Is it possible to alter nodes on export with Node Export I want to write my own module which changes a few things upon exporting of nodes with Node Export. 
I saw that there are some API's. But I haven't seen any working examples. Is there some documentation on the API of Node Export? And if not can someone provide me with some examples of changing data for export and changing it again upon import?

Thanks,
Jaap
You can manipulate the nodes in hook_node_export_node_alter() and hook_node_export_node_import_alter()
See node_export.api.php for more information.