Hi,
Good example.
object placement. [...] avoid placing objects on top
of each other.
Exactly that can (of course not for all purposes) be an advantage instead of
a disadvantage. In mapnik, often information is simply omitted due to overlap
avoidance. This is bad if I am interested in a special topic:
If I am interested in parking, I don't want that a parking garage is left out
because there's a nail polish shop in the first floor of the same building.
Of course it would be good if the user could sort and stack the layers according
to her priorities.
Kay