Equipement de transport

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.

Common Use Definitions

The following concepts are inherited at supertypes:

 Instance diagram

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.

Property Sets for Objects

The Property Sets for Objects concept applies to this entity as shown in Table 76.

Table 76 — IfcTransportElement Property Sets for Objects

Spatial Containment

The Spatial Containment concept applies to this entity.

XSD Specification:

 <xs:element name="IfcTransportElement" type="ifc:IfcTransportElement" substitutionGroup="ifc:IfcElement" nillable="true"/>
 <xs:complexType name="IfcTransportElement">
   <xs:extension base="ifc:IfcElement">
    <xs:attribute name="PredefinedType" type="ifc:IfcTransportElementTypeEnum" use="optional"/>

EXPRESS Specification:

ENTITY IfcTransportElement
SUBTYPE OF IfcElement;
PredefinedType : OPTIONAL IfcTransportElementTypeEnum;
CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR (PredefinedType <> IfcTransportElementTypeEnum.USERDEFINED) OR ((PredefinedType = IfcTransportElementTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));

Link to EXPRESS-G diagram EXPRESS-G diagram

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
GlobalId : IfcGloballyUniqueId;
OwnerHistory : OPTIONAL IfcOwnerHistory;
Name : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
ENTITY IfcObjectDefinition
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 IfcLabel;
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;
ReferencedBy : SET OF IfcRelAssignsToProduct FOR RelatingProduct;
ENTITY IfcElement
Tag : OPTIONAL IfcIdentifier;
FillsVoids : SET [0:1] OF IfcRelFillsElement FOR RelatedBuildingElement;
ConnectedTo : SET OF IfcRelConnectsElements FOR RelatingElement;
IsInterferedByElements : SET OF IfcRelInterferesElements FOR RelatedElement;
InterferesElements : SET OF IfcRelInterferesElements FOR RelatingElement;
HasProjections : SET OF IfcRelProjectsElement FOR RelatingElement;
ReferencedInStructures : SET OF IfcRelReferencedInSpatialStructure FOR RelatedElements;
HasOpenings : SET OF IfcRelVoidsElement FOR RelatingBuildingElement;
IsConnectionRealization : SET OF IfcRelConnectsWithRealizingElements FOR RealizingElements;
ProvidesBoundaries : SET OF IfcRelSpaceBoundary FOR RelatedBuildingElement;
ConnectedFrom : SET OF IfcRelConnectsElements FOR RelatedElement;
ContainedInStructure : SET [0:1] OF IfcRelContainedInSpatialStructure FOR RelatedElements;
ENTITY IfcTransportElement
PredefinedType : OPTIONAL IfcTransportElementTypeEnum;

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