Observe that semantic information cannot be stored with a LoD1 building.
No semantics is used for the faces.
gml:Solidand 9 bounding surfaces.
xlink are used to reuse the surface and have both representations.
This is not recommended, because the volume of the building cannot be computed for instance.
gml:Solidand 11 bounding surfaces since the roof overhangs are modelled
Observe that the roof overhangs are modelled as boundary surfaces, and are not part of the
gml:Solid since that would create an invalid one (non-manifold case).
The volume of the building has been subdivided into 2 by adding the ceiling of the ground floor. The boundary surfaces with semantics are present.