Right now the LineOnAreaOverlayer splits lines at the area boundaries, I would also like to see an option (either in this transformer or in a new one) to split the areas based on the overlapping lines, retaining area attributes.
The current way to do it is to use an Intersector and AreaBuilder but that makes it hard to retain attributes.
I think it's a common GIS/CAD task and should be possible in FME.
