class
IfcRelAggregates
IfcRelAssigns
IfcRelAssignsToActor
IfcRelAssignsToControl
IfcRelAssignsToGroup
IfcRelAssignsToGroupByFactor
IfcRelAssignsToProcess
IfcRelAssignsToProduct
IfcRelAssignsToResource
IfcRelAssociates
IfcRelAssociatesApproval
IfcRelAssociatesClassification
IfcRelAssociatesConstraint
IfcRelAssociatesDocument
IfcRelAssociatesLibrary
IfcRelAssociatesMaterial
IfcRelConnects
IfcRelConnectsElements
IfcRelConnectsPathElements
IfcRelConnectsPorts
IfcRelConnectsPortToElement
IfcRelConnectsStructuralActivity
IfcRelConnectsStructuralMember
IfcRelConnectsWithEccentricity
IfcRelConnectsWithRealizingElements
IfcRelContainedInSpatialStructure
IfcRelCoversBldgElements
IfcRelCoversSpaces
IfcRelDeclares
IfcRelDecomposes
IfcRelDefines
IfcRelDefinesByObject
IfcRelDefinesByProperties
IfcRelDefinesByTemplate
IfcRelDefinesByType
IfcRelFillsElement
IfcRelFlowControlElements
IfcRelInterferesElements
IfcRelNests
IfcRelProjectsElement
IfcRelReferencedInSpatialStructure
IfcRelSequence
IfcRelServicesBuildings
IfcRelSpaceBoundary
IfcRelSpaceBoundary1stLevel
IfcRelSpaceBoundary2ndLevel
IfcRelVoidsElement