Accessoire composé
Zusatzgerät / Einbauteil

A discrete accessory is a representation of different kinds of accessories included in or added to elements.

HISTORY  New entity in IFC2x2.
IFC4 CHANGE  Attribute PredefinedType added.

Common Use Definitions

The following concepts are inherited at supertypes:

 Instance diagram

Object Typing

The Object Typing concept applies to this entity as shown in Table 225.

Table 225 — IfcDiscreteAccessory Object Typing

Property Sets for Objects

The Property Sets for Objects concept applies to this entity as shown in Table 226.
Corner fixing platePset_DiscreteAccessoryCornerFixingPlate
Diagonal truss connectorPset_DiscreteAccessoryDiagonalTrussConnector
Edge fixing platePset_DiscreteAccessoryEdgeFixingPlate
Fixing socketPset_DiscreteAccessoryFixingSocket
Ladder truss connectorPset_DiscreteAccessoryLadderTrussConnector
Standard fixing platePset_DiscreteAccessoryStandardFixingPlate
Wire loopPset_DiscreteAccessoryWireLoop

Table 226 — IfcDiscreteAccessory Property Sets for Objects

XSD Specification:

 <xs:element name="IfcDiscreteAccessory" type="ifc:IfcDiscreteAccessory" substitutionGroup="ifc:IfcElementComponent" nillable="true"/>
 <xs:complexType name="IfcDiscreteAccessory">
   <xs:extension base="ifc:IfcElementComponent">
    <xs:attribute name="PredefinedType" type="ifc:IfcDiscreteAccessoryTypeEnum" use="optional"/>

EXPRESS Specification:

ENTITY IfcDiscreteAccessory
SUBTYPE OF IfcElementComponent;
PredefinedType : OPTIONAL IfcDiscreteAccessoryTypeEnum;
CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR (PredefinedType <> IfcDiscreteAccessoryTypeEnum.USERDEFINED) OR ((PredefinedType = IfcDiscreteAccessoryTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));

Link to EXPRESS-G diagram EXPRESS-G diagram

Attribute Definitions:

PredefinedType : Subtype of discrete accessory. If USERDEFINED, the type is further qualified by means of the inherited attribute ObjectType. Refer to IfcDiscreteAccessoryType for a non-exclusive list of userdefined type designations which are applicable to IfcDiscreteAccessory as well.

Formal Propositions:

CorrectPredefinedType : Either the PredefinedType attribute is unset (e.g. because an IfcDiscreteAccessoryType is associated), or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED.
CorrectTypeAssigned : If this occurrence is defined by a type object, the latter has to be an IfcDiscreteAccessoryType.

Inheritance Graph:

ENTITY IfcDiscreteAccessory
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 IfcElementComponent
ENTITY IfcDiscreteAccessory
PredefinedType : OPTIONAL IfcDiscreteAccessoryTypeEnum;

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