On Sat, Aug 22, 2009 at 7:43 PM, Peter Childs<pchilds at bcs.org> wrote: The problem with this tag is that it's about topology. "up/down" is like "north/west" or "turn left/right". Like the tag "is_in", it shouldn't be a tag to say where a point or a pair of points is geospatialized. Pieren