Listening to incoming libnotify notifications using DBus

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http://askubuntu.com – I am attempting to filter every notification through espeak. However, I can't seem to find a way to get the notification body from a python script, or even what signal_name to listen to. bus.add_signal_receiver(espeak, dbus_interface="org.freedesktop.Notifications", signal_name="??") Trying to google for this only seems to yield results involving creating new notifications, so I am completely lost now. Anyone can help me with this? In short, what I want is to listen for incoming notifications using python, and obtaining the "body" attribute of the n (HowTos)