Merci Marc!
Je n'étais pas sur d'avoir compris totalement, aussi en raison du "xml" (qui n'est pas le format le plus approprié pour de import/export d'information)
So, for importation of events, this is not in the near future developpement, but i think later, it could possible to think of something as import in csv format, some events from a table file.
But to make a study for such a feature, examples from different users could be useful (for example, import from Google agenda, ical, other joomla extension, etc...)