Something I've been thinking about for quite a while, since my SMIL1.0 publishing days is coming up with a way to associate an OPML file with media referred to in an RSS enclosure. Primarily as a means to provide time-based shownotes for search and discovery of the content in the media file. This could then evolve into huge potential for a/v media client developers and producers to create time-based content based around media fed via RSS feeds.
To achieve this, how about:
I'd like to see a new optional attribute in the enclosure tag of RSS called 'opmlUrl'
this would point to an OPML file via http or local file protocols.
This OPML file would have outline elements with an attribute called 'time' along with the other reccommended attributes.
The format of time could be something like hh:mm:ss.nnn hours: minutes:seconds.milliseconds
The text attribute used as required (but mandatory)
This would provide a means to outline the content of a media file provided via an RSS feed and also provide an opportunity for client developers to display time-based, sychronised informational content and links etc while consuming the media file (audio, video, etc.).