Well explained here:
We'd output in htask microformat
And we'd need some sort of reporting. All tasks assigned to person X.
We currently usually do this with trackers. But doing it fully in the wiki would be more flexible in some contexts.
The system should be able to send email reminders at a certain date. This could be used as well to schedule actions / Email reminders as explained here:
This is part of what is needed for Project management