Here are the data structures with brief descriptions:

Clibinput	A handle for accessing libinput
Clibinput_device	A base handle for accessing libinput devices
Clibinput_device_group	A base handle for accessing libinput device groups
Clibinput_event	The base event type
Clibinput_event_device_notify	An event notifying the caller of a device being added or removed
Clibinput_event_keyboard	A keyboard event representing a key press/release
Clibinput_event_pointer	A pointer event representing relative or absolute pointer movement, a button press/release or scroll axis events
Clibinput_event_tablet_pad	Tablet pad event representing a button press, or ring/strip update on the tablet pad itself
Clibinput_event_tablet_tool	Tablet tool event representing an axis update, button press, or tool update
Clibinput_event_touch	Touch event representing a touch down, move or up, as well as a touch cancel and touch frame events
Clibinput_interface	Libinput does not open file descriptors to devices directly, instead open_restricted() and close_restricted() are called for each path that must be opened
Clibinput_seat	The base handle for accessing libinput seats
Clibinput_tablet_pad_mode_group	A mode on a tablet pad is a virtual grouping of functionality, usually based on some visual feedback like LEDs on the pad
Clibinput_tablet_tool	An object representing a tool being used by a device with the LIBINPUT_DEVICE_CAP_TABLET_TOOL capability