46;IfcRoleEnum;"

Definition: Roles which may be played by an actor.

HISTORY This type has changes after IFC Release 2.0. Spelling of COMMISSIONINGENGINEER fixed in IFC 2x4.

ENUMERATION

SUPPLIER
MANUFACTURER
CONTRACTOR
SUBCONTRACTOR
ARCHITECT
STRUCTURALENGINEER
COSTENGINEER
CLIENT
BUILDINGOWNER
BUILDINGOPERATOR
MECHANICALENGINEER
ELECTRICALENGINEER
PROJECTMANAGER
FACILITIESMANAGER
CIVILENGINEER
COMMISSIONINGENGINEER
ENGINEER
OWNER
CONSULTANT
CONSTRUCTIONMANAGER
FIELDCONSTRUCTIONMANAGER
RESELLER
USERDEFINED User defined value to be provided.

" 96;IfcAddressTypeEnum;"

Definition from IAI: Identifies the logical location of the address.

HISTORY New type in IFC Release 2x.

ENUMERATION

OFFICE An office address.
SITE A site address.
HOME A home address.
DISTRIBUTIONPOINT A postal distribution point address.
USERDEFINED A user defined address type to be provided.

" 149;IfcPerformanceHistoryTypeEnum;"

This enumeration is used to identify the primary purpose of performance history. The IfcPerformanceHistoryTypeEnum contains the following:

USERDEFINED: User-defined.
NOTDEFINED: Undefined.

HISTORY: New enumeration in IFC2x4

" 165;IfcPileTypeEnum;"

Definition from IAI: Enumeration defining the pile type.

HISTORY New type in IFC Release 2x2
IFC 2x4 change: Items BORED, DRIVEN, JETGROUTING added

BORED A bore pile.
DRIVEN A rammed, vibrated, or otherwise driven pile.
JETGROUTING An injected pile-like construction.
COHESION A cohesion pile.
FRICTION A friction pile.
SUPPORT A support pile.
USERDEFINED The type of pile function is user defined.
NOTDEFINED The type of pile function is not defined.

" 177;IfcFootingTypeEnum;"

Definition from IAI: Enumeration defining the generic footing type.

HISTORY New type in IFC Release 2x2
IFC 2x4 change: Item CAISSON_FOUNDATION added

ENUMERATION

CAISSON_FOUNDATION A foundation construction type used in underwater construction.
FOOTING_BEAM Footing elements that are in bending and are supported clear of the ground. They will normally span between piers, piles or pile caps. They are distinguished from beams in the building superstructure since they will normally require a lower grade of finish. They are distinguished from STRIP_FOOTING since they are clear of the ground surface and hence require support to the lower face while the concrete is curing.
PAD_FOOTING An element that transfers the load of a single column (possibly two) to the ground.
PILE_CAP An element that transfers the load from a column or group of columns to a pier or pile or group of piers or piles.
STRIP_FOOTING A linear element that transfers loads into the ground from either a continuous element, such as a wall, or from a series of elements, such as columns.
USERDEFINED Special types of footings which meet specific local requirements.
NOTDEFINED The type of footing is not defined.

" 188;IfcSurfaceFeatureTypeEnum;"

Definition from IAI: This enumeration indicates the type of a surface feature.

HISTORY New type in IFC 2x4.

ENUMERATION

MARK A point, line, cross, or other mark, applied for example for easier adjustment of elements during assembly.
TAG A name tag, which allows to identify an element during production, delivery and assembly. May be manufactured in different ways, e.g. by printing or punching the tracking code onto the element or by attaching an actual tag.
TREATMENT A subtractive surface feature, e.g. grinding, or an additive surface feature, e.g. coating, or an impregnating treatment, or a series of any of these kinds of treatments.
USERDEFINED A user-defined type of surface feature.
NOTDEFINED An undefined type of surface feature.

" 197;IfcVoidingFeatureTypeEnum;"

Definition from IAI: This enumeration qualifies a voiding feature regarding its shape and configuration relative to the voided element.

HISTORY New type in IFC 2x4.

ENUMERATION

CUTOUT An internal cutout (creating an opening) or external cutout (creating a recess) of arbitrary shape. The edges between cutting planes may be overcut or undercut, i.e. rounded.
NOTCH An external cutout of with a mostly rectangular cutting profile. The edges between cutting planes may be overcut or undercut, i.e. rounded.
HOLE A circular or slotted or threaded hole, typically but not necessarily of smaller dimension than what would be considered a cutout.
MITER A skewed plane end cut, removing material across the entire profile of the voided element.
CHAMFER A skewed plane end cut, removing material only across a part of the profile of the voided element.
EDGE A shape modification along an edge of the element with the edge length as the predominant dimension of the feature, and feature profile dimensions which are typically much smaller than the edge length. Can for example be a chamfer edge (differentiated from a chamfer by its ratio of dimensions and thus usually manufactured differently), rounded edge (a convex edge feature), or fillet edge (a concave edge feature).
USERDEFINED A user-defined type of voiding feature.
NOTDEFINED An undefined type of voiding feature.

" 215;IfcPileConstructionEnum;"

Definition from IAI: Enumeration defining the construction type for piles. The type is mainly based on how the piles are used and manufactured. Some material information is mixed in because this affects the way the piles are used.

HISTORY New type in IFC Release 2x2

ENUMERATION

CAST_IN_PLACE Piles and piers that are excavated and poured in place.
COMPOSITE Piles that are a mix of components, such as a steel outer casing which is driven into the ground with a cast-in-place concrete core.
PRECAST_CONCRETE Piles that are entirely of precast concrete (possibly with some steel or other fixtures).
PREFAB_STEEL Prefabricated piles made entirely out of steel. It will also include steel sheet piles where these are not part of another construction element.
USERDEFINED Special types of pile construction which meet specific local requirements.
NOTDEFINED The type of pile construction is not defined.

" 240;IfcReinforcingElementTypeEnum; 383;IfcCurveInterpolationEnum;"

IfcCurveInterpolationEnum specifies the possible methods for the interpolation of property values given as a curve.

HISTORY New type in IFC2x4.

Enumeration

LINEAR: Indicates that values between the defined values are to be found by linear interpolation.
LOG_LINEAR: Indicates that values between the defined values are to be found by linear interpolation of the natural logarithm (base e) of the values.
LOG_LOG: Indicates that values between the defined values are to be found by linear interpolation of the Briggs' logarithm (base 10) of the values.
NOTDEFINED: No interpolation information is provided

" 566;IfcSpaceTypeEnum;"

Definition from IAI: This enumeration defines the available generic types for IfcSpace and IfcSpaceType.

HISTORY New enumeration in IFC2x3.
IFC2x4 CHANGE The enumerators INTERNAL and EXTERNAL have been added for upward compatibility to replace InteriorOrExteriorSpace usage.

Enumeration

SPACE Any space not falling into another category.
- NOTE For classification of spaces according to its function that is often determined by national classification systems use IfcClassificationReference via the relationship IfcRelAssociatesClassification.
PARKING A space dedication for use as a parking spot for vehicles, including access, such as a parking aisle
GFA Gross Floor Area - a specific kind of space for each building story that includes all net area and construction area (also the external envelop). Provision of such a specific space is often required by regulations.
INTERNAL
- NOTE the use is deprecated and only provided for backward compatibility purposes.
EXTERNAL
- NOTE the use is deprecated and only provided for backward compatibility purposes.

" 577;IfcSpatialZoneTypeEnum;"

Definition from IAI: This enumeration defines the range of different types of spatial zones that can further specify an IfcSpatialZoneTypeEnum.

HISTORY New enumeration in IFC Release 2x Edition 4.

Enumeration

CONSTRUCTION: the spatial zone is used to represent a construction zone for the production process
FIRESAFETY: the spatial zone is used to represent a fire safety zone, or fire compartment
LIGHTING: the spatial zone is used to represent a lighting zone, e.g. a daylight zone, or a artificial lighting zone
OCCUPANCY: the spatial zone is used to represent a zone of particular occupancy
SECURITY: the spatial zone is used to represent a zone for security planning and maintainance work.
THERMAL: the spatial zone is used to represent a thermal zone
USERDEFINED: user defined type spatial zone
NOTDEFINED: undefined type spatial zone

" 593;IfcTransportElementTypeEnum;"

Definition from IAI: This enumeration is used to identify primary transport element types. The IfcTransportElementTypeEnum contains the following:

ELEVATOR: Elevator or lift being a transport device to move people of good vertically.
ESCALATOR: Escalator being a transport device to move people. It consists of individual linked steps that move up and down on tracks while keeping the threads horizontal.
MOVINGWALKWAY: Moving walkway being a transport device to move people horizontally or on an incline. It is a slow conveyor belt that transports people.
CRANEWAY: A crane way system, normally including the crane rails, fasteners and the crane. It is primarily used to move heavy goods in a factory or other industry buildings.
LIFTINGGEAR: A device used for lifting or lowering heavy goods. It may be manually operated or electrically or pneumatically driven.

HISTORY New enumeration in IFC Release 2x.
IFC2x4 CHANGE New enumerators CRANEWAY and LIFTINGGEAR added in IFC2x4.

" 604;IfcGeographicElementTypeEnum; 610;IfcElementAssemblyTypeEnum;"

Definition from IAI: An enumeration defining the basic configuration types for element assemblies.

HISTORY New enumeration type in Release IFC2x Edition 2.

Enumeration

ACCESSORY_ASSEMBLY: Assembled accessories or components
ARCH: A curved structure
BEAM_GRID: Interconnected beams, located in one (typically horizontal) plane
BRACED_FRAME: A rigid frame with additional bracing members
GIRDER: A beam-like superstructure
REINFORCEMENT_UNIT: Assembled reinforcement elements
RIGID_FRAME: A structure built up of beams, columns, etc. with moment-resisting joints
SLAB_FIELD: Slabs, laid out in one plane
TRUSS: A structure built up of members with (quasi) pinned joints
USERDEFINED: User-defined element assembly
NOTDEFINED: Undefined element assembly

" 652;IfcProjectionElementTypeEnum;"

Definition from IAI: An enumeration defining the basic types for projection elements.

HISTORY New enumeration type in IFC2x4.

Enumeration

USERDEFINED: User-defined projection element
NOTDEFINED: Undefined projection element

" 671;IfcOpeningElementTypeEnum;"

Definition from IAI: An enumeration defining the basic types for opening elements.

HISTORY New enumeration type in IFC2x4.

Enumeration

OPENING: An opening as subtraction feature that cuts through the element it voids. It thereby creates a hole. An opening in addiion have a particular meaning for either providing a void for doors or windows, or an opening to permit flow of air and passing of light,
RECESS: A opening as subtraction feature that does not cut through the element it voids. It creates a niche or similar voiding pattern.
USERDEFINED: User-defined opening element
NOTDEFINED: Undefined opening element

" 684;IfcAssemblyPlaceEnum;"

Definition from IAI: Enumeration defining where the assembly is intended to take place, either in a factory or on the building site.

HISTORY New enumeration in Release IFC2x Edition 2.

Enumeration

SITE - this assembly is assembled at site
FACTORY - this assembly is assembled in a factory

" 728;IfcExternalSpatialElementTypeEnum;"

Definition from IAI: This enumeration defines the different types of external spatial elements.

Enumeration:

EXTERNAL - External air space around the building.
EXTERNAL_EARTH - External volume covered by earth around the building.
EXTERNAL_WATER - External volume covered with water around the building.
EXTERNAL_FIRE - Space occupied by a neightboring building.
USERDEFINED
NOTDEFINED

HISTORY New enumeration in IFC2x4.

" 750;IfcElementCompositionEnum;"

Definition from IAI: Enumeration that provides an indication, whether the spatial structure element or proxy represents a:

COMPLEX - a group or aggregation of similar elements
ELEMENT - a (undivided) element itself
PARTIAL - a subelement or part

HISTORY New enumeration in IFC Release 2.x

" 754;IfcPhysicalOrVirtualEnum;"

Definition from IAI: This enumeration defines the different types of space boundaries in terms of its physical manifestation. A space boundary can either be physically dividing or can be a virtual divider.

Enumeration:

PHYSICAL	The space boundary is provided physically, i.e. by an physical element.
VIRTUAL	The space boundary is provided virtually, i.e. by a logical divider that has no physical manifestation.
NOTDEFINED	No information available.

HISTORY: New enumeration in IFC Release 2.0

" 758;IfcInternalOrExternalEnum;"

Definition from IAI: This enumeration defines the different types of space boundaries in terms of either being inside the building or outside the building.

Enumeration:

INTERNAL
	IfcSpaceBoundary	The space boundary faces a physical or virtual element where there is an internal space on the other side.
EXTERNAL
	IfcSpaceBoundary	The space boundary faces a physical or virtual element where there is an external space on the other side (i.e. air). Or it is the space boundary of that external space against the building.
EXTERNAL_EARTH
	IfcSpaceBoundary	The space boundary faces a physical or virtual element where there is earth (or terrain) on the other side. Or it is the space boundary of that earth (or terrain object) external space against the building.
EXTERNAL_WATER
	IfcSpaceBoundary	The space boundary faces a physical or virtual element where there is water (water component of terrain) on the other side. Or it is the space boundary of that object representing water external space against the building.
EXTERNAL_FIRE
	IfcSpaceBoundary	The space boundary faces a physical or virtual element where there is another building on the other side. Or it is the space boundary of that other neighbor building against the building in question.
NOTDEFINED
		No information available.

HISTORY: New enumeration in IFC Release 2.0
IFC2x4 CHANGE: Enumeration no longer applicable to IfcSpace. The following enumerators are added: EXTERNAL_EARTH, EXTERNAL_WATER, EXTERNAL_FIRE.

" 931;IfcObjectTypeEnum;"

This enumeration defines the applicable object categories, that is, the subtypes at the 2^nd level of the IFC inheritance tree. Attached to an object, it indicates to which subtype of IfcObject the entity referencing it would otherwise comply with.

HISTORY New entity in IFC Release 1.0, has been renamed from IfcProxyEnum in IFC 2x.

" 1012;IfcComplexPropertyTemplateTypeEnum;"

This enumeration defines the subtype of instances of IfcComplexProperty or IfcPhysicalComplexQuantity that may be created and defined by an IfcComplexPropertyTemplate.

HISTORY New enumeration in IFC2x4.

Enumeration

P_COMPLEX: the properties defined by this IfcComplexPropertyTemplate are of type IfcComplexProperty.
Q_COMPLEX: the properties defined by this IfcComplexPropertyTemplate are of type IfcPhysicalComplexQuantity.

" 1023;IfcSimplePropertyTemplateTypeEnum;"

This enumeration defines the correct subtype of instances of IfcSimpleProperty or IfcPhysicalSimpleQuantity that are created and are assigned to this IfcSimplePropertyTemplate. It also determines how the attributes of IfcPropertyTemplate, PrimaryUnit, SecondaryUnit, PrimaryDataType, SecondaryDataType, should be used.

HISTORY New enumeration in IFC2x4.

Enumeration

P_SINGLEVALUE: the properties defined by this IfcPropertyTemplate are of type IfcPropertySingleValue.
P_ENUMERATEDVALUE: the properties defined by this IfcPropertyTemplate are of type IfcPropertyEnumeratedValue.
P_BOUNDEDVALUE: the properties defined by this IfcPropertyTemplate are of type IfcPropertyBoundedValue.
P_LISTVALUE: the properties defined by this IfcPropertyTemplate are of type IfcPropertyListValue.
P_TABLEVALUE: the properties defined by this IfcPropertyTemplate are of type IfcPropertyTableValue.
P_REFERENCEVALUE: the properties defined by this IfcPropertyTemplate are of type IfcPropertyReferenceValue.
Q_LENGTH: the properties defined by this IfcPropertyTemplate are of type IfcQuantityLength.
Q_AREA: the properties defined by this IfcPropertyTemplate are of type IfcQuantityArea.
Q_VOLUME: the properties defined by this IfcPropertyTemplate are of type IfcQuantityVolume.
Q_COUNT: the properties defined by this IfcPropertyTemplate are of type IfcQuantityCount.
Q_WEIGHT: the properties defined by this IfcPropertyTemplate are of type IfcQuantityWeight.
Q_TIME: the properties defined by this IfcPropertyTemplate are of type IfcQuantityTime.

" 1036;IfcPropertySetTemplateTypeEnum;"

This enumeration defines the general applicability of instances of IfcPropertySet, or IfcElementQuantity defined by this IfcPropertySetTemplate, to subtypes of IfcObjectDefinition.

HISTORY New enumeration in IFC2x4.

Enumeration

PSET_TYPEDRIVENONLY: the property sets defined by this IfcPropertySetTemplate can only be assigned to subtypes of IfcTypeObject.
PSET_TYPEDRIVENOVERRIDE: the property sets defined by this IfcPropertySetTemplate can be assigned to subtypes of IfcTypeObject and can be overridden by a property set with same name at subtypes of IfcObject.
PSET_OCCURRENCEDRIVEN: the property sets defined by this IfcPropertySetTemplate can only be assigned to subtypes of IfcObject.
PSET_PERFORMANCEDRIVEN: the property sets defined by this IfcPropertySetTemplate can only be assigned to IfcPerformanceHistory,
QTO_TYPEDRIVENONLY: the element quantity defined by this IfcPropertySetTemplate can only be assigned to subtypes of IfcTypeObject.
QTO_TYPEDRIVENOVERRIDE: the element quantity defined by this IfcPropertySetTemplate can be assigned to subtypes of IfcTypeObject and can be overridden by an element quantity with same name at subtypes of IfcObject.
QTO_OCCURRENCEDRIVEN: the element quantity defined by this IfcPropertySetTemplate can only be assigned to subtypes of IfcObject.
NOTDEFINED: No restriction provided, the property sets defined by this IfcPropertySetTemplate can be assigned to any entity, if not otherwise restricted by the ApplicableEntity attribute.

" 1063;IfcFlowDirectionEnum;"

This enumeration defines the flow direction at a port as either a SOURCE, SINK, or SOURCEANDSINK. For solids, liquids, or gas, the direction is the physical flow direction. For electric power (circuits containing hot, neutral, ground), the direction is from the origination of power (from a distribution board to protective devices to switches to fixtures). For communication signals, the direction originates from where the signal is shaped, such as a sensor. For communicaton networks, the direction originates from the up-level network host, such as a router (having SOURCE ports) hosting multiple computers (having SINK ports).

SOURCE: A flow source, where a substance flows out of the connection.
SINK: A flow sink, where a substance flows into the connection.
SOURCEANDSINK: Both a source and sink, where a substance flows both into and out of the connection simultaneously.
NOTDEFINED: Undefined flow direction.

HISTORY: New enumeration in IFC R2.0

" 1068;IfcDistributionSystemEnum;"

This enumeration identifies different types of distribution systems.

HISTORY: New enumeration in IFC R2x4

Valid enumerations for pipes and related elements include:

CHEMICAL: Arbitrary chemical further qualified by property set, such as for medical or industrial use.
CHILLEDWATER: Nonpotable chilled water, such as circulated through an evaporator.
COMPRESSEDAIR: Compressed air system.
CONDENSERWATER: Nonpotable water, such as circulated through a condensor.
DOMESTICCOLDWATER: Unheated potable water distribution system.
DOMESTICHOTWATER: Heated potable water distribution system.
DRAINAGE: Drainage collection system.
FIREPROTECTION: Fire protection sprinkler system.
GAS: Methane distribution system.
HAZARDOUS: Hazardous material or fluid collection system.
HEATING: Heated water distribution system.
OIL: Oil distribution system.
RAINWATER: Rainwater resulting from precipitation which directly falls on a parcel.
REFRIGERATION: Refrigerant distribution system for purposes of fulfilling all or parts of a refrigeration cycle.
SEWAGE: Sewage collection system.
STORMWATER: Stormwater resulting from precipitation which runs off or travels over the ground surface.
VACUUM: Vacuum distribution system.
VENT: Vent system for wastewater piping systems.
WASTE: Waste collection system.

Valid enumerations for ducts and related elements include:

AIRCONDITIONING: Conditioned air distribution system for purposes of maintaining a temperature range within one or more spaces.
EXHAUST: Exhaust air collection system for removing stale or noxious air from one or more spaces.
VENTILATION: Ventilation air distribution system involved in either the exchange of air to the outside as well as circulation of air within a building.

Valid enumerations for cables and related elements include:

AUDIOVISUAL: A transport of a single media source, having audio and/or video streams.
CONTROL: A transport or network dedicated to control system usage.
DATA: A network having general-purpose usage.
EARTHING: A path for equipotential bonding, conducting current to the ground.
ELECTRICAL: A circuit for delivering electrical power.
ELECTROACCOUSTIC: An amplified audio signal such as for loudspeakers.
LIGHTING: A circuit dedicated for lighting, such as a fixture having sockets for lamps.
LIGHTNINGPROTECTION: A path for conducting lightning current to the ground.
POWERGENERATION: A path for power generation.
SECURITY: A transport or network dedicated to security system usage.
SIGNAL: A raw analog signal, such as modulated data or measurements from sensors.
TELEPHONE: A transport or network dedicated to telephone system usage.
TV: A transport of multiple media sources (e.g. analog cable, satellite, over-the-air).

" 1128;IfcDistributionChamberElementTypeEnum;"

This enumeration identifies different types of distribution chambers.

Valid enumerations are:

FORMEDDUCT: Space formed in the ground for the passage of pipes, cables, ducts.
INSPECTIONCHAMBER: Chamber constructed on a drain, sewer or pipeline with a removable cover that permits visble inspection.
INSPECTIONPIT: Recess or chamber formed to permit access for inspection of substructure and services.
MANHOLE: Chamber constructed on a drain, sewer or pipeline with a removable cover that permits the entry of a person.
METERCHAMBER: Chamber that houses a meter(s).
SUMP: Recessed or small chamber into which liquid is drained to facilitate its collection for removal.
TRENCH: Excavated chamber, the length of which typically exceeds the width.
VALVECHAMBER: Chamber that houses a valve(s).
USERDEFINED: User-defined chamber type.
NOTDEFINED: Undefined chamber type.

HISTORY: New enumeration in IFC R2x2

" 1183;IfcBuildingElementPartTypeEnum;"

Definition from IAI: This enumeration defines the different types of building element parts:

INSULATION: The part provides thermal insulation, for example as insulation layer between wall panels in sandwich walls or as infill in stud walls.
PRECASTPANEL: The part is a precast panel, usually as an internal or external layer in a sandwich wall panel.
USERDEFINED: User-defined accessory
NOTDEFINED: Undefined accessory

HISTORY New Enumeration in IFC 2x4.

" 1191;IfcDiscreteAccessoryTypeEnum;"

Definition from IAI: This enumeration defines the different types of discrete accessories:

ANCHORPLATE: An accessory consisting of a steel plate, shear stud connectors or welded-on rebar which is embedded into the surface of a concrete element so that other elements can be welded or bolted onto it later.
BRACKET: An L-shaped or similarly shaped accessory attached in a corner between elements to hold them together or to carry a secondary element.
SHOE: A column shoe or a beam shoe (beam hanger) used to support or secure an element.
USERDEFINED: User-defined accessory
NOTDEFINED: Undefined accessory

HISTORY New Enumeration in IFC 2x4.

" 1200;IfcFastenerTypeEnum;"

Definition from IAI: This enumeration defines the different types of fasteners, except for mechanical fasteners:

GLUE: A fastening connection where glue is used to join together elements.
MORTAR: A composition of mineralic or other materials used to fill jointing gaps and possibly fulfilling a load carrying role.
WELD: A weld seam between parts of metallic material or other suitable materials.
USERDEFINED: User-defined fastener
NOTDEFINED: Undefined fastener

HISTORY New Enumeration in IFC 2x4.

" 1211;IfcMechanicalFastenerTypeEnum;"

Definition from IAI: This enumeration defines the different types of mechanical fasteners:

ANCHORBOLT: A special bolt which is anchored into conrete, stone, or brickwork.
BOLT: A threaded cylindrical rod that engages with a similarly threaded hole in a nut or any other part to form a fastener. The mechanical fastener often also includes one or more washers and one or more nuts.
DOWEL: A cylindrical rod that is driven into holes of the connected pieces.
NAIL: A thin pointed piece of metal that is hammered into materials as a fastener.
NAILPLATE: A piece of sheet metal with punched points that overlaps the connected pieces and is pressed into their material.
RIVET: A fastening part having a head at one end and the other end being hammered flat after being passed through holes in the pieces that are fastened together.
SCREW: A fastener with a tapered threaded shank and a slotted head.
SHEARCONNECTOR: A ring connector that is accepted by ring keyways in the connected pieces; or a toothed circular or square connector that is pressed into the connected pieces.
STAPLE: A doubly pointed piece of metal that is hammered into materials as a fastener.
STUDSHEARCONNECTOR: Stud shear connectors are cylindrical fastening parts with a head on one side. On the other side they are welded on steel members for the use in composite steel and concrete structures.
USERDEFINED: User-defined mechanical fastener
NOTDEFINED: Undefined mechanical fastener

HISTORY New Enumeration in IFC 2x4.

" 1245;IfcConnectionTypeEnum;"

This enumeration defines the different ways how path based elements (such as IfcWallStandardCase) can connect, as shown in Figure 65.

HISTORY New type in IFC Release 2.0

L-Shape Connection

RelatingConnectionType: AtStart
RelatedConnectionType: AtStart

L-Shape Connection

RelatingConnectionType: AtEnd
RelatedConnectionType: AtStart

T-Shape Connection

RelatingConnectionType: AtPath
RelatedConnectionType: AtStart

Figure 65 — Connection types

" 1257;IfcBeamTypeEnum;"

Definition from IAI: This enumeration defines the different types of linear elements an IfcBeamType object can fulfill:

BEAM: A standard beam usually used horizontally.
JOIST: A beam used to support a floor or ceiling.
HOLLOWCORE: A wide often prestressed beam with a hollow-core profile that usually serves as a slab component.
LINTEL: A beam or horizontal piece of material over an opening (e.g. door, window).
SPANDREL: A tall beam placed on the facade of a building. One tall side is usually finished to provide the exterior of the building. Can be used to support joists or slab elements on its interior side.
NOTE They are also referred to as ""spandrel panels"", which are parts of a facade and sometimes have supporting consoles for floor slabs integrated.
T_BEAM: A beam that forms part of a slab construction and acts together with the slab which its carries. Such beams are often of T-shape (therefore the English name), but may have other shapes as well, e.g. an L-Shape or an Inverted-T-Shape.
NOTE In order to distinguish beams by shape, the assigned IfcProfileDef subtypes provide the shape type and, if using a subtype of IfcParameterizedProfileDef, also the shape parameterization.
USERDEFINED: User-defined linear beam element.
NOTDEFINED: Undefined linear beam element

HISTORY New Enumeration in Release IFC2x Edition 2.
IFC2x4 CHANGE The enumerators HOLLOWCORE and SPANDREL have been added.

" 1273;IfcColumnTypeEnum;"

Definition from IAI: This enumeration defines the different types of linear elements an IfcColumnType object can fulfill:

COLUMN: A standard column element usually used vertically.
USERDEFINED: User-defined linear element.
NOTDEFINED: Undefined linear element

NOTE: This enumeration has been mainly introduced to allow further detailing of the type information in future releases of IFC.

HISTORY New Enumeration in Release IFC2x Edition 2.

" 1284;IfcMemberTypeEnum;"

Definition from IAI: This enumeration defines the different types of linear elements an IfcMemberType object can fulfill:

BRACE: A linear element (usually sloped) often used for bracing of a girder or truss.
CHORD: Upper or lower longitudinal member of a truss, used horizontally or sloped.
COLLAR: A linear element (usually used horizontally) within a roof structure to connect rafters and posts.
MEMBER: A linear element within a girder or truss with no further meaning.
MULLION: A linear element within a curtain wall system to connect two (or more) panels.
PLATE: A linear continuous horizontal element in wall framing, e.g. a head piece or a sole plate.
NOTE This head piece or sole plate shall not be mixed up with planar elements, such as sheets and panels, that are handled as IfcPlate (and IfcPlateType).
POST: A linear member (usually used vertically) within a roof structure to support purlins.
PURLIN: A linear element (usually used horizontally) within a roof structure to support rafters
RAFTER: A linear elements used to support roof slabs or roof covering, usually used with slope.
STRINGER: A linear element used to support stair or ramp flights, usually used with slope.
STRUT: A linear element often used within a girder or truss.
STUD: Vertical element in wall framing.
USERDEFINED: User-defined linear element.
NOTDEFINED: Undefined linear element

HISTORY: New Enumeration in Release IFC2x Edition 2.

IFC2x Edition 2 Addendum 1 CHANGE The additional identifiers CHORD, PLATE, STUD are added.
IFC2x Edition 3 CHANGE The additional identifier MULLION has been added.

" 1309;IfcWallTypeEnum;"

Definition from IAI: This enumeration defines the different types of walls an IfcWallType object can fulfill:

STANDARD: A standard wall, extruded vertically with a constant thickness along the wall path.
POLYGONAL: A polygonal wall, extruded vertically, where the wall thickness varies along the wall path.
SHEAR: A wall having a non-rectangular cross section along the wall path.
- NOTE The potentially misleading term shall not impose a particular resistance against shear forces, but a particular shape.
ELEMENTEDWALL: A stud wall framed with studs and faced with sheatings, sidings, wallboard, or plasterwork.
PLUMBINGWALL: A pier, or enclosure, or encasement, normally used to enclose plumbing in sanitary rooms.
MOVABLE: A movable wall that is either movable, e.g. a folding wall, or a sliding wall, or can be easily removed as a removable partitioning or mounting wall. Movable walls do normally not define space boundaries and often belong to the furnishing system.
USERDEFINED: User-defined wall element.
NOTDEFINED: Undefined wall element

HISTORY New Enumeration in Release IFC2x Edition 2.

IFC2x2 ADDENDUM CHANGE The enumerator POLYGON has been changed to POLYGONAL.
IFC2x3 CHANGE The enumerators ELEMENTEDWALL and PLUMBINGWALL have been added.
IFC2x4 CHANGE New enumerator MOVABLE has been added.

" 1328;IfcSlabTypeEnum;"

Definition from IAI: This enumeration defines the available predefined types of a slab. The IfcSlabTypeEnum can be used for slab occurrences, IfcSlab, and slab types, IfcSlabType. A special property set definition may be provided for each predefined type.

HISTORY New type in IFC Release 2.0

Floor	The slab is used to represent a floor slab.
Roof	The slab is used to represent a roof slab (either flat or sloped).
Landing	The slab is used to represent a landing within a stair or ramp.
BaseSlab	The slab is used to represent a floor slab against the ground (and thereby being a part of the foundation). Another name is mat foundation. IFC2x3 CHANGE new enumerator added.

" 1340;IfcRampTypeEnum;"

This enumeration defines the basic configuration of the ramp type in terms of the number and shape of ramp flights, as shown in Figure 67. The type also distinguished turns by landings. In addition the subdivision of the straight and changing direction ramps is included. The ramp configurations are given for ramps without and with one and two landings.

Ramps which are subdivided into more than two landings have to be defined by the geometry only. Also ramps with non-regular shapes have to be defined by the geometry only. The type of such ramps is USERDEFINED.

HISTORY New Enumeration in IFC Release 2.0.

Enumerator	Description	Figure
StraightRunRamp	A ramp - which is a sloping floor, walk, or roadway - connecting two levels. The straight ramp consists of one straight flight without turns or winders.
TwoStraightRunRamp	A straight ramp consisting of two straight flights without turns but with one landing.
QuarterTurnRamp	A ramp making a 90° turn, consisting of two straight flights connected by a quarterspace landing. The direction of the turn is determined by the walking line.
TwoQuarterTurnRamp	A ramp making a 180° turn, consisting of three straight flights connected by two quarterspace landings. The direction of the turn is determined by the walking line.
HalfTurnRamp	A ramp making a 180° turn, consisting of two straight flights connected by a halfspace landing. The orientation of the turn is determined by the walking line.
SpiralRamp	A ramp constructed around a circular or elliptical well without newels and landings.
UserDefined	Free form ramp (user defined operation type)
NotDefined

Figure 67 — Ramp types

" 1354;IfcStairTypeEnum;"

This enumeration defines the basic configuration of the stair type in terms of the number of stair flights and the number of landings, as illustrated in Figure 69. The type also distinguished turns by windings or by landings. In addition the subdivision of the straight and changing direction stairs is included. The stair configurations are given for stairs without and with one, two or three landings.

Stairs which are subdivided into more than three landings have to be defined by the geometry only. Also stairs with non-regular shapes have to be defined by the geometry only. The type of such stairs is OTHEROPERATION.

HISTORY New Enumeration in IFC Release 2.0.

Enumerator	Description	Figure
StraightRunStair	A stair extending from one level to another without turns or winders. The stair consists of one straight flight.
TwoStraightRunStair	A straight stair consisting of two straight flights without turns but with one landing.
QuarterWindingStair	A stair consisting of one flight with a quarter winder, which is making a 90° turn. The direction of the turn is determined by the walking line.
QuarterTurnStair	A stair making a 90° turn, consisting of two straight flights connected by a quarterspace landing. The direction of the turn is determined by the walking line.
HalfWindingStair	A stair consisting of one flight with one half winder, which makes a 180° turn. The orientation of the turn is determined by the walking line.
HalfTurnStair	A stair making a 180° turn, consisting of two straight flights connected by a halfspace landing. The orientation of the turn is determined by the walking line.
TwoQuarterWindingStair	A stair consisting of one flight with two quarter winders, which make a 90° turn. The stair makes a 180° turn. The direction of the turns is determined by the walking line.
TwoQuarterTurnStair	A stair making a 180° turn, consisting of three straight flights connected by two quarterspace landings. The direction of the turns is determined by the walking line.
ThreeQuarterWindingStair	A stair consisting of one flight with three quarter winders, which make a 90° turn. The stair makes a 270° turn. The direction of the turns is determined by the walking line.
ThreeQuarterTurnStair	A stair making a 270° turn, consisting of four straight flights connected by three quarterspace landings. The direction of the turns is determined by the walking line.
SpiralStair	A stair constructed with winders around a circular newel often without landings. Depending on outer boundary it can be either a circular, elliptical or rectangular spiral stair. The orientation of the winding stairs is determined by the walking line.
DoubleReturnStair	A stair having one straight flight to a wide quarterspace landing, and two side flights from that landing into opposite directions. The stair is making a 90° turn. The direction of traffic is determined by the walking line.
CurvedRunStair	A stair extending from one level to another without turns or winders. The stair is consisting of one curved flight.
TwoCurvedRunStair	A curved stair consisting of two curved flights without turns but with one landing.
OtherOperation	Free form stair (user defined operation type)
NotDefined

Figure 69 — Stair types

" 1376;IfcRoofTypeEnum;"

This enumeration defines the basic configuration of the roof in terms of the different roof shapes, as illustrated in Figure 68.

Roofs which are subdivided into more than these basic shapes have to be defined by the geometry only. Also roofs with non-regular shapes (free form roof) have to be defined by the geometry only. The type of such roofs is FREEFORM.

HISTORY New Enumeration in IFC Release 2x.

Enumerator	Description	Figure
FLAT_ROOF	A roof having no slope, or one with only a slight pitch so as to drain rainwater.
SHED_ROOF	A roof having a single slope.
GABLE_ROOF	A roof sloping downward in two parts from a central ridge, so as to form a gable at each end.
HIP_ROOF	A roof having sloping ends and sides meeting at an inclined projecting angle.
HIPPED_GABLE_ROOF	A roof having a hipped end truncating a gable.
GAMBREL_ROOF	A ridged roof divided on each side into a shallower slope above a steeper one.
MANSARD_ROOF	A roof having on each side a steeper lower part and a shallower upper part.
BARREL_ROOF	A roof or ceiling having a semicylindrical form.
RAINBOW_ROOF	A gable roof in the form of a broad Gothic arch, with gently sloping convex surfaces.
BUTTERFLY_ROOF	A roof having two slopes, each descending inward from the eaves.
PAVILION_ROOF	A pyramidal hip roof.
DOME_ROOF	A hemispherical hip roof.
FREEFORM	Free form roof
NOTDEFINED	No specification given

Figure 68 — Roof types

" 1400;IfcStairFlightTypeEnum;"

Definition from IAI: This enumeration defines the different types of stair flights an IfcStairFlightType object can fulfill:

STRAIGHT: A stair flight with a straight walking line.
WINDER: A stair flight with a straight walking line.
SPIRAL: A stair flight with a circular or elliptic walking line.
CURVED: A stair flight with a curved walking line.
FREEFORM: A stair flight with a free form walking line (and outer boundaries).
USERDEFINED: User-defined stair flight .
NOTDEFINED: Undefined stair flight .

HISTORY: New Enumeration in Release IFC2x Edition 2.

" 1412;IfcRampFlightTypeEnum;"

Definition from IAI: This enumeration defines the different types of linear elements an IfcRampFlightType object can fulfill:

STRAIGHT: A ramp flight with a straight walking line.
SPIRAL: A ramp flight with a circular or elliptic walking line.
USERDEFINED: User-defined ramp flight.
NOTDEFINED: Undefined ramp flight.

HISTORY: New Enumeration in Release IFC2x Edition 2.

" 1421;IfcCurtainWallTypeEnum;"

Definition from IAI: Enumeration defining the valid types of curtain wall that can be predefined using the enumeration values.

HISTORY New Enumeration in Release IFC2x Edition 3

NOTE Currently there are no specific enumerators defined, the IfcCurtainWallTypeEnum has been added for future extensions.

" 1428;IfcRailingTypeEnum;"

Definition from IAI: Enumeration defining the valid types of railings that can be predefined using the enumeration values.

HISTORY: New Enumeration in IFC Release 2.0

Enumeration

HANDRAIL: A type of railing designed to serve as an optional structural support for loads applied by human occupants (at hand height). Generally located adjacent to ramps and stairs. Generally floor or wall mounted.
GUARDRAIL: A type of railing designed to guard human occupants from falling off a stair, ramp or landing where there is a vertical drop at the edge of such floors/landings.
BALUSTRADE: Similar to the definitions of a guardrail except the location is at the edge of a floor, rather then a stair or ramp. Examples are balustrates at roof-tops or balconies.
USERDEFINED: User-defined railing element, a term to identify the user type is given by the attribute IfcRailing.ObjectType.
NOTDEFINED: Undefined railing element, no type information available.

" 1442;IfcDoorTypeEnum;"

Definition from IAI: This enumeration defines the different predefined types of an IfcDoorType object can fulfill:

DOOR: A standard door usually within a wall opening, as a door panel in a curtain wall, or as a ""free standing"" door.
GATE: A gate is a point of entry to a property usually within an opening in a fence. Or as a ""free standing"" gate.
TRAPDOOR: A special door that lies horizonally in a slab opening. Often used for accessing cellar or attic.
USERDEFINED: User-defined linear beam element.
NOTDEFINED: Undefined linear beam element

HISTORY New Enumeration in IFC2x4.

" 1448;IfcDoorTypeOperationEnum;"

This enumeration defines the basic ways to describe how doors operate, as shown in Figure 66. It combines the partitioning of the door into a single or multiple door panels and the operation types of that panels.

In the most common case of swinging doors the IfcDoorTypeOperationEnum defined the hinge side (left hing or right hung) and the opening direction (opening to the left, opening to the right). Whether the door opens inwards or outwards is determined by the local coordinate system of the IfcDoor, or IfcDoorStandardCase.

NOTE There are different definitions in various countries on what a left opening or left hung or left swing door is (same for right). Therefore the IFC definition terms may derivate from the local standard and may need to be mapped appropriately.

HISTORY New Enumeration in IFC2x4.

IFC2x4 CHANGE The new IfcDoorTypeOperationEnum replaces the use of IfcDoorStyleOperationEnum that is deprecated from IFC2x4 onwards.

Enumerator	Description	Figures
SINGLE_SWING_LEFT	Door with one panel that opens (swings) to the left. The hinges are on the left side as viewed in the direction of the positive y-axis. Note: Direction of swing (whether in or out) is determined at the IfcDoor or IfcDoorStandardCase.
SINGLE_SWING_RIGHT	Door with one panel that opens (swings) to the right. The hinges are on the right side as viewed in the direction of the positive y-axis. Note: Direction of swing (whether in or out) is determined at the IfcDoor or IfcDoorStandardCase.
DOUBLE_DOOR_ SINGLE_SWING	Door with two panels, one opens (swings) to the left the other opens (swings) to the right. Note: Direction of swing (whether in or out) is determined at the IfcDoor or IfcDoorStandardCase.
DOUBLE_SWING_LEFT	Door with one panel that swings in both directions and to the left in the main trafic direction. Also called double acting door. Note: Direction of main swing (whether in or out) is determined at the IfcDoor or IfcDoorStandardCase.
DOUBLE_SWING_RIGHT	Door with one panel that swings in both directions and to the right in the main trafic direction. Also called double acting door. Note: Direction of main swing (whether in or out) is determined at the IfcDoor or IfcDoorStandardCase.
DOUBLE_DOOR_ DOUBLE_SWING	Door with two panels, one swings in both directions and to the right in the main trafic direction the other swings also in both directions and to the left in the main trafic direction. Note: Direction of main swing (whether in or out) is determined at the IfcDoor or IfcDoorStandardCase.
DOUBLE_DOOR_ SINGLE_SWING_ OPPOSITE_LEFT	Door with two panels that both open to the left, one panel swings in one direction and the other panel swings in the opposite direction. Note: Direction of main swing (whether in or out) is determined at the IfcDoor or IfcDoorStandardCase.
DOUBLE_DOOR_ SINGLE_SWING_ OPPOSITE_RIGHT	Door with two panels that both open to the right, one panel swings in one direction and the other panel swings in the opposite direction. Note: Direction of main swing (whether in or out) is determined at the IfcDoor or IfcDoorStandardCase.
SLIDING_TO_LEFT	Door with one panel that is sliding to the left.
SLIDING_TO_RIGHT	Door with one panel that is sliding to the right.
DOUBLE_DOOR_SLIDING	Door with two panels, one is sliding to the left the other is sliding to the right.
FOLDING_TO_LEFT	Door with one panel that is folding to the left.
FOLDING_TO_RIGHT	Door with one panel that is folding to the right.
DOUBLE_DOOR_FOLDING	Door with two panels, one is folding to the left the other is folding to the right.
REVOLVING	An entrance door consisting of four leaves set in a form of a cross and revolving around a central vertical axis (the four panels are described by a single IfcDoor panel property).
ROLLINGUP	Door that opens by rolling up. Note: Whether it rolls up to the inside or outside is determined at the IfcDoor.
SWING_FIXED_LEFT	Door with one panel that opens (swings) to the left and one fixed panel. The hinges of the swinging panel are on the left side as viewed in the direction of the positive y-axis. Note: Direction of swing (whether in or out) is determined at the IfcDoor or or IfcDoorStandardCase. IFC2x4 CHANGE This is a new enumerator compared with previous IfcDoorStyleOperationEnum.
SWING_FIXED_RIGHT	Door with one panel that opens (swings) to the right and one fixed panel. The hinges of the swinging panel are on the right side as viewed in the direction of the positive y-axis. Note: Direction of swing (whether in or out) is determined at the IfcDoor or or IfcDoorStandardCase. IFC2x4 CHANGE This is a new enumerator compared with previous IfcDoorStyleOperationEnum.
USERDEFINED	User defined operation type
NOTDEFINED	A door with a not defined operation type is considered as a door with a lining, but no panels. It is thereby always open.

Figure 66 — Door operations

NOTE

Figures are shown in the ground view.
Figures (symbolic representation) depend on the national building code.
These figures are only shown as illustrations, the actual representation in the ground view might differ.
Open to the outside is declared as open into the direction of the positive y-axis, determined by the ObjectPlacement at IfcDoor
The location of the panel relative to the wall thickness is defined by the ObjectPlacement at IfcDoor, and the IfcDoorLiningProperties.LiningOffset parameter.

" 1477;IfcWindowTypeEnum;"

Definition from IAI: This enumeration defines the different predefined types of an IfcWindowType object can fulfill:

WINDOW: A standard window usually within a wall opening, as a window panel in a curtain wall, or as a ""free standing"" window.
SKYLIGHT: A window within a sloped building element, usually a roof slab.
LIGHTDOME: A special window that lies horizonally in a roof slab opening.
USERDEFINED: User-defined window element.
NOTDEFINED: Undefined window element

HISTORY New Enumeration in IFC2x4.

" 1483;IfcWindowTypePartitioningEnum;"

This enumeration defines the basic configuration of the window type in terms of the number of window panels and the subdivision of the total window as shown in Figure 70. The window configurations are given for windows with one, two or three panels (including fixed panels).

Windows which are subdivided into more than three panels have to be defined by the geometry only. The type of such windows is USERDEFINED.

HISTORY New Enumeration in IFC2x4.

NOTE The new IfcWindowTypePartitioningEnum replaces the use of IfcWindowStyleOperationEnum that is deprecated from IFC2x4 onwards.

Enumerator	Description	Figure
SinglePanel	Window with one panel.
DoublePanelVertical	Window with two panels. The configuration of the panels is vertically.
DoublePanelHorizontal	Window with two panels. The configuration of the panels is horizontally.
TriplePanelVertical	Window with three panels. The configuration of the panels is vertically.
TriplePanelHorizontal	Window with three panels. The configuration of the panels is horizontally.
TriplePanelBottom	Window with three panels. The configuration of two panels is vertically and the third one is horizontally at the bottom.
TriplePanelTop	Window with three panels. The configuration of two panels is vertically and the third one is horizontally at the top.
TriplePanelLeft	Window with three panels. The configuration of two panels is horizontally and the third one is vertically at the left hand side.
TriplePanelRight	Window with three panels. The configuration of two panels is horizontally and the third one is vertically at the right hand side.
UserDefined	user defined operation type
NotDefined

Figure 70 — Window partitioning

NOTE

The way how each panel operates is defined at the IfcWindowPanelProperties.OperationType.
The reference from the window panel to the location of that panel in the window style configuration is handled by the IfcWindowPanelProperties.PanelPosition.
The figures are shown as elevations in the XZ plane of the local placement of the window, looking into the direction of the positive Y axis.
These figures are only shown as illustrations

" 1502;IfcPlateTypeEnum;"

Definition from IAI: This enumeration defines the different types of planar elements an IfcPlateType object can fulfill:

CURTAIN_PANEL: A planar element within a curtain wall, often consisting of a frame with fixed glazing.
SHEET: A planar, flat and thin element, comes usually as metal sheet, and is often used as an additonal part within an assembly.
USERDEFINED: User-defined linear element.
NOTDEFINED: Undefined linear element

HISTORY New Enumeration in Release IFC2x Edition 2.

IFC2x Edition 3 CHANGE The additional identifiers CURTAIN_PANEL, SHEET have been added.

" 1511;IfcChimneyTypeEnum;"

Definition from IAI: Enumeration defining the valid types of chimneys that can be predefined using the enumeration values.

HISTORY New Enumeration in Release IFC2x4

NOTE Currently there are no specific enumerators defined, the IfcChimneyTypeEnum has been added for future extensions.

" 1519;IfcBuildingElementProxyTypeEnum;"

Definition from IAI: This enumeration defines the available generic types for IfcBuildingElementProxyType.

HISTORY New enumeration in Release IFC2x Edition 3.

Enumeration

USERDEFINED
NOTDEFINED

" 1532;IfcCoveringTypeEnum;"

Definition from IAI: This enumeration defines the range of different types of covering that can further specify an IfcCovering or an IfcCoveringType.

HISTORY New enumeration in IFC Release 1.0
IFC2x4 CHANGE The following enumerators of the IfcCoveringTypeEnum have been deprecated INSULATION, SLEEVING and WRAPPING.

Enumeration

CEILING: the covering is used to represent a ceiling
FLOORING: the covering is used to represent a flooring
CLADDING: the covering is used to represent a cladding
ROOFING: the covering is used to represent a roof
INSULATION: the covering is used to insulate an element for thermal or acoustic purposes.
IFC2x4 NOTE The use of this enumerator is deprecated.
MEMBRANE: an impervious layer that could be used for e.g. roof covering (below tiling - that may be known as sarking etc.) or as a damp proof course membrane
IFC2x4 NOTE The use of this enumerator is deprecated.
SLEEVING: the covering is used to isolate a distribution element from a space in which it is contained.
IFC2x4 NOTE The use of this enumerator is deprecated.
WRAPPING: the covering is used for wrapping particularly of distribution elements using tape.
IFC2x4 NOTE The use of this enumerator is deprecated.
USERDEFINED: user defined type of covering
NOTDEFINED: undefined type of covering

" 1550;IfcShadingDeviceTypeEnum;"

Definition from IAI: Enumeration defining the valid types of shading devices that can be predefined using the enumeration values.

JALOUSIE
SHUTTER
AWNING

HISTORY New Enumeration in Release IFC2x4

" 1613;IfcBuildingSystemTypeEnum;"

Definition from IAI: This enumeration identifies different types of distribution systems.

HISTORY New enumeration in IFC2x4.

Valid enumerations for building systems include:

FENESTRATION: System of doors, windows, and other fillings in opening in a building envelop that are designed to permit the passage of air or light,
SHADING: System of shading elements (external or internal) that permits the limitation or control of impact of natural sun light,
TRANSPORT: System of all transport elements in a building that enables the transport of people or goods.

" 1638;IfcInventoryTypeEnum;"

IfcInventoryTypeEnum defines the types of inventory that can be defined.

HISTORY: New Enumeration in IFC Release 2.0

Enumeration:

ASSETINVENTORY: A collection of asset instances of type IfcAsset
SPACEINVENTORY: A collection of space instances of type IfcSpace
FURNITUREINVENTORY: A collection of furniture instances of type IfcFurnishingElement
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 1647;IfcOccupantTypeEnum;"

IfcOccupantTypeEnum defines the types of occupant from which the type required can be selected.

HISTORY: New Enumeration in IFC Release 2.0 Modified in IFC 2x2

Enumeration:

ASSIGNEE: Actor receiving the assignment of a property agreement from an assignor
ASSIGNOR: Actor assigning a property agreement to an assignor
LESSEE: Actor receiving the lease of a property from a lessor
LESSOR: Actor leasing a property to a lessee
LETTINGAGENT: Actor participating in a property agreement on behalf of an owner, lessor or assignor
OWNER: Actor that owns a property
TENANT: Actor renting the use of a property fro a period of time
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 1661;IfcSystemFurnitureElementTypeEnum;"

IfcSystemFurnitureTypeEnum defines the types of system furniture from which the type required can be selected.

HISTORY: New Enumeration in IFC 2x4

Enumeration:

PANEL: Vertical panel used to divide work spaces.
WORKSURFACE: Workstation countertop.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 1670;IfcFurnitureTypeEnum;"

IfcFurnitureTypeEnum defines the types of furniture from which the type required can be selected.

HISTORY: New Enumeration in IFC 2x4.

Enumeration:

CHAIR: Furniture for seating a single person.
TABLE: Furniture with a countertop for multiple people.
DESK: Furniture with a countertop and optional drawers for a single person.
BED: Furniture for sleeping.
FILECABINET: Furniture with sliding drawers for storing files.
SHELF: Furniture for storing books or other items.
SOFA: Furniture for seating multiple people.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 1693;IfcDoorStyleOperationEnum;"

This enumeration defines the basic ways to describe how doors operate as shown in Figure 167.

HISTORY New Enumeration in Release IFC2x.

Enumerator	Description	Figure
SINGLE_SWING_LEFT	Door with one panel that opens (swings) to the left. The hinges are on the left side as viewed in the direction of the positive y-axis. Note: Direction of swing (whether in or out) is determined at the IfcDoor.
SINGLE_SWING_RIGHT	Door with one panel that opens (swings) to the right. The hinges are on the right side as viewed in the direction of the positive y-axis. Note: Direction of swing (whether in or out) is determined at the IfcDoor.
DOUBLE_DOOR_ SINGLE_SWING	Door with two panels, one opens (swings) to the left the other opens (swings) to the right. Note: Direction of swing (whether in or out) is determined at the IfcDoor.
DOUBLE_SWING_LEFT	Door with one panel that swings in both directions and to the left in the main trafic direction. Also called double acting door. Note: Direction of main swing (whether in or out) is determined at the IfcDoor.
DOUBLE_SWING_RIGHT	Door with one panel that swings in both directions and to the right in the main trafic direction. Also called double acting door. Note: Direction of main swing (whether in or out) is determined at the IfcDoor.
DOUBLE_DOOR_ DOUBLE_SWING	Door with two panels, one swings in both directions and to the right in the main trafic direction the other swings also in both directions and to the left in the main trafic direction. Note: Direction of main swing (whether in or out) is determined at the IfcDoor.
DOUBLE_DOOR_ SINGLE_SWING_ OPPOSITE_LEFT	Door with two panels that both open to the left, one panel swings in one direction and the other panel swings in the opposite direction. Note: Direction of main swing (whether in or out) is determined at the IfcDoor.
DOUBLE_DOOR_ SINGLE_SWING_ OPPOSITE_RIGHT	Door with two panels that both open to the right, one panel swings in one direction and the other panel swings in the opposite direction. Note: Direction of main swing (whether in or out) is determined at the IfcDoor.
SLIDING_TO_LEFT	Door with one panel that is sliding to the left.
SLIDING_TO_RIGHT	Door with one panel that is sliding to the right.
DOUBLE_DOOR_SLIDING	Door with two panels, one is sliding to the left the other is sliding to the right.
FOLDING_TO_LEFT	Door with one panel that is folding to the left.
FOLDING_TO_RIGHT	Door with one panel that is folding to the right.
DOUBLE_DOOR_FOLDING	Door with two panels, one is folding to the left the other is folding to the right.
REVOLVING	An entrance door consisting of four leaves set in a form of a cross and revolving around a central vertical axis (the four panels are described by a single IfcDoor panel property).
ROLLINGUP	Door that opens by rolling up. Note: Whether it rolls up to the inside or outside is determined at the IfcDoor.
USERDEFINED	User defined operation type
NOTDEFINED	A door with a not defined operation type is considered as a door with a lining, but no panels. It is thereby always open.

Figure 167 — Door style operations

NOTE

Figures are shown in the ground view.
Figures (symbolic representation) depend on the national building code.
These figures are only shown as illustrations, the actual representation in the ground view might differ.
Open to the outside is declared as open into the direction of the positive y-axis, determined by the ObjectPlacement at IfcDoor
The location of the panel relative to the wall thickness is defined by the ObjectPlacement at IfcDoor, and the IfcDoorLiningProperties.LiningOffset parameter.

" 1712;IfcDoorStyleConstructionEnum;"

Definition from IAI: This enumeration defines the basic types of construction of doors. The construction type relates to the main material (or material combination) used for making the door.

HISTORY New Enumeration in IFC Release 2x .

" 1727;IfcWindowStyleConstructionEnum;"

Definition from IAI: This enumeration defines the basic types of construction of windows. The construction type relates to the main material (or material combination) used for making the window.

HISTORY New Enumeration in IFC Release 2x .

" 1736;IfcWindowStyleOperationEnum;"

This enumeration defines the basic configuration of the window type in terms of the number of window panels and the subdivision of the total window. The window configurations are given for windows with one, two or three panels (including fixed panels) as shown in Figure 171.

Windows which are subdivided into more than three panels have to be defined by the geometry only. The type of such windows is USERDEFINED.

HISTORY New Enumeration in IFC Release 2.0.

Enumerator	Description	Figure
SinglePanel	Window with one panel.
DoublePanelVertical	Window with two panels. The configuration of the panels is vertically.
DoublePanelHorizontal	Window with two panels. The configuration of the panels is horizontally.
TriplePanelVertical	Window with three panels. The configuration of the panels is vertically.
TriplePanelHorizontal	Window with three panels. The configuration of the panels is horizontally.
TriplePanelBottom	Window with three panels. The configuration of two panels is vertically and the third one is horizontally at the bottom.
TriplePanelTop	Window with three panels. The configuration of two panels is vertically and the third one is horizontally at the top.
TriplePanelLeft	Window with three panels. The configuration of two panels is horizontally and the third one is vertically at the left hand side.
TriplePanelRight	Window with three panels. The configuration of two panels is horizontally and the third one is vertically at the right hand side.
UserDefined	user defined operation type
NotDefined

Figure 171 — Window style operations

NOTE

The way how each panel operates is defined at the IfcWindowPanelProperties.OperationType.
The reference from the window panel to the location of that panel in the window style configuration is handled by the IfcWindowPanelProperties.PanelPosition.
The figures are shown as elevations in the XZ plane of the local placement of the window, looking into the direction of the positive Y axis.
These figures are only shown as illustrations

" 1774;IfcDoorPanelOperationEnum;"

This enumeration defines the basic ways how individual door panels operate as shown in Figure 164.

HISTORY New Enumeration in IFC Release 2.0.

IFC2x4 CHANGE Enumerator FIXEDPANELadded.

Swinging
DoubleActing
Sliding
Folding
Revolving
Rollingup
FixedPanel	NOTE Enumerator added in IFC2x4.
UserDefined
NotDefined

Figure 164 — Door operations

The opening direction of the door panels is given by the local placement of the IfcDoor. The positive y-axis determines the direction as shown in Figure 165.

Figure 165 — Door panel operations

NOTE Figures (symbolic representation) depend on the national building code. These figures are only shown as illustrations

" 1784;IfcDoorPanelPositionEnum;"

Definition: This enumeration defines the basic ways to describe the location of a door panel within a door lining.

HISTORY New Enumeration in IFC Release 2.x

Figure 166 shows the designation of a door panel with PanelPosition = LEFT and a door panel with PanelPosition = RIGHT within a door style with OperationType = DOUBLE_DOOR_SINGLE_SWING. The position is given as shown in the XZ plane of the local placement, looking into the direction of the positive Y axis.

Figure 166 — Door panel positions

" 1795;IfcWindowPanelOperationEnum;"

This enumeration defines the basic ways to describe how window panels operate, as shown in Figure 168.

HISTORY New Enumeration in IFC Release 2.0

Enumerator	Description	Figure
SideHungRightHand	panel that opens to the right when viewed from the outside
SideHungLeftHand	panel that opens to the left when viewed from the outside
TiltAndTurnRightHand	panel that opens to the right and is bottom hung
TiltAndTurnLeftHand	panel that opens to the left and is bottom hung
TopHung	panel is top hung
BottomHung	panel is bottom hung
PivotHorizontal	panel is swinging horizontally (hinges are in the middle)
PivotVertical	panel is swinging vertically (hinges are in the middle)
SlidingHorizontal	panel is sliding horizontally
SlidingVertical	panel is sliding vertically
RemovableCasement	panel is removable
FixedCasement	panel is fixed
OtherOperation	user defined operation type
NotDefined

Figure 168 — Window panel operations

The opening direction of the window panels is given by the local placement of the IfcWindow. The positive y-axis determines the direction as shown in Figure 169.

NOTE

Figures are shown as viewed from the outside (in direction of the positive y-axis).
Figures (symbolic representation) depend on the national building code
These figures are only shown as illustrations

Figure 169 — Window panel directions

" 1810;IfcWindowPanelPositionEnum;"

This enumeration defines the basic configuration of the window type in terms of the location of window panels. The window configurations are given for windows with one, two or three panels (including fixed panels) as shown in Figure 170. It corresponds to the OperationType of the IfcWindowStyle definition, which references the IfcWindowPanelProperties.

Windows which are subdivided into more than three panels have to be defined by the geometry only. The type of such windows is given by an IfcWindowStyle.OperationType = USERDEFINED or NOTDEFINED (see IfcWindowStyleOperationEnum for details).

HISTORY New Enumeration in IFC Release 2.0.

Figure 170 — Window panel positions

Enumerator from IfcWindowStyleOperationEnum	Use of enumerators from IfcWindowPanelPositionEnum	Figure
DoublePanelVertical	first IfcWindowPanelProperties with PanelPosition = LEFT second IfcWindowPanelProperties with PanelPosition = RIGHT
DoublePanelHorizontal	first IfcWindowPanelProperties with PanelPosition = TOP second IfcWindowPanelProperties with PanelPosition = BOTTOM
TriplePanelVertical	first IfcWindowPanelProperties with PanelPosition = LEFTsecond IfcWindowPanelProperties with PanelPosition = MIDDLE third IfcWindowPanelProperties with PanelPosition = RIGHT
TriplePanelHorizontal	first IfcWindowPanelProperties with PanelPosition = TOP second IfcWindowPanelProperties with PanelPosition = MIDDLE third IfcWindowPanelProperties with PanelPosition = BOTTOM
TriplePanelBottom	first IfcWindowPanelProperties with PanelPosition = LEFT second IfcWindowPanelProperties with PanelPosition = RIGHT third IfcWindowPanelProperties with PanelPosition = BOTTOM
TriplePanelTop	first IfcWindowPanelProperties with PanelPosition = TOP second IfcWindowPanelProperties with PanelPosition = LEFT third IfcWindowPanelProperties with PanelPosition = RIGHT
TriplePanelLeft	first IfcWindowPanelProperties with PanelPosition = LEFT second IfcWindowPanelProperties with PanelPosition = TOP third IfcWindowPanelProperties with PanelPosition = BOTTOM
TriplePanelRight	first IfcWindowPanelProperties with PanelPosition = TOP second IfcWindowPanelProperties with PanelPosition = BOTTOM third IfcWindowPanelProperties with PanelPosition = RIGHT

NOTE

The figures are shown as elevations in the XZ plane of the local placement of the window, looking into the direction of the positive Y axis.
These figures are only shown as illustrations.

" 1840;IfcPermeableCoveringOperationEnum;"

Definition: Enumeration defining the valid types of permeable coverings.

Enumeration:

GRILL	protective screen of metal bars or wires
LOUVER	set of fixed or movable strips of wood, metal, etc. arranged to let air in while keeping light or rain out
SCREEN	upright, fixed or movable, sometimes folding framework used for protection against heat, light, access or similar
USERDEFINED	user defined permeable covering type
NOTDEFINED	no information available

HISTORY: New Enumeration in IFC Release 2.0

" 1851;IfcFlowInstrumentTypeEnum;"

The IfcFlowInstrumentTypeEnum defines the range of different types of flow instrument that can be specified.

HISTORY: New type in IFC 2x2

Enumeration

PRESSUREGAUGE: A device that reads and displays a pressure value at a point or the pressure difference between two points.
THERMOMETER: A device that reads and displays a temperature value at a point.
AMMETER: A device that reads and displays the current flow in a circuit.
FREQUENCYMETER: A device that reads and displays the electrical frequency of an alternating current circuit.
PHASEANGLEMETER: A device that reads and displays the phase angle of a phase in a polyphase electrical circuit.
POWERFACTORMETER: A device that reads and displays the power factor of an electrical circuit.
VOLTMETER_PEAK: A device that reads and displays the peak voltage in an electrical circuit.
VOLTMETER_RMS: A device that reads and displays the RMS (mean) voltage in an electrical circuit.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 1866;IfcActuatorTypeEnum;"

The IfcActuatorTypeEnum defines the range of different types of actuator that can be specified.

HISTORY: New type in IFC R2.0

Enumeration

ELECTRICACTUATOR: A device that electrically actuates a control element.
PNEUMATICACTUATOR<: A device that pneumatically actuates a control element
HYDRAULICACTUATOR: A device that electrically actuates a control element.
HANDOPERATEDACTUATOR: A device that manually actuates a control element.
THERMOSTATICACTUATOR: A device that thermostatically actuates a control element.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

See property set of actuator common attributes for specification of properties for hand operated actuators.

" 1878;IfcControllerTypeEnum;"

The IfcControllerTypeEnum defines the range of different types of controller that can be specified.

HISTORY: New type in IFC R2.0
Documentation extended in IFC 2x4. PROPORTIONALINTEGRAL and PROPORTIONALINTEGRALDERIVATIVE values deleted (property set enumeration now used). MULTIPOSITION added.

Enumeration

FLOATING: Output increases or decreases at a constant or accelerating rate.
MULTIPOSITION: Output is discrete value, can be one of three or more values.
PROGRAMMABLE: Output is programmable such as Discrete Digital Control (DDC).
PROPORTIONAL: Output is proportional to the control error and optionally time integral and derivative.
TWOPOSITION: Output can be either on or off
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 1890;IfcSensorTypeEnum;"

The IfcSensorTypeEnum defines the range of different types of sensor that can be specified.

HISTORY: New type in IFC R2.0. Added missing enumerations in IFC2x4

Enumeration

CONDUCTANCESENSOR: A device that senses or detects electrical conductance.
CONTACTSENSOR: A device that senses or detects contact, such as for detecting if a door is closed.
FIRESENSOR: A device that senses or detects fire.
FLOWSENSOR: A device that senses or detects flow in a fluid.
GASSENSOR: A device that senses or detects gas concentration.
HEATSENSOR: A device that senses or detects heat.
IONCONCENTRATIONSENSOR: A device that senses or detects ion concentration, such as for water hardness.
LEVELSENSOR: A device that senses or detects fill level, such as for a tank.
HUMIDITYSENSOR: A device that senses or detects humidity.
LIGHTSENSOR: A device that senses or detects light.
MOISTURESENSOR: A device that senses or detects moisture.
MOVEMENTSENSOR: A device that senses or detects movement.
PHSENSOR: A device that senses or detects acidity.
PRESSURESENSOR: A device that senses or detects pressure.
RADIATIONSENSOR: A device that senses or detects electromagnetic radiation.
RADIOACTIVITYSENSOR: A device that senses or detects atomic decay.
SMOKESENSOR: A device that senses or detects smoke.
SOUNDSENSOR: A device that senses or detects sound.
TEMPERATURESENSOR: A device that senses or detects temperature.
WINDSENSOR: A device that senses or detects airflow speed and direction.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 1917;IfcAlarmTypeEnum;"

The IfcAlarmTypeEnum defines the range of different types of alarm that can be specified.

HISTORY: New type in IFC 2x2

Enumeration

BELL: An audible alarm.
BREAKGLASSBUTTON: An alarm activation mechanism in which a protective glass has to be broken to enable a button to be pressed.
LIGHT: A visual alarm.
MANUALPULLBOX: An alarm activation mechanism in which activation is achieved by a pulling action.
SIREN: An audible alarm.
WHISTLE: An audible alarm.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 1930;IfcUnitaryControlElementTypeEnum;"

The IfcUnitaryControlElementTypeEnum defines the range of different types and/or functions of unitary control elements possible.

HISTORY: New type in IFC 2x4.

Enumeration

ALARMPANEL: A control element at which alarms are annunciated.
CONTROLPANEL: A control element at which devices that control or monitor the operation of a site, building or part of a building are located.
GASDETECTORPANEL: A control element at which the detection of gas is annunciated.
INDICATORPANEL: A control element at which equipment operational status, condition, safety state or other required parameters are indicated.
MIMICPANEL: A control element at which information that is available elsewhere is repeated or 'mimicked'.
HUMIDISTAT: A control element that senses and regulates the humidity of a system or space so that the humidity is maintained near a desired setpoint.
THERMOSTAT: A control element that senses and regulates the temperature of an element, system or space so that the temperature is maintained near a desired setpoint.
WEATHERSTATION: A control element that senses multiple climate properties such as temperature, humidity, pressure, wind, and rain.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 1974;IfcStructuralCurveMemberTypeEnum;"

Definition from IAI: This type definition shall be used to distinguish between different types of structural 'curve' members, such as cables. The IfcStructuralCurveTypeEnum type is referenced by the entity IfcStructuralCurveMember.

RIGID_JOINED_MEMBER: A member with capacity to carry transverse and axial loads, i.e. a beam. Its actual joints may be rigid or pinned. Typically used in rigid frames.
PIN_JOINED_MEMBER: A member with capacity to carry axial loads only, i.e. a link. Typically used in trusses.
CABLE: A tension member which is able to carry transverse loads only under large deflection.
TENSION_MEMBER: A member without compressional stiffness.
COMPRESSION_MEMBER: A member without tensional stiffness.
USERDEFINED: A specially defined member.
NOTDEFINED: A member without further categorization.

HISTORY New type in IFC 2x2.
IFC 2x4 change: Renamed from IfcStructuralCurveTypeEnum.

" 1988;IfcStructuralSurfaceMemberTypeEnum;"

Definition from IAI: This type definition shall be used to distinguish between different types of structural surface members, such as the typical mechanical function of walls, slabs and shells.

BENDING_ELEMENT: A member with capacity to carry out-of-plane loads, i.e. a plate.
MEMBRANE_ELEMENT: A member with capacity to carry in-plane loads, for example a shear wall.
SHELL: A member with capacity to carry in-plane and out-of-plane loads, i.e. a combination of bending element and membrane element.
USERDEFINED: A specially defined member.
NOTDEFINED: A member without further categorization.

HISTORY New type in IFC 2x2.
IFC 2x4 change: Renamed from IfcStructuralSurfaceTypeEnum.

" 2015;IfcAnalysisModelTypeEnum;"

Definition from IAI: This type definition is used to distinguish between different types of structural analysis models. The analysis models are differentiated by their dimensionality.

HISTORY: New type in Release IFC2x Edition 2.

" 2037;IfcAnalysisTheoryTypeEnum;"

Definition from IAI: This type definition is used to distinguish between different types of structural analysis methods, i.e. first order theory, second order theory (small deformations), third order theory (large deformations) and the full nonlinear theory (geometric nonlinearity together with other nonlinearities, e.g. plasticity).

HISTORY: New type in Release IFC2x Edition 2.

" 2047;IfcLoadGroupTypeEnum;"

Definition from IAI: This type definition is used to distinguish between different levels of load grouping. It allows to differentiate between load groups, load cases, and load combinations. Normally, these enumeration types shall be used in the following context:

LOAD_GROUP groups instances of subtypes of IfcStructuralAction. It shall be used as a container for loads grouped together for specific purposes, e.g. loads which are part of a special load pattern.
LOAD_CASE groups LOAD_GROUPs and instances of subtypes of IfcStructuralAction. It should be used as a container for loads with the same origin.
LOAD_COMBINATION_GROUP is an intermediate level between LOAD_CASE and LOAD_COMBINATION. The purpose of this level is to provide a factor with which one or more LOAD_CASEs occur in a LOAD_COMBINATION. This factor cannot be specified directly at the load case if the load case is meant to occur in more than one combination with different factors.
This intermediate level is obsolete. Instead,
LOAD_COMBINATION is used to group load cases which act together into a load combination.
USERDEFINED: A grouping level which does not follow the standard hierarchy of load group types.
NOTDEFINED: The grouping level is not yet known.

HISTORY: New type in IFC 2x2.

IFC 2x4 change: Obsolete item LOAD_COMBINATION_GROUP removed. Load cases are directly assigned to load combinations with different factors for each load case—load combination pair by means of IfcRelAssignsToGroupByFactor.

" 2053;IfcActionTypeEnum;"

Definition from IAI: This enumeration type is used to distinguish between possible action types at a high level. It can be used for an automated definition of load combinations and for dimensioning. The contained items and their acronyms are adopted from the Eurocode standard.

HISTORY: New type in Release IFC2x Edition 2.

" 2059;IfcActionSourceTypeEnum;"

Definition from IAI:This enumeration type contains possible action sources.

HISTORY: New type in Release IFC2x Edition 2.

" 2108;IfcStructuralCurveActivityTypeEnum;"

Definition from IAI: Enumeration defining the distribution of load values in a curve action or reaction.

HISTORY New type in IFC 2x4

ENUMERATION

CONST The load has a constant value over its entire extent.
LINEAR The load value is linearly distributed over the load's extent.
POLYGONAL The load consists of several consecutive linear sections.
EQUIDISTANT The load consists of n consecutive sections of same length and is specified by n+1 load samples. The interpolation type over the segments is not defined by this distribution type but may be qualified in IfcObject.ObjectType based on additional agreements.
SINUS The load value is distributed as a sinus half wave.
PARABOLA The load value is distributed as a half wave described by a symmetric quadratic parabola.
DISCRETE The load is specified as a series of discrete load points.
USERDEFINED The load distribution is user-defined.
NOTDEFINED The load distribution is undefined.

" 2118;IfcProjectedOrTrueLengthEnum;"

This enumeration type is needed for load definition and is only considered if the load values are given as global actions and if they define linear or planar loads (that is, one- or two-dimensionally distributed loads).

Figure 234 illustrates the interpretation of a load definition depending on the enumeration types IfcGlobalOrLocalEnum and IfcProjectedOrTrueLengthEnum.

HISTORY New type in IFC2x2.

Figure 234 — Projected or true length

" 2129;IfcStructuralSurfaceActivityTypeEnum;"

Definition from IAI: Enumeration defining the distribution of load values in a surface action or reaction.

HISTORY New type in IFC 2x4

ENUMERATION

CONST The load has a constant value over its entire extent.
BILINEAR The load value is bilinearly distributed over the load's extent.
DISCRETE The load is specified as a series of discrete load points.
ISOCONTOUR The load is specified by a series of iso-curves (level sets), i.e. curves at which the load value is constant. These curves run perpendicularly to the load gradient.
USERDEFINED The load distribution is user-defined.
NOTDEFINED The load distribution is undefined.

" 2237;IfcGeometricProjectionEnum;"

IfcGeometricProjectionEnum defines the various representation types that can be semantically distinguished. Often different levels of detail of the shape representation are controlled by the representation type.

GRAPH_VIEW: Geometric display representation that shows an abstract, often 1D element representation, e.g. representing a wall by its axis line.
SKETCH_VIEW: Geometric display representation that shows an abstract, often 2D element representation, e.g. representing a wall by its two foot print edges, surpressing any inner layer representation.
MODEL_VIEW: Geometric display representation that shows a full 3D element representation, e.g. representing a wall by its volumetric body.
PLAN_VIEW: Geometric display representation that shows a full 2D element representation, the level of detail often depends on the target scale, e.g. representing a wall by its two foot print edges and the edges of all inner layers. The projection is shown in ground view as seen from above.
REFLECTED_PLAN_VIEW: Geometric display representation that shows a full 2D element representation, the level of detail often depends on the target scale, e.g. representing a wall by its two foot print edges and the edges of all inner layers. The projection is shown in ground view as seen from below.
SECTION_VIEW: Geometric display representation that shows a full 2D element representation, the level of detail often depends on the target scale, e.g. representing a wall by its two inner/outer edges and the edges of all inner layers, if the element is cut by the section line.
ELEVATION_VIEW: Geometric display representation that shows a full 2D element representation, the level of detail often depends on the target scale, e.g. representing a wall by its bounding edges if the element is within an elevation view.
USERDEFINED: A user defined specification is given by the value of the UserDefinedTargetView attribute.
NOTDEFINED: No specification given.

HISTORY: New Type in Release IFC2x2.

" 2252;IfcGlobalOrLocalEnum;"

This enumeration type defines if the local object coordinate system or the global world coordinate system for the project is used to describe the measure values of entities which have a reference to this type.

NOTE The world coordinate system is given by the IfcGeometricRepresentationContext.WorldCoordinateSystem and is unique within the project. The local (or object) coordinate system is given by IfcProduct.ObjectPlacement and is used by all IfcRepresentation's within the IfcProduct.Representation.

HISTORY: New type in IFC2x2.

" 2487;IfcTaskTypeEnum;"

The IfcTaskTypeEnum defines the range of different types of task that can be specified.

HISTORY New type in IFC2x4

Enumeration:

ATTENDANCE: Attendance or waiting on other things happening

CONSTRUCTION: Constructing or building something

DEMOLITION: Demolishing or breaking down something

DISMANTLE: Taking something apart carefully so that it can be recycled or reused

DISPOSAL: Disposing or getting rid of something

INSTALLATION: Installing something (equivalent to construction but more commonly used for engineering tasks)

LOGISTIC: Transporation or delivery of something

MAINTENANCE: Keeping something in good working order

MOVE: Moving things from one place to another

OPERATION: A procedure undertaken to start up the operation an artifact

REMOVAL: Removal of an item from use and taking it from its place of use

RENOVATION: Bringing something to an 'as-new' state

" 2506;IfcProcedureTypeEnum;"

The IfcProcedureTypeEnum defines the range of different types of procedure that can be specified.

HISTORY: New type in IFC2x2

Enumeration:

ADVICE_CAUTION: A caution that should be taken note of as a procedure or when carrying out a procedure

ADVICE_NOTE: Additional information or advice that should be taken note of as a procedure or when carrying out a procedure

ADVICE_WARNING: A warning of potential danger that should be taken note of as a procedure or when carrying out a procedure

CALIBRATION: A procedure undertaken to calibrate an artifact

SHUTDOWN: A procedure undertaken to shutdown the operation an artifact

STARTUP: A procedure undertaken to start up the operation an artifact

USERDEFINED

NOTDEFINED

" 2523;IfcEventTypeEnum;"

The IfcEventTypeEnum defines the range of different types of event that can be specified.

HISTORY New type in IFC2x4

Enumeration:

STARTEVENT: An initiating event of a process

ENDEVENT: A terminating event of a process

INTERMEDIATEEVENT: An event that occurs at an intermediate stage of a process

USERDEFINED

NOTDEFINED

" 2529;IfcEventTriggerTypeEnum;"

The IfcEventTriggerTypeEnum defines the range of different types of event trigger that can be specified.

HISTORY: New type in IFC2x4

Enumeration: The definition of event trigger types has been adopted from the Business Process Modeling Notation (BPMN), which is also used in the Information Delivery Manual (IDM) for defining business processes. More detailed information about the use of event trigger types can be found in these specifications.

EVENTRULE: An event trigger that is a rule or constraint

EVENTMESSAGE: An event trigger that is a message or set of information

EVENTTIME: An event trigger that is at, or occurs after, a particular point in or period of time

EVENTCOMPLEX: An event trigger that is a complex combination of things

USERDEFINED

NOTDEFINED

" 2549;IfcWorkPlanTypeEnum;"

An IfcWorkPlanTypeEnum is an enumeration data type that specifies the types of work plan from which the relevant control can be selected.

HISTORY Introduced in IFC2x4. Derived from IfcWorkControlTypeEnum that was introduced in IFC Release 2.0.

Enumeration:

ACTUAL: A control in which actual items undertaken are indicated.

BASELINE: A control that is a baseline from which changes that are made later can be recognized.

PLANNED: A control showing planned items.

USERDEFINED

NOTDEFINED

" 2558;IfcWorkScheduleTypeEnum;"

An IfcWorkScheduleTypeEnum is an enumeration data type that specifies the types of work schedule from which the relevant control can be selected.

HISTORY Introduced in IFC2x4. Derived from IfcWorkControlTypeEnum that was introduced in IFC Release 2.0.

Enumeration:

ACTUAL: A control in which actual items undertaken are indicated

BASELINE: A control that is a baseline from which changes that are made later can be recognized

PLANNED: A control showing planned items

USERDEFINED

NOTDEFINED

" 2569;IfcWorkCalendarTypeEnum;"

An IfcWorkCalendarTypeEnum is an enumeration data type that specifies the types of work calendar from which the relevant control can be selected. If given it should help to identify base calendars.

HISTORY: Introduced in IFC2x4.

Enumeration:

FIRSTSHIFT: Belongs to the first shift

SECONDSHIFT: Belongs to the second shift

THIRDSHIFT: Belongs to the third shift

USERDEFINED

NOTDEFINED

" 2583;IfcSequenceEnum;"

IfcSequenceEnum is an enumeration that defines the different ways in which a time lag is applied to a sequence between two processes.

HISTORY New entity in IFC 1.0

" 2609;IfcCostScheduleTypeEnum;"

An IfcCostScheduleTypeEnum is a list of the available types of cost schedule from which that required may be selected.

HISTORY: New type in IFC 2x2

Enumeration

BUDGET: An allocation of money for a particular purpose.
COSTPLAN: An assessment of the amount of money needing to be expended for a defined purpose based on incomplete information about the goods and services required for a construction or installation.
ESTIMATE: An assessment of the amount of money needing to be expended for a defined purpose based on actual information about the goods and services required for a construction or installation.
TENDER: An offer to provide goods and services.
PRICEDBILLOFQUANTITIES: A complete listing of all work items forming construction or installation works in which costs have been allocated to work items.
UNPRICEDBILLOFQUANTITIES: A complete listing of all work items forming construction or installation works in which costs have not yet been allocated to work items.
SCHEDULEOFRATES: A listing of each type of goods forming construction or installation works with the cost of purchase, construction/installation, overheads and profit assigned so that additional items of that type can be costed.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 2623;IfcProjectOrderTypeEnum;"

An IfcProjectOrderTypeEnum is a list of the types of project order that may be identified.

HISTORY: New type in IFC 2x2

Enumeration

CHANGEORDER: An instruction to make a change to a product or work being undertaken and a description of the work that is to be performed.
MAINTENANCEWORKORDER: An instruction to carry out maintenance work and a description of the work that is to be performed.
MOVEORDER: An instruction to move persons and artefacts and a description of the move locations, objects to be moved, etc.
PURCHASEORDER: An instruction to purchase goods and/or services and a description of the goods and/or services to be purchased that is to be performed.
WORKORDER: A general instruction to carry out work and a description of the work to be done. Note the difference between a work order generally and a maintenance work order.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 2635;IfcCostItemTypeEnum;"

An IfcCostItemTypeEnum is a list of the available types of cost items.

HISTORY: New type in IFC2x4

Enumeration

USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 2642;IfcPermitTypeEnum;"

IfcPermitTypeEnum defines the types of permits that can be granted.

HISTORY: New Enumeration in IFC2x4.

Enumeration:

ACCESS: Enables access to an identified area.
BUILDING: Enables work to proceed by getting regulatory permissions.
WORK: Enables work to be carried out in an identified area.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 2652;IfcActionRequestTypeEnum;"

IfcActionRequestTypeEnum defines the types of sources through which a request can be made.

HISTORY: New Enumeration in IFC2x4.

Enumeration:

EMAIL: Request was made through email.
FAX: Request was made through facsimile.
PHONE: Request was made verbally over a telephone.
POST: Request was made through postal mail.
VERBAL: Request was made verbally in person.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 2678;IfcConstructionEquipmentResourceTypeEnum;"

This enumeration is used to identify the primary purpose of a construction equipment resource. It is limited to the most common equipment used in construction. The IfcConstructionEquipmentResourceTypeEnum contains the following:

DEMOLISHING: Removal or destruction of building elements.
EARTHMOVING: Excavating, filling, or contouring earth.
ERECTING: Lifting, positioning, and placing elements.
HEATING: Temporary heat to support construction.
LIGHTING: Temporary lighting to support construction.
PAVING: Asphalt or concrete roads or walkways.
PUMPING: Installing materials through pumps.
TRANSPORTING: Transporting products or materials.
USERDEFINED: User-defined resource.
NOTDEFINED: Undefined resource.

HISTORY: New enumeration in IFC2x4

" 2692;IfcLaborResourceTypeEnum;"

This enumeration is used to identify the primary purpose of a labor resource, and is limited to high-level categories based upon common skillsets. The IfcLaborResourceTypeEnum contains the following:

ADMINISTRATION: Coordination of work.
CARPENTRY: Rough carpentry including framing.
CLEANING: Removal of dust and debris.
DRYWALL: Gypsum wallboard placement and taping.
ELECTRIC: Electrical fixtures, equipment, and cables.
FINISHING: Finish carpentry including custom cabinetry.
FLOORING: Carpet, tile, terazzo, wood, or other flooring.
HVAC: Heating and ventilation fixtures, equipment, and ducts.
GENERAL: General labor not requiring specific skill.
LANDSCAPING: Grass, plants, trees, or irrigation.
MASONRY: Laying bricks or blocks with mortar.
PAINTING: Applying decorative coatings or coverings.
PAVING: Asphalt or concrete roads and walkways.
PLUMBING: Plumbing fixtures, equipment, and pipes.
ROOFING: Membranes, shingles, tile, or other roofing.
SITEGRADING: Excavating, filling, or contouring earth.
STEELWORK: Erecting and attaching steel elements.
SURVEYING: Determining positions, distances, and angles.
USERDEFINED: User-defined resource.
NOTDEFINED: Undefined resource.

HISTORY: New enumeration in IFC2x4

" 2717;IfcCrewResourceTypeEnum;"

This enumeration is used to identify the primary purpose of a crew resource. The IfcCrewResourceTypeEnum contains the following:

OFFICE: A composition of resources performing administration work in an office.
SITE: A composition of resources performing production work on a construction site.
USERDEFINED: User-defined resource.
NOTDEFINED: Undefined resource.

HISTORY: New enumeration in IFC2x4

" 2725;IfcSubContractResourceTypeEnum;"

This enumeration is used to identify the primary purpose of a subcontract resource. The IfcSubContractResourceTypeEnum contains the following:

PURCHASE: Furnishing or supplying products.
WORK: Performing work onsite.
USERDEFINED: User-defined resource.
NOTDEFINED: Undefined resource.

HISTORY: New enumeration in IFC2x4

" 2733;IfcConstructionProductResourceTypeEnum;"

This enumeration is used to identify the primary purpose of a construction product resource. It describes use of products created for construction, and excludes products of the finished building model. The IfcConstructionProductsResourceTypeEnum contains the following:

ASSEMBLY: Construction of assemblies for use as input to the building model or other assemblies.
FORMWORK: Construction or placement of forms for placing materials such as concrete.
USERDEFINED: User-defined resource.
NOTDEFINED: Undefined resource.

HISTORY: New enumeration in IFC2x4

" 2741;IfcConstructionMaterialResourceTypeEnum;"

This enumeration is used to identify the primary purpose of a construction material resource. It is limited to the most common raw materials used in construction and excludes materials commonly sold as finished products. The IfcConstructionMaterialResourceTypeEnum contains the following:

AGGREGATES: Construction aggregate including sand, gravel, and crushed stone.
CONCRETE: Cast-in-place concrete.
DRYWALL: Wall board, including gypsum board.
FUEL: Fuel for running equipment.
GYPSUM: Any gypsum material.
MASONRY: Masonry including brick, stone, concrete block, glass block, and tile.
METAL: Any metallic material.
PLASTIC: Any plastic material.
WOOD: Any wood material.
USERDEFINED: User-defined resource.
NOTDEFINED: Undefined resource.

HISTORY: New enumeration in IFC2x4

" 2753;IfcResourceConsumptionEnum;"

The IfcResourceConsumptionEnum indicates how a construction resource is consumed during its use. The IfcResourceConsumptionEnum contains the following:

CONSUMED: Resource is production-based and is immediately consumed at the start of its usage.
PARTIALLYCONSUMED: Resource is production-based and is consumed over its usage.
NOTCONSUMED: Resource is production-based and is not consumed during its usage.
OCCUPIED: Resource is duration-based and is immediately consumed at the start of its usage.
PARTIALLYOCCUPIED: Resource is duration-based and is consumed over its usage.
NOTOCCUPIED: Resource is duration-based and is not consumed during its usage.
USERDEFINED: User-defined consumption; custom property sets must indicate usage.
NOTDEFINED: Undefined consumption.

HISTORY: New Enumeration in IFC Release 2.0.

" 2799;IfcOutletTypeEnum;"

The IfcOutletTypeEnum defines the range of different types of outlet that can be specified.

HISTORY: New type in IFC 2x. Telephone and Data outlets added in IFC 2x4

Enumeration

AUDIOVISUALOUTLET: An outlet used for an audio or visual device.
COMMUNICATIONSOUTLET: An outlet used for connecting communications equipment.
POWEROUTLET: An outlet used for connecting electrical devices requiring power.
DATAOUTLET: An outlet used for connecting data communications equipment.
TELEPHONEOUTLET: An outlet used for connecting telephone communications equipment.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 2810;IfcElectricApplianceTypeEnum;"

The IfcElectricApplianceTypeEnum defines the range of different types of electrical appliance that can be specified.

HISTORY: New type in IFC R2.0. Renamed from IfcElectricalApplianceTypeEnum if IFC 2x2.
IFC 2x2 Addendum 1: Missing enumeration values added (ELECTRICHEATER, TUMBLEDRYER and WATERHEATER)
IFC 2x4: ELECTRICHEATER changed to FREESTANDINGELECTRICHEATER and noted as being for occasional use. RADIANTHEATER removed as part of general 'heater consolidation'. WATERHEATER, DIRECTWATERHEATER and INDIRECTWATERHEATER rationalized to FREESTANDINGWATERHEATER. WATERCOOLER changed to FREESTANDINGWATERCOOLER.
COMPUTER, FACSIMILE (FAX), PRINTER, SCANNER, TELEPHONE, TV (TELEVISION) moved to IfcAudioVisualApplianceTypeEnum and IfcCommunicationsApplianceTypeEnum. KITCHENMACHINE added.

Enumeration

DISHWASHER: An appliance that has the primary function of washing dishes.
ELECTRICCOOKER: An electrical appliance that has the primary function of cooking food (including oven, hob, grill).
FREESTANDINGELECTRICHEATER: An electrical appliance that is used occasionally to provide heat. A freestanding electric heater is a 'plugged' appliance whose load may be removed from an electric circuit.
FREESTANDINGFAN: An electrical appliance that is used occasionally to provide ventilation. A freestanding fan is a 'plugged' appliance whose load may be removed from an electric circuit.
FREESTANDINGWATERHEATER: A small, local electrical appliance for heating water. A freestanding water heater is a 'plugged' appliance whose load may be removed from an electric circuit.
FREESTANDINGWATERCOOLER: A small, local electrical appliance for cooling water. A freestanding water cooler is a 'plugged' appliance whose load may be removed from an electric circuit.
FREEZER: An electrical appliance that has the primary function of storing food at temperatures below the freezing point of water.
FRIDGE_FREEZER: An electrical appliance that combines the functions of a freezer and a refrigerator through the provision of separate compartments.
KITCHENMACHINE: A specialized appliance used in commercial kitchens such as a mixer.
HANDDRYER: An electrical appliance that has the primary function of drying hands.
MICROWAVE: An electrical appliance that has the primary function of cooking food using microwaves.
PHOTOCOPIER: A machine that has the primary function of reproduction of printed matter.
REFRIGERATOR: An electrical appliance that has the primary function of storing food at low temperature but above the freezing point of water.
TUMBLEDRYER: An electrical appliance that has the primary function of drying clothes.
VENDINGMACHINE: An appliance that stores and vends goods including food, drink and goods of various types.
WASHINGMACHINE: An appliance that has the primary function of washing clothes.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 2832;IfcLightFixtureTypeEnum;"

The IfcLightFixtureTypeEnum defines the range of different types of light fixture available.

HISTORY: New type in IFC 2x Edition 2
IFC 2x4: SECURITYLIGHTING added

Enumeration

POINTSOURCE: A light fixture that is considered to have negligible area and that emit light with approximately equal intensity in all directions. A light fixture containing a tungsten, halogen or similar bulb is an example of a point source.
DIRECTIONSOURCE: A light fixture that is considered to have a length or surface area from which it emits light in a direction. A light fixture containing one or more fluorescent lamps is an example of a direction source.
SECURITYLIGHTING: A light fixture having specific purpose of directing occupants in an emergency, such as an illuminated exit sign or emergency flood light.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 2841;IfcLampTypeEnum;"

The IfcLampTypeEnum defines the range of different types of lamp available.

HISTORY: New type in IFC 2x2 Addendum 1

Enumeration

COMPACTFLUORESCENT: A fluorescent lamp having a compact form factor produced by shaping the tube.
FLUORESCENT: A typically tubular discharge lamp in which most of the light is emitted by one or several layers of phosphors excited by ultraviolet radiation from the discharge.
HALOGEN: an incandescent lamp in which a tungsten filament is sealed into a compact transport envelope filled with an inert gas and a small amount of halogen such as iodine or bromine.
HIGHPRESSUREMERCURY: A discharge lamp in which most of the light is emitted by exciting mercury at high pressure.
HIGHPRESSURESODIUM: A discharge lamp in which most of the light is emitted by exciting sodium at high pressure.
LED: a solid state lamp that uses light-emitting diodes as the source of light.
METALHALIDE: A discharge lamp in which most of the light is emitted by exciting a metal halide.
OLED: a solid state lamp that uses light-emitting diodes as the source of light whose emissive electroluminescent layer is composed of a film of organic compounds.
TUNGSTENFILAMENT: A lamp that emits light by passing an electrical current through a tungsten wire filament in a near vacuum.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 2856;IfcAudioVisualApplianceTypeEnum;"

Defines the range of different types of audio-video devices that can be specified.

HISTORY: New enumeration in IFC2x4

AMPLIFIER: A device that receives an audio signal and amplifies it to play through speakers.
CAMERA: A device that records images, either as a still photograph or as moving images known as videos or movies. Note that a camera may operate with light from the visible spectrum or from other parts of the electromagnetic spectrum such as infrared or ultraviolet.
DISPLAY: An electronic device that represents information in visual form such as a flat-panel display or television.
MICROPHONE: An acoustic-to-electric transducer or sensor that converts sound into an electrical signal. Microphones types in use include electromagnetic induction (dynamic microphones), capacitance change (condenser microphones) or piezoelectric generation to produce the signal from mechanical vibration.
PLAYER: A device that plays audio and/or video content directly or to another device, having fixed or removable storage media.
PROJECTOR: An apparatus for projecting a picture on a screen. Whether the device is an overhead, slide projector, or a film projector, it is usually referred to as simply a projector.
RECEIVER: A device that receives audio and/or video signals, switches sources, and amplifies signals to play through speakers.
SPEAKER: A loudspeaker, speaker, or speaker system is an electroacoustical transducer that converts an electrical signal to sound.
SWITCHER: A device that receives audio and/or video signals, switches sources, and transmits signals to downstream devices.
TELEPHONE: A telecommunications device that is used to transmit and receive sound, and optionally video.
TUNER: An electronic receiver that detects, demodulates, and amplifies transmitted signals.

" 2873;IfcCommunicationsApplianceTypeEnum;"

Defines the range of different types of communications appliance that can be specified.

HISTORY: New enumeration in IFC2x4

ANTENNA: A transducer designed to transmit or receive electromagnetic waves.
COMPUTER: A desktop, laptop, PDA or other type of computer that can be moved from one place to another and connected to an electrical supply via a plugged outlet.
FAX: A machine that has the primary function of transmitting a facsimile copy of printed matter using a telephone line.
GATEWAY: A gateway connects multiple network segments with different protocols at all layers (layers 1-7) of the OSI model
MODEM: A modem (from modulator-demodulator) is a device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information
NETWORKAPPLIANCE: A network appliance performs a dedicated function such as firewall protection, content filtering, load balancing, or equipment management.
NETWORKBRIDGE: A network bridge connects multiple network segments at the data link layer (layer 2) of the OSI model, and the term layer 2 switch is very often used interchangeably with bridge
NETWORKHUB: A network hub connects multiple network segments at the physical layer (layer 1) of the OSI model.
PRINTER: A machine that has the primary function of printing text and/or graphics onto paper or other media.
REPEATER: A repeater is an electronic device that receives a signal and retransmits it at a higher level and/or higher power, or onto the other side of an obstruction, so that the signal can cover longer distances without degradation.
ROUTER: A router is a networking device whose software and hardware are usually tailored to the tasks of routing and forwarding information. For example, on the Internet, information is directed to various paths by routers.
SCANNER: A machine that has the primary function of scanning the content of printed matter and converting it to digital format that can be stored in a computer.

" 2891;IfcSwitchingDeviceTypeEnum;"

The IfcSwitchingDeviceTypeEnum defines the range of different types of switch that can be specified.

HISTORY: New type in IFC 2x2

Enumeration

CONTACTOR: An electrical device used to control the flow of power in a circuit on or off.
DIMMERSWITCH: A dimmer switch has variable positions, and may adjust electrical power or other setting (according to the switched port type).
EMERGENCYSTOP: An emergency stop device acts to remove as quickly as possible any danger that may have arisen unexpectedly.
KEYPAD: A set of buttons or switches, each potentially applicable to a different device.
MOMENTARYSWITCH: A momentary switch has no position, and may trigger some action to occur.
SELECTORSWITCH: A selector switch has multiple positions, and may switch connectivity or other setting.
STARTER: A starter is a switch which in the closed position controls the application of power to an electrical device.
SWITCHDISCONNECTOR: A switch disconnector is a switch which in the open position satisfies the isolating requirements specified for a disconnector.
SELECTORSWITCH: A selector switch has multiple positions, and may change the source or level of power or other setting (according to the switched port type).
TOGGLESWITCH: A toggle switch has two positions, and may enable or isolate electrical power or other setting (according to the switched port type).
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 2906;IfcElectricTimeControlTypeEnum;"

The IfcElectricTimeControlTypeEnum defines the range of types of electrical time control available.

HISTORY: New type in IFC 2x2

Enumeration

TIMECLOCK: A control that causes action to occur at set times.
TIMEDELAY: A control that causes action to occur following a set duration.
RELAY: Electromagnetically operated contactor for making or breaking a control circuit.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 2915;IfcProtectiveDeviceTypeEnum;"

The IfcProtectiveDeviceTypeEnum specifically defines the range of different breaker unit types that can be used in conjunction with protective device. Types may also be used as a reference to a complete protective device in circumstances where tripping units are not separately identified (typically expected to be the case during earlier stages of design).

HISTORY: New type in IFC 2x2. Modified definition and usage in IFC 2x4

Enumeration

FUSEDISCONNECTOR: A device that will electrically open the circuit after a period of prolonged, abnormal current flow.
CIRCUITBREAKER: A mechanical switching device capable of making, carrying, and breaking currents under normal circuit conditions and also making, carrying for a specified time and breaking, current under specified abnormal circuit conditions such as those of short circuit.
EARTHINGSWITCH: A safety device used to open or close a circuit when there is no current. Used to isolate a part of a circuit, a machine, a part of an overhead line or an underground line so that maintenance can be safely conducted.
EARTHLEAKAGECIRCUITBREAKER: A device that opens, closes, or isolates a circuit and has short circuit protection but no overload protection. It attempts to break the circuit when there is a leakage of current from phase to earth, by measuring voltage on the earth conductor.
RESIDUALCURRENTCIRCUITBREAKER: A device that opens, closes, or isolates a circuit and has short circuit and overload protection. It attempts to break the circuit when there is a difference in current between any two phases. May also be referred to as 'Ground Fault Interupter (GFI)' or 'Ground Fault Circuit Interuptor (GFCI)'
RESIDUALCURRENTSWITCH: A device that opens, closes or isolates a circuit and has no short circuit or overload protection. May also be identified as a 'ground fault switch'.
VARISTOR: A high voltage surge protection device.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 2928;IfcElectricDistributionBoardTypeEnum;"

The IfcElectricDistributionBoardTypeEnum defines the range of different types and/or functions of electric distribution board possible.

HISTORY: New type in IFC 2x4. Replaces IfcElectricDistributionPointTypeEnum

Enumeration

CONSUMERUNIT: A distribution point on the incoming electrical supply, typically in domestic premises, at which protective devices are located.
DISTRIBUTIONBOARD: A distribution point at which connections are made for distribution of electrical circuits usually through protective devices.
MOTORCONTROLCENTRE: A distribution point at which starting and control devices for major plant items are located.
SWITCHBOARD: A distribution point at which switching devices are located.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 2938;IfcCableCarrierFittingTypeEnum;"

The IfcCableCarrierFittingTypeEnum defines the range of different types of cable carrier fitting that can be specified.

HISTORY: New type in IFC 2x2

Enumeration

BEND: A fitting that changes the route of the cable carrier.
CROSS: A fitting at which two branches are taken from the main route of the cable carrier simultaneously.
REDUCER: A fitting that changes the physical size of the main route of the cable carrier.
TEE: A fitting at which a branch is taken from the main route of the cable carrier.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 2948;IfcJunctionBoxTypeEnum;"

The IfcJunctionBoxTypeEnum defines the range of types of junction boxes available.

HISTORY: New type in IFC 2x2. Values added in IFC 2x4.

POWER: Contains cables, outlets, and/or switches for electrical power.
DATA: Contains cables, outlets, and/or switches for communications use.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 2956;IfcCableFittingTypeEnum;"

The IfcCableFittingTypeEnum defines the range of different types of cable fitting that can be specified.

HISTORY: New type in IFC 2x4

Enumeration

CONNECTOR: A fitting that joins two cable segments of the same connector type (though potentially different gender).
ENTRY: A fitting that begins a cable segment at a non-electrical element such as a grounding clamp attached to a pipe.
EXIT: A fitting that ends a cable segment at a non-electrical element such as a grounding clamp attached to a pipe or to the ground.
JUNCTION: A fitting that joins three or more segments of arbitrary connector types for signal splitting or multiplexing.
TRANSITION: A fitting that joins two cable segments of different connector types.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 2967;IfcElectricFlowStorageDeviceTypeEnum;"

The IfcElectricFlowStorageDeviceTypeEnum defines the range of different types of electrical flow storage device available.

HISTORY: New type in IFC 2x2

Enumeration

BATTERY: A device for storing energy in chemical form so that it can be released as electrical energy.
CAPACITORBANK: A device that stores electrical energy when an external power supply is present using the electrical property of capacitance
HARMONICFILTER: A device that constantly injects currents that precisely correspond to the harmonic components drawn by the load.
UPS: A device that provides a time limited alternative source of power supply in the event of failure of the main supply.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 2978;IfcCableSegmentTypeEnum;"

The IfcCableSegmentTypeEnum defines the range of different types of cable segment that can be specified.

HISTORY: New type in IFC 2x2. Core and busbar segment added in IFC 2x4.

Enumeration

BUSBARSEGMENT: Electrical conductor that makes a common connection between several electrical circuits. Properties of a busbar are the same as those of a cable segment and are captured by the cable segment property set.
CABLESEGMENT: Cable with a specific purpose to lead electric current within a circuit or any other electric construction. Includes all types of electric cables, mainly several core segments or conductor segments wrapped together.
CONDUCTORSEGMENT: A single linear element within a cable or an exposed wire (such as for grounding) with the specific purpose to lead electric current, data, or a telecommunications signal.
CORESEGMENT: A self contained element of a cable that comprises one or more conductors and sheathing.The core of one lead is normally single wired or multiwired which are intertwined.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 2988;IfcCableCarrierSegmentTypeEnum;"

The IfcCableCarrierSegmentTypeEnum defines the range of different types of cable carrier segment that can be specified.

HISTORY: New type in IFC 2x2

Enumeration

CABLELADDERSEGMENT: An open carrier segment on which cables are carried on a ladder structure.
CABLETRAYSEGMENT: A (typically) open carrier segment onto which cables are laid.
CABLETRUNKINGSEGMENT: An enclosed carrier segment with one or more compartments into which cables are placed.
CONDUITSEGMENT: An enclosed tubular carrier segment through which cables are pulled.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 2998;IfcProtectiveDeviceTrippingUnitTypeEnum;"

Defines the range of different tripping unit types that can be used in conjunction with a protective device.

HISTORY: New enumeration in IFC2x4

ELECTRONIC: A tripping unit activated by electronic action.
ELECTROMAGNETIC: A tripping unit activated by electromagnetic action.
RESIDUALCURRENT: A tripping unit activated by residual current detection.
THERMAL: A tripping unit activated by thermal action.

" 3073;IfcTransformerTypeEnum;"

The IfcTransformerTypeEnum defines the range of different types of transformer that can be specified.

HISTORY: New type in IFC 2x2

Enumeration

CURRENT: A transformer that changes the current between circuits.
FREQUENCY: A transformer that changes the frequency between circuits.
INVERTER: A transformer that converts from direct current (DC) to alternating current (AC).
RECTIFIER: A transformer that converts from alternating current (AC) to direct current (DC).
VOLTAGE: A transformer that changes the voltage between circuits.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 3085;IfcElectricGeneratorTypeEnum;"

The IfcElectricGeneratorTypeEnum defines the range of types of electric generators available.

HISTORY: New type in IFC 2x2. Values added in IFC 2x4.

Enumeration

CHP: Combined heat and power supply, used not only as a source of electric energy but also as a heating source for the building. It may therefore be not only part of an electrical system but also of a heating system.
ENGINEGENERATOR: Electrical generator with a fuel-driven engine, for example a diesel-driven emergency power supply.
STANDALONE: Electrical generator which does not include its source of kinetic energy, that is, a motor, engine, or turbine is modeled by a separate object.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 3095;IfcElectricMotorTypeEnum;"

The IfcElectricMotorTypeEnum defines the range of different types of electric motor that can be specified.

HISTORY: New type in IFC 2x2

Enumeration

DC: A motor using either generated or rectified D.C. power.
INDUCTION: An alternating current motor in which the primary winding on one member (usually the stator) is connected to the power source and a secondary winding or a squirrel-cage secondary winding on the other member (usually the rotor) carries the induced current. There is no physical electrical connection to the secondary winding, its current is induced.
POLYPHASE: A two or three-phase induction motor in which the windings, one for each phase, are evenly divided by the same number of electrical degrees.
RELUCTANCESYNCHRONOUS: A synchronous motor with a special rotor design which directly lines the rotor up with the rotating magnetic field of the stator, allowing for no slip under load.
SYNCHRONOUS: A motor that operates at a constant speed up to full load. The rotor speed is equal to the speed of the rotating magnetic field of the stator; there is no slip.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 3107;IfcMotorConnectionTypeEnum;"

The IfcMotorConnectionTypeEnum defines the range of different types of motor connection that can be specified.

HISTORY: New type in IFC 2x.

Enumeration

BELTDRIVE: An indirect connection made through the medium of a shaped, flexible continuous loop.
COUPLING: An indirect connection made through the medium of the viscosity of a fluid.
DIRECTDRIVE: A direct, physical connection made between the motor and the driven device.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 3117;IfcSolarDeviceTypeEnum;"

The IfcSolarDeviceTypeEnum defines the range of types of solar devices available.

HISTORY: New type in IFC 2x4.

Enumeration

SOLARCOLLECTOR: A device that converts solar radiation into thermal energy (heating water, etc.).
SOLARPANEL: A device that converts solar radiation into electric current.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 3142;IfcAirToAirHeatRecoveryTypeEnum;"

Defines general types of pumps. The IfcPumpTypeEnum contains the following:

FIXEDPLATECOUNTERFLOWEXCHANGER: Heat exchanger with moving parts and alternate layers of plates, separated and sealed from the exhaust and supply air stream passages with primary air enters at secondary air outlet location and exits at secondary air inlet location.
FIXEDPLATECROSSFLOWEXCHANGER: Heat exchanger with moving parts and alternate layers of plates, separated and sealed from the exhaust and supply air stream passages with secondary air flow in the direction perpendicular to primary air flow.
FIXEDPLATEPARALLELFLOWEXCHANGER: Heat exchanger with moving parts and alternate layers of plates, separated and sealed from the exhaust and supply air stream passages with primary air enters at secondary air inlet location and exits at secondary air outlet location.
ROTARYWHEEL: A heat wheel with a revolving cylinder filled with an air-permeable medium having a large internal surface area.
RUNAROUNDCOILLOOP: A typical coil energy recovery loop places extended surface, finned tube water coils in the supply and exhaust airstreams of a building.
HEATPIPE: A passive energy recovery device with a heat pipe divided into evaporator and condenser sections.
TWINTOWERENTHALPYRECOVERYLOOPS: An air-to-liquid, liquid-to-air enthalpy recovery system with a sorbent liquid circulates continuously between supply and exhaust airstreams, alternately contacting both airstreams directly in contactor towers.
THERMOSIPHONSEALEDTUBEHEATEXCHANGERS: Sealed systems that consist of an evaporator, a condenser, interconnecting piping, and an intermediate working fluid that is present in both liquid and vapor phases where the evaporator and the condenser are usually at opposite ends of a bundle of straight, individual thermosiphon tubes and the exhaust and supply ducts are adjacent to each other.
THERMOSIPHONCOILTYPEHEATEXCHANGERS: Sealed systems that consist of an evaporator, a condenser, interconnecting piping, and an intermediate working fluid that is present in both liquid and vapor phases where the evaporator and condensor coils are installed independently in the ducts and are interconnected by the working fluid piping.
USERDEFINED: User-defined air to air heat recovery type.
NOTDEFINED: Undefined air to air heat recovery type.

HISTORY: New enumeration in IFC R2x.

" 3157;IfcBoilerTypeEnum;"

Enumeration defining the typical types of boilers. The IfcBoilerTypeEnum contains the following:

WATER: Water boiler.
STEAM: Steam boiler.
USERDEFINED: User-defined Boiler type.
NOTDEFINED: Undefined Boiler type.

HISTORY: New enumeration in IFC R2x.

" 3165;IfcBurnerTypeEnum;"

Enumeration defining the functional type of burner. The IfcBurnerTypeEnum contains the following:

USERDEFINED: User-defined burner type.
NOTDEFINED: Undefined burner type.

HISTORY: New enumeration in IFC R2x4.

" 3171;IfcChillerTypeEnum;"

Enumeration defining the typical types of Chillers classified by their method of heat rejection. The IfcChillerTypeEnum contains the following:

AIRCOOLED: Air cooled chiller.
WATERCOOLED: Water cooled chiller.
HEATRECOVERY: Heat recovery chiller.
USERDEFINED: User-defined chiller type.
NOTDEFINED: Undefined chiller type.

HISTORY: New enumeration in IFC R2x.

" 3180;IfcCoilTypeEnum;"

Enumeration defining the typical types of coils. The IfcCoilTypeEnum contains the following:

DXCOOLINGCOIL: Cooling coil using a refrigerant to cool the air stream directly.
WATERCOOLINGCOIL: Cooling coil using chilled water. HYDRONICCOIL supercedes this enumerator.
STEAMHEATINGCOIL: Heating coil using steam as heating source.
WATERHEATINGCOIL: Heating coil using hot water as a heating source. HYDRONICCOIL supercedes this enumerator.
ELECTRICHEATINGCOIL: Heating coil using electricity as a heating source.
GASHEATINGCOIL: Heating coil using gas as a heating source.
HYDRONICCOIL: Cooling or Heating coil that uses a hydronic fluid as a cooling or heating source.
USERDEFINED: User-defined coil type.
NOTDEFINED: Undefined coil type.

HISTORY: New enumeration in IFC R2x.

" 3193;IfcCondenserTypeEnum;"

Enumeration defining the typical types of condensers. Air is used as the cooling medium for AIRCOOLED; water is used as the cooling medium for all other types. The IfcCondenserTypeEnum contains the following:

AIRCOOLED: A condenser in which heat is transferred to an air-stream.
EVAPORATIVECOOLED: A condenser that is cooled evaporatively.
WATERCOOLED: Water-cooled condenser with unspecified operation.
WATERCOOLEDSHELLTUBE: Water-cooled condenser with cooling water circulated through one or more tubes contained within the shell.
WATERCOOLEDSHELLCOIL: Water-cooled condenser with cooling water circulated through one or more continuous or assembled coils contained within the shell.
WATERCOOLEDTUBEINTUBE: Water-cooled condenser consisting of one or more assemblies of two tubes, one within the other.
WATERCOOLEDBRAZEDPLATE: Water-cooled condenser condenser with plates brazed together to form an assembly of separate channels.
USERDEFINED: User-defined condenser type.
NOTDEFINED: Undefined condenser type.

HISTORY: New enumeration in IFC 2x2. WATERCOOLED added in IFC 2x4.

" 3206;IfcCooledBeamTypeEnum;"

There are two general types of cooled or chilled beams: passive and active. An active Cooled Beam uses a fan or other auxilliary device to aid in air recirculation, while a passive Cooled Beam relies solely on convection to cool the space.

Enumeration defining the typical types of cooled beams. The IfcCooledBeamTypeEnum contains the following:

ACTIVE: An active or ventilated cooled beam provides cooling (and heating) but can also function as an air terminal in a ventilation system.
PASSIVE: A passive or static cooled beam provides cooling (and heating) to a room or zone.
USERDEFINED: User-defined cooled beam type.
NOTDEFINED: Undefined cooled beam type.

HISTORY: New enumeration in IFC 2x2.

" 3214;IfcCoolingTowerTypeEnum;"

Enumeration defining the typical types of cooling towers. The IfcCoolingTowerTypeEnum contains the following:

NATURALDRAFT: Air flow is produced naturally.
MECHANICALINDUCEDDRAFT: Air flow is produced by a mechanical device, typically one or more fans, located on the air outlet side of the cooling tower.
MECHANICALFORCEDDRAFT: Air flow is produced by a mechanical device, typically one or more fans, located on the inlet air side of the cooling tower.
USERDEFINED: User-defined cooling tower type.
NOTDEFINED: Undefined cooling tower type.

HISTORY: New enumeration in IFC R2x.

" 3223;IfcEvaporativeCoolerTypeEnum;"

Enumeration defining the typical types of evaporative coolers. The IfcEvaporativeCoolerTypeEnum contains the following:

DIRECTEVAPORATIVERANDOMMEDIAAIRCOOLER: Direct evaporative random media air cooler: Cools the air stream by evaporating water dircectly into the air stream using coolers with evaporative pads, usually of aspen wood or plastic fiber/foam.
DIRECTEVAPORATIVERIGIDMEDIAAIRCOOLER: Direct evaporative rigid media air cooler: Cools the air stream by evaporating water dircectly into the air stream using coolers with sheets of rigid, corrugated material as the wetted surface.
DIRECTEVAPORATIVESLINGERSPACKAGEDAIRCOOLER: Direct evaporative slingers packaged air cooler: Cools the air stream by evaporating water dircectly into the air stream using coolers with a water slinger in an evaporative cooling section and a fan section.
DIRECTEVAPORATIVEPACKAGEDROTARYAIRCOOLER: Direct evaporative packaged rotary air cooler: Cools the air stream by evaporating water dircectly into the air stream using coolers that wet and wash the evaporative pad by rotating it through a water bath.
DIRECTEVAPORATIVEAIRWASHER: Direct evaporative air washer: Cools the air stream by evaporating water dircectly into the air stream using coolers with spray-type air washer consist of a chamber or casing containing spray nozzles, and tank for collecting spray water, and an eliminator section for removing entrained drops of water from the air.
INDIRECTEVAPORATIVEPACKAGEAIRCOOLER: Indirect evaporative package air cooler: Cools the air stream by evaporating water indirectly and without adding moisture into the air stream. On one side of the heat exchanger, the secondary air stream is cooled by evaporation, while on the other side of heat exchanger, the primary air stream (conditioned air to be supplied to the room) is sensibly cooled by the heat exchanger surfaces.
INDIRECTEVAPORATIVEWETCOIL: Indirect evaporative wet coil: Cools the air stream by evaporating water indirectly and without adding moisture into the air stream. Water is sprayed directly on the tubes of the heat exchanger where latent cooling takes place and the vaporization of the water on the outside of the heat exchanger tubes allows the simultaneous heat and mass transfer which removes heat from the supply air on the tube side.
INDIRECTEVAPORATIVECOOLINGTOWERORCOILCOOLER: Indirect evaporative cooling tower or coil cooler: Cools the air stream by evaporating water indirectly and without adding moisture into the air stream using a combination of a cooling tower or other evaporative water cooler with a water-to-air heat exchanger coil and water circulating pump.
INDIRECTDIRECTCOMBINATION: Indirect/Direct combination: Cools the air stream by evaporating water indirectly and without adding moisture into the air stream using a two-stage cooler with a first-stage indirect evaporative cooler and second-stage direct evaporative cooler.
USERDEFINED: User-defined evaporative cooler type.
NOTDEFINED: Undefined evaporative cooler type.

HISTORY: New enumeration in IFC 2x2.

" 3238;IfcEvaporatorTypeEnum;"

Enumeration defining the typical types of evaporators. The IfcEvaporatorTypeEnum contains the following:

DIRECTEXPANSION: Direct-expansion evaporator.
DIRECTEXPANSIONSHELLANDTUBE: Direct-expansion evaporator where a refrigerant evaporates inside a series of baffles that channel the fluid throughout the shell side.
DIRECTEXPANSIONTUBEINTUBE: Direct-expansion evaporator where a refrigerant evaporates inside one or more pairs of coaxial tubes.
DIRECTEXPANSIONBRAZEDPLATE: Direct-expansion evaporator where a refrigerant evaporates inside plates brazed or welded together to make up an assembly of separate channels.
FLOODEDSHELLANDTUBE: Evaporator in which refrigerant evaporates outside tubes.
SHELLANDCOIL: Evaporator in which refrigerant evaporates inside a simple coiled tube immersed in the fluid to be cooled.
USERDEFINED: User-defined evaporator type.
NOTDEFINED: Undefined evaporator type.

HISTORY: New enumeration in IFC 2x2.

" 3250;IfcHeatExchangerTypeEnum;"

Enumeration defining the typical types of heat exchangers. The IfcHeatExchangerTypeEnum contains the following:

PLATE: Plate heat exchanger.
SHELLANDTUBE: Shell and Tube heat exchanger.
USERDEFINED: User-defined heat exchanger type.
NOTDEFINED: Undefined heat exchanger type.

HISTORY: New enumeration in IFC R2x.

" 3258;IfcHumidifierTypeEnum;"

Enumeration defining the typical types of humidifiers. The IfcHumidifierTypeEnum contains the following:

STEAMINJECTION: Water vapor is added into the airstream through direction steam injection.
ADIABATICAIRWASHER: Water vapor is added into the airstream through adiabatic evaporation using an air washing element.
ADIABATICPAN: Water vapor is added into the airstream through adiabatic evaporation using a pan.
ADIABATICWETTEDELEMENT: Water vapor is added into the airstream through adiabatic evaporation using a wetted element.
ADIABATICATOMIZING: Water vapor is added into the airstream through adiabatic evaporation using an atomizing element.
ADIABATICULTRASONIC: Water vapor is added into the airstream through adiabatic evaporation using an ultrasonic element.
ADIABATICRIGIDMEDIA: Water vapor is added into the airstream through adiabatic evaporation using a rigid media.
ADIABATICCOMPRESSEDAIRNOZZLE: Water vapor is added into the airstream through adiabatic evaporation using a compressed air nozzle.
ASSISTEDELECTRIC: Water vapor is added into the airstream through water heated evaporation using an electric heater.
ASSISTEDNATURALGAS: Water vapor is added into the airstream through water heated evaporation using a natural gas heater.
ASSISTEDPROPANE: Water vapor is added into the airstream through water heated evaporation using a propane heater.
ASSISTEDBUTANE: Water vapor is added into the airstream through water heated evaporation using a butane heater.
ASSISTEDSTEAM: Water vapor is added into the airstream through water heated evaporation using a steam heater.
USERDEFINED: User-defined humidifier type.
NOTDEFINED: Undefined humidifier type.

HISTORY: New enumeration in IFC 2x2.

" 3277;IfcTubeBundleTypeEnum;"

Enumeration defining the typical types of tube bundles. The IfcTubeBundleTypeEnum contains the following:

FINNED: Finned tube bundle type.
USERDEFINED: User-defined tube bundle type.
NOTDEFINED: Undefined tube bundle type.

HISTORY: New enumeration in IFC 2x2.

" 3284;IfcUnitaryEquipmentTypeEnum;"

Enumeration defining the functional type of unitary equipment. The IfcUnitaryEquipmentTypeEnum contains the following:

AIRHANDLER: A unitary air handling unit typically containing a fan, economizer, and coils.
AIRCONDITIONINGUNIT: A unitary packaged air-conditioning unit typically used in residential or light commercial applications.
DEHUMIDIFIER: A unitary packaged dehumidification unit. Note: units supporting multiple modes (dehumidification, cooling, and/or heating) should use AIRCONDITIONINGUNIT.
SPLITSYSTEM: A system which separates the compressor from the evaporator, but acts as a unitary component typically within residential or light commercial applications.
ROOFTOPUNIT: A packaged assembly that is either field-erected or manufactured atop the roof of a large residential or commercial building and acts as a unitary component.
USERDEFINED: User-defined unitary equipment type.
NOTDEFINED: Undefined unitary equipment type.

HISTORY: New enumeration in IFC R2x. DEHUMIDIFIER added in IFC 2x4

" 3295;IfcEngineTypeEnum;"

Enumeration defining the typical types of engines. The IfcEngineTypeEnum contains the following:

EXTERNALCOMBUSTION: Combustion is external.
INTERNALCOMBUSTION: Combustion is internal.
USERDEFINED: User-defined engine type.
NOTDEFINED: Undefined engine type.

HISTORY: New enumeration in IFC 2x4.

" 3303;IfcFanTypeEnum;"

Enumeration defining the typical types of fans. The IfcFanTypeEnum contains the following:

CENTRIFUGALFORWARDCURVED: Air flows through the impeller radially using blades that are forward curved.
CENTRIFUGALRADIAL: Air flows through the impeller radially using blades that are uncurved or slightl forward curved.
CENTRIFUGALBACKWARDINCLINEDCURVED: Air flows through the impeller radially using blades that are backward curved.
CENTRIFUGALAIRFOIL: Air flows through the impeller radially using blades are airfoil shaped.
TUBEAXIAL: Air flows through the impeller axially with reduced tip clearance and operating at higher tip speeds.
VANEAXIAL: Air flows through the impeller axially with guide vanes and reduced running blade tip clearance.
PROPELLORAXIAL: Air flows through the impeller axially and small hub-to-tip ratio impeller mounted in an orifice plate or inlet ring.
USERDEFINED: User-defined fan type.
NOTDEFINED: Undefined fan type.

HISTORY: New enumeration in IFC 2x2.

" 3316;IfcCompressorTypeEnum;"

Types of compressors. The IfcCompressorTypeEnum contains the following:

DYNAMIC: The pressure of refrigerant vapor is increased by a continuous transfer of angular momentum from a rotating member to the vapor followed by conversion of this momentum into static pressure.
RECIPROCATING: Positive-displacement compressor using a piston driven by a connecting rod from a crankshaft.
ROTARY: Positive-displacement compressor using a roller or rotor device.
SCROLL: Positive-displacement compressor using two inter-fitting, spiral-shaped scroll members.
TROCHOIDAL: Positive-displacement compressor using a rolling motion of one circle outside or inside the circumference of a basic circle and produce either epitrochoids or hypotrochoids.
SINGLESTAGE: Positive-displacement reciprocating compressor where vapor is compressed in a single stage.
BOOSTER: Positive-displacement reciprocating compressor where pressure is increased by a booster.
OPENTYPE: Positive-displacement reciprocating compressor where the shaft extends through a seal in the crankcase for an external drive.
HERMETIC: Positive-displacement reciprocating compressor where the motor and compressor are contained within the same housing, with the motor shaft integral with the compressor crankshaft and the motor in contact with refrigerant.
SEMIHERMETIC: Positive-displacement reciprocating compressor where the hermetic compressors use bolted construction amenable to field repair.
WELDEDSHELLHERMETIC: Positive-displacement reciprocating compressor where the motor compressor is mounted inside a steel shell, which, in turn is sealed by welding.
ROLLINGPISTON: Positive-displacement rotary compressor using a roller mounted on the eccentric of a shaft with a single vane in the nonrotating cylindrical housing.
ROTARYVANE: Positive-displacement rotary compressor using a roller mounted on the eccentric of a shaft with multiple vanes in the nontotating cylindrical housing.
SINGLESCREW: Positive-displacement rotary compressor using a single cylindrical main rotor that works with a pair of gate rotors.
TWINSCREW: Positive-displacement rotary compressor using two mating helically grooved rotors, male (lobes) and female (flutes) in a stationary housing with inlet and outlet gas ports.
USERDEFINED: User-defined compressor type.
NOTDEFINED: Undefined compressor type.

HISTORY: New enumeration in IFC R2x.

" 3337;IfcPumpTypeEnum;"

Defines general types of pumps. The IfcPumpTypeEnum contains the following:

CIRCULATOR: A Circulator pump is a generic low-pressure, low-capacity pump. It may have a wet rotor and may be driven by a flexible-coupled motor.
ENDSUCTION: An End Suction pump, when mounted horizontally, has a single horizontal inlet on the impeller suction side and a vertical discharge. It may have a direct or close-coupled motor.
SPLITCASE: A Split Case pump, when mounted horizontally, has an inlet and outlet on each side of the impeller. The impeller can be easily accessed by removing the front of the impeller casing. It may have a direct or close-coupled motor.
SUBMERSIBLEPUMP: A pump designed to be immersed in a fluid, typically a collection tank.
SUMPPUMP: A pump designed to sit above a collection tank with a suction inlet extending into the tank.
VERTICALINLINE: A Vertical Inline pump has the pump and motor close-coupled on the pump casing. The pump depends on the connected, horizontal piping for support, with the suction and discharge along the piping axis.
VERTICALTURBINE: A Vertical Turbine pump has a motor mounted vertically on the pump casing for either wet-pit sump mounting or dry-well mounting.
USERDEFINED: User-defined pump type.
NOTDEFINED: Pump type has not been defined.

HISTORY: New enumeration in IFC R2x. SUBMERSIBLEPUMP and SUMPPUMP added in IFC2x4.

" 3350;IfcDamperTypeEnum;"

This enumeration defines the various types of damper:

BALANCINGDAMPER: Damper used for purposes of manually balancing pressure differences. Commonly operated by mechanical adjustment.
BACKDRAFTDAMPER: Backdraft damper used to restrict the movement of air in one direction. Commonly operated by mechanical spring.
BLASTDAMPER: Blast damper use to prevent protect occupants and equipment against overpressures resultant of an explosion. Commonly operated by mechanical spring.
CONTROLDAMPER: Control damper used to modulate the flow of air by adjusting the position of the blades. Commonly operated by an actuator of a building automation system.
FIREDAMPER: Fire damper used to prevent the spread of fire for a specified duration. Commonly operated by fusable link that melts above a certain temperature.
FIRESMOKEDAMPER: Combination fire and smoke damper used to preven the spread of fire and smoke. Commonly operated by a fusable link and a smoke detector
FUMEHOODEXHAUST: Fume hood exhaust damper. Commonly operated by actuator.
GRAVITYDAMPER: Gravity damper closes from the force of gravity. Commonly operated by gravitational weight.
GRAVITYRELIEFDAMPER: Gravity-relief damper used to allow air to move upon a buildup of enough pressure to overcome the gravitational force exerted upon the damper blades. Commonly operated by gravitational weight.
RELIEFDAMPER: Relief damper used to allow air to move upon a buildup of a specified pressure differential. Commonly operated by mechanical spring.
SMOKEDAMPER: Smoke damper used to prevent the spread of smoke. Commonly operated by a smoke detector of a building automation system.
USERDEFINED: User-defined damper.
NOTDEFINED: Undefined damper.

HISTORY: New enumeration in IFC R2.0

" 3367;IfcAirTerminalBoxTypeEnum;"

This enumeration identifies different types of air terminal boxes.

Valid enumerations are:

CONSTANTFLOW: Terminal box does not include a means to reset the volume automatically to an outside signal such as thermostat.
VARIABLEFLOWPRESSUREDEPENDANT: terminal box includes a means to reset the volume automatically to a different control point in response to an outside signal such as thermostat: air-flow rate depends on supply pressure.
VARIABLEFLOWPRESSUREINDEPENDANT: terminal box includes a means to reset the volume automatically to a different control point in response to an outside signal such as thermostat: air-flow rate is independant of supply pressure.
USERDEFINED: User-defined terminal box.
NOTDEFINED: Undefined terminal box.

HISTORY: New enumeration in IFC R2.0

" 3376;IfcValveTypeEnum;"

The IfcValveTypeEnum defines the range of different types of valve that can be specified. These are typically used in conjunction with Pset_ValveTypeCommon, which contains common properties for all valve types. The IfcValveTypeEnum contains:

AIRRELEASE: Valve used to release air from a pipe or fitting.
ANTIVACUUM: Valve that opens to admit air if the pressure falls below atmospheric pressure (BS6100 330 4104)
CHANGEOVER: Valve that enables flow to be switched between pipelines (3 or 4 port).
CHECK: Valve that permits water to flow in one direction only and is enclosed when there is no flow (2 port).
COMMISSIONING: Valve used to facilitate commissioning of a system (2 port).
DIVERTING: Valve that enables flow to be diverted from one branch of a pipeline to another (3 port).
DOUBLECHECK: An assembly that incorporates two valves used to prevent backflow (BS6100 330 4106).
DOUBLEREGULATING: Valve used to facilitate regulation of fluid flow in a system.
DRAWOFFCOCK: A valve used to remove fluid from a piping system.
FAUCET: Faucet valve typically used as a flow discharge.
FLUSHING: Valve that flushes a predetermined quantity of water to cleanse a toilet, urinal, etc.
GASCOCK: Valve that is used for controlling the flow of gas.
GASTAP: Gas tap typically used for venting or discharging gas from a system.
ISOLATING: Valve that closes off flow in a pipeline.
MIXING: Valve that enables flow from two branches of a pipeline to be mixed together (3 port).
PRESSUREREDUCING: Valve that reduces the pressure of a fluid immediately downstream of its position in a pipeline to a preselected value or by a predetermined ratio.
PRESSURERELIEF: Spring or weight loaded valve that automatically discharges to a safe place fluid that has built up to excessive pressure in pipes or fittings
REGULATING: Valve used to facilitate regulation of fluid flow in a system.
SAFETYCUTOFF: Valve that closes under the action of a safety mechanism such as a drop weight, solenoid etc.
STEAMTRAP: Valve that restricts flow of steam while allowing condensate to pass through.
STOPCOCK: An isolating valve used on a domestic water service.
USERDEFINED: User-defined valve type.
NOTDEFINED: Undefined valve type.

HISTORY: New type in IFC R2.0

" 3403;IfcFlowMeterTypeEnum;"

This enumeration defines various types of flow meter:

ENERGYMETER: An electric meter or energy meter is a device that measures the amount of electrical energy supplied to or produced by a residence, business or machine.
GASMETER: A device that measures the quantity of a gas or fuel.
OILMETER: A device that measures the quantity of oil.
WATERMETER: A device that measures the quantity of water.
USERDEFINED: User-defined meter type
NOTDEFINED: Undefined meter type

HISTORY: New enumeration in IFC 2x2

" 3413;IfcDuctFittingTypeEnum;"

This enumeration is used to identify the primary purpose of a duct fitting. This is a very basic categorization mechanism to generically identify the duct fitting type. Subcategories of duct fittings are not enumerated. The IfcDuctFittingTypeEnum contains the following:

BEND: A fitting with typically two ports used to change the direction of flow between connected elements.
CONNECTOR: Connector fitting, typically used to join two ports together within a flow distribution system (e.g., a coupling used to join two duct segments).
ENTRY: Entry fitting, typically unconnected at one port and connected to a flow distribution system at the other (e.g., an outside air duct system intake opening).
EXIT: Exit fitting, typically unconnected at one port and connected to a flow distribution system at the other (e.g., an exhaust air discharge opening).
JUNCTION: A fitting with typically more than two ports used to redistribute flow among the ports and/or to change the direction of flow between connected elements (e.g, tee, cross, wye, etc.).
OBSTRUCTION: A fitting with typically two ports used to obstruct or restrict flow between the connected elements (e.g., screen, perforated plate, etc.).
TRANSITION: A fitting with typically two ports having different shapes or sizes. Can also be used to change the direction of flow between connected elements.
USERDEFINED: User-defined fitting.
NOTDEFINED: Undefined fitting.

HISTORY: New enumeration in IFC 2x2

" 3426;IfcPipeFittingTypeEnum;"

This enumeration is used to identify the primary purpose of a pipe fitting. This is a very basic categorization mechanism to generically identify the pipe fitting type. Subcategories of pipe fittings are not enumerated. The IfcpipeFittingTypeEnum contains the following:

BEND: A fitting with typically two ports used to change the direction of flow between connected elements.
CONNECTOR: Connector fitting, typically used to join two ports together within a flow distribution system (e.g., a coupling used to join two pipe segments).
ENTRY: Entry fitting, typically unconnected at one port and connected to a flow distribution system at the other (e.g., a breeching inlet).
EXIT: Exit fitting, typically unconnected at one port and connected to a flow distribution system at the other (e.g., a hose bibb).
JUNCTION: A fitting with typically more than two ports used to redistribute flow among the ports and/or to change the direction of flow between connected elements (e.g, tee, cross, wye, etc.).
OBSTRUCTION: A fitting with typically two ports used to obstruct or restrict flow between the connected elements (e.g., screen, perforated plate, etc.).
TRANSITION: A fitting with typically two ports having different shapes or sizes. Can also be used to change the direction of flow between connected elements.
USERDEFINED: User-defined fitting.
NOTDEFINED: Undefined fitting.

HISTORY: New enumeration in IFC 2x2

" 3439;IfcTankTypeEnum;"

Enumeration defining the typical types of tanks. The IfcTankTypeEnum contains the following:

BASIN: An arbitrary open tank type.
BREAKPRESSURE: An open container that breaks the hydraulic pressure in a distribution system, typically located between the fluid reservoir and the fluid supply points. A typical break pressure tank allows the flow to discharge into the atmosphere, thereby reducing its hydrostatic pressure to zero.
EXPANSION: A closed container used in a closed fluid distribution system to mitigate the effects of thermal expansion or water hammer. The tank is typically constructed with a diaphragm dividing the tank into two sections, with fluid on one side of the diaphragm and air on the other. One example application is when connected to the primary circuit of a hot water system to accommodate the increase in volume of the water when it is heated.
FEEDANDEXPANSION: An open tank that is used for both storage and thermal expansion. A typical example is a tank used to store make-up water at ambient pressure for supply to a hot water system, simultaneously accommodating increases in volume of the water when heated.
PRESSUREVESSEL: A closed container used for storing fluids or gases at a pressure different from the ambient pressure. A pressure vessel is typically rated by an authority having jurisdiction for the operational pressure.
STORAGE: An open or closed containter used for storing a fluid at ambient pressure and from which it can be supplied to the fluid distribution system. There are many examples of storage tanks, such as potable water storage tanks, fuel storage tanks, etc.
VESSEL: An arbitrary closed tank type.
USERDEFINED: User-defined tank type.
NOTDEFINED: Undefined tank type.

HISTORY: New enumeration in IFC 2x2. BASIN and VESSEL added in IFC2x4.

" 3452;IfcDuctSilencerTypeEnum;"

Enumeration defining the typical types of duct silencers. The IfcDuctSilencerTypeEnum contains the following:

FLATOVAL: Flat-oval shaped duct silencer type.
RECTANGULAR: Rectangular shaped duct silencer type.
ROUND: Round duct silencer type.
USERDEFINED: User-defined duct silencer type.
NOTDEFINED: Undefined duct silencer type.

HISTORY: New enumeration in IFC 2x2.

" 3461;IfcFilterTypeEnum;"

This enumeration defines the various types of filter typically used within building services distribution systems:

AIRPARTICLEFILTER: A filter used to remove particulates from air.
COMPRESSEDAIRFILTER: A filter used to remove particulates from compressed air.
ODORFILTER: A filter used to remove odors from air.
OILFILTER: A filter used to remove particulates from oil.
STRAINER: A filter used to remove particulates from a fluid.
WATERFILTER: A filter used to remove particulates from water.
USERDEFINED: User-defined filter type.
NOTDEFINED: Undefined filter type.

HISTORY: New enumeration in IFC R2x. COMPRESSEDAIRFILTER added in IFC2x4.

" 3473;IfcPipeSegmentTypeEnum;"

This enumeration is used to identify the primary purpose of a pipe segment. This is a very basic categorization mechanism to generically identify the pipe segment type. Subcategories of pipe segments are not enumerated. The IfcPipeSegmentTypeEnum contains the following:

CULVERT: A covered channel or large pipe that forms a watercourse below ground level, usually under a road or railway.
RIGIDSEGMENT: A rigid segment is continuous linear segment of pipe that cannot be deformed.
FLEXIBLESEGMENT: A flexible segment is a continuous non-linear segment of pipe that can be deformed and change the direction of flow.
GUTTER: A gutter segment is a continuous open-channel segment of pipe.
SPOOL: A type of rigid segment that is typically shorter and used for providing connectivity within a piping network.
USERDEFINED: User-defined segment.
NOTDEFINED: Undefined segment.

HISTORY: New enumeration in IFC 2x2

" 3484;IfcDuctSegmentTypeEnum;"

This enumeration is used to identify the primary purpose of a duct segment. This is a very basic categorization mechanism to generically identify the duct segment type. Subcategories of duct segments are not enumerated. The IfcDuctSegmentTypeEnum contains the following:

RIGIDSEGMENT: A rigid segment is continuous linear segment of duct that cannot be deformed.
FLEXIBLESEGMENT: A flexible segment is a continuous non-linear segment of duct that can be deformed and change the direction of flow.
USERDEFINED: User-defined segment.
NOTDEFINED: Undefined segment.

HISTORY: New enumeration in IFC 2x2

" 3529;IfcAirTerminalTypeEnum;"

Enumeration defining the functional types of air terminals. The IfcAirTerminalTypeEnum contains the following:

GRILLE: A covering for any area through which air passes.
REGISTER: A grille typically equipped with a damper or control valve.
DIFFUSER: An outlet discharging supply air in various directions and planes.
LOUVRE: A rectilinear louvre.
USERDEFINED: User-defined air terminal type.
NOTDEFINED: Undefined air terminal type.

NOTE: Architectural louvres within doors or windows are defined by IfcPermeableCoveringProperties.

HISTORY: New enumeration in IFC R2x2. Modified in IFC R2x4 to add LOUVRE and remove EYEBALL, IRIS, LINEARGRILLE, LINEARDIFFUSER

" 3540;IfcSpaceHeaterTypeEnum;"

Enumeration defining the functional type of space heater. The IfcSpaceHeaterTypeEnum contains the following:

CONVECTOR: A heat-distributing unit that operates with gravity-circulated air.
RADIATOR: A heat-distributing unit that operates with thermal radiation.
USERDEFINED: User-defined space heater type.
NOTDEFINED: Undefined space heater type.

NOTE: This enumeration was revised in IFC 2x4 and was renamed from IfcHydronicHeaterTypeEnum in IFC R2x.

HISTORY: New enumeration in IFC R2x.

" 3549;IfcMedicalDeviceTypeEnum;"

Enumeration defining the functional type of medical device. The IfcMedicalDeviceTypeEnum contains the following:

AIRSTATION: Device that provides purified medical air, composed of an air compressor and air treatment line.
FEEDERUNIT: Device that feeds air to an oxygen generator, composed of an air compressor, air treatment line, and an air receiver.
OXYGENGENERATOR: Device that generates oxygen from air.
OXYGENPLANT: Device that combines a feed air unit, oxygen generator, and backup oxygen cylinders.
VACUUMSTATION: Device that provides suction, composed of a vacuum pump and bacterial filtration line.
USERDEFINED: User-defined medical device type.
NOTDEFINED: Undefined medical device type.

HISTORY: New enumeration in IFC 2x4.

" 3650;IfcVibrationIsolatorTypeEnum;"

Enumeration defining the typical types of vibration isolators. The IfcVibrationIsolatorTypeEnum contains the following:

COMPRESSION: Compression type vibration isolator.
SPRING: Spring type vibration isolator.
USERDEFINED: User-defined vibration isolator type.
NOTDEFINED: Undefined vibration isolator type.

HISTORY: New enumeration in IFC 2x2.

" 3662;IfcWasteTerminalTypeEnum;"

The IfcWasteTerminalTypeEnum defines the range of different types of waste terminal that can be specified.

HISTORY: New type in IFC 2x2. GREASEINTERCEPTOR, OILINTERCEPTOR, PETROLINTERCEPTOR moved to IfcInterceptorTypeEnum in IFC2x4.

Enumeration

FLOORTRAP: Pipe fitting, set into the floor, that retains liquid to prevent the passage of foul air
FLOOORWASTE: Pipe fitting, set into the floor, that collects waste water and discharges it to a separate trap.
GULLYSUMP: Pipe fitting or assembly of fittings to receive surface water or waste water, fitted with a grating or sealed cover.
GULLYTRAP: Pipe fitting or assembly of fittings to receive surface water or waste water, fitted with a grating or sealed cover and discharging through a trap (BS6100 330 3504 modified).
ROOFDRAIN: Pipe fitting, set into the roof, that collects rainwater for discharge into the rainwater system.
WASTEDISPOSALUNIT: Electrically operated device that reduces kitchen or other waste into fragments small enough to be flushed into a drainage system.
WASTETRAP: Pipe fitting, set adjacent to a sanitary terminal, that retains liquid to prevent the passage of foul air.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 3675;IfcStackTerminalTypeEnum;"

An IfcStackTerminalTypeEnum defines the range of different types of stack terminal that can be specified for use at the top of a vertical stack subsystem.

HISTORY: New type in IFC 2x

Enumeration

BIRDCAGE: Guard cage, typically wire mesh, at the top of the stack preventing access by birds.
COWL: A cowling placed at the top of a stack to eliminate downdraft.
RAINWATERHOPPER: A box placed at the top of a rainwater downpipe to catch rainwater from guttering.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 3684;IfcSanitaryTerminalTypeEnum;"

The IfcSanitaryTerminalTypeEnum defines the range of different types of sanitary terminal that can be specified.

NOTE: The value WCSEAT has been deprecated and should no longer be used; toilet seats should be represented by IfcDiscreteAccessory with ObjectType 'WC Seat'.

HISTORY: New type in IFC 2x2

Enumeration

BATH: Sanitary appliance for immersion of the human body or parts of it.
BIDET: Waste water appliance for washing the excretory organs while sitting astride the bowl.
CISTERN: A water storage unit attached to a sanitary terminal that is fitted with a device, operated automatically or by the user, that discharges water to cleanse a water closet (toilet) pan, urinal or slop hopper.
SHOWER: Installation or waste water appliance that emits a spray of water to wash the human body.
SINK: Waste water appliance for receiving, retaining or disposing of domestic, culinary, laboratory or industrial process liquids.
SANITARYFOUNTAIN: A sanitary terminal that provides a low pressure jet of water for a specific purpose.
TOILETPAN: Soil appliance for the disposal of excrement.
URINAL: Soil appliance that receives urine and directs it to a waste outlet (BS6100).
WASHHANDBASIN: Waste water appliance for washing the upper parts of the body.
WCSEAT: [Deprecated] Hinged seat that fits on the top of a water closet (WC) pan.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 3700;IfcFireSuppressionTerminalTypeEnum;"

The IfcFireSuppressionTerminalTypeEnum defines the range of different types of fire suppression terminal that can be specified.

HISTORY: New type in IFC 2x2

Enumeration

BREECHINGINLET: Symmetrical pipe fitting that unites two or more inlets into a single pipe (BS6100 330 114 adapted). A breeching inlet may be used on either a wet or dry riser. Used by fire services personnel for fast connection of fire appliance hose reels. May also be used for foam.
FIREHYDRANT: Device, fitted to a pipe, through which a temporary supply of water may be provided (BS6100 330 6107). May also be termed a stand pipe.
HOSEREEL: A supporting framework on which a hose may be wound (BS6100 155 8201).
SPRINKLER: Device for sprinkling water from a pipe under pressure over an area (BS6100 100 3432).
SPRINKLERDEFLECTOR: Device attached to a sprinkler to deflect the water flow into a spread pattern to cover the required area.
USERDEFINED: User-defined type.
NOTDEFINED: Underined type.

" 3727;IfcInterceptorTypeEnum;"

The IfcInterceptorTypeEnum defines the range of different types of interceptor that can be specified.

HISTORY: New type in IFC 2x4

Enumeration

CYCLONIC: Removes larger liquid drops or larger solid particles.
GREASE: Chamber, on the line of a drain or discharge pipe, that prevents grease passing into a drainage system (BS6100 330 6205).
OIL: One or more chambers arranged to prevent the ingress of oil to a drain or sewer, that retain the oil for later removal (BS6100 330 67316).
PETROL: Two or more chambers with inlet and outlet pipes arranged to allow petrol/gasoline collected on the surface of water drained into them to evaporate through ventilating pipes.
USERDEFINED: User-defined type.
NOTDEFINED: Undefined type.

" 3819;IfcDocumentConfidentialityEnum;"

IfcDocumentConfidentialityEnum enables selection of the level of confidentiality of document information from a list of choices.

HISTORY: New enumeration in IFC 2x

Enumeration

PUBLIC: Document is publicly available.
RESTRICTED: Document availability is restricted.
CONFIDENTIAL: Document is confidential and its contents should not be revealed without permission.
PERSONAL: Document is personal to the author.
USERDEFINED
NOTDEFINED

" 3826;IfcDocumentStatusEnum;"

IfcDocumentStatusEnum enables selection of the status of document information from a list of choices.

HISTORY: New enumeration in IFC Release 2x.

" 3903;IfcBenchmarkEnum;"

IfcBenchmarkEnum is an enumeration used to identify the logical comparators that can be applied in conjunction with constraint values.

HISTORY: New type in IFC Release 2.0

IFC2x4 CHANGE: Extended to include comparators for item-set and set-item comparisons: INCLUDES, NOTINCLUDES, INCLUDEDIN and NOTINCLUDEDIN, to test if an individual item is a member of a given aggregation, or if an aggregation has a given individual item as a member.

Enumeration

Value	Definition
GREATERTHAN	Identifies that a value must be greater than that set by the constraint.
GREATERTHANOREQUALTO	Identifies that a value must be either greater than or equal to that set by the constraint.
LESSTHAN	Identifies that a value must be less than that set by the constraint.
LESSTHANOREQUALTO	Identifies that a value must be either less than or equal to that set by the constraint.
EQUALTO	Identifies that a value must be equal to that set by the constraint.
NOTEQUALTO	Identifies that a value must be not equal to that set by the constraint.
INCLUDES	Identifies that an aggregation (set, list or table) must include the value (individual item) set by the constraint.
NOTINCLUDES	Identifies that an aggregation (set, list or table) must not include (i.e must exclude) the value (individual item) set by the constraint.
INCLUDEDIN	Identifies that a value (individual item) must be included in the aggregation (set, list or table) set by the constraint.
NOTINCLUDEDIN	Identifies that a value (individual item) must not be included (i.e. must be excluded) in the aggregation (set, list or table) set by the constraint.

" 3921;IfcObjectiveEnum;"

IfcObjectiveEnum is an enumeration used to determine the objective for which purpose the constraint needs to be satisfied.

HISTORY: IFC2x4 CHANGE: Extended to include CODEWAIVER.

Enumeration

Value	Definition
CODECOMPLIANCE	A constraint whose objective is to ensure satisfaction of a code compliance provision.
CODEWAIVER	A constraint whose objective is to identify an agreement that code compliance requirements (the waiver) will not be enforced.
DESIGNINTENT	A constraint whose objective is to ensure satisfaction of a design intent provision.
HEALTHANDSAFETY	A constraint whose objective is to ensure satisfaction of a health and safety provision.
REQUIREMENT	A constraint whose objective is to ensure satisfaction of a project requirement provision.
SPECIFICATION	A constraint whose objective is to ensure satisfaction of a specification provision.
TRIGGERCONDITION	A constraint whose objective is to indicate a limiting value beyond which the condition of an object requires a particular form of attention.

" 3931;IfcConstraintEnum;"

IfcConstraintEnum is an enumeration used to qualify a constraint.

HISTORY: New type in IFC Release 2.0

Enumeration

Value	Definition
HARD	Qualifies a constraint such that it must be followed rigidly within or at the values set.
SOFT	Qualifies a constraint such that it should be followed within or at the values set.
ADVISORY	Qualifies a constraint such that it is advised that it is followed within or at the values set.

" 3947;IfcLogicalOperatorEnum;"

Definition: IfcLogicalOperatorEnum is an enumeration that defines the logical operators that may be applied for the satisfaction of one or more operands (IfcConstraint) at a time.

HISTORY New type in IFC Release 2.0. Renamed from IfcConstraintAggregatorEnum in IFC 2x2

IFC2x4 CHANGE: Extended to include LOGICALXOR, LOGICALNOTAND and LOGICALNOTOR.

Enumeration

Value	Definition
LOGICALAND	Defines a relationship between operands whereby the result is true if all operands are true, i.e. false if at least one operand is false.
LOGICALOR	Defines a relationship between operands whereby the result is true if at least one operand is true, i.e false if all operands are false.
LOGICALXOR	Defines a relationship between operands whereby the result is true if exactly one operand is true (exclusive or).
LOGICALNOTAND	Defines a relationship between operands whereby the result is true if at least one operand is false, i.e false if all operands are true.
LOGICALNOTOR	Defines a relationship between operands whereby the result is true if all operands are false, i.e false if at least one operand is true.

Use Definition

The IfcLogicalOperatorEnum, when applied in a case of three operands, A, B and C, evaluates for each operator as follows:

TRUTH TABLE: LOGICALAND(A,B,C)
A	F	F	F	T	F	T	T	T
B	F	F	T	F	T	F	T	T
C	F	T	F	F	T	T	F	T
AND	F	F	F	F	F	F	F	T

TRUTH TABLE: LOGICALOR(A,B,C)
A	F	F	F	T	F	T	T	T
B	F	F	T	F	T	F	T	T
C	F	T	F	F	T	T	F	T
OR	F	T	T	T	T	T	T	T

TRUTH TABLE: LOGICALXOR(A,B,C)
A	F	F	F	T	F	T	T	T
B	F	F	T	F	T	F	T	T
C	F	T	F	F	T	T	F	T
XOR	F	T	T	T	F	F	F	F

TRUTH TABLE: LOGICALNOTAND(A,B,C)
A	F	F	F	T	F	T	T	T
B	F	F	T	F	T	F	T	T
C	F	T	F	F	T	T	F	T
NOTAND	T	T	T	T	T	T	T	F

TRUTH TABLE: LOGICALNOTOR(A,B,C)
A	F	F	F	T	F	T	T	T
B	F	F	T	F	T	F	T	T
C	F	T	F	F	T	T	F	T
NOTOR	T	F	F	F	F	F	F	F

" 3984;IfcArithmeticOperatorEnum;"

IfcArithmeticOperatorEnum specifies the form of arithmetical operation implied by the relationship.

Enumeration

ADD
DIVIDE
MULTIPLY
SUBTRACT

HISTORY: New enumeration in IFC2x2.

Use definitions

There can be only one arithmetic operator for each applied value relationship. This is to enforce arithmetic consistency. Given this consistency, the cardinality of the IfcAppliedValueRelationship.Components attribute is a set of one to many applied values that are components of an applied value.

" 4027;IfcTimeSeriesDataTypeEnum;"

IfcTimeSeriesDataTypeEnum describes a type of time series data and is used to determine a value during the time series which is not explicitly specified:

CONTINUOUS: The time series data is continuous.
DISCRETE: The time series data is discrete.
DISCRETEBINARY: The time series data is discrete binary.
PIECEWISEBINARY: The time series data is piecewise binary.
PIECEWISECONSTANT: The time series data is piecewise constant.
PIECEWISECONTINUOUS: The time series data is piecewise continuous.
NOTDEFINED: The time series data is not defined.

HISTORY: New enumeration in IFC2x2.

" 4035;IfcDataOriginEnum;"

IfcDataOriginEnum identifies the origin of time data:

MEASURED: The origin of the time data is a measurement device.
PREDICTED: The time data are a prediction.
SIMULATED: The origin of the time data is a simulation.
NOTDEFINED: The origin of the time data is undefined.

HISTORY: New enumeration in IFC 2x2.

" 4075;IfcTaskDurationEnum;"

IfcTaskDurationEnum identifies how a time duration is measured:

ELAPSEDTIME: The time duration is based on elapsed time (24 hours per day, independent of calendar).
WORKTIME: The time duration is based on work time (calendar-dependent).
NOTDEFINED: The time duration is undefined.

HISTORY: New enumeration in IFC2x4.

" 4113;IfcRecurrenceTypeEnum;"

IfcRecurrenceTypeEnum enumerates the recurring pattern type. The following combinations are valid:

DAILY: Interval, Occurrences

WEEKLY: WeekdayComponent, Interval, Occurrences

MONTHLY_BY_DAY_OF_MONTH: DayComponent, Interval, Occurrences

MONTHLY_BY_POSITION: WeekdayComponent, Position, Interval, Occurrences

BY_DAY_COUNT: Interval, Occurrences

BY_WEEKDAY_COUNT: WeekdayComponent, Interval, Occurrences

YEARLY_BY_DAY_OF_MONTH: DayComponent, MonthComponent, Interval, Occurrences

YEARLY_BY_POSITION: WeekdayComponent, MonthComponent, Position, Interval, Occurrences

HISTORY: New enumeration in IFC Release 2x4.

" 4230;IfcLayerSetDirectionEnum;"

IfcLayerSetDirectionEnum provides identification of the axis of element geometry, denoting the layer set thickness direction, or direction of layer offsets.

ENUMERATION

AXIS1: Usually x-axis.
AXIS2: Usually y-axis.
AXIS3: Usually z-axis.

HISTORY: New Type in IFC2x.

" 4300;IfcDirectionSenseEnum;"

IfcDirectionSenseEnum is an enumeration denoting whether sense of direction is positive or negative along the given axis.

ENUMERATION

POSITIVE: Direction defined to be positive.
NEGATIVE: Direction defined to be negative.

HISTORY New Type in IFC2x.

" 4571;IfcSIPrefix;"

Definition from ISO/CD 10303-41:1992: An SI prefix is the name of a prefix that may be associated with an SI unit. The definitions of SI prefixes are specified in ISO 1000 (clause 3).

NOTE The prefix defines multiples and submultiples of the SI units.

NOTE Corresponding ISO 10303 name: SI_prefix, please refer to ISO/IS 10303-41 for the final definition of the formal standard.

ENUMERATION

EXA: 10^18.
PETA: 10^15.
TERA: 10^12.
GIGA: 10^9.
MEGA: 10^6.
KILO: 10^3.
HECTO: 10^2.
DECA: 10.
DECI: 10^-1.
CENTI: 10^-2.
MILLI: 10^-3.
MICRO: 10^-6.
NANO: 10^-9.
PICO: 10^-12.
FEMTO: 10^-15.
ATTO: 10^-18.

HISTORY New entity in IFC Release 1.5.1.

" 4588;IfcSIUnitName;"

Definition from ISO/CD 10303-41:1992: An SI unit name is the name of an SI unit. The definitions of the names of SI units are specified in ISO 1000 (clause 2).

NOTE Corresponding STEP name: SI_unit_name, please refer to ISO/IS 10303-41 for the final definition of the formal standard.

ENUMERATION

AMPERE: Unit for electric current.
BECQUEREL: Unit for radioactivity.
CANDELA: Unit for luminousintensity.
COULOMB: Unit for electric charge.
CUBIC_METRE: Unit for volume.
DEGREE_CELSIUS: Unit for thermodynamic temperature.
FARAD: Unit for electric capacitance.
GRAM: Unit for mass.
GRAY: Unit for absorbed radioactive dose.
HENRY: Unit for inductance.
HERTZ: Unit for frequency.
JOULE: Unit for energy.
KELVIN: Unit for thermodynamic temperature.
LUMEN: Unit for luminous flux.
LUX: Unit for illuminance.
METRE: Unit for length.
MOLE: Unit for amount of substance.
NEWTON: Unit for force.
OHM: Unit for electric resistance.
PASCAL: Unit for pressure.
RADIAN: Unit for plane angle.
SECOND: Unit for time.
SIEMENS: Unit for electric conductance.
SIEVERT: Unit for radioactive dose equivalent.
SQUARE_METRE: Unit for area.
STERADIAN: Unit for solid angle.
TESLA: Unit for magnetic flux density.
VOLT: Unit for electric voltage.
WATT: Unit for power.
WEBER: Unit for magnetic flux.

HISTORY New entity in IFC Release 1.5.1.

" 4627;IfcUnitEnum;"

IfcUnitEnum is an enumeration type for allowed unit types of IfcNamedUnit.

ENUMERATION

ABSORBEDDOSEUNIT
AMOUNTOFSUBSTANCEUNIT
AREAUNIT
DOSEEQUIVALENTUNIT
ELECTRICCAPACITANCEUNIT
ELECTRICCHARGEUNIT
ELECTRICCONDUCTANCEUNIT
ELECTRICCURRENTUNIT
ELECTRICRESISTANCEUNIT
ELECTRICVOLTAGEUNIT
ENERGYUNIT
FORCEUNIT
FREQUENCYUNIT
ILLUMINANCEUNIT
INDUCTANCEUNIT
LENGTHUNIT
LUMINOUSFLUXUNIT
LUMINOUSINTENSITYUNIT
MAGNETICFLUXDENSITYUNIT
MAGNETICFLUXUNIT
MASSUNIT
PLANEANGLEUNIT
POWERUNIT
PRESSUREUNIT
RADIOACTIVITYUNIT
SOLIDANGLEUNIT
THERMODYNAMICTEMPERATUREUNIT
TIMEUNIT
VOLUMEUNIT
USERDEFINED: User defined unit type. The type of unit is only implied by its name or the usage context.

HISTORY New type in IFC Release 1.5.1.

" 4658;IfcDerivedUnitEnum;"

IfcDerivedUnitEnum is an enumeration type for allowed types of derived units.

ENUMERATION

ACCELERATIONUNIT
ANGULARVELOCITYUNIT
COMPOUNDPLANEANGLEUNIT
DYNAMICVISCOSITYUNIT
HEATFLUXDENSITYUNIT
INTEGERCOUNTRATEUNIT
ISOTHERMALMOISTURECAPACITYUNIT
KINEMATICVISCOSITYUNIT
LINEARFORCEUNIT
LINEARMOMENTUNIT
LINEARSTIFFNESSUNIT
LINEARVELOCITYUNIT
MASSDENSITYUNIT
MASSFLOWRATEUNIT
MODULUSOFELASTICITYUNIT
MODULUSOFSUBGRADEREACTIONUNIT
MOISTUREDIFFUSIVITYUNIT
MOLECULARWEIGHTUNIT
MOMENTORINERTIAUNIT
PLANARFORCEUNIT
ROTATIONALFREQUENCYUNIT
ROTATIONALSTIFFNESSUNIT
SHEARMODULUSUNIT
SPECIFICHEATCAPACITYUNIT
THERMALADMITTANCEUNIT
THERMALCONDUCTANCEUNIT
THERMALRESISTANCEUNIT
THERMALTRANSMITTANCEUNIT
TORQUEUNIT
VAPORPERMEABILITYUNIT
VOLUMETRICFLOWRATEUNIT
CURVATUREUNIT
HEATINGVALUEUNIT
IONCONCENTRATIONUNIT
LUMINOUSINTENSITYDISTRIBUTIONUNIT
MASSPERLENGTHUNIT
MODULUSOFLINEARSUBGRADEREACTIONUNIT
MODULUSOFROTATIONALSUBGRADEREACTIONUNIT
PHUNIT
ROTATIONALMASSUNIT
SECTIONAREAINTEGRALUNIT
SECTIONMODULUSUNIT
SOUNDPOWERUNIT
SOUNDPRESSUREUNIT
TEMPERATUREGRADIENTUNIT
TEMPERATURERATEOFCHANGE
THERMALEXPANSIONCOEFFICIENTUNIT
WARPINGCONSTANTUNIT
WARPINGMOMENTUNIT
USERDEFINED: User defined derived unit.

HISTORY: New type in IFC Release 2.0.

IFC 2x4 change: added TEMPERATURERATEOFCHANGE.

" 4823;IfcNullStyle;"

Definition from ISO/CD 10303-46:1992: The null style type specifies, that a representation item is not styled.

NOTE Corresponding ISO 10303 name: null_style. Please refer to ISO/IS 10303-46:1994 for the final definition of the formal standard.

HISTORY New enumeration in IFC2x2.

IFC2x4 CHANGE The enumeration is deprecated.

" 4837;IfcSurfaceSide;"

IfcSurfaceSide is a denotion of whether negative, positive or both sides of a surface are being referenced.

ENUMERATION Definition from ISO/CD 10303-46:1992:

POSITIVE: The side of a surface which is in the same direction as the surface normal derived from the mathematical definition.
NEGATIVE: The side of a surface which is in the opposite direction than the surface normal derived from the mathematical definition.
BOTH: Both, positive and negative side.

NOTE Corresponding ISO 10303 type: surface_side. Please refer to ISO/IS 10303-46:1994 for the final definition of the formal standard.

HISTORY: New Enumeration in IFC 2.0

" 4868;IfcReflectanceMethodEnum;"

The IfcReflectanceMethodEnum defines the range of different reflectance methods available.

HISTORY: New type in IFC 2x2.

Enumeration

BLINN: A reflectance model providing a smooth, slightly shiny appearance.
FLAT: A reflectance model providing a constant colour. This model ignores the effect of all light sources.
GLASS: A reflectance model that supports an approximation of glass-like materials that have both reflective and transmissive properties.
MATT: A reflectance model providing a dull matte appearance.
METAL: A reflectance model providing a specular metallic appearance.
MIRROR: A reflectance model that supports secondary mirrored views through ray tracing.
PHONG: A reflectance model conforming with the Phong model in which reflections are greatest in the `mirror' direction of a surface opposite the viewing direction with respect to the surface normal.
PLASTIC: A reflectance model providing a specular effect which is similar to the Phong model.
STRAUSS: A reflectance model for metallic and non-metallic appearance based on a limited set of control parameter.
NOTDEFINED

" 4975;IfcTextPath;"

The text path determines the direction of the text characters in respect to each other.

NOTE: The IfcTextPath is an entity that had been adopted from ISO 10303, Industrial automation systems and integration—Product data representation and exchange, Part 46: Integrated generic resources: Visual presentation.

NOTE Corresponding ISO 10303 name:text_path . Please refer to ISO/IS 10303-46:1994 for the final definition of the formal standard.

HISTORY New entity in IFC2x2.

" 5012;IfcLightEmissionSourceEnum;"

IfcLightEmissionSourceEnum defines the range of different types of light emitter available.

HISTORY: New type in IFC2x2.

Enumeration

COMPACTFLUORESCENT
FLUORESCENT
HIGHPRESSUREMERCURY
HIGHPRESSURESODIUM
LIGHTEMITTINGDIODE
LOWPRESSURESODIUM
LOWVOLTAGEHALOGEN
MAINVOLTAGEHALOGEN
METALHALIDE
TUNGSTENFILAMENT
NOTDEFINED

" 5030;IfcLightDistributionCurveEnum;"

There are three kinds of light distribution curves, according to Standard CEN TC 169, prEN 13032-1, CIE 121:

TYPE_A: Type A is basically not used. For completeness the Type A Photometry equals the Type B rotated 90° around the Z-Axis counter clockwise.
TYPE_B: Type B is sometimes used for floodlights. The B-Plane System has a horizontal axis. B-Angles are valid from -180° to +180° with B 0° at the bottom and B180°/B-180° at the top, β-Angles are valid from -90° to +90°. (See Figure 302.)
TYPE_C: Type C is the recommended standard system. The C-Plane system equals a globe with a vertical axis. C-Angles are valid from 0° to 360°, γ-Angles are valid from 0° (south pole) to 180° (north pole). (See Figure 302.)


B-Type System	C-Type System

Figure 302 — Light distribution curves

HISTORY This is a new enumeration in IFC2x2.

" 5109;IfcProfileTypeEnum;"

The enumeration defines whether the definition of a profile shape shall be geometrically resolved into a curve or into a surface.

HISTORY: New type in IFC 1.5.

Enumeration values:

CURVE: The resulting geometric item is of type curve and closed (with the only exception of the curve created by the IfcArbitraryOpenProfileDef which resolves into an open curve). The resulting geometry after applying a sweeping operation is a swept surface. This can be used to define shapes with thin sheets, such as ducts, where the thickness is not appropriate for geometric representation.
AREA: The resulting geometric item is of type surface. The resulting geometry after applying a sweeping operation is a swept solid with defined volume.

" 5214;IfcReinforcingBarSurfaceEnum;"

Definition from IAI: Enumeration indicating whether the bar has a plain or textured (ribbed) surface.

HISTORY New type in IFC Release 2x2

ENUMERATION

PLAIN The reinforcing bar surface is plain.
TEXTURED The reinforcing bar surface is textured (ribbed).

" 5221;IfcSectionTypeEnum;"

Definition from IAI: An enumeration indicating whether a specific piece of a cross section is uniform or tapered in longitudinal direction.

HISTORY New type in IFC Release 2x2

ENUMERATION

UNIFORM The section is uniform in longitudinal direction.
TAPERED The section is tapered in longitudinal direction.

" 5231;IfcReinforcingBarRoleEnum;"

Definition from IAI: Enumeration defining standard types for the role, purpose or usage of the bar, i.e. the kind of loads and stresses they are intended to carry.

HISTORY New type in IFC Release 2x2.
Item ANCHORING (documented since IFC 2x2) added to the EXPRESS definition in IFC 2x4.

ENUMERATION

MAIN The reinforcing bar is a main bar.
SHEAR The reinforcing bar is a shear bar.
LIGATURE The reinforcing bar is a ligature (link, stirrup).
STUD The reinforcing bar is a stud.
PUNCHING Punching reinforcement.
EDGE Edge reinforcement.
RING Ring reinforcement.
ANCHORING Anchoring reinforcement.
USERDEFINED The type of reinforcement is user defined.
NOTDEFINED The type of reinforcement is not defined.

" 5263;IfcStateEnum;"

The IfcStateEnum enumeration identifies the state or accessibility of the object (for example, read/write, locked).

Valid enumerations are:

READWRITE: Object is in a Read-Write state. It may be modified by an application.
READONLY: Object is in a Read-Only state. It may be viewed but not modified by an application.
LOCKED: Object is in a Locked state. It may not be accessed by an application.
READWRITELOCKED: Object is in a Read-Write-Locked state. It may not be accessed by an application.
READONLYLOCKED: Object is in a Read-Only-Locked state. It may not be accessed by an application.

HISTORY New enumeration in IFC R2.0.

IFC2x3 CHANGE This concept was initially introduced in IFC 2.0 as IfcModifiedFlag of type BINARY(3) FIXED and has been modified in R2x to an enumeration. It was initially introduced as a first step towards providing facilities for partial model exchange from a server as requested by the IFC implementers. It is intended for use primarily by a model server so that an application can identify the state of the object.

" 5269;IfcChangeActionEnum;"

IfcChangeActionEnum identifies the type of change that might have occurred to the object during the last session (for example, added, modified, deleted). This information is required in a partial model exchange scenario so that an application or model server will know how an object might have been affected by the previous application. Valid enumerations are:

NOCHANGE: Object has not been modified.
MODIFIED: A modification to the object has been made by the user and application defined by the LastModifyingUser and LastModifyingApplication respectively.
ADDED: The object has been created by the user and application defined by the OwningUser and OwningApplication respectively.
DELETED: The object has been deleted by the user and application defined by the LastModifyingUser and LastModifyingApplication respectively.
NOTDEFINED: The change action is not known or has not been defined.

Consider Application A will create an IFC dataset that it wants to publish to others for modification and have the ability to subsequently merge these changes back into the original model. Before publication, it may want to set the IfcChangeActionEnum to NOCHANGE to establish a baseline so that other application changes can be easily identified. Application B then receives this IFC dataset and adds a new object and sets IfcChangeActionEnum to ADDED with Application B defined as the OwningApplication. Application B then modifies an existing object and (re)defines the LastModifiedDate to the time of the modification, LastModifyingUser to the IfcPersonAndOrganization making the change, and sets the LastModifyingApplication to Application B. When Application A receives this modified dataset, it can determine which objects have been added and modified by Application B and either merge or reject these changes as necessary. Consequently, the intent is that an application only modifies the value of IfcChangeActionEnum when it does something to the object, with the further intent that a model server is responsible for clearing the IfcChangeActionEnum back to NOCHANGE when it is ready to be republished.

HISTORY: New enumeration in IFC R2.0. Modified in IFC2x4.

" 5452;IfcBooleanOperator;"

Definition from ISO/CD 10303-42:1992: This type defines the three Boolean operators used in the definition of CSG solids.

UNION: The operation of constructing the regularized set theoretic union of the volumes defined by two solids.
INTERSECTION: The operation of constructing the regularised set theoretic intersection of the volumes defined by two solids.
DIFFERENCE: The operation of constructing the regularized set theoretic intersection of the volumes defined by two solids.

NOTE Corresponding STEP type: boolean_operator, please refer to ISO/IS 10303-42:1994, p.167 for the final definition of the formal standard.

HISTORY New Type in IFC Release 1.5.1.

" 5699;IfcKnotType; 5704;IfcBSplineSurfaceForm; 5727;IfcTransitionCode;"

Definition from ISO/CD 10303-42:1992: This type conveys the continuity properties of a composite curve or surface. The continuity referred to is geometric, not parametric continuity. For example, in ContSameGradient the tangent vectors of successive segments will have the same direction, but may have different magnitude.

NOTE Corresponding ISO 10303 type: transition_code, please refer to ISO/IS 10303-42:1994, p. 14 for the final definition of the formal standard.

HISTORY New Type in IFC Release 1.0

Figure 273 (quoted from ISO/CD 10303-42:1992, p.55) illustrates transition types.

Figure 273 — Transition code

ENUMERATION

DISCONTINUOUS: The segments do not join. This is permitted only at the boundary of the curve or surface to indicate that it is not closed.
CONTINUOUS: The segments join but no condition on their tangents is implied.
CONTSAMEGRADIENT: The segments join and their tangent vectors or tangent planes are parallel and have the same direction at the joint: equality of derivatives is not required.
CONTSAMEGRADIENTSAMECURVATURE: For a curve, the segments join, their tangent vectors are parallel and in the same direction and their curvatures are equal at the joint: equality of derivatives is not required. For a surface this implies that the principle curvatures are the same and the principle directions are coincident along the common boundary.

" 5747;IfcTrimmingPreference;"

Definition from ISO/CD 10303-42:1992: This type is used to describe the preferred way of trimming a parametric curve where the trimming is multiply defined.

NOTE Corresponding ISO 10303 type: trimming_preference, please refer to ISO/IS 10303-42:1994, p. 18 for the final definition of the formal standard.

HISTORY New Type in IFC Release 1.0

ENUMERATION

CARTESIAN: Indicates that trimming by Cartesian point is preferred.
PARAMETER: Indicates the preference for the parameter value.
UNSPECIFIED: Indicates that no preference is communicated.

" 5774;IfcBSplineCurveForm;"

Definition from ISO/CD 10303-42:1992: This type is used to indicate that the B-spline curve represents a part of a curve of some specific form.

Enumeration

polyline form: A connected sequence of line segments represented by degree 1 B-spline basis functions.
circular arc: An arc of a circle, or a complete circle represented by a B-spline curve.
elliptic arc: An arc of an ellipse, or a complete ellipse, represented by a B-spline curve.
parabolic arc: An arc of finite length of a parabola represented by a B-spline curve.
hyperbolic arc: An arc of finite length of one branch of a hyperbola represented by a B-spline curve.
unspecified: A B-spline curve for which no particular form is specified.

NOTE Corresponding ISO 10303 type: b_spline_curve_form. Please refer to ISO/IS 10303-42:1994, p. 15 for the final definition of the formal standard.

HISTORY New type in Release IFC2x2.