1. Item
   1. imageItem
      1. photo
   2. audioItem
      1. musicTrack
      2. audioBroadcast
      3. audioBook
   3. videoItem
      1. movie
      2. videoBroadcast
      3. musicVideoClip
   4. playlistItem
   5. textItem
   6. fileItem
2. containter
   1. album
      1. musicAlbum
      2. photoAlbum
   2. genre
      1. musicGenre
      2. movieGenre
   3. playlistContainer
   4. person
      1. musicArtist
   5. storageSystem
   6. storageVolume
   7. storageFolder