- decision how to handle the Extent storage (by forced-cast)
- decision to place the administrative record directly into the Extent
TODO not clear yet how to handle the implicit limitation for future deadlines
- define a simple record to represent the Activity
- define a handle with an ordering function
- low-level functions to...
+ accept such a handle
+ pick it from the entrace queue
+ pass it for priorisation into the PriQueue
+ dequeue the top priority element
