[Playlist] [rfc] Nested playlists (and playlist chains) again

[Lucas Gonze]

Sebastian Pipping wrote:
> Lucas Gonze wrote:
>> Linking to external XSPF files is very much good practice.  Handling
>> this kind of powerful functionality gracefully is just the kind of value
>> that libSpiff can enable.
> 
> What do you have in mind?

I was thinking that there might be an API to traverse nested playlists. 
    This is risky territory because the library has to be able to fetch 
URIs.  But then again, doing the hard things only once is what 
specializing is all about.