Default terminal emulator in GNOME 3.0

[Christoph Wickert]

I maintain several terminal emulators that used to drop an xml file
into /usr/share/gnome-control-center/default-apps/ in order to appear in
gnome-default-applications-properties. How is this handled in GNOME 3?

Is there any documentation except the outdated page at
http://live.gnome.org/ControlCenter/AddingDefaultApplications ?

Regards,
Christoph