Comment 14 for bug 938180

No, I don't think that they use such a format. There is a "spotiy" folder with alot of c++ code in it, so I think it is an active plugin, not a passive config format.
Yeah, may be we will need special case code but I think that it is easier than coding everything directly into Mixxx. And because of licensing of spotify and probably other services we will need external plugins to install.
Syntax could be like my proposition but of course XML is only a useful format.

I will try to have a closer look at the spotify plugin of Clementine if I got some time.