{# Better use a custom controller to manipulate an RSS feed. And it gives the opportunity to control cache. #}
{% if block.customAttributes is not empty %}
    {% set feedUrl, offset, limit = block.customAttributes["source"], block.customAttributes["offset"], block.customAttributes["limit"] %}
    {{ render_hinclude( controller( "eZDemoBundle:Frontpage:renderFeedBlock", {"feedUrl": feedUrl, "offset": offset, "limit": limit} ) ) }}
{% endif %}