text: There seems to be a lot of unneccasary redaction of doors, service rooms, staircases etc from this building.
  
     The front doors all risers and comunial area risers rooms coubards and stairs used to be available on this type of indoor render system:-
  http://github.pavie.info/openlevelup/?lat=51.747196&lon=-1.222538&z=21&t=0&lvl=0&tcd=1&urd=1&bdg=0&pic=1&nte=1#
  
  Removing these because yours system may be old and complaining is very similar to tagging for your renderer problem:- http://wiki.openstreetmap.org/wiki/Tagging_for_the_renderer
  
  stacked nodes and features are common to indoor mapped parts of the map (because that is what there is there in reality and the nodes refer to very different objects at the same horizontal co-ordinates but maybe unlinked and possibly 20 or 60 meters apart verticaly for instance.  Please read help on new tagging some of which can be read from here:-
  http://wiki.openstreetmap.org/wiki/Indoor_Mapping
  
  an example of near completed indoor render to compare with is here:-
  http://github.pavie.info/openlevelup/?lat=48.082733&lon=-1.680812&z=18&t=0&lvl=0&tcd=1&urd=1&bdg=0&pic=1&nte=1
  
  Thank you for your contributions.