-- by describing summaries, views and partitions, and variations.
-- describing semantically meaningful summaries and abstractions of media content
-- in oreder to enable efficient browing and navigation
-- containing links to the media content
-- describing the organization of summaries into multiple levels of spatial/temporal detail
-- describing the a summary of a sequence of media segments
-- describing a apce or frequency view of media contents or segments
-- describing a apce or frequency decomposition or organization of view of media contents or segments
--describing variation of the media content:
compressed or low-resolution versions , different languages, different modalities(a,v,i,t etc.)
-- delivering suitable variation of media content according to the capabilities of terminal devices,environment etc.
