On 08.03.2017 18:32, Martin Koppenhoefer wrote:
building:levels - building:min_level < 0
yes: new
no: old

I believe you are mistaken here. Consider the following example:

building:levels = 2
building:min_level = 1

According to the Simple 3D Buildings standard, this means that there is a building part with one "real" level. According to your idea, there would be two "real" levels. And there's no way to tell which interpretation was intended by the mapper.

Your proposed change would, therefore, make data mapped using these keys mostly useless due to the unresolvable ambiguity. In my opinion, that kind of cost is not worth it.

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