Write a Python script to convert simple KML to GPX - helpful if you know about maps and XML

The task is to write a Python script that will take a simple KML file and transform it into a GPX file. KML and GPX are both types of XML. You may use libraries if you wish, but the script must be able to run on Google AppEngine, so using GPSBabel or OGR2OGR would be rather hard. I would be happy with a script that works on even a subset of KML files. If you get this far, then I would pay you for additional work to make the script more robust, and to handle more KML inputs. KML can have much more data types than GPX. GPX files basically only have waypoints and routes, while KML can have much more. So, your script will ignore data in the KML in some cases. To help you, we will provide: * a python script that parses KML into objects (but not GPX) * a sample KML to parse that will prove your project works