#### 5.4.3.22 IfcTransportElement

| Equipement de transport
| Beförderungsgerät

A transport element is a generalization of all transport related objects that move people, animals or goods within a building or building complex. The IfcTransportElement defines the occurrence of a transport element, that (if given), is expressed by the IfcTransportElementType.

> EXAMPLE Transportation elements include elevator (lift), escalator, moving walkway, etc.

> NOTE More detailed equipment that may be a part of a transportation device, like a lifting hook, is defined as IfcDiscreteAccessory. It maybe included as a part of the IfcTransportElement by virtue of the objectified relationship IfcRelAggregates.

Depending on local classification systems transport elements and transportation systems in buildings are either considered as part of a building system, or as part of a building service system. Within IFC they are considered as part of a building system and may have to be mapped appropriately.

> HISTORY New entity in IFC2x.

> IFC2x CHANGE The attribute PredefinedType (previously OperationType) is made optional.

> IFC4 CHANGE The last attributes CapacityByWeight and CapacityByNumber are removed, use Pset_TransportElementCommon instead.

## Electrical System Design

Instance diagram

Identity

The Identity concept applies to this entity.

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Export |  | R |  | R | R | R | R | R |  |  | R | R | R

Object Typing

The Object Typing concept applies to this entity.

IfcTransportElement defines the occuurence of any transportation device, common information about transportation device types (or styles) is handled by IfcTransportElementType. The IfcTransportElementType (if present) may establish the common type name, usage (or predefined) type, common material layer set, common set of properties and common shape representations (using IfcRepresentationMap). The IfcTransportElementType is attached using the IfcRelDefinedByType.RelatingType objectified relationship and is accessible by the inverse IsTypedBy attribute.

If no IfcTransportElementType is attached (i.e. if only occurrence information is given) the PredefinedType should be provided. If set to .USERDEFINED. a user defined value can be provided by the ObjectType attribute.

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Properties for Occurrences

The Properties for Occurrences concept applies to this entity.

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Import |  |  |  |  | R |  | R |  |  |  |  |  | R
Export |  | R |  | R | R | R | R |  |  |  |  |  | R

Placement

The Placement concept applies to this entity.

The local placement for IfcTransportElement is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations.

- The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement , which is used in the ContainedInStructure inverse attribute, or to a spatial structure element at a higher level, referenced by that.
- If the relative placement is not used, the absolute placement is defined within the world coordinate system.

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Export |  |  |  |  |  |  |  |  |  |  | R |  |

Body Geometry

The Body Geometry concept applies to this entity as shown in Table 34.

RepresentationType | Geometry
--- | ---
SurfaceModel | IfcFaceBasedSurfaceModel
Brep | IfcFacetedBrep
Tessellation | IfcTriangulatedFaceSet
MappedRepresentation | IfcMappedItem
Table 34 — IfcTransportElement Body Geometry

The body representation of any IfcTransportElement has the following representation types: 'Tessellation', 'SurfaceModel', 'Brep', and 'MappedRepresentation'.

> NOTE Other representation types might be specified in view definitions or implementer agreements.

> NOTE In addition to the 'Body' representation, an IfcTransportElement may have a 'Body-FallBack' representation assigned. It provides an easier to read and visualize geometric representation.

> EXAMPLE In addition to a 'Body' representation of type 'Clipping', or 'CSG' and 'Body-FallBack' representation of type 'Tessellation' could be added that has all Boolean operations and curve segmentation already resolved.

Tessellation Representation Type

Any IfcBuildingElement (so far no further constraints are defined at the level of its subtypes) may be represented as a single or multiple tessellated surface models, including a triangulated surface model. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used:

- RepresentationIdentifier : 'Body', or 'Body-FallBack'
- RepresentationType : 'Tessellation'

SurfaceModel Representation

Any IfcTransportElement (so far no further constraints are defined at the level of its subtypes) may be represented as a single or multiple surface models, based on either shell or face based models. Then the following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used:

- RepresentationIdentifier : 'Body'
- RepresentationType : 'SurfaceModel'

Brep Representation

Any IfcTransportElement (so far no further constraints are defined at the level of its subtypes) may be represented as a single or multiple Boundary Representation elements (which are restricted to faceted Brep with or without voids). Then the following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used:

- RepresentationIdentifier : 'Body'
- RepresentationType : 'Brep'

MappedRepresentation

The mapped item, IfcMappedItem, should be used if appropriate as it allows for reusing the geometry definition of the property element type at occurrences of the same equipement type. Then the following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used:

- RepresentationIdentifier : 'Body'
- RepresentationType : 'MappedRepresentation'

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Export |  |  |  |  |  |  |  |  |  |  | R | R | R

Ports

The Ports concept applies to this entity.

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Spatial Containment

The Spatial Containment concept applies to this entity.

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Classification

The Classification concept applies to this entity.

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XSD Specification:

<xs:element name="IfcTransportElement" type="ifc:IfcTransportElement" substitutionGroup="ifc:IfcElement" nillable="true"/>
<xs:complexType name="IfcTransportElement">
<xs:complexContent>
<xs:extension base="ifc:IfcElement"/>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcTransportElement

| SUBTYPE OF (IfcElement);

PredefinedType | : | OPTIONAL IfcStrippedOptional;

| WHERE

CorrectPredefinedType | : | NOT(EXISTS(PredefinedType)) OR (PredefinedType <> IfcTransportElementTypeEnum.USERDEFINED) OR ((PredefinedType = IfcTransportElementTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));
CorrectTypeAssigned | : | (SIZEOF(IsTypedBy) = 0) OR ('IFCPRODUCTEXTENSION.IFCTRANSPORTELEMENTTYPE' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType));

END_ENTITY;

Attribute Definitions:

PredefinedType | : | Predefined generic types for a transportation element that are specified in an enumeration. There might be property sets defined specifically for each predefined type. IFC4 CHANGE The attribute has been changed to be optional.

Formal Propositions:

CorrectPredefinedType | : | Either the IfcTransportElement attribute is unset (e.g. because an IfcTransportElementType is associated), or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED.
CorrectTypeAssigned | : | Either there is no transport element type object associated, i.e. the IsTypedBy inverse relationship is not provided, or the associated type object has to be of type IfcTransportElementType.

Inheritance Graph:

ENTITY IfcTransportElement

| ENTITY IfcRoot

GlobalId | : | IfcGloballyUniqueId;
OwnerHistory | : | OPTIONAL IfcOwnerHistory;
Name | : | OPTIONAL IfcLabel;
Description | : | OPTIONAL IfcText;

| ENTITY IfcObjectDefinition

| INVERSE

HasAssignments | : | SET OF IfcRelAssigns FOR RelatedObjects;
Nests | : | SET [0:1] OF IfcRelNests FOR RelatedObjects;
IsNestedBy | : | SET OF IfcRelNests FOR RelatingObject;
HasContext | : | SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions;
IsDecomposedBy | : | SET OF IfcRelAggregates FOR RelatingObject;
Decomposes | : | SET [0:1] OF IfcRelAggregates FOR RelatedObjects;
HasAssociations | : | SET OF IfcRelAssociates FOR RelatedObjects;

| ENTITY IfcObject

ObjectType | : | OPTIONAL IfcStrippedOptional;

| INVERSE

IsDeclaredBy | : | SET [0:1] OF IfcRelDefinesByObject FOR RelatedObjects;
Declares | : | SET OF IfcRelDefinesByObject FOR RelatingObject;
IsTypedBy | : | SET [0:1] OF IfcRelDefinesByType FOR RelatedObjects;
IsDefinedBy | : | SET OF IfcRelDefinesByProperties FOR RelatedObjects;

| ENTITY IfcProduct

ObjectPlacement | : | OPTIONAL IfcObjectPlacement;
Representation | : | OPTIONAL IfcProductRepresentation;

| INVERSE

ReferencedBy | : | SET OF IfcRelAssignsToProduct FOR RelatingProduct;

| ENTITY IfcElement

Tag | : | OPTIONAL IfcStrippedOptional;

| INVERSE

IsInterferedByElements | : | SET OF IfcRelInterferesElements FOR RelatedElement;
InterferesElements | : | SET OF IfcRelInterferesElements FOR RelatingElement;
ContainedInStructure | : | SET [0:1] OF IfcRelContainedInSpatialStructure FOR RelatedElements;

| ENTITY IfcTransportElement

PredefinedType | : | OPTIONAL IfcStrippedOptional;

END_ENTITY;

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