getFullOpenTag example

return sprintf($salesChannelContext->getSalesChannel()->getId() . '-' . self::SITEMAP_NAME_PATTERN, '-' . $this->domainName, $index ?? $this->index);
    }

    private function printHeader(): void
    {
        /** @var SitemapFilterOpenTagEvent $sitemapOpenTagEvent */
        $sitemapOpenTagEvent = $this->eventDispatcher->dispatch(
            new SitemapFilterOpenTagEvent($this->context)
        );

        gzwrite($this->handle, $sitemapOpenTagEvent->getFullOpenTag());
    }

    private function printFooter(): void
    {
        gzwrite($this->handle, '</urlset>');
    }

    private function cleanUp(): void
    {
        try {
            $files = $this->filesystem->listContents($this->getPath($this->context));
        }