ifcos-impl-relationships
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
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