| http://www.w3.org/ns/prov#value | - X = ( ?? I 4 + ?? I 3 ) - ( ?? I 1 + ?? I 2 ) ??? i ?? Ii , ( 1 ) and Y = ( ?? I 1 + ?? I 4 ) - ( ?? I 2 + ?? I 3 ) ??? i ?? Ii , ( 2 ) wherein ??Ii is a difference of each of the currents Ii (i=1, 2, 3 and 4) before and after the touch point P is registered with the sensing area 21 of the touch panel 20.
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