Comment 33 for bug 671632

@infarmer: I still need crates and subcrates

Yes, we now, that is the essence of the bug. There are just so many ways to implement it and I want to make sure we do it just right and in line with future smart crates.

Looking at the competitors is not a bad idea:
Traktor: Playlists, no Crates -> Folders of Playlists / Subfolder of Playlists
Serato: Crates and Samart Crates -> Crates can contain sub Crates along with tracks.
VirtualDJ: Playlists and Crates -> Folders of Playlists / Subfolder of Playlists / Crates can contain sub Crates along with tracks.

For me the playlist folders are pretty clear, but we have four options for the crates:

1) The same as playlists (Traktor)
      * a folder / subfolder can only contain crates / Playlists
2) Like file system folders (Virtual DJ / Serato)
      * a folder is a crate and can contain tracks and other crates
3) Like recursive file system folders
      * a folder is a meta crate, it cant contain own tracks, but displays the tracks of all sub crates.
4) Like a tag system / smart crates
      * A crate can be member of more than one parent crate

What is you preference?