I've bounced this around some of our experts and we'd sure like more explanation of this Mark.
This presents more questions than it answers. Is the World Origin the same as the Global Origin?
How can the the Z values differ from the Elevation? And why is there an Elevation attribute if it doesn't match the Z depth?
Why would anyone want the "elevation" reported on the y-ordinate?
What do you mean by "the expression that the linestring falls in", such as the z-coordinate value of the plane?