On Wed, 17 Nov 2010 18:20:39 +0100, M∡rtin Koppenhoefer <dieterdreist at gmail.com> wrote: > Btw: isn't a rendering a derived database as well? A database of pixels? I would not regard a printed map as a database. And neither would I the electronic version of that. One could argue about a "rendered" vector map. Matthias