In general: where are requirements mapped in the IFC?

[ReD_CoDE]

Which one you prefer? The approach IfcDoc follows, or the approach IfcXtreme suggest which is node-base?

IfcX and IfcLite projects

Concept study: [IfcXtreme by Ehsan Azari] Which one is better, the approach IfcDoc follows, or the approach IfcXtreme fallows which is based on Visual Programming and Node-based approaches, and X-based too