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.
During compiling the eval functions will be called to guess possible result values, but not within the context of a database functions, though many eval functions need access to the module plpy. Use fake_plpy (from mode standalone) to emulate plpy.
During compiling the eval functions will be called to guess possible result values, but not within the context of a database functions, though many eval functions need access to the module plpy. Use fake_plpy (from mode standalone) to emulate plpy.