Jinja2 template for an Atom feed.

atom.html

<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
    <title>{{ SITENAME }}</title>
    <link rel="alternate" type="text/html" href="{{ FEED_DOMAIN }}" />
    <link rel="self" type="application/atom+xml" href="{{ FEED_DOMAIN }}/feeds/atom.xml" />
    <id>{{ FEED_DOMAIN }}/</id>
{% if articles %}
{% for article in articles %}
{% if loop.first %}
    <updated>{{ article.date_utc.strftime('%Y-%m-%dT%H:%I:%SZ') }}</updated>
{% endif %}
<entry>
    <title>{{ article.title|striptags|e }}</title>
    {% if article.link %}
    <link rel="via" type="text/html" href="{{ article.link|e }}" />
    {% else %}
    <link rel="alternate" type="text/html" href="{{ FEED_DOMAIN }}/{{ article.url }}" />
    {% endif %}
    <id>tag:{{ SITEHOST }},{{ article.date_utc.strftime('%Y-%m-%d') }}:{{ article.url }}</id>
    <updated>{{ article.date_utc.strftime('%Y-%m-%dT%H:%I:%SZ') }}</updated>
    <summary type="html">
      {{ article.summary|e }}
    	{% if article.link %}
    	&lt;p&gt;&lt;a href="{{ FEED_DOMAIN }}/{{ article.url }}"&gt;Permalink&lt;/p&gt;
    	{% endif %}
    </summary>
    <author>
        <name>{{ article.author }}</name>
    </author>
    {% if article.category %}
    <category term="{{ article.category }}" />
    {% endif %}
    {% for tag in article.tags %}
    <category term="{{ tag }}" />
    {% endfor %}
    <content type="html">
    	{{ article.content|e }}
    	{% if article.link %}
    	&lt;p&gt;&lt;a href="{{ FEED_DOMAIN }}/{{ article.url }}"&gt;Permalink&lt;/p&gt;
    	{% endif %}
    </content>
</entry>
{% if loop.index >= 20 %}
	{% break %}
{% endif %}
{% endfor %}
{% endif %}
</feed>