feed.xml

<?xml version="1.0" encoding="UTF-8"?>
<feed xmlns="https://www.w3.org/2005/Atom">
    <title>{{ site.title }}</title>
    {% if site.subtitle %}<subtitle>{{ site.subtitle }}</subtitle>{% endif %}
    <link rel="alternate" href="{{ get_url(absolute=true) }}" />
    <link rel="self" href="{{ get_url('feed.xml', true) }}" type="application/atom+xml" />
    <id>{{ get_url(absolute=true) }}</id>
    <updated>{{ none|date('%Y-%m-%dT%H:%M:%SZ') }}</updated>

    <author>
        <name>{{ site.author }}</name>
        {% if site.email %}<email>{{ site.email }}</email>{% endif %}
        <uri>{{ get_url(absolute=true) }}</uri>
    </author>

    {% for post in posts %}
        <entry>
            <title>{{ post.title|escape }}</title>
            <link rel="alternate" href="{{ get_url(post.url, true) }}" type="text/html" />
            <id>{{ get_url(post.url, true) }}</id>
            <updated>{{ post.timestamp|date('%Y-%m-%dT%H:%M:%SZ') }}</updated>

            {% if post.excerpt %}<summary type="html">{{ post.excerpt|absolutize|escape }}</summary>{% endif %}
            <content type="html">{{ post.content|absolutize|escape }}</content>
        </entry>
    {% endfor %}
</feed>