• IfcActorResource
• IfcClassificationResource
• IfcDocumentResource
• IfcCostResource
• IfcDateTimeResource
• IfcGeometryResource
• IfcMeasureResource
• IfcMaterialResource
• IfcPropertyResource
• IfcRepresentationResource
• IfcUtilityResource
• IfcPropertyResource_R151

• IfcKernel
• IfcModelingAidExtension
• IfcProcessExtension
• IfcProductExtension
• IfcControlExtension
• IfcProjectMgmtExtension

• IfcSharedBldgElements
• IfcSharedBldgServiceElements
• IfcSharedSpatialElements

• IfcArchitectureDomain
• IfcConstructionMgmtDomain
• IfcFacilitiesMgmtDomain
• IfcHvacDomain

IfcActorResource

Select Types

• No changes

Enumerations

• IfcRoleEnum (New)

Class Definitions

• IfcActorRole (Change)
• IfcAddress (Change)
• IfcOrganization (Change)
• IfcPerson (Change)
• IfcPersonAndOrganization (Change)

IfcClassificationResource

Class Definitions

• IfcClassification (Change)
• IfcClassificationList (Change)
• IfcClassificationNotation (Change)
• IfcNotationFacet (Change)

IfcDocumentResource

Class Definitions

• IfcDocumentReference (New)
• IfcDocumentType (New)

IfcCostResource

Enumerations

• IfcCostEnum (New)

Class Definitions

• IfcCost (Change)
• IfcCostModifier (Change)

IfcDateTimeResource

Simple Types

• IfcDayInMonthNumber (Change)
• IfcDaylightSavingNumber (Change)
• IfcHourInDay (Change)
• IfcMinuteInHour (Change)
• IfcMonthInYearNumber (Change)
• IfcSecondInMinute (Change)
• IfcYearNumber (Change)

Select Types

• No changes

Enumerations

• IfcAheadOrBehind (New)

Class Definitions

• IfcCalendarDate (Change)
• IfcCoordinatedUniversalTimeOffset (Change)
• IfcDateAndTime (Change)
• IfcLocalTime (Change)

IfcGeometryResource

Simple Types

• No changes

Select Types

• No changes

Enumerations

• No changes

Class Definitions

• IfcCurve (Change)
• IfcEdge (New)
• IfcOrientedEdge (New)
• IfcPath (New)
• IfcVertex (New)
• IfcBoundedCurve (Change)
• IfcConic (Change)
• IfcLine (Change)

IfcMeasureResource

Simple Types

• IfcAngularVelocityMeasure (New)
• IfcDynamicViscosityMeasure (New)
• IfcElectricVoltageMeasure (New)
• IfcEnergyMeasure (New)
• IfcFrequencyMeasure (New)
• IfcHeatFluxDensityMeasure (New)
• IfcIntegerCountRateMeasure (New)
• IfcKinematicViscosityMeasure (New)
• IfcLinearVelocityMeasure (New)
• IfcMassDensityMeasure (New)
• IfcMassFlowRateMeasure (New)
• IfcMonetaryMeasure (New)
• IfcPowerMeasure (New)
• IfcPressureMeasure (New)
• IfcThermalAdmittanceMeasure (New)
• IfcThermalResistanceMeasure (New)
• IfcThermalTransmittanceMeasure (New)
• IfcVolumetricFlowrateMeasure (New)
• IfcCompoundPlaneAngleMeasure (Change)
• IfcTimeDurationMeasure (Deleted)

Select Types

• IfcMeasureValue (Change)

Enumerations

• IfcCurrencyEnum (New)
• IfcDerivedUnitEnum (New)
• IfcUnitEnum (New)
• IfcDerivedUnitTypeEnum (Deleted)
• IfcUnitTypeEnum (Deleted)

Class Definitions

• IfcDerivedUnit (Change)
• IfcNamedUnit (Change)

IfcMaterialResource

Select Types

• IfcMaterialPropertySelect (New)
• IfcMaterialSelect (Change)

Class Definitions

• IfcMaterial (Change)
• IfcMaterialFinish (New)
• IfcMaterialLayer (Change)
• IfcMaterialLayerSet (Change)
• IfcMaterialLayerSetUsage (Change)
• IfcMaterialList (Change)

IfcPropertyResource

Select Types

• IfcObjectReferenceSelect (New)

Class Definitions

• IfcEnumeratedProperty (New)
• IfcEnumeration (New)
• IfcLibrary (New)
• IfcLibraryReference (New)
• IfcObjectReference (Change)
• IfcProperty (Change)
• IfcPropertyList (New)
• IfcSimplePropertyWithUnit (Change)
• IfcOccurrencePropertySet (Deleted)
• IfcPropertySet (Change)
• IfcPropertyTypeDef (Deleted)
• IfcRepresentationContext (Change)
• IfcShapeAspect (Change)
• IfcShapeRepresentation (Change)
• IfcSharedPropertySet (Deleted)
• IfcSimpleProperty (Change)

IfcRepresentationResource

Class Definitions

• IfcGeometricRepresentationContext (New)
• IfcProductDefinitionShape (Change)
• IfcProductDefinitionTopology (New)
• IfcProductRepresentation (New)
• IfcRepresentation (New)
• IfcRepresentationContext (Change)
• IfcShapeAspect (Change)
• IfcShapeRepresentation (Change)
• IfcTopologyRepresentation (New)

IfcUtilityResource

Simple Types

• IfcModifiedFlag (New)

Class Definitions

• IfcApplication (New)
• IfcAuditTrail (Change)
• IfcOwnerHistory (Change)
• IfcTable (Change)
• IfcTransaction (Change)
• IfcProjectAppRegistry (Deleted)
• IfcProjectTeamRegistry (Deleted)
• IfcRegisteredApplication (Deleted)

IfcPropertyResource_R151

IfcKernel

Select Types

• No changes

Enumerations

• IfcContainedOrReferencedEnum (New)
• IfcContainmentEnum (Change)
• IfcProxyEnum (Change)
• IfcResourceConsumptionEnum (New)
• IfcSequenceEnum (Change)
• IfcResourceTypeEnum (Deleted)

Class Definitions

• IfcActor (New)
• IfcControl (Change)
• IfcExtensionPropertySet (New)
• IfcGroup (Change)
• IfcObject (Change)
• IfcProcess (Change)
• IfcProduct (Change)
• IfcProject (Change)
• IfcPropertyDefinition (New)
• IfcPropertySet (Change)
• IfcProxy (Change)
• IfcRelActsUpon (New)
• IfcRelAssignsProperties (New)
• IfcRelAssignsTypedProperties (New)
• IfcRelContains (Change)
• IfcRelControls (New)
• IfcRelNests (Change)
• IfcRelProcessOperatesOn (Change)
• IfcRelSequence (Change)
• IfcResource (Change)
• IfcRoot (Change)
• IfcDocument (Deleted)
• IfcRelUsesResource (Change)
• IfcRelationship (Change)

IfcModelingAidExtension

Select Types

• No changes

Class Definitions

• IfcDesignGrid (Change)
• IfcGridAxis (Change)
• IfcGridLevel (Change)
• IfcLightSource (New)
• IfcPhotometricOutputSpace (New)

IfcProcessExtension

Enumerations

• IfcMultiplierOrDivider (New)
• IfcWorkPlanPurposeEnum (New)
• IfcWorkTaskMilestoneEnum (New)
• IfcWorkTaskStatusEnum (Change)

Class Definitions

• IfcRelNestsProcesses (Change)
• IfcRelNestsWorkScheduleElements (New)
• IfcRelNestsWorkSchedules (New)
• IfcRelUsesResource (Change)
• IfcScheduleTimeControl (New)
• IfcWorkPlan (New)
• IfcWorkSchedule (Change)
• IfcWorkScheduleElement (New)
• IfcWorkTask (Change)

IfcProductExtension

Enumerations

• IfcConnectionEnum (Change)
• IfcElectricCurrentEnum (New)
• IfcInternalOrExternalEnum (New)
• IfcPhysicalOrVirtualEnum (New)
• IfcBuildingStoreyTypeEnum (Deleted)
• IfcBuildingTypeEnum (Deleted)
• IfcOpeningTypeEnum (Deleted)
• IfcSiteTypeEnum (Deleted)
• IfcSpaceTypeEnum (Deleted)
• IfcSystemTypeEnum (Deleted)
• IfcZoneTypeEnum (Deleted)

Class Definitions

• IfcBuilding (Change)
• IfcBuildingStorey (Change)
• IfcElectricalCharacteristics (New)
• IfcManufactureInformation (New)
• IfcOpeningElement (Change)
• IfcRelConnectsPathElements (Change)
• IfcSite (Change)
• IfcSpace (Change)
• IfcSpaceBoundary (Change)
• IfcSystem (Change)
• IfcZone (Change)

IfcControlExtension

Select Types

• IfcMetricValueSelect (New)

Enumerations

• IfcAggregatorEnum (New)
• IfcApprovalStatusEnum (New)
• IfcBenchmarkEnum (New)
• IfcConstraintEnum (New)
• IfcConstraintRelationshipEnum (New)
• IfcElementConditionEnum (New)
• IfcMaintenanceTypeEnum (New)
• IfcMetricDataEnum (New)
• IfcObjectiveEnum (New)

Class Definitions

• IfcApproval (New)
• IfcConstraint (New)
• IfcMaintenanceRecord (New)
• IfcMaintenanceType (New)
• IfcMetric (New)
• IfcMetricBenchmark (New)
• IfcMetricValue (New)
• IfcObjective (New)
• IfcRelAggregatesConstraints (New)
• IfcRelAssignsApprovals (New)
• IfcRelControlsMaintenance (New)
• IfcRelRelatesConstraints (New)

IfcProjectMgmtExtension

Enumerations

• IfcChangeOrderStatusEnum (New)
• IfcCostUseEnum (New)
• IfcPurchaseOrderStatusEnum (New)
• IfcWorkOrderStatusEnum (New)

Class Definitions

• IfcBudget (New)
• IfcChangeOrder (New)
• IfcCostElement (Change)
• IfcCostSchedule (Change)
• IfcProjectOrder (New)
• IfcPurchaseOrder (New)
• IfcRelCostsObjects (New)
• IfcRelNestsCostElements (Change)
• IfcRelNestsCostSchedules (New)
• IfcWorkOrder (New)

IfcSharedBldgElements

Enumerations

• IfcCoveringTypeEnum (Change)
• IfcDoorPanelTypeEnum (New)
• IfcJointEnum (New)
• IfcPermeableCoveringTypeEnum (New)
• IfcSlabTypeEnum (Change)
• IfcWindowPanelOperationEnum (New)
• IfcWindowPanelTypeEnum (New)
• IfcBeamTypeEnum (Deleted)
• IfcBuiltInTypeEnum (Deleted)
• IfcColumnTypeEnum (Deleted)
• IfcDoorTypeEnum (Deleted)
• IfcFloorTypeEnum (Deleted)
• IfcWallTypeEnum (Deleted)
• IfcWindowTypeEnum (Deleted)

Class Definitions

• IfcCovering (Change)
• IfcCurtainWall (New)
• IfcDoorLining (New)
• IfcDoorPanel (New)
• IfcPermeableCovering (New)
• IfcRelAttachesToBoundaries (New)
• IfcRelJoinsElements (New)
• IfcRoof (New)
• IfcSlab (Change)
• IfcWindowLining (New)
• IfcWindowPanel (New)
• IfcBeam (Change)
• IfcBuiltIn (Change)
• IfcColumn (Change)
• IfcDoor (Change)
• IfcFloor (Deleted)
• IfcWall (Change)
• IfcWindow (Change)

IfcSharedBldgServiceElements

Enumerations

• IfcDiscreteElementTypeEnum (Change)
• IfcDistributionFlowElementTypeEnum (New)
• IfcDistributionPortTypeEnum (New)
• IfcElectricalApplianceTypeEnum (Change)
• IfcElectricalFixtureTypeEnum (New)
• IfcEquipmentTypeEnum (Change)
• IfcFlowDirectionEnum (New)
• IfcFlowEquipmentTypeEnum (New)
• IfcFlowFittingTypeEnum (New)
• IfcFlowSegmentTypeEnum (New)
• IfcFlowTerminalTypeEnum (New)
• IfcPlumbingFixtureTypeEnum (New)
• IfcPrimaryFittingEnum (New)
• IfcDistributionElementTypeEnum (Deleted)
• IfcFixtureTypeEnum (Deleted)

Class Definitions

• IfcDiscreteElement (Change)
• IfcDistributionControlElement (New)
• IfcDistributionElement (Change)
• IfcDistributionFlowElement (New)
• IfcDistributionPortGeometry (New)
• IfcElectricalAppliance (Change)
• IfcElectricalFixture (New)
• IfcEquipment (Change)
• IfcFlowController (New)
• IfcFlowEquipment (New)
• IfcFlowFitting (New)
• IfcFlowSegment (New)
• IfcFlowTerminal (New)
• IfcLightFixture (New)
• IfcPlumbingFixture (New)
• IfcRelAttachesElements (New)
• IfcRelConnectsPorts (New)
• IfcFixture (Deleted)

IfcSharedSpatialElements

Enumerations

• IfcLossOrGainEnum (New)
• IfcOccupantTypeEnum (New)
• IfcRequirementOrCriteriaEnum (New)
• IfcResidentEnum (New)
• IfcUseCaseSourceEnum (New)
• IfcVisitorEnum (New)

Class Definitions

• IfcFireCompartment (New)
• IfcOccupancyNumber (New)
• IfcOccupant (New)
• IfcRelOccupiesSpaces (New)
• IfcSpaceUseCase (New)

IfcArchitectureDomain

Enumerations

• IfcBuiltInAccessoryTypeEnum (New)
• IfcCabinetTypeEnum (New)
• IfcCounterOrShelfTypeEnum (New)
• IfcRailingTypeEnum (New)
• IfcRampTypeEnum (New)
• IfcSpaceProgramTypeEnum (Change)
• IfcStairTypeEnum (New)
• IfcVisualScreenTypeEnum (New)

Class Definitions

• IfcBuiltInAccessory (New)
• IfcCabinet (New)
• IfcCounterOrShelf (New)
• IfcLanding (New)
• IfcRailing (New)
• IfcRamp (New)
• IfcRampFlight (New)
• IfcRelAdjacencyReq (Change)
• IfcSpaceProgram (Change)
• IfcSpaceProgramGroup (Change)
• IfcStair (New)
• IfcStairFlight (New)
• IfcVisualScreen (New)

IfcConstructionMgmtDomain

Class Definitions

• IfcCMDocPackage (New)
• IfcConstructionEquipmentResource (New)
• IfcConstructionMaterialResource (New)
• IfcConstructionZoneAggregationProduct (New)
• IfcCrewResource (New)
• IfcLaborResource (New)
• IfcProductResource (New)
• IfcRelAggregatesCrewResources (New)
• IfcSubcontractResource (New)

IfcFacilitiesMgmtDomain

Enumerations

• IfcFurnitureElementTypeEnum (New)
• IfcFurnitureTypeEnum (Change)
• IfcInventoryTypeEnum (New)
• IfcOccupancyMoveTypeEnum (New)
• IfcWorkstationEnum (New)

Class Definitions

• IfcFurniture (Change)
• IfcFurnitureModel (New)
• IfcInventory (New)
• IfcOccupancySchedule (New)
• IfcOccupancyScheduleElement (New)
• IfcOccupancyTask (New)
• IfcRelNestsOccupancyScheduleElements (New)
• IfcRelNestsOccupancySchedules (New)
• IfcRelWorkInteraction (New)
• IfcSystemFurnitureElement (New)
• IfcWorkstation (New)

IfcHvacDomain

Enumerations

• IfcActuatorFailPositionEnum (New)
• IfcActuatorTypeEnum (New)
• IfcAirTerminalBoxTypeEnum (New)
• IfcControllerTypeEnum (New)
• IfcDamperSizingMethodEnum (New)
• IfcDamperTypeEnum (New)
• IfcSensorTypeEnum (New)
• IfcValveEnum (New)

Class Definitions

• IfcActuator (New)
• IfcAirTerminalBox (New)
• IfcController (New)
• IfcDamper (New)
• IfcSensor (New)
• IfcValve (New)

Class IfcActorRole

Schema

Moved from IfcPropertyResource_R151 to IfcActorResource in R2.0 Final

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
Role	IfcRoleEnum	New attribute in R2.0 Final
Description	OPTIONAL STRING	No Change
Name	IfcRoleTypeEnum	Deleted

Class IfcAddress

Schema

Moved from IfcPropertyResource_R151 to IfcActorResource in R2.0 Final

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
InternalLocation	OPTIONAL STRING	No Change
AddressLines	LIST [0:?] OF STRING	No Change
Town	OPTIONAL STRING	No Change
Region	OPTIONAL STRING	No Change
PostalCode	OPTIONAL STRING	No Change
Country	OPTIONAL STRING	No Change
FacsimileNumbers	LIST [0:?] OF STRING	No Change
TelephoneNumbers	LIST [0:?] OF STRING	No Change
ElectronicMailAddresses	LIST [0:?] OF STRING	No Change
TelexNumber	OPTIONAL STRING	No Change
WWWHomePageURL	OPTIONAL STRING	New attribute in R2.0 Final
Description	OPTIONAL STRING	No Change
PostalBox	OPTIONAL STRING	New attribute in R2.0 Final
OfPerson	SET [0:?] OF IfcPerson	No Change
OfOrganization	SET [0:?] OF IfcOrganization	No Change
WWWHomePage	STRING	Deleted

Class IfcOrganization

Schema

Moved from IfcPropertyResource_R151 to IfcActorResource in R2.0 Final

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
Name	STRING	No Change
Addresses	LIST [0:?] OF IfcAddress	New attribute in R2.0 Final
Roles	LIST [0:?] OF IfcActorRole	No Change
Description	OPTIONAL STRING	No Change
Adresses	LIST [0:?] OF IfcAddress	Deleted

Class IfcPerson

Schema

Moved from IfcPropertyResource_R151 to IfcActorResource in R2.0 Final

Attributes and Relationships

No Changes

Class IfcPersonAndOrganization

Schema

Moved from IfcPropertyResource_R151 to IfcActorResource in R2.0 Final

Attributes and Relationships

No Changes

Class IfcClassification

Schema

Moved from IfcPropertyResource_R151 to IfcClassificationResource in R2.0 Final

Attributes and Relationships

No Changes

Class IfcClassificationList

Schema

Moved from IfcPropertyResource_R151 to IfcClassificationResource in R2.0 Final

Attributes and Relationships

No Changes

Class IfcClassificationNotation

Schema

Moved from IfcPropertyResource_R151 to IfcClassificationResource in R2.0 Final

Attributes and Relationships

No Changes

Class IfcNotationFacet

Schema

Moved from IfcPropertyResource_R151 to IfcClassificationResource in R2.0 Final

Attributes and Relationships

No Changes

Class IfcCost

Schema

Moved from IfcPropertyResource_R151 to IfcCostResource in R2.0 Final

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
CostType	IfcCostEnum	IfcCostTypeEnum
BaseCostValue	OPTIONAL IfcMonetaryMeasure	OPTIONAL REAL
FinalCostValue	OPTIONAL IfcMonetaryMeasure	OPTIONAL REAL
Currency	IfcCurrencyEnum	IfcCurrencyTypeEnum
ModifierBasis	OPTIONAL IfcModifierBasisEnum	No Change
ModifierValues	LIST [0:?] OF IfcCostModifier	New attribute in R2.0 Final
UnitCostBasis	IfcMeasureWithUnit	No Change
CostDate	OPTIONAL IfcDateTimeSelect	No Change
CostComponents	LIST [0:?] OF IfcCost	No Change
ComponentOf	SET [0:?] OF IfcCost	New attribute in R2.0 Final
CostModifiers	LIST [0:?] OF IfcCostModifier	Deleted

Class IfcCostModifier

Schema

Moved from IfcPropertyResource_R151 to IfcCostResource in R2.0 Final

Attributes and Relationships

No Changes

Type IfcDayInMonthNumber

Schema

Moved from IfcPropertyResource_R151 to IfcDateTimeResource in R2.0 Final

Type

R2.0 Final	Change from Release 1.5.1
INTEGER	No Change

Type IfcDaylightSavingNumber

Schema

Moved from IfcPropertyResource_R151 to IfcDateTimeResource in R2.0 Final

Type

R2.0 Final	Change from Release 1.5.1
INTEGER	No Change

Type IfcHourInDay

Schema

Moved from IfcPropertyResource_R151 to IfcDateTimeResource in R2.0 Final

Type

R2.0 Final	Change from Release 1.5.1
INTEGER	No Change

Type IfcMinuteInHour

Schema

Moved from IfcPropertyResource_R151 to IfcDateTimeResource in R2.0 Final

Type

R2.0 Final	Change from Release 1.5.1
INTEGER	No Change

Type IfcMonthInYearNumber

Schema

Moved from IfcPropertyResource_R151 to IfcDateTimeResource in R2.0 Final

Type

R2.0 Final	Change from Release 1.5.1
INTEGER	No Change

Type IfcSecondInMinute

Schema

Moved from IfcPropertyResource_R151 to IfcDateTimeResource in R2.0 Final

Type

R2.0 Final	Change from Release 1.5.1
REAL	No Change

Type IfcYearNumber

Schema

Moved from IfcPropertyResource_R151 to IfcDateTimeResource in R2.0 Final

Type

R2.0 Final	Change from Release 1.5.1
INTEGER	No Change

Class IfcCalendarDate

Schema

Moved from IfcPropertyResource_R151 to IfcDateTimeResource in R2.0 Final

Attributes and Relationships

No Changes

Class IfcCoordinatedUniversalTimeOffset

Schema

Moved from IfcPropertyResource_R151 to IfcDateTimeResource in R2.0 Final

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
HourOffset	IfcHourInDay	No Change
MinuteOffset	OPTIONAL IfcMinuteInHour	No Change
Sense	IfcAheadOrBehind	New attribute in R2.0 Final
Ahead	BOOLEAN	Deleted

Class IfcDateAndTime

Schema

Moved from IfcPropertyResource_R151 to IfcDateTimeResource in R2.0 Final

Attributes and Relationships

No Changes

Class IfcLocalTime

Schema

Moved from IfcPropertyResource_R151 to IfcDateTimeResource in R2.0 Final

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
HourComponent	IfcHourInDay	No Change
MinuteComponent	OPTIONAL IfcMinuteInHour	No Change
SecondComponent	OPTIONAL IfcSecondInMinute	No Change
Zone	OPTIONAL IfcCoordinatedUniversalTimeOffset	IfcCoordinatedUniversalTimeOffset
DaylightSavingOffset	OPTIONAL IfcDaylightSavingNumber	No Change

Class IfcBoundedCurve

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
Dim	IfcDimensionCount	Deleted

Class IfcConic

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
Position	IfcAxis2Placement	No Change
Dim	IfcDimensionCount	Deleted

Class IfcCurve

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
Dim	IfcDimensionCount	New attribute in R2.0 Final

Class IfcLine

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
Pnt	IfcCartesianPoint	No Change
Dir	IfcVector	No Change
Dim	IfcDimensionCount	Deleted

Type IfcCompoundPlaneAngleMeasure

Type

R2.0 Final	Change from Release 1.5.1
LIST [3:3] OF INTEGER	No Change

Type IfcMeasureValue

Select

R2.0 Final	Change from Release 1.5.1
IfcAmountOfSubstanceMeasure	No Change
IfcAngularVelocityMeasure	New in R2.0 Final
IfcAreaMeasure	No Change
IfcBoolean	No Change
IfcCompoundPlaneAngleMeasure	No Change
IfcContextDependentMeasure	No Change
IfcCountMeasure	No Change
IfcDescriptiveMeasure	No Change
IfcDynamicViscosityMeasure	New in R2.0 Final
IfcElectricCurrentMeasure	No Change
IfcElectricVoltageMeasure	New in R2.0 Final
IfcEnergyMeasure	New in R2.0 Final
IfcHeatFluxDensityMeasure	New in R2.0 Final
IfcInteger	No Change
IfcIntegerCountRateMeasure	New in R2.0 Final
IfcKinematicViscosityMeasure	New in R2.0 Final
IfcLengthMeasure	No Change
IfcLinearVelocityMeasure	New in R2.0 Final
IfcLuminousIntensityMeasure	No Change
IfcMassDensityMeasure	New in R2.0 Final
IfcMassFlowRateMeasure	New in R2.0 Final
IfcMassMeasure	No Change
IfcMonetaryMeasure	New in R2.0 Final
IfcNumericMeasure	No Change
IfcParameterValue	No Change
IfcPlaneAngleMeasure	No Change
IfcPositiveLengthMeasure	No Change
IfcPositivePlaneAngleMeasure	No Change
IfcPositiveRatioMeasure	No Change
IfcPowerMeasure	New in R2.0 Final
IfcPressureMeasure	New in R2.0 Final
IfcRatioMeasure	No Change
IfcReal	No Change
IfcFrequencyMeasure	New in R2.0 Final
IfcSolidAngleMeasure	No Change
IfcString	No Change
IfcThermalAdmittanceMeasure	New in R2.0 Final
IfcThermalResistanceMeasure	New in R2.0 Final
IfcThermalTransmittanceMeasure	New in R2.0 Final
IfcThermodynamicTemperatureMeasure	No Change
IfcTimeMeasure	No Change
IfcTimeStamp	No Change
IfcVolumeMeasure	No Change
IfcVolumetricFlowrateMeasure	New in R2.0 Final
IfcTimeDurationMeasure	Deleted

Class IfcDerivedUnit

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
Elements	SET [1:?] OF IfcDerivedUnitElement	No Change
UnitType	IfcDerivedUnitEnum	IfcDerivedUnitTypeEnum
Dimensions	IfcDimensionalExponents	No Change

Class IfcNamedUnit

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
Dimensions	IfcDimensionalExponents	No Change
UnitType	IfcUnitEnum	IfcUnitTypeEnum

Type IfcMaterialSelect

Schema

Moved from IfcPropertyResource_R151 to IfcMaterialResource in R2.0 Final

Select

R2.0 Final	Change from Release 1.5.1
IfcMaterial	No Change
IfcMaterialList	New in R2.0 Final
IfcMaterialLayer	New in R2.0 Final
IfcMaterialLayerSet	No Change
IfcMaterialComposite	Deleted

Class IfcMaterial

Schema

Moved from IfcPropertyResource_R151 to IfcMaterialResource in R2.0 Final

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
MaterialName	STRING	No Change
MaterialClassification	OPTIONAL IfcClassificationList	No Change
MaterialFinishes	SET [0:?] OF IfcMaterialFinish	New attribute in R2.0 Final
Properties	SET [0:?] OF IfcMaterialPropertySelect	New attribute in R2.0 Final
RegisteredBy	IfcProjectMaterialRegistry	Deleted

Class IfcMaterialLayer

Schema

Moved from IfcPropertyResource_R151 to IfcMaterialResource in R2.0 Final

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
Material	IfcMaterial	No Change
OffsetFromMLSBase	IfcLengthMeasure	IfcPositiveLengthMeasure
LayerThickness	IfcPositiveLengthMeasure	No Change
ToMaterialLayerSet	IfcMaterialLayerSet	New attribute in R2.0 Final
DefaultPriority	INTEGER	Deleted

Class IfcMaterialLayerSet

Schema

Moved from IfcPropertyResource_R151 to IfcMaterialResource in R2.0 Final

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
HasMaterialLayers	LIST [1:?] OF IfcMaterialLayer	No Change
IsVentilated	BOOLEAN	New attribute in R2.0 Final
LayerSetName	STRING	Deleted

Class IfcMaterialLayerSetUsage

Schema

Moved from IfcPropertyResource_R151 to IfcMaterialResource in R2.0 Final

Attributes and Relationships

No Changes

Class IfcMaterialList

Name

Name changed from IfcMaterialComposite to IfcMaterialList in R2.0 Final

Schema

Moved from IfcPropertyResource_R151 to IfcMaterialResource in R2.0 Final

Attributes and Relationships

No Changes

Class IfcObjectReference

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
ObjectReference	IfcObjectReferenceSelect	IfcGloballyUniqueId
Descriptor	STRING	Deleted

Class IfcProperty

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
Name	STRING	New attribute in R2.0 Final
PartOfPropertyList	SET [0:1] OF IfcPropertyList	New attribute in R2.0 Final
PartOfPropertySet	SET [0:1] OF IfcPropertySet	Deleted

Class IfcPropertySet

Schema

Moved from IfcPropertyResource to IfcKernel in R2.0 Final

Superclass

Superclass changed from IfcProperty to IfcPropertyDefinition

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
Name	STRING	New attribute in R2.0 Final
HasProperties	LIST [1:?] OF IfcProperty	No Change
ProjectId	IfcGloballyUniqueId	Deleted
Descriptor	STRING	Deleted

Class IfcRepresentationContext

Schema

Moved from IfcPropertyResource to IfcRepresentationResource in R2.0 Final

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
GlobalId	IfcGloballyUniqueId	New attribute in R2.0 Final
ContextIdentifier	STRING	New attribute in R2.0 Final
ContextType	STRING	New attribute in R2.0 Final
RepresentationsInContext	SET [1:?] OF IfcRepresentation	SET [1:?] OF IfcShapeRepresentation
ProjectId	IfcGloballyUniqueId	Deleted
DetailType	IfcRepDetailTypeEnum	Deleted
ViewType	IfcRepViewTypeEnum	Deleted
Precision	INTEGER	Deleted

Class IfcShapeAspect

Schema

Moved from IfcPropertyResource to IfcRepresentationResource in R2.0 Final

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
GlobalId	IfcGloballyUniqueId	New attribute in R2.0 Final
ShapeRepresentations	LIST [1:?] OF IfcShapeRepresentation	No Change
Name	OPTIONAL STRING	New attribute in R2.0 Final
Description	OPTIONAL STRING	New attribute in R2.0 Final
ProductDefinitional	LOGICAL	New attribute in R2.0 Final
PartOfProductDefinitionShape	IfcProductDefinitionShape	New attribute in R2.0 Final
ProjectId	IfcGloballyUniqueId	Deleted
Descriptor	STRING	Deleted
PartOfProductShape	IfcProductShape	Deleted

Class IfcShapeRepresentation

Schema

Moved from IfcPropertyResource to IfcRepresentationResource in R2.0 Final

Superclass

Superclass changed from Nothing to IfcRepresentation

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
Items	SET [1:?] OF IfcGeometricRepresentationItem	No Change
OfProductDefinitionShape	SET [0:1] OF IfcProductDefinitionShape	New attribute in R2.0 Final
OfShapeAspect	SET [0:1] OF IfcShapeAspect	No Change
ContextOfItems	IfcRepresentationContext	Deleted
RepresentationType	IfcShapeRepTypeEnum	Deleted
UsageDescriptor	STRING	Deleted
OfProductShape	SET [0:1] OF IfcProductShape	Deleted

Class IfcSimpleProperty

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
ValueComponent	IfcMeasureValue	No Change
Descriptor	STRING	Deleted

Class IfcSimplePropertyWithUnit

Name

Name changed from IfcPropertyWithUnit to IfcSimplePropertyWithUnit in R2.0 Final

Superclass

Superclass changed from IfcSimpleProperty to IfcProperty

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
ValueWithUnit	IfcMeasureWithUnit	New attribute in R2.0 Final
UnitComponent	IfcUnit	Deleted

Class IfcProductDefinitionShape

Name

Name changed from IfcProductShape to IfcProductDefinitionShape in R2.0 Final

Schema

Moved from IfcPropertyResource to IfcRepresentationResource in R2.0 Final

Superclass

Superclass changed from IfcProperty to IfcProductRepresentation

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
ShapeRepresentations	LIST [1:?] OF IfcShapeRepresentation	No Change
HasShapeAspects	SET [0:?] OF IfcShapeAspect	No Change
ProjectId	IfcGloballyUniqueId	Deleted
Descriptor	STRING	Deleted

Class IfcRepresentationContext

Schema

Moved from IfcPropertyResource to IfcRepresentationResource in R2.0 Final

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
GlobalId	IfcGloballyUniqueId	New attribute in R2.0 Final
ContextIdentifier	STRING	New attribute in R2.0 Final
ContextType	STRING	New attribute in R2.0 Final
RepresentationsInContext	SET [1:?] OF IfcRepresentation	SET [1:?] OF IfcShapeRepresentation
ProjectId	IfcGloballyUniqueId	Deleted
DetailType	IfcRepDetailTypeEnum	Deleted
ViewType	IfcRepViewTypeEnum	Deleted
Precision	INTEGER	Deleted

Class IfcShapeAspect

Schema

Moved from IfcPropertyResource to IfcRepresentationResource in R2.0 Final

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
GlobalId	IfcGloballyUniqueId	New attribute in R2.0 Final
ShapeRepresentations	LIST [1:?] OF IfcShapeRepresentation	No Change
Name	OPTIONAL STRING	New attribute in R2.0 Final
Description	OPTIONAL STRING	New attribute in R2.0 Final
ProductDefinitional	LOGICAL	New attribute in R2.0 Final
PartOfProductDefinitionShape	IfcProductDefinitionShape	New attribute in R2.0 Final
ProjectId	IfcGloballyUniqueId	Deleted
Descriptor	STRING	Deleted
PartOfProductShape	IfcProductShape	Deleted

Class IfcShapeRepresentation

Schema

Moved from IfcPropertyResource to IfcRepresentationResource in R2.0 Final

Superclass

Superclass changed from Nothing to IfcRepresentation

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
Items	SET [1:?] OF IfcGeometricRepresentationItem	No Change
OfProductDefinitionShape	SET [0:1] OF IfcProductDefinitionShape	New attribute in R2.0 Final
OfShapeAspect	SET [0:1] OF IfcShapeAspect	No Change
ContextOfItems	IfcRepresentationContext	Deleted
RepresentationType	IfcShapeRepTypeEnum	Deleted
UsageDescriptor	STRING	Deleted
OfProductShape	SET [0:1] OF IfcProductShape	Deleted

Class IfcAuditTrail

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
CreationDate	IfcTimeStamp	No Change
DeletionDate	OPTIONAL IfcTimeStamp	No Change
CreatingUser	IfcPersonAndOrganization	INTEGER
DeletingUser	OPTIONAL IfcPersonAndOrganization	OPTIONAL INTEGER
CreatingApplication	IfcApplication	INTEGER
DeletingApplication	OPTIONAL IfcApplication	OPTIONAL INTEGER
Transactions	LIST [0:?] OF IfcTransaction	LIST [0:AuditTrailLength] OF IfcTransaction
ToOwnerHistory	IfcOwnerHistory	No Change
AuditTrailLength	INTEGER	Deleted

Class IfcOwnerHistory

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
OwningUser	IfcPersonAndOrganization	New attribute in R2.0 Final
OwningApplication	IfcApplication	INTEGER
ModifiedFlag	IfcModifiedFlag	New attribute in R2.0 Final
ApplicationId	OPTIONAL STRING	No Change
OwnerDescriptor	OPTIONAL STRING	No Change
AuditTrail	OPTIONAL IfcAuditTrail	No Change
OwningActor	INTEGER	Deleted

Class IfcTable

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
GlobalId	IfcGloballyUniqueId	New attribute in R2.0 Final
Name	STRING	No Change
Rows	LIST [1:?] OF IfcTableRow	No Change
NumberOfCellsInRow	INTEGER	No Change
NumberOfHeadings	INTEGER	No Change
NumberOfDataRows	INTEGER	No Change
ProjectId	IfcGloballyUniqueId	Deleted

Class IfcTransaction

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
TransactionDate	IfcTimeStamp	No Change
TransactingUser	IfcPersonAndOrganization	INTEGER
TransactingApplication	IfcApplication	INTEGER
ToAuditTrail	IfcAuditTrail	No Change

Type IfcContainmentEnum

Name

Name changed from IfcContainmentTypeEnum to IfcContainmentEnum in R2.0 Final

Enumeration

R2.0 Final	Change from Release 1.5.1
ProjectContainer	No Change
SiteContainer	No Change
BuildingContainer	No Change
BuildingStoreyContainer	No Change
SpaceContainer	No Change
ZoneContainer	New in R2.0 Final
NotDefined	New in R2.0 Final

Type IfcProxyEnum

Name

Name changed from IfcProxyTypeEnum to IfcProxyEnum in R2.0 Final

Enumeration

R2.0 Final	Change from Release 1.5.1
Product	No Change
Process	No Change
Control	No Change
Document	No Change
Resource	No Change
NotDefined	New in R2.0 Final

Type IfcSequenceEnum

Name

Name changed from IfcSequenceTypeEnum to IfcSequenceEnum in R2.0 Final

Enumeration

R2.0 Final	Change from Release 1.5.1
Start_Start	No Change
Start_Finish	No Change
Finish_Start	No Change
Finish_Finish	No Change
NotDefined	New in R2.0 Final

Class IfcControl

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
Classification	OPTIONAL IfcClassificationList	New attribute in R2.0 Final
Controls	SET [0:?] OF IfcRelControls	New attribute in R2.0 Final

Class IfcGroup

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
GroupPurpose	OPTIONAL STRING	No Change
IsGroupedBy	IfcRelGroups	New attribute in R2.0 Final
GroupedBy	IfcRelGroups	Deleted

Class IfcObject

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
UserDefinedType	OPTIONAL STRING	New attribute in R2.0 Final
DocumentReferences	SET [0:?] OF IfcDocumentReference	New attribute in R2.0 Final
PartOfGroups	SET [0:?] OF IfcRelGroups	No Change
Nests	SET [0:1] OF IfcRelNests	No Change
IsNestedBy	SET [0:?] OF IfcRelNests	No Change
Contains	SET [0:2] OF IfcRelContains	No Change
IsContainedBy	SET [0:?] OF IfcRelContains	No Change
OperatedInProcesses	SET [0:?] OF IfcRelProcessOperatesOn	New attribute in R2.0 Final
IsDefinedBy	SET [0:?] OF IfcRelAssignsProperties	New attribute in R2.0 Final
IsActedUpon	SET [0:?] OF IfcRelActsUpon	New attribute in R2.0 Final
IsControlledBy	SET [0:?] OF IfcRelControls	New attribute in R2.0 Final
OwnerHistory	IfcOwnerHistory	Deleted
TypeDefinitions	LIST [0:?] OF IfcPropertyTypeDef	Deleted
OccurrenceProperties	LIST [0:?] OF IfcOccurrencePropertySet	Deleted
ExtendedProperties	LIST [0:?] OF IfcPropertySet	Deleted

Class IfcProcess

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
Productivity	OPTIONAL IfcMeasureWithUnit	New attribute in R2.0 Final
Classification	OPTIONAL IfcClassificationList	No Change
IsSuccessorFrom	SET [0:?] OF IfcRelSequence	No Change
IsPredecessorTo	SET [0:?] OF IfcRelSequence	No Change
OperatesOn	SET [0:?] OF IfcRelProcessOperatesOn	New attribute in R2.0 Final
PerformedBy	SET [0:?] OF IfcActorSelect	Deleted
ProcessesProducts	SET [0:2] OF IfcRelProcessesProducts	Deleted
UsesResources	SET [0:?] OF IfcRelUsesResource	Deleted

Class IfcProduct

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
LocalPlacement	IfcLocalPlacement	No Change
Representations	SET [0:2] OF IfcProductRepresentation	New attribute in R2.0 Final
Classification	OPTIONAL IfcClassificationList	No Change
ProductShape	IfcProductShape	Deleted
ProductCost	IfcCost	Deleted
ProcessedInProcesses	SET [0:?] OF IfcRelProcessesProducts	Deleted

Class IfcProject

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
ReferenceName	OPTIONAL STRING	New attribute in R2.0 Final
Name	OPTIONAL STRING	New attribute in R2.0 Final
Phase	OPTIONAL STRING	New attribute in R2.0 Final
UnitsInContext	IfcUnitAssignment	No Change
Classification	OPTIONAL IfcClassificationList	No Change
AbsolutePlacement	IfcAxis2Placement	No Change
ProjectTeam	IfcProjectTeamRegistry	Deleted
ProjectApps	IfcProjectAppRegistry	Deleted
ProjectMaterials	IfcProjectMaterialRegistry	Deleted

Class IfcPropertySet

Schema

Moved from IfcPropertyResource to IfcKernel in R2.0 Final

Superclass

Superclass changed from IfcProperty to IfcPropertyDefinition

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
Name	STRING	New attribute in R2.0 Final
HasProperties	LIST [1:?] OF IfcProperty	No Change
ProjectId	IfcGloballyUniqueId	Deleted
Descriptor	STRING	Deleted

Class IfcProxy

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
ProxyType	IfcProxyEnum	IfcProxyTypeEnum
LocalPlacement	OPTIONAL IfcLocalPlacement	No Change
Representations	SET [0:2] OF IfcProductRepresentation	New attribute in R2.0 Final
ProductShape	IfcProductShape	Deleted

Class IfcRelContains

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
RelatingObject	IfcObject	No Change
RelatedObjects	LIST [1:?] OF UNIQUE IfcObject	No Change
RelationshipType	IfcContainmentEnum	IfcContainmentTypeEnum
ContainedOrReferenced	IfcContainedOrReferencedEnum	BOOLEAN

Class IfcRelNests

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
RelatingObject	IfcObject	No Change
RelatedObjects	LIST [1:?] OF UNIQUE IfcObject	No Change
NestingPurpose	OPTIONAL STRING	New attribute in R2.0 Final

Class IfcRelProcessOperatesOn

Name

Name changed from IfcRelProcessesProducts to IfcRelProcessOperatesOn in R2.0 Final

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
RelatingProcess	IfcProcess	No Change
RelatedObject	IfcObject	New attribute in R2.0 Final
OperationType	STRING	New attribute in R2.0 Final
OperationQuantity	IfcMeasureWithUnit	New attribute in R2.0 Final
RelatedProducts	LIST [1:?] OF IfcProduct	Deleted
InOrOut	LOGICAL	Deleted

Class IfcRelSequence

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
RelatingProcess	IfcProcess	No Change
RelatedProcess	IfcProcess	No Change
TimeLag	IfcTimeMeasure	IfcTimeDurationMeasure
SequenceType	IfcSequenceEnum	IfcSequenceTypeEnum

Class IfcRelUsesResource

Schema

Moved from IfcKernel to IfcProcessExtension in R2.0 Final

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
RelatingProcess	IfcProcess	No Change
RelatedResource	IfcResource	No Change
Duration	OPTIONAL IfcTimeMeasure	New attribute in R2.0 Final
Quantity	OPTIONAL IfcMeasureWithUnit	New attribute in R2.0 Final
ProductivityConversionRate	OPTIONAL IfcMeasureWithUnit	New attribute in R2.0 Final
ConverterMultiplierOrDivider	OPTIONAL IfcMultiplierOrDivider	New attribute in R2.0 Final
ResourceUseCosts	SET [0:?] OF IfcCostElement	New attribute in R2.0 Final
WasteFactor	OPTIONAL REAL	New attribute in R2.0 Final
ResourceDuration	IfcTimeDurationMeasure	Deleted
ResourceQuantity	REAL	Deleted
ResourceUseCost	IfcCost	Deleted

Class IfcRelationship

Attributes and Relationships

Attribute / Relation	R2.0 Final	Change from Release 1.5.1
RelatedIsDependent	BOOLEAN	No Change
RelatingIsDependent	BOOLEAN	No Change
OwnerHistory	IfcOwnerHistory	Deleted
ExtendedProperties	LIST [0:?] OF IfcPropertySet	Deleted

Class IfcResource

Attributes and Relationships

Attribute / Relation

R2.0 Final </