[Inkscape-user] Resources for Writing an python export script

Hi,

I want to write an exporter to another file format for inkscape. Basicly I want to take only polygons, rectangles and circles from the svg, perform some operation on them and save the result to my own xml format.

Now, I managed to write the inx file. But for how to write the python script I just cannot find enough information.

Can someone point me to information or an example giving the necessary information on how to do this?

Thanks! Nathan