Hi. I'm working on the look-and-listen-map (toolserver project lalm), a web map portal for the Blind and Visually Impaired. That is not a rendering application like the several mapnik stylesheets running on the toolserver, but I agreed with the Admins, that it might be worth in respect of capacities of the toolserver to use the mapnik style nevertheless. Today I finally got database access and looked deeper into the schema. Most queries in my application rely on the osm_id present in all tables (and index, too), so that's not a problem. Some queries will later on require geometric queries, but here I can combine the postprocessed tables (planet_nodes, planet_line, planet_polygon...) for filtering and the non-processed ones for fetching the values - so that's okay, too. My problem lies, where mapnik does ugly tricks for rendering: I have a node-id and want to get all ways this node is part of. That would be possible, querying planet_ways, as planet_ways contains a field nodes, that is a integer-array; but as far as I know there is no performant way to query an array-field of a database on containing a particular element. Currently my code is based on a different database schema, but I have a query with the following characteristics, that I need with the osm_mapnik-scheme: IN: node_id (int) OUT: a list of way_id, where the corresponding way contains the node with id node_id. A second question would be, if errors would occur, when I combine e.g. planet_ways with planet_line in a query, and a matching row in planet_ways is pending. Usually the intermediate tables are only accessed by the import tool, so I would do unconventional things here, but am I right? If the planet_ways-row is pending, the data of this table is not in sync with the data in planet_line. regards Peter