protected function setVatRates($vatType, $include0)
    {
        $this->vatRates = array();
        foreach ($this->possibleVatRates as $vatRate) {
            if ($vatRate[Tag::VatType] === $vatType) {
                $this->vatRates[] = $vatRate[Tag::VatRate];
            }
        }
        if ($include0) {
            $this->vatRates[] = 0.0;
        }
    }