text: CREATE TABLE 'zones' (ogc_fid    INTEGER PRIMARY KEY,
                        zone_id    INTEGER UNIQUE NOT NULL,
                        area       NUMERIC,
                        "name"     TEXT,
                        population INTEGER,
                        employment INTEGER);
  
  --#
  SELECT AddGeometryColumn( 'zones', 'geometry', 4326, 'MULTIPOLYGON', 'XY', 1);
  --#
  CREATE UNIQUE INDEX idx_zone ON zones (zone_id);
  --#
  SELECT CreateSpatialIndex( 'zones' , 'geometry' );
  --#
  INSERT INTO 'attributes_documentation' (name_table, attribute, description) VALUES('zones','zone_id', 'Unique node ID');
  --#
  INSERT INTO 'attributes_documentation' (name_table, attribute, description) VALUES('zones','area', 'Area of the zone in km2');
  --#
  INSERT INTO 'attributes_documentation' (name_table, attribute, description) VALUES('zones','name', 'Name of the zone, if any');
  --#
  INSERT INTO 'attributes_documentation' (name_table, attribute, description) VALUES('zones','population', "Zone's total population");
  --#
  INSERT INTO 'attributes_documentation' (name_table, attribute, description) VALUES('zones','employment', "Zone's total employment");
  