join
Does this LineMark link 2 points over a missing value or does it cut the line?
When a VALUE is missing in the X or Y Dimension (meaning that the DOMAIN object has a null VALUE in this Dimension) then the point in the Path will be skipped.
use joinMissingValues = true to link the neighbour points.
use joinMissingValues = false (default) to cut the line on each missing point.