> > > 1) if all the SQL requests required to produce a map are in the style file > or else if there are other SQL requests not if in this file ( and where > they > are ). >
Part of SQL is wrapping and table discovery logic in Mapnik's PostGIS driver, look for all text strings in https://github.com/mapnik/mapnik/blob/333ef9fde145f88339eaccba810305707bae9b0e/plugins/input/postgis/postgis_datasource.cpp starting from line 170, and nearby files.
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