You're reading the documentation for an older, but still supported version (1.33.4).
For information on the latest version, please have a look at 1.33.5.

MOVE_MODE

This enumeration specifies how the target position is expressed when motion is controlled in the robot controller, and is defined as follows.

Value	Constant Name	Description
0	MOVE_MODE_ABSOLUTE	Absolute Coordinate
1	MOVE_MODE_RELATIVE	Relative Coordinate

Defined in: DRFC.h

typedef enum {
    MOVE_MODE_ABSOLUTE = 0,
    MOVE_MODE_RELATIVE,
} MOVE_MODE;