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General Touchscreen Properties:

Optional properties for Touchscreens:
 - touchscreen-size-x		: horizontal resolution of touchscreen
				  (in pixels)
 - touchscreen-size-y		: vertical resolution of touchscreen
				  (in pixels)
 - touchscreen-max-pressure	: maximum reported pressure (arbitrary range
				  dependent on the controller)
 - touchscreen-fuzz-x		: horizontal noise value of the absolute input
				  device (in pixels)
 - touchscreen-fuzz-y		: vertical noise value of the absolute input
				  device (in pixels)
 - touchscreen-fuzz-pressure	: pressure noise value of the absolute input
				  device (arbitrary range dependent on the
				  controller)
 - touchscreen-inverted-x	: X axis is inverted (boolean)
 - touchscreen-inverted-y	: Y axis is inverted (boolean)

Deprecated properties for Touchscreens:
 - x-size			: deprecated name for touchscreen-size-x
 - y-size			: deprecated name for touchscreen-size-y
 - moving-threshold		: deprecated name for a combination of
				  touchscreen-fuzz-x and touchscreen-fuzz-y
 - contact-threshold		: deprecated name for touchscreen-fuzz-pressure
 - x-invert			: deprecated name for touchscreen-inverted-x
 - y-invert			: deprecated name for touchscreen-inverted-y

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