(0) The other label will use the default overlap behavior, which depends on the object being overlapped. This value corresponds to no value being specified for a LabelDefinition overlap property.
(1) The other label will be allowed to place itself in its preferred location, ignoring this obstacle.
(2) The other label will move to minimize overlapping this obstacle, but will overlap if necessary. The other label can only move if its LabelDefinition::deconflictionStrategy allows.
(3) The other label will not be placed rather than overlap this obstacle. The other label can only move if its LabelDefinition::deconflictionStrategy allows. If it cannot move, or if there is no free position available, then the other label will not be placed.