I'd note that this probably needs an update to include the stuff from http://tools.ietf.org/html/draft-roach-mmusic-groupid-00 Adding an 'id' attribute should be trivial, i am not so sure about in-group yet. This looks alot like the stuff I came up when doing bundle-over-jingle initially, i.e. each content specified which bundles it was in.
oh, that comment applies to "jingle grouping framework", not to this one.
