- There is no explicit way to distinguish front and rear entrances in json: they are both "stairs" ("type": 3). In most case they are situated in different rooms and it is possible to check which room's description contains "rear entrance" as a substring. Probably I should introduce a separate door type for back doors.
- That's unfortunate, but I guess (i.e. I hope) it's not too hard to replace all "ref"s with something else before passing json code to the parser.
Cheers!