Just trying to get my head around playlists. I am moving away from a popular platform where the playlist information dynamically updated Roku and moving to Amazon to host metadata and video files. I am building playlists in my own CMS where each playlist has a URN and each URN owns one or more videos who in turn have a unique URN. Playlists change regularly with new videos being inserted or removed. I want to import the latest playlist information into Amazon and then update my Roku channel, can you recomend a specific method that Roku prefers, perhaps its an XML update or some other clever mechanism.