IfcBuiltIn

IfcBuiltIn

Definition from IAI: The built in (IfcBuiltIn) defines the generalization for elements that are assembled on site; built-in and attached to the building permanently . It includes:

Cabinets - Storage enclosure, normally attached to a wall and/or floor. Typically includes doors and internal shelves.
Counter - Horizontal work or storage surface attached to a wall or covering the top of a cabinet.
Shelf - Horizontal work or storage surface, often designed with several surfaces on top of each other.

HISTORY New entity in IFC Release 1.0
ISSUE See issue log for changes made in IFC Release 1.5. See issue log for changes made in IFC Release 2x

Geometry Use Definitions

The geometric representation of IfcBuiltIn is given by the IfcProductDefinitionShape, allowing multiple geometric representation. Included are:

Local placement

The local placement for IfcBuiltIn 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 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.

Geometric Representation

The BoundingBox, the SurfaceModel and the Brep geometric representation of IfcBuiltIn is defined at the supertype IfcFurnishingElement.

EXPRESS specification:

ENTITY IfcBuiltIn

SUBTYPE OF (

IfcFurnishingElement);

PredefinedType

IfcBuiltInTypeEnum;

WHERE

WR1

(PredefinedType <> IfcBuiltInTypeEnum.USERDEFINED) OR ((PredefinedType = IfcBuiltInTypeEnum.USERDEFINED) AND EXISTS(SELF\IfcObject.ObjectType));

END_ENTITY;

Attribute definitions:

PredefinedType

Predefined generic types for a built-in that are specified in an Enum. There may be a property set given for the predefined types.

Formal Propositions:

WR1

The attribute UserDefinedType shall be given, if the predefined type is set to USERDEFINED.

References (1):

Name

Type

Referred through

Express-G

IfcFurnishingElement

Entity

Subtype

Diagram 1

Inheritance graph

ENTITY IfcBuiltIn;

ENTITY IfcRoot;

GlobalId

IfcGloballyUniqueId;

OwnerHistory

IfcOwnerHistory;

Name

OPTIONAL IfcLabel;

Description

OPTIONAL IfcText;

ENTITY IfcObject;

ObjectType

OPTIONAL IfcLabel;

INVERSE

IsDefinedBy

SET OF IfcRelDefines FOR RelatedObjects;

HasAssociations

SET OF IfcRelAssociates FOR RelatedObjects;

HasAssignments

SET OF IfcRelAssigns FOR RelatedObjects;

Decomposes

SET OF IfcRelDecomposes FOR RelatedObjects;

IsDecomposedBy

SET [0:1] OF IfcRelDecomposes FOR RelatingObject;

ENTITY IfcProduct;

ObjectPlacement

OPTIONAL IfcObjectPlacement;

Representation

OPTIONAL IfcProductRepresentation;

INVERSE

ReferencedBy

SET OF IfcRelAssignsToProduct FOR RelatingProduct;

ENTITY IfcElement;

Tag

OPTIONAL IfcIdentifier;

INVERSE

ConnectedTo

SET OF IfcRelConnectsElements FOR RelatingElement;

ConnectedFrom

SET OF IfcRelConnectsElements FOR RelatedElement;

ContainedInStructure

SET [0:1] OF IfcRelContainedInSpatialStructure FOR RelatedElements;

ENTITY IfcBuiltIn;

PredefinedType

IfcBuiltInTypeEnum;

END_ENTITY;