Feed will support xcal (xml representation of ical). This allows us to handle event schedules (PBR) in a nice way
Feed will also support the media rss spec as part of our RSS parsing. This allows a nice way to provide links to assets (images, video, etc) within the rss feed in a standardized way.
Both of these require the tag to add additional XML namespaces (xmlns:media, xmlns:xcal).
These are used within an RSS feed like so:
<?xml version="1.0"?>
<rss version="2.0"