	* 	@param string $requestString from PntRequestHandler::getRequestParam
	*/
	function fromRequestData($requestString) {
		if ($requestString===null) return null;
		return $this->type == 'html'
			? $this->sanitizeHtml($requestString)
			: $this->sanitizeString($requestString);
	}