Add filter literals and new top-level filter item
Add filter literals and new top-level filter item

florianf/mapnik-reference,gravitystorm/mapnik-reference,CartoDB/mapnik-reference,mapnik/mapnik-reference,florianf/mapnik-reference,mapycz/mapnik-reference,mapycz/mapnik-reference,CartoDB/mapnik-reference,mapnik/mapnik-reference,mojodna/mapnik-reference,gravitystorm/mapnik-reference,mojodna/mapnik-reference,mapnik/mapnik-reference