public function process()
    {
        $operands = $this->getOperands();

        if ($operands->containsNull() === true) {
            return null;
        }

        if ($operands->exclusivelySingle() === false) {
            $msg = "The Divide operator only accepts operands with a single cardinality.";
            throw new OperatorProcessingException($msg, $this, OperatorProcessingException::WRONG_CARDINALITY);
        }

        if ($operands->exclusivelyNumeric() === false) {
            $msg = "The Divide operator only accepts operands with a baseType of integer or float.";
            throw new OperatorProcessingException($msg, $this, OperatorProcessingException::WRONG_BASETYPE);
        }

        $operand1 = $operands[0];
        $operand2 = $operands[1];

        if ($operand2->getValue() == 0) {
            return null;
        }

        $divide = floatval($operand1->getValue() / $operand2->getValue());

        return is_nan($divide) ? null : new QtiFloat($divide);
    }