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parseXml example

        if ($rootNode->hasChildNodes()) {
            $xpath = new \DOMXPath($dom);
            $data = [];
            foreach ($xpath->query('namespace::*', $dom->documentElement) as $nsNode) {
                $data['@'.$nsNode->nodeName] = $nsNode->nodeValue;
            }

            unset($data['@xmlns:xml']);

            if (empty($data)) {
                return $this->parseXml($rootNode, $context);
            }

            return array_merge($data, (array) $this->parseXml($rootNode, $context));
        }

        if (!$rootNode->hasAttributes()) {
            return $rootNode->nodeValue;
        }

        $data = [];

$success = FALSE;
    $available = [];
    $site_key = Crypt::hmacBase64($base_url, $this->privateKey->get());
    $fetch_url_base = $this->updateFetcher->getFetchBaseUrl($project);
    $project_name = $project['name'];

    if (empty($this->failed[$fetch_url_base]) || $this->failed[$fetch_url_base] < $max_fetch_attempts) {
      $data = $this->updateFetcher->fetchProjectData($project, $site_key);
    }
    if (!empty($data)) {
      $available = $this->parseXml($data);
      // @todo Purge release data we don't need. See       // https://www.drupal.org/node/238950.       if (!empty($available)) {
        // Only if we fetched and parsed something sane do we return success.         $success = TRUE;
      }
    }
    else {
      $available['project_status'] = 'not-fetched';
      if (empty($this->failed[$fetch_url_base])) {
        $this->failed[$fetch_url_base] = 1;
      }