View source for Talk:DBus-spec

I am placing myself in the position of a developer writing a complete client for Rhythmbox which should implement this interface.  
I think there are two missing functionalities:
* How do I save/load a tracklist? In Rhythmbox, the playlist are saved in one xml file transparent to the user but in beep-media-player, they are save as .pls if I'm not mistaken.  The mechanism should take that into consideration.
* Is there away to filter the tracklist? For example, if I want to list all the tracks for a particular album, how could I do this?
BTW, this is a great idea, I'll hope to be able to use it in a upcoming project soon!