protected function validateElement(BaseElement $element) : void
    {
        if ($element instanceof Break_) {
            $this->validateBreak($element);
        } elseif ($element instanceof Phoneme) {
            $this->validatePhoneme($element);
        } elseif ($element instanceof SayAs) {
            $this->validateSayAs($element);
        } elseif ($element instanceof Word) {
            $this->validateWord($element);
        }
    }