public function __construct($allowWhiteSpace = false)
{
parent::__construct($allowWhiteSpace);
$this->_messageTemplates[self::NOT_ALPHA] = trlKwfStatic("'%value%' has not only alphabetic characters");
$this->_messageTemplates[self::STRING_EMPTY] = trlKwfStatic("'%value%' is an empty string");
}
