How to specify U-values at building scale?

Created by: oliviertournaire

I am wondering how it is possible to define U values at building scale only. Let's say that a building is modeled in LOD 0 (lod0Footprint + measuredHeight) or in LOD 1, it can be interesting for some simulation tools to define a single U value for the walls and / or the ground and / or the roof.

I can use several Construction instances and attach them to the building, but how can I differentiate them (except using a convention that fills the gml:name or gml:description)?