IFC Relationship Management with IfcOpenShell

Quick Reference

Decision Tree: Which Relationship Do I Need?

What are you connecting?
│
├── Spatial hierarchy (Project → Site → Building → Storey)?
│   └── Use aggregate.assign_object
│       └── Creates IfcRelAggregates
│
├── Element inside a spatial container (Wall in Storey)?
│   └── Use spatial.assign_container
│       └── Creates IfcRelContainedInSpatialStructure
│
├── Element referenced in (but not contained by) a spatial structure?
│   └── Use spatial.reference_structure