| Definition | Type | Referenced Entity |
|---|
| IfcActorRole | ENTITY | IfcExternalReferenceRelationship |
| IfcAppliedValue | ENTITY | IfcExternalReferenceRelationship |
| IfcApproval | ENTITY | IfcExternalReferenceRelationship |
| IfcConstraint | ENTITY | IfcExternalReferenceRelationship |
| IfcContextDependentUnit | ENTITY | IfcExternalReferenceRelationship |
| IfcConversionBasedUnit | ENTITY | IfcExternalReferenceRelationship |
| IfcExternalReference | ENTITY | IfcExternalReferenceRelationship |
| IfcMaterialDefinition | ENTITY | IfcExternalReferenceRelationship |
| IfcPhysicalQuantity | ENTITY | IfcExternalReferenceRelationship |
| IfcProfileDef | ENTITY | IfcExternalReferenceRelationship |
| IfcPropertyAbstraction | ENTITY | IfcExternalReferenceRelationship |
| IfcResourceLevelRelationship | ENTITY | IfcExternalReferenceRelationship |
| IfcShapeAspect | ENTITY | IfcExternalReferenceRelationship |
| IfcTimeSeries | ENTITY | IfcExternalReferenceRelationship |