|The 3D Development team are currently working on unifying 3D related tags.
For first results see Simple 3D Buildings.
Relation Type=site site=level level=-1 (number of basement floor) name=SubwaystationName,Levelname
A level is a floor in a building or subway station.
All elements that are on one level shall be added to the level relation. Example: There is a subway station with levels -1 and -2. The ways, platforms highway=platform and the subway stops in each floor shall be added to the relation as well as telephone booths, ticket vending machines or kiosks.
If a staircase has ways leaving the steps between two floors, a level number can also be 1.5 for example.
These level relations shall be added to a metarelation:
Relation type=site site=3d-object name=Subwaystationname
While the layer tag is a rule for the renderer which object shall be printed on top, the level represents a floor.
Please use the discussion page.