Interleaving use case

I had an AI to write up a interleaving use case including two 
sub-cases; see below. Apologies for the lateness,.

[[[
In some cases, it may be necessary or desirable to interleave the 
optimised serialisations of multiple portions of a message, so that 
they can be produced and/or consumed incrementally and simultaneously. 
For example, a message containing an audio segment, a video segment and 
a SMIL file that combines them would benefit from interleaving the 
content of the audio and video segments. Another example might be a 
message that contains several video and audio streams that have varying 
relationships and playback requirements, or streams interleaved with 
other, non-streamed markup.
]]]

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Mark Nottingham   Principal Technologist
Office of the CTO   BEA Systems