I think I have seen bedrooms that have a sliding door only rather then door... But I may be wrong...
We altered our third bedroom (used as a study) and installed a sliding door but the builders converted the standard window on the opposite wall into a hi light non opening window. My thoughts are that it may not comply with building regulations and if I am correct, they need to convert this to one that opens. At present this does not matter to us but if we need to sell it in the future it may be a problem and I would like to get this sorted out now, if I bring this up in five years time, Aussie Living will tell me to get lost.