Quoting [email protected]:

One more question:

I'm still trying to figure out how the OSM tile-rendering server loads its data - does it look first in 'relations', then to any related ways and nodes (top-down), or does it load all data indiscriminately based on geolocation?

Cheers,

Josef.
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Mapnik uses PostGIS. OSM data is loaded into PostGIS before it is rendered. See [1] for more information. The loading can be done with a tool like osm2pgsql.

Frank

[1] http://wiki.openstreetmap.org/wiki/Mapnik

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