Hello there!
While discussing about our datamodel, we realized one thing: while parent-child relationships are shown in the hierarchical graph, when using instead a property of dataType OBJECT to reference another object, this is not displayed.
I guessed this was intentional, but would like to post the following questions/comments: would it be possible for these to be also represented in the hierarchical graph? Am I wrong thinking that OBJECT references vs. parent-child relationships are not the same except that the former enforces validation (only an specific ObjectType can be assigned as a reference)? If the answer to this last question is “no, you are not wrong”, then I’d really like to see these represented in the graph at the same level as parent-child relationships 
Best,
Jose