Jon Burgess wrote:

> <Layer name="bridges" status="on" srs="...">
[snip]
> These rules will draw the motorway bridges above any secondary bridges
> regardless of the layering. I don't understand the logic behind the
> current rules, I believe they were done like this to fix some layering
> issues in some other complex junctions.

And this is one of the subjects I want to tackle, besides speed 
optimizations.

But the layering and z_ordering in osm.xml is already complex as it, and 
breaks down in some places, where you least expect it.

The major problem is the different layers and styles in the stylesheet 
have no knowledge of each other's existence, and z_ordering is done per 
mapnik <Layer>.

-- 
Lennard

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