--+--root
  |
  +--+--Master--(QString Key)            :: TreeItem
  |  +-----(QString key, QString value)
  |  +-----("Title", TitleName)
  |  +...
  |
  +--+--Dictionary--(QString Key)        :: TreeItem
  |  +-----(QString key, QString suffix, QString value, QString postfix)
  |  +...
  |
  +--+--Phonemes--(QString Key)          :: TreeItem as a root node of the pronounce
     +--+--(QString Key)
     |  +--(int note, QString FilePath, float msLeftBlank, ...)
     |  +...
     |
     +...