What are the minimum fields (i.e. what are the field names) that are required to import nodes using the Import-Export API module (from the Google SoC project)?

I’m trying to convert data I have into the XML format used by that module. So far have not had a successful import when translating as closely as possible from the data I have (an MT-Import text file) to the XML format. It would help if I knew what fields are required for a new node to be created, particularly incrementing node IDs starting at the point where my current Drupal nodes leave off.

TIA.