[xmonad] Question about desktop notifications

[Adam Cooper]

I've recently started running xmonad on Arch Linux, with no desktop environment, and can't seem to figure out how the desktop notifications are being generated.
- Here's a link to a snapshot, to show what my notifications currently look like: https://imgur.com/a/dLMbj3w
- Running `notify-send 'Hello world!' 'This is an example notification.'` yields the error `GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.Notifications was not provided by any .service files`.

Can anyone shed some light on this mystery?

Thank you,
Adam Cooper