Hi!

I've been working with Mapnik, enjoying it, and having some success...
except, I'm failing to generate the same green/preserve areas
openstreetmap.org has despite an unmodified-from-svn osm.xml file, for
example  ->

http://liquidcycles.com/osm-rendering-of-marin-headlands.png
http://liquidcycles.com/attempt-to-copy-osm-rendering-of-marin-headlands.png

(This is the peninsula just north of San Francisco if that helps at all)

Zooming out, is there an intro doc/wiki/etc to navigating/modifying the
default OSM map-styling?  I'm finding it tricky to relate specific Rule and
Filter blocks to the tiles/images being generated.  I've had good success
querying the planet_osm_nodes table to find tags for a given point, but
as-of-yet unable to replicate this trick for polygons (which I suspect the
problem above may involve).

If not, I can add/write a doc as I learn :)

Thanks in advance for any help!

Kevin
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