2 - cartesian coordinates
4 - always referred to as "col" and "row", not "x" and "y", since
5 the latter often have other meanings.
7 - whenever they appear together, __col__ comes first; not row.
8 This is cartesian convention.
10 - 0,0 is the "lower left" corner of the device when the
11 manufacturer specifies a canonical orientation.
13 - the unit of measurement is the smallest regular resource
15 - resources which occupy more than one unit are always addressed
16 by the lower-leftmost unit occupied.