django/tests/sitemaps_tests/templates/custom_sitemap_lastmod_index.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- This is a customised template -->
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
{% spaceless %}
{% for site in sitemaps %}
    <sitemap>
        <loc>{{ site.location }}</loc>
        {% if site.last_mod %}
        <lastmod>{{ site.last_mod|date:"c" }}</lastmod>
        {% endif %}
    </sitemap>
{% endfor %}
{% endspaceless %}
</sitemapindex>