Do we want to keep the discussion about related agreements suspended? Or should we discuss and update the specification 
accordingly?
 
If so:
1)
We need discussion about the kind of meta-information that each related agreement should be associated with. 
In particular: do we need to define canonical types of relationships in the spec like we did before, such as dependency,
 composition...  I am referring to the different types of related agreements that started to be identified in OGSI-
Agreement (back in the day...). 

2)
We may want to have a placeholder for domain-specific relationship type such as "advance reservation"... Which makes me 
think that such as thing as "reservationID" could be a term more than a part of the context....

3)
Also, OGSI-Agreement says relationship can be modified at run-time: that is not in favor of specifying the related 
agreements in the context. Or maybe those are only for relationships which cannot change during the lifecycle of the 
agreement?
.