Its Learning compatible XML is generated based on the course plan.

To use the XML:

1. Download the xml file
2. Go to the relevant room
3. Go to plans
4. In the upper-right corner: ... -> Import/Export
5. Click Choose File and select the xml file
6. Click Import. There will be an update of the text syaing that the XML has been imported
7. Click Go back to plans
8. Review and delete obsolete plans

No official guide to this was found. Some XML developper resources are here.