{% if sitemapIndexUrls|length %}
{% set urls %}

{% for sitemapUrl in sitemapIndexUrls %}
  <sitemap>
    <loc>{{ sitemapUrl }}</loc>
    <lastmod>{{ now|date('Y-m-d') }}</lastmod>
  </sitemap>
{% endfor %}
{% endset %}
<?xml version="1.0" encoding="UTF-8"?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">{{ urls }}</sitemapindex>
{% endif %}