PGMapCSS is a library for PostgreSQL/PostGIS which works between an osm2pgsql based database and Mapnik (and maybe other renderers). It processes database (usually OpenStreetMap) objects according to MapCSS rules and calculates resulting colors, widths and other properties for Symbolizers, even geometric modifications.
GNU Affero General Public License v3.0
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DB/Overpass: parse complete json answer from Overpass #116
Before, every element has been parsed with json.loads(), but loading the whole server response is much faster. It needs more RAM though ...