+---+
           +--------|Fs2+-----------+
           |        +-.-+           |
           |          |             |
         +-+--+    +--+----+     ,--+--.
         |User|    |Content|    (Request)
         +----+    +.-----++     `-----'
                    |     |
                    |    ++-------+
                    |    |Playlist|
                    |    +--------+
                    |
                    |
 +-----+        +---+-+  +-----------+
 |Video+--------|Media|..|Interactive|
 +-----+        +.-.-.+  +-----------+
 +-----+         | | |   +-----+
 |Audio+.......... | ....|Other|
 +-----+           |     +-----+
           +-------'--+
           |Executable|
           +----------+