private function getNotes()
    {
        $xpath = $this->reader->getXpath();

        $nodes = $xpath->query($this->reader->getRoot().'/cbc:Note');
        $notes = [];
        if ($nodes->length === 0) {
            return $notes;
        }

        /** @var \DOMElement $node */
        foreach ($nodes as $node) {
            $notes[] = $node->nodeValue;
        }

        return $notes;
    }