New media ID naming standards

Instead of media/@id being unique for all media elements, separate out the
media elements into these "domains":

1. audio
2. video
3. image

Each "domain" has its own ID-space. Audio and video ids are of the format
n123 (though actually the only requirement is for the id to be prefixed by
the event type id).

Instead of having "media" elements we have "audio", "video" and "image"
elements.

So we can have <audio id="n123".../> and <video id="n123".../> without any
problem. This is what archives was doing before so we can reuse those IDs -
i.e. the exist "N123" MD will still be referred to as "n123".

Photo IDs are yet to be finalized but will probably be something like:

n123 or n20090409-180000

As far as ts4isha is concerned, it doesnt matter so long as the uniqueness
is properly observed.

Original issue reported on code.google.com by mjc1...@gmail.com on 9 Apr 2009 at 10:14

marcardar / transcriptstudio-isha

New media ID naming standards #122