This is a very good question. Citadels are larger scale Actors which can be incorporated into other Citadels, where a Citadel is an Actor for a systems of Acto

This is a very good question. Citadels are larger scale Actors which can be incorporated into other Citadels, where a Citadel is an Actor for a systems of Actors (perhaps including IoT). See the following: http://web.stanford.edu/class/ee380/Abstracts/190123.html