Wand elementiert
Mur composite

The IfcWallElementedCase defines a wall with certain constraints for the provision of its components. The IfcWallElementedCase handles all cases of walls, that are decomposed into parts: 

HISTORY  New entity in IFC4.

Property Set Use Definition:

The property sets relating to the IfcWallElementedCase are defined at the supertype IfcWall.

NOTE  The parts within the decomposition relationship may define their own property sets.

Quantity Use Definition:

The quantities relating to the IfcWallElementedCase are defined at the supertype IfcWall.

NOTE  The parts within the decomposition relationship may define their own individual quantities.

Voiding Use Definition:

As shown in Figure 219, openings within the composite wall are directly assigned to IfcWallElementedCase using IfcRelVoidsElement pointing to IfcOpeningElement and apply to all aggregated parts. If individual parts have cutting and other voiding features, then the decomposed parts have a separate voiding relationship IfcRelVoidsElement pointing to IfcVoidingFeature.


Figure 219 — Wall elemented voiding

Geometric Representation

The standard geometric representation of IfcWallElementedCase is defined using the following multiple shape representations for its definition:

Common Use Definitions

The following concepts are inherited at supertypes:

 Instance diagram

Object Aggregation

The Object Aggregation concept applies to this entity as shown in Table 191.
 IfcMemberStuds, sole plates, top plates.
 IfcPlateSheathing, panels, drywall.
 IfcBuildingElementPartInsulation, other elements.
 IfcBeamLintels over doors or windows.

Table 191 — IfcWallElementedCase Object Aggregation

Product Placement

The Product Placement concept applies to this entity as shown in Table 192.
IfcLocalPlacementIfcLocalPlacementRelative placement according to position and rotation relative to container.
IfcLocalPlacement Absolute placement according to position and rotation of world coordinate system.
IfcGridPlacement Placement according to grid intersection.

Table 192 — IfcWallElementedCase Product Placement

The use of local placement is defined at the supertype IfcWall. The local placement of the IfcWallElementedCase defines the parent coordinate systems for the parts within the decomposition. All parts shall be positioned relative to the IfcWallElementedCase.

Surface Geometry

The Surface Geometry concept applies to this entity.

NOTE  The 'Surface' can be used to define a surfacic model of the building (e.g. for analytical purposes, or for reduced Level of Detail representation). It could suppress the geometric details of the parts in the decomposition.
NOTE  It is invalid to exchange a 'Body' shape representation of an IfcWallElementedCase. The body geometry is defined by the parts within the decomposition.

XSD Specification:

 <xs:element name="IfcWallElementedCase" type="ifc:IfcWallElementedCase" substitutionGroup="ifc:IfcWall" nillable="true"/>
 <xs:complexType name="IfcWallElementedCase">
   <xs:extension base="ifc:IfcWall"/>

EXPRESS Specification:

ENTITY IfcWallElementedCase
HasDecomposition : HIINDEX(SELF\IfcObjectDefinition.IsDecomposedBy) > 0;

Link to EXPRESS-G diagram EXPRESS-G diagram

Formal Propositions:

HasDecomposition : A valid instance of IfcWallElementedCase has to have parts in a decomposition hierarchy.

Inheritance Graph:

ENTITY IfcWallElementedCase
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 IfcBuildingElement
HasCoverings : SET OF IfcRelCoversBldgElements FOR RelatingBuildingElement;
PredefinedType : OPTIONAL IfcWallTypeEnum;
ENTITY IfcWallElementedCase

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