scratch sheet for ToDo's

x.y (a.k.a. The Backlog)
/ implement bounding boxing and test performance (and function)
 \-> don't forget wraparound at (-)180 degrees
- multiple layers in one database
  - POIConnector::getLayerProperties() method
- adopt schema language for loading and default administration
  - do not store NULL values in XML
  - type safe checking of defaults
  - generalize default filtering
- pick a database migration tool
- administration of config through dashboard
- publishing API support
- JSON support as backend