mpeg-21

from The Free On-line Dictionary of Computing (8 July 2008)

MPEG-21

   <compression, standard, algorithm, file format> A {file
   format} designed to merge very different things in one object,
   so you can store interactive material in this format (audio,
   video, questions, answers, overlays, non-linear order,
   calculation from user inputs, etc.)

   [Technical details?]

   (2001-12-02)