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 backend API: add documentation & improvements #93
follow-up (re-based, to get rid of small fixes) of #92