MEC Import from XML

Greetings
I’m investigating the possibility of switching from The Events Calender to MEC. I need some assistance with importing an XML. I select the file and it imports the file – then tells me the import was successful. But no actual events are imported and frankly, I don’t know how an XML import will work without some mapping steps to go through first. What am I missing here? I cannot find any documentation on this.
Regards, Hennie