session management in wayland

[zahlenmeer at gmx.de]

Hi,
I am curious how session management works in wayland? In X we have xsmp,
but I couldn't find something similar for wayland. The documentation
briefly touches session compositors, but I couldn't find out if there's
a protocol defined or how basic session save/restore and other session
manager tasks work. Could anyone explain this to me?

Kind regards