How can I export the iTunes Playlist when the parser library loses so much information?
I have to know in which format the iTunes software can read in playlists

Notify or display in the UI which songs are unmatched.
The unmatched songs cannot be cross-exported, and the user should try to sync them.

ToDo

• Per track, display which version it has in the UI
• Per import, in the UI, show a list of tracks that were
  • found, matched
  • that are new (not found, unmatched)

Progress

• Separating already existing tracks and new tracks

This is probably a easier task than exporting the iTunes playlist as .xml

I have gave up on using polymorphism for the song classes.
After messing around with some of the features to implement,
it seems like I should give another try at polymorphism.
The overloading is too messed up.

The iTunesLibrayParser.Track would need a wrapper class.

It would be better if I started working on a separate branch.

To avoid confusion with the class name Song, "track" and "music" has been used, but without a clear guideline and is scattered rather randomly. Sort out the wording.

Sorting by custom order in a playlist.
SMPL <--> SMPL
SMPL <--> iTunes
iTunes <--> iTunes

SMPL exporting has been implemented in 710f08b, but hasn't been tested if it works. It has to be tested

Tracks such as "audiobook 2-10" gets matched to "audiobook 2-1",
since the criterion for isEqualTo() is met by the "2-1" already.

The isEqualTo implemented Find() does not find the best match,
but the earliest found acceptable.