In Berlin, a proposal from Lucent, et. al. was largely adopted that created a "native" encoding of media descriptors, as an alternative to SDP, and instead of a straight H.245 encoding. This has been accepted by the IETF group.
In the original proposal, constructs to describe alternative and simultaneous capabilities was discussed. The resulting TD from Berlin includes much of the concepts brought up in the proposal, including >, <, range, and QuantityOf, but does not have any reference to alternative and simultaneous.
I need some of the people who were in this part of the Berlin discussion to tell me what was decided about AND/OR, and what the syntax should be. My usual sources (Paul Sijben and John Segers) are not available at the moment.
Brian