Entities (801)

• IfcActionRequest
• IfcActor
• IfcActorRole
• IfcActuator
• IfcActuatorType
• IfcAddress
• IfcAdvancedBrep
• IfcAdvancedBrepWithVoids
• IfcAdvancedFace
• IfcAirTerminal
• IfcAirTerminalBox
• IfcAirTerminalBoxType
• IfcAirTerminalType
• IfcAirToAirHeatRecovery
• IfcAirToAirHeatRecoveryType
• IfcAlarm
• IfcAlarmType
• IfcAlignment
• IfcAlignment2DHorizontal
• IfcAlignment2DHorizontalSegment
• IfcAlignment2DSegment
• IfcAlignment2DVerSegCircularArc
• IfcAlignment2DVerSegLine
• IfcAlignment2DVerSegParabolicArc
• IfcAlignment2DVertical
• IfcAlignment2DVerticalSegment
• IfcAlignmentCurve
• IfcAnnotation
• IfcAnnotationFillArea
• IfcApplication
• IfcAppliedValue
• IfcApproval
• IfcApprovalRelationship
• IfcArbitraryClosedProfileDef
• IfcArbitraryOpenProfileDef
• IfcArbitraryProfileDefWithVoids
• IfcAsset
• IfcAsymmetricIShapeProfileDef
• IfcAudioVisualAppliance
• IfcAudioVisualApplianceType
• IfcAxis1Placement
• IfcAxis2Placement2D
• IfcAxis2Placement3D
• IfcBeam
• IfcBeamStandardCase
• IfcBeamType
• IfcBlobTexture
• IfcBlock
• IfcBoiler
• IfcBoilerType
• IfcBooleanClippingResult
• IfcBooleanResult
• IfcBoundaryCondition
• IfcBoundaryCurve
• IfcBoundaryEdgeCondition
• IfcBoundaryFaceCondition
• IfcBoundaryNodeCondition
• IfcBoundaryNodeConditionWarping
• IfcBoundedCurve
• IfcBoundedSurface
• IfcBoundingBox
• IfcBoxedHalfSpace
• IfcBSplineCurve
• IfcBSplineCurveWithKnots
• IfcBSplineSurface
• IfcBSplineSurfaceWithKnots
• IfcBuilding
• IfcBuildingElement
• IfcBuildingElementPart
• IfcBuildingElementPartType
• IfcBuildingElementProxy
• IfcBuildingElementProxyType
• IfcBuildingElementType
• IfcBuildingStorey
• IfcBuildingSystem
• IfcBurner
• IfcBurnerType
• IfcCableCarrierFitting
• IfcCableCarrierFittingType
• IfcCableCarrierSegment
• IfcCableCarrierSegmentType
• IfcCableFitting
• IfcCableFittingType
• IfcCableSegment
• IfcCableSegmentType
• IfcCartesianPoint
• IfcCartesianPointList
• IfcCartesianPointList2D
• IfcCartesianPointList3D
• IfcCartesianTransformationOperator
• IfcCartesianTransformationOperator2D
• IfcCartesianTransformationOperator2DnonUniform
• IfcCartesianTransformationOperator3D
• IfcCartesianTransformationOperator3DnonUniform
• IfcCenterLineProfileDef
• IfcChiller
• IfcChillerType
• IfcChimney
• IfcChimneyType
• IfcCircle
• IfcCircleHollowProfileDef
• IfcCircleProfileDef
• IfcCircularArcSegment2D
• IfcCivilElement
• IfcCivilElementType
• IfcClassification
• IfcClassificationReference
• IfcClosedShell
• IfcCoil
• IfcCoilType
• IfcColourRgb
• IfcColourRgbList
• IfcColourSpecification
• IfcColumn
• IfcColumnStandardCase
• IfcColumnType
• IfcCommunicationsAppliance
• IfcCommunicationsApplianceType
• IfcComplexProperty
• IfcComplexPropertyTemplate
• IfcCompositeCurve
• IfcCompositeCurveOnSurface
• IfcCompositeCurveSegment
• IfcCompositeProfileDef
• IfcCompressor
• IfcCompressorType
• IfcCondenser
• IfcCondenserType
• IfcConic
• IfcConnectedFaceSet
• IfcConnectionCurveGeometry
• IfcConnectionGeometry
• IfcConnectionPointEccentricity
• IfcConnectionPointGeometry
• IfcConnectionSurfaceGeometry
• IfcConnectionVolumeGeometry
• IfcConstraint
• IfcConstructionEquipmentResource
• IfcConstructionEquipmentResourceType
• IfcConstructionMaterialResource
• IfcConstructionMaterialResourceType
• IfcConstructionProductResource
• IfcConstructionProductResourceType
• IfcConstructionResource
• IfcConstructionResourceType
• IfcContext
• IfcContextDependentUnit
• IfcControl
• IfcController
• IfcControllerType
• IfcConversionBasedUnit
• IfcConversionBasedUnitWithOffset
• IfcCooledBeam
• IfcCooledBeamType
• IfcCoolingTower
• IfcCoolingTowerType
• IfcCoordinateOperation
• IfcCoordinateReferenceSystem
• IfcCostItem
• IfcCostSchedule
• IfcCostValue
• IfcCovering
• IfcCoveringType
• IfcCrewResource
• IfcCrewResourceType
• IfcCsgPrimitive3D
• IfcCsgSolid
• IfcCShapeProfileDef
• IfcCurrencyRelationship
• IfcCurtainWall
• IfcCurtainWallType
• IfcCurve
• IfcCurveBoundedPlane
• IfcCurveBoundedSurface
• IfcCurveSegment2D
• IfcCurveStyle
• IfcCurveStyleFont
• IfcCurveStyleFontAndScaling
• IfcCurveStyleFontPattern
• IfcCylindricalSurface
• IfcDamper
• IfcDamperType
• IfcDerivedProfileDef
• IfcDerivedUnit
• IfcDerivedUnitElement
• IfcDimensionalExponents
• IfcDirection
• IfcDiscreteAccessory
• IfcDiscreteAccessoryType
• IfcDistanceExpression
• IfcDistributionChamberElement
• IfcDistributionChamberElementType
• IfcDistributionCircuit
• IfcDistributionControlElement
• IfcDistributionControlElementType
• IfcDistributionElement
• IfcDistributionElementType
• IfcDistributionFlowElement
• IfcDistributionFlowElementType
• IfcDistributionPort
• IfcDistributionSystem
• IfcDocumentInformation
• IfcDocumentInformationRelationship
• IfcDocumentReference
• IfcDoor
• IfcDoorLiningProperties
• IfcDoorPanelProperties
• IfcDoorStandardCase
• IfcDoorStyle
• IfcDoorType
• IfcDraughtingPreDefinedColour
• IfcDraughtingPreDefinedCurveFont
• IfcDuctFitting
• IfcDuctFittingType
• IfcDuctSegment
• IfcDuctSegmentType
• IfcDuctSilencer
• IfcDuctSilencerType
• IfcEdge
• IfcEdgeCurve
• IfcEdgeLoop
• IfcElectricAppliance
• IfcElectricApplianceType
• IfcElectricDistributionBoard
• IfcElectricDistributionBoardType
• IfcElectricFlowStorageDevice
• IfcElectricFlowStorageDeviceType
• IfcElectricGenerator
• IfcElectricGeneratorType
• IfcElectricMotor
• IfcElectricMotorType
• IfcElectricTimeControl
• IfcElectricTimeControlType
• IfcElement
• IfcElementarySurface
• IfcElementAssembly
• IfcElementAssemblyType
• IfcElementComponent
• IfcElementComponentType
• IfcElementQuantity
• IfcElementType
• IfcEllipse
• IfcEllipseProfileDef
• IfcEnergyConversionDevice
• IfcEnergyConversionDeviceType
• IfcEngine
• IfcEngineType
• IfcEvaporativeCooler
• IfcEvaporativeCoolerType
• IfcEvaporator
• IfcEvaporatorType
• IfcEvent
• IfcEventTime
• IfcEventType
• IfcExtendedProperties
• IfcExternalInformation
• IfcExternallyDefinedHatchStyle
• IfcExternallyDefinedSurfaceStyle
• IfcExternallyDefinedTextFont
• IfcExternalReference
• IfcExternalReferenceRelationship
• IfcExternalSpatialElement
• IfcExternalSpatialStructureElement
• IfcExtrudedAreaSolid
• IfcExtrudedAreaSolidTapered
• IfcFace
• IfcFaceBasedSurfaceModel
• IfcFaceBound
• IfcFaceOuterBound
• IfcFaceSurface
• IfcFacetedBrep
• IfcFacetedBrepWithVoids
• IfcFailureConnectionCondition
• IfcFan
• IfcFanType
• IfcFastener
• IfcFastenerType
• IfcFeatureElement
• IfcFeatureElementAddition
• IfcFeatureElementSubtraction
• IfcFillAreaStyle
• IfcFillAreaStyleHatching
• IfcFillAreaStyleTiles
• IfcFilter
• IfcFilterType
• IfcFireSuppressionTerminal
• IfcFireSuppressionTerminalType
• IfcFixedReferenceSweptAreaSolid
• IfcFlowController
• IfcFlowControllerType
• IfcFlowFitting
• IfcFlowFittingType
• IfcFlowInstrument
• IfcFlowInstrumentType
• IfcFlowMeter
• IfcFlowMeterType
• IfcFlowMovingDevice
• IfcFlowMovingDeviceType
• IfcFlowSegment
• IfcFlowSegmentType
• IfcFlowStorageDevice
• IfcFlowStorageDeviceType
• IfcFlowTerminal
• IfcFlowTerminalType
• IfcFlowTreatmentDevice
• IfcFlowTreatmentDeviceType
• IfcFooting
• IfcFootingType
• IfcFurnishingElement
• IfcFurnishingElementType
• IfcFurniture
• IfcFurnitureType
• IfcGeographicElement
• IfcGeographicElementType
• IfcGeometricCurveSet
• IfcGeometricRepresentationContext
• IfcGeometricRepresentationItem
• IfcGeometricRepresentationSubContext
• IfcGeometricSet
• IfcGrid
• IfcGridAxis
• IfcGridPlacement
• IfcGroup
• IfcHalfSpaceSolid
• IfcHeatExchanger
• IfcHeatExchangerType
• IfcHumidifier
• IfcHumidifierType
• IfcImageTexture
• IfcIndexedColourMap
• IfcIndexedPolyCurve
• IfcIndexedPolygonalFace
• IfcIndexedPolygonalFaceWithVoids
• IfcIndexedTextureMap
• IfcIndexedTriangleTextureMap
• IfcInterceptor
• IfcInterceptorType
• IfcIntersectionCurve
• IfcInventory
• IfcIrregularTimeSeries
• IfcIrregularTimeSeriesValue
• IfcIShapeProfileDef
• IfcJunctionBox
• IfcJunctionBoxType
• IfcLaborResource
• IfcLaborResourceType
• IfcLagTime
• IfcLamp
• IfcLampType
• IfcLibraryInformation
• IfcLibraryReference
• IfcLightDistributionData
• IfcLightFixture
• IfcLightFixtureType
• IfcLightIntensityDistribution
• IfcLightSource
• IfcLightSourceAmbient
• IfcLightSourceDirectional
• IfcLightSourceGoniometric
• IfcLightSourcePositional
• IfcLightSourceSpot
• IfcLine
• IfcLinearPlacement
• IfcLinearPositioningElement
• IfcLineSegment2D
• IfcLocalPlacement
• IfcLoop
• IfcLShapeProfileDef
• IfcManifoldSolidBrep
• IfcMapConversion
• IfcMappedItem
• IfcMaterial
• IfcMaterialClassificationRelationship
• IfcMaterialConstituent
• IfcMaterialConstituentSet
• IfcMaterialDefinition
• IfcMaterialDefinitionRepresentation
• IfcMaterialLayer
• IfcMaterialLayerSet
• IfcMaterialLayerSetUsage
• IfcMaterialLayerWithOffsets
• IfcMaterialList
• IfcMaterialProfile
• IfcMaterialProfileSet
• IfcMaterialProfileSetUsage
• IfcMaterialProfileSetUsageTapering
• IfcMaterialProfileWithOffsets
• IfcMaterialProperties
• IfcMaterialRelationship
• IfcMaterialUsageDefinition
• IfcMeasureWithUnit
• IfcMechanicalFastener
• IfcMechanicalFastenerType
• IfcMedicalDevice
• IfcMedicalDeviceType
• IfcMember
• IfcMemberStandardCase
• IfcMemberType
• IfcMetric
• IfcMirroredProfileDef
• IfcMonetaryUnit
• IfcMotorConnection
• IfcMotorConnectionType
• IfcNamedUnit
• IfcObject
• IfcObjectDefinition
• IfcObjective
• IfcObjectPlacement
• IfcOccupant
• IfcOffsetCurve
• IfcOffsetCurve2D
• IfcOffsetCurve3D
• IfcOffsetCurveByDistances
• IfcOpeningElement
• IfcOpeningStandardCase
• IfcOpenShell
• IfcOrganization
• IfcOrganizationRelationship
• IfcOrientationExpression
• IfcOrientedEdge
• IfcOuterBoundaryCurve
• IfcOutlet
• IfcOutletType
• IfcOwnerHistory
• IfcParameterizedProfileDef
• IfcPath
• IfcPcurve
• IfcPerformanceHistory
• IfcPermeableCoveringProperties
• IfcPermit
• IfcPerson
• IfcPersonAndOrganization
• IfcPhysicalComplexQuantity
• IfcPhysicalQuantity
• IfcPhysicalSimpleQuantity
• IfcPile
• IfcPileType
• IfcPipeFitting
• IfcPipeFittingType
• IfcPipeSegment
• IfcPipeSegmentType
• IfcPixelTexture
• IfcPlacement
• IfcPlanarBox
• IfcPlanarExtent
• IfcPlane
• IfcPlate
• IfcPlateStandardCase
• IfcPlateType
• IfcPoint
• IfcPointOnCurve
• IfcPointOnSurface
• IfcPolygonalBoundedHalfSpace
• IfcPolygonalFaceSet
• IfcPolyline
• IfcPolyLoop
• IfcPort
• IfcPositioningElement
• IfcPostalAddress
• IfcPreDefinedColour
• IfcPreDefinedCurveFont
• IfcPreDefinedItem
• IfcPreDefinedProperties
• IfcPreDefinedPropertySet
• IfcPreDefinedTextFont
• IfcPresentationItem
• IfcPresentationLayerAssignment
• IfcPresentationLayerWithStyle
• IfcPresentationStyle
• IfcPresentationStyleAssignment
• IfcProcedure
• IfcProcedureType
• IfcProcess
• IfcProduct
• IfcProductDefinitionShape
• IfcProductRepresentation
• IfcProfileDef
• IfcProfileProperties
• IfcProject
• IfcProjectedCRS
• IfcProjectionElement
• IfcProjectLibrary
• IfcProjectOrder
• IfcProperty
• IfcPropertyAbstraction
• IfcPropertyBoundedValue
• IfcPropertyDefinition
• IfcPropertyDependencyRelationship
• IfcPropertyEnumeratedValue
• IfcPropertyEnumeration
• IfcPropertyListValue
• IfcPropertyReferenceValue
• IfcPropertySet
• IfcPropertySetDefinition
• IfcPropertySetTemplate
• IfcPropertySingleValue
• IfcPropertyTableValue
• IfcPropertyTemplate
• IfcPropertyTemplateDefinition
• IfcProtectiveDevice
• IfcProtectiveDeviceTrippingUnit
• IfcProtectiveDeviceTrippingUnitType
• IfcProtectiveDeviceType
• IfcProxy
• IfcPump
• IfcPumpType
• IfcQuantityArea
• IfcQuantityCount
• IfcQuantityLength
• IfcQuantitySet
• IfcQuantityTime
• IfcQuantityVolume
• IfcQuantityWeight
• IfcRailing
• IfcRailingType
• IfcRamp
• IfcRampFlight
• IfcRampFlightType
• IfcRampType
• IfcRationalBSplineCurveWithKnots
• IfcRationalBSplineSurfaceWithKnots
• IfcRectangleHollowProfileDef
• IfcRectangleProfileDef
• IfcRectangularPyramid
• IfcRectangularTrimmedSurface
• IfcRecurrencePattern
• IfcReference
• IfcReferent
• IfcRegularTimeSeries
• IfcReinforcementBarProperties
• IfcReinforcementDefinitionProperties
• IfcReinforcingBar
• IfcReinforcingBarType
• IfcReinforcingElement
• IfcReinforcingElementType
• IfcReinforcingMesh
• IfcReinforcingMeshType
• IfcRelAggregates
• IfcRelAssigns
• IfcRelAssignsToActor
• IfcRelAssignsToControl
• IfcRelAssignsToGroup
• IfcRelAssignsToGroupByFactor
• IfcRelAssignsToProcess
• IfcRelAssignsToProduct
• IfcRelAssignsToResource
• IfcRelAssociates
• IfcRelAssociatesApproval
• IfcRelAssociatesClassification
• IfcRelAssociatesConstraint
• IfcRelAssociatesDocument
• IfcRelAssociatesLibrary
• IfcRelAssociatesMaterial
• IfcRelationship
• 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
• IfcReparametrisedCompositeCurveSegment
• IfcRepresentation
• IfcRepresentationContext
• IfcRepresentationItem
• IfcRepresentationMap
• IfcResource
• IfcResourceApprovalRelationship
• IfcResourceConstraintRelationship
• IfcResourceLevelRelationship
• IfcResourceTime
• IfcRevolvedAreaSolid
• IfcRevolvedAreaSolidTapered
• IfcRightCircularCone
• IfcRightCircularCylinder
• IfcRoof
• IfcRoofType
• IfcRoot
• IfcRoundedRectangleProfileDef
• IfcSanitaryTerminal
• IfcSanitaryTerminalType
• IfcSchedulingTime
• IfcSeamCurve
• IfcSectionedSolid
• IfcSectionedSolidHorizontal
• IfcSectionedSpine
• IfcSectionProperties
• IfcSectionReinforcementProperties
• IfcSensor
• IfcSensorType
• IfcShadingDevice
• IfcShadingDeviceType
• IfcShapeAspect
• IfcShapeModel
• IfcShapeRepresentation
• IfcShellBasedSurfaceModel
• IfcSimpleProperty
• IfcSimplePropertyTemplate
• IfcSite
• IfcSIUnit
• IfcSlab
• IfcSlabElementedCase
• IfcSlabStandardCase
• IfcSlabType
• IfcSlippageConnectionCondition
• IfcSolarDevice
• IfcSolarDeviceType
• IfcSolidModel
• IfcSpace
• IfcSpaceHeater
• IfcSpaceHeaterType
• IfcSpaceType
• IfcSpatialElement
• IfcSpatialElementType
• IfcSpatialStructureElement
• IfcSpatialStructureElementType
• IfcSpatialZone
• IfcSpatialZoneType
• IfcSphere
• IfcSphericalSurface
• IfcStackTerminal
• IfcStackTerminalType
• IfcStair
• IfcStairFlight
• IfcStairFlightType
• IfcStairType
• IfcStructuralAction
• IfcStructuralActivity
• IfcStructuralAnalysisModel
• IfcStructuralConnection
• IfcStructuralConnectionCondition
• IfcStructuralCurveAction
• IfcStructuralCurveConnection
• IfcStructuralCurveMember
• IfcStructuralCurveMemberVarying
• IfcStructuralCurveReaction
• IfcStructuralItem
• IfcStructuralLinearAction
• IfcStructuralLoad
• IfcStructuralLoadCase
• IfcStructuralLoadConfiguration
• IfcStructuralLoadGroup
• IfcStructuralLoadLinearForce
• IfcStructuralLoadOrResult
• IfcStructuralLoadPlanarForce
• IfcStructuralLoadSingleDisplacement
• IfcStructuralLoadSingleDisplacementDistortion
• IfcStructuralLoadSingleForce
• IfcStructuralLoadSingleForceWarping
• IfcStructuralLoadStatic
• IfcStructuralLoadTemperature
• IfcStructuralMember
• IfcStructuralPlanarAction
• IfcStructuralPointAction
• IfcStructuralPointConnection
• IfcStructuralPointReaction
• IfcStructuralReaction
• IfcStructuralResultGroup
• IfcStructuralSurfaceAction
• IfcStructuralSurfaceConnection
• IfcStructuralSurfaceMember
• IfcStructuralSurfaceMemberVarying
• IfcStructuralSurfaceReaction
• IfcStyledItem
• IfcStyledRepresentation
• IfcStyleModel
• IfcSubContractResource
• IfcSubContractResourceType
• IfcSubedge
• IfcSurface
• IfcSurfaceCurve
• IfcSurfaceCurveSweptAreaSolid
• IfcSurfaceFeature
• IfcSurfaceOfLinearExtrusion
• IfcSurfaceOfRevolution
• IfcSurfaceReinforcementArea
• IfcSurfaceStyle
• IfcSurfaceStyleLighting
• IfcSurfaceStyleRefraction
• IfcSurfaceStyleRendering
• IfcSurfaceStyleShading
• IfcSurfaceStyleWithTextures
• IfcSurfaceTexture
• IfcSweptAreaSolid
• IfcSweptDiskSolid
• IfcSweptDiskSolidPolygonal
• IfcSweptSurface
• IfcSwitchingDevice
• IfcSwitchingDeviceType
• IfcSystem
• IfcSystemFurnitureElement
• IfcSystemFurnitureElementType
• IfcTable
• IfcTableColumn
• IfcTableRow
• IfcTank
• IfcTankType
• IfcTask
• IfcTaskTime
• IfcTaskTimeRecurring
• IfcTaskType
• IfcTelecomAddress
• IfcTendon
• IfcTendonAnchor
• IfcTendonAnchorType
• IfcTendonType
• IfcTessellatedFaceSet
• IfcTessellatedItem
• IfcTextLiteral
• IfcTextLiteralWithExtent
• IfcTextStyle
• IfcTextStyleFontModel
• IfcTextStyleForDefinedFont
• IfcTextStyleTextModel
• IfcTextureCoordinate
• IfcTextureCoordinateGenerator
• IfcTextureMap
• IfcTextureVertex
• IfcTextureVertexList
• IfcTimePeriod
• IfcTimeSeries
• IfcTimeSeriesValue
• IfcTopologicalRepresentationItem
• IfcTopologyRepresentation
• IfcToroidalSurface
• IfcTransformer
• IfcTransformerType
• IfcTransitionCurveSegment2D
• IfcTransportElement
• IfcTransportElementType
• IfcTrapeziumProfileDef
• IfcTriangulatedFaceSet
• IfcTriangulatedIrregularNetwork
• IfcTrimmedCurve
• IfcTShapeProfileDef
• IfcTubeBundle
• IfcTubeBundleType
• IfcTypeObject
• IfcTypeProcess
• IfcTypeProduct
• IfcTypeResource
• IfcUnitaryControlElement
• IfcUnitaryControlElementType
• IfcUnitaryEquipment
• IfcUnitaryEquipmentType
• IfcUnitAssignment
• IfcUShapeProfileDef
• IfcValve
• IfcValveType
• IfcVector
• IfcVertex
• IfcVertexLoop
• IfcVertexPoint
• IfcVibrationIsolator
• IfcVibrationIsolatorType
• IfcVirtualElement
• IfcVirtualGridIntersection
• IfcVoidingFeature
• IfcWall
• IfcWallElementedCase
• IfcWallStandardCase
• IfcWallType
• IfcWasteTerminal
• IfcWasteTerminalType
• IfcWindow
• IfcWindowLiningProperties
• IfcWindowPanelProperties
• IfcWindowStandardCase
• IfcWindowStyle
• IfcWindowType
• IfcWorkCalendar
• IfcWorkControl
• IfcWorkPlan
• IfcWorkSchedule
• IfcWorkTime
• IfcZone
• IfcZShapeProfileDef

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