It doesn't have to be webpages. I know gmail already uses schema.org for parsing flights, reservations, appointments etc from inbound mail. So it's not a huge l

It doesn't have to be webpages. I know gmail already uses schema.org for parsing flights, reservations, appointments etc from inbound mail. So it's not a huge leap to assume this could be used to mail todo,milestones etc to a contributor, and have something at the other end know what to do with it.