#### 6.1.3.12 IfcWallElementedCase

| 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:

- having components being assigned to the IfcWallElementedCase using the IfcRelAggregates relationship accessible by the inverse relationship IsDecomposedBy.
- applying the constraint that the parts within the decomposition shall be of type IfcMember, IfcPlate, IfcBuildingElementPart or IfcBuildingElementProxy.

> 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 113, 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 113 — Wall elemented voiding

Geometric Representation

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

- Axis: A two-dimensional open curve being a subtype of IfcBoundedCurve defining the axis for the elemented wall. It maybe used as a simplified representation directly at the elemented wall.
- Surface: A three-dimensional surface being a subtype of IfcBoundedSurface defining the reference surface for the elemented wall. It maybe used as a simplified representation directly at the elemented wall.

## Plumbing System Design

The following concepts are inherited at supertypes:

- IfcWall: Path Connectivity, Voiding

Instance diagram

Identity

The Identity concept applies to this entity.

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  |  |  |  |  |  |  |  |  |
Export |  |  |  |  |  |  |  | R |  |  | R | R | R

Aggregation

The Aggregation concept applies to this entity as shown in Table 40.

PredefinedType | RelatedObjects | Description
--- | --- | ---
| IfcMember | Studs, sole plates, top plates.
| IfcPlate | Sheathing, panels, drywall.
| IfcBuildingElementPart | Insulation, other elements.
| IfcBeam | Lintels over doors or windows.
Table 40 — IfcWallElementedCase Aggregation

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  |  |  |  |  |  |  |  |  |
Export |  |  |  |  |  |  |  | O |  |  | O | O | O

Placement

The Placement concept applies to this entity.

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  |  |  |  |  |  |  |  |  |
Export |  |  |  |  |  |  |  | R |  |  | R | R | R

Axis Geometry

The Axis Geometry concept applies to this entity as shown in Table 41.

RepresentationType | Geometry
--- | ---
Curve2D | IfcBoundedCurve
Table 41 — IfcWallElementedCase Axis Geometry

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  |  |  |  |  |  |  |  |  |
Export |  |  |  |  |  |  |  | R |  |  | R | R | R

Surface Geometry

The Surface Geometry concept applies to this entity as shown in Table 42.

RepresentationType | Geometry
--- | ---
Surface3D | IfcBoundedSurface
Table 42 — IfcWallElementedCase Surface Geometry

The surfacic geometric representation of IfcWallElementedCase is defined using the 'Surface' representation.

- RepresentationIdentifier : 'Surface'
- RepresentationType : 'Surface3D'

> 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.

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  |  |  |  |  |  |  |  |  |
Export |  |  |  |  |  |  |  | O |  |  | O | O | O

Spatial Containment

The Spatial Containment concept applies to this entity as shown in Table 43.

Structure | Description
--- | ---
IfcSite | Walls exterior to a building are contained within a site.
IfcBuildingStorey | All walls within a building are contained within a building storey.
Table 43 — IfcWallElementedCase Spatial Containment

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  |  |  |  |  |  |  |  |  |
Export |  |  |  |  |  |  |  | R |  |  | R | R | R

XSD Specification:

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

EXPRESS Specification:

ENTITY IfcWallElementedCase

| SUBTYPE OF (IfcWall);

| WHERE

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

END_ENTITY;

Formal Propositions:

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

Inheritance Graph:

ENTITY IfcWallElementedCase

| ENTITY IfcRoot

GlobalId | : | IfcGloballyUniqueId;
OwnerHistory | : | OPTIONAL IfcOwnerHistory;
Name | : | OPTIONAL IfcLabel;
Description | : | OPTIONAL IfcText;

| ENTITY IfcObjectDefinition

| INVERSE

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 IfcStrippedOptional;

| INVERSE

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;

| INVERSE

ReferencedBy | : | SET OF IfcRelAssignsToProduct FOR RelatingProduct;

| ENTITY IfcElement

Tag | : | OPTIONAL IfcStrippedOptional;

| INVERSE

ConnectedTo | : | SET OF IfcRelConnectsElements FOR RelatingElement;
IsInterferedByElements | : | SET OF IfcRelInterferesElements FOR RelatedElement;
InterferesElements | : | SET OF IfcRelInterferesElements FOR RelatingElement;
HasOpenings | : | SET OF IfcRelVoidsElement FOR RelatingBuildingElement;
ProvidesBoundaries | : | SET OF IfcRelSpaceBoundary FOR RelatedBuildingElement;
ConnectedFrom | : | SET OF IfcRelConnectsElements FOR RelatedElement;
ContainedInStructure | : | SET [0:1] OF IfcRelContainedInSpatialStructure FOR RelatedElements;

| ENTITY IfcBuildingElement

| INVERSE

| ENTITY IfcWall

PredefinedType | : | OPTIONAL IfcStrippedOptional;

| ENTITY IfcWallElementedCase

END_ENTITY;

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