IfcSlabType

Definition from IAI: The element type (IfcSlabType) defines a list of commonly shared property set definitions of a slab and an optional set of product representations. It is used to define a slab specification (i.e. the specific product information, that is common to all occurrences of that product type).

NOTE: The product representations are defined as representation maps (at the level of the supertype IfcTypeProduct, which gets assigned by an element occurrence instance through the IfcShapeRepresentation.Item[1] being an IfcMappedItem.

An IfcSlabType is used to define the common properties of a specific slab that may be applied to many instances of that type to assign a specific style. A slab type can be used for a floor slab, a roof slab, a stair landing or a ramp flight. Building element types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences.

The IfcSlabType can have common material (using the inverse relationship HasAssociations) or property set information (using HasPropertySets) assigned. If present, it does apply equally to all occurrences of the IfcSlabType. Property set information may be overridden at the occurrence.

The occurrences of the IfcSlabType are represented by instances of IfcSlab. or IfcRampFlight

HISTORY: New entity in Release IFC2x Edition 2.

Informal proposition:

The material assignment, if provided using the IfcRelAssociatesMaterial relationship, shall not reference the IfcMaterialLayerSetUsage.

EXPRESS specification:

ENTITY IfcSlabType

SUBTYPE OF (

IfcBuildingElementType);

PredefinedType

IfcSlabTypeEnum;

END_ENTITY;

Attribute definitions:

PredefinedType

Type of the slab.

Inheritance graph

ENTITY IfcSlabType;

ENTITY IfcRoot;

GlobalId

IfcGloballyUniqueId;

OwnerHistory

IfcOwnerHistory;

Name

OPTIONAL IfcLabel;

Description

OPTIONAL IfcText;

ENTITY IfcObjectDefinition;

INVERSE

HasAssignments

SET OF IfcRelAssigns FOR RelatedObjects;

IsDecomposedBy

SET OF IfcRelDecomposes FOR RelatingObject;

Decomposes

SET [0:1] OF IfcRelDecomposes FOR RelatedObjects;

HasAssociations

SET OF IfcRelAssociates FOR RelatedObjects;

ENTITY IfcTypeObject;

ApplicableOccurrence

OPTIONAL IfcLabel;

HasPropertySets

OPTIONAL SET [1:?] OF IfcPropertySetDefinition;

INVERSE

ObjectTypeOf

SET [0:1] OF IfcRelDefinesByType FOR RelatingType;

ENTITY IfcTypeProduct;

RepresentationMaps

OPTIONAL LIST [1:?] OF UNIQUE IfcRepresentationMap;

Tag

OPTIONAL IfcLabel;

ENTITY IfcElementType;

ElementType

OPTIONAL IfcLabel;

ENTITY IfcBuildingElementType;

ENTITY IfcSlabType;

PredefinedType

IfcSlabTypeEnum;

END_ENTITY;