brokenco.de/_includes/pages.html

{% for item in site.data.pages.pages %}
<a href="{{ item.url | relative_url}}">{{ item.name }}</a>
{% if item.url contains ".xml" %}
<img src="/images/rss.png"
    alt="RSS"
    height="14px"
    style="margin-bottom: 0; display: inline;"/>
{% endif %}
&nbsp;&nbsp;
{% endfor %}