IfcWallElementedCase

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

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	G
IfcRoot
1	GlobalId	IfcGloballyUniqueId		Assignment of a globally unique identifier within the entire software world.	X
2	OwnerHistory	IfcOwnerHistory	?	Assignment of the information about the current ownership of that object, including owning actor, application, local identification and information captured about the recent changes of the object, NOTE only the last modification in stored - either as addition, deletion or modification. IFC4 CHANGE The attribute has been changed to be OPTIONAL.	X
3	Name	IfcLabel	?	Optional name for use by the participating software systems or users. For some subtypes of IfcRoot the insertion of the Name attribute may be required. This would be enforced by a where rule.	X
4	Description	IfcText	?	Optional description, provided for exchanging informative comments.	X
IfcObjectDefinition
	HasAssignments	IfcRelAssigns @RelatedObjects	S[0:?]	Reference to the relationship objects, that assign (by an association relationship) other subtypes of IfcObject to this object instance. Examples are the association to products, processes, controls, resources or groups.	X
	Nests	IfcRelNests @RelatedObjects	S[0:1]	References to the decomposition relationship being a nesting. It determines that this object definition is a part within an ordered whole/part decomposition relationship. An object occurrence or type can only be part of a single decomposition (to allow hierarchical strutures only). IFC4 CHANGE The inverse attribute datatype has been added and separated from Decomposes defined at IfcObjectDefinition.	X
	IsNestedBy	IfcRelNests @RelatingObject	S[0:?]	References to the decomposition relationship being a nesting. It determines that this object definition is the whole within an ordered whole/part decomposition relationship. An object or object type can be nested by several other objects (occurrences or types). IFC4 CHANGE The inverse attribute datatype has been added and separated from IsDecomposedBy defined at IfcObjectDefinition.	X
	HasContext	IfcRelDeclares @RelatedDefinitions	S[0:1]	References to the context providing context information such as project unit or representation context. It should only be asserted for the uppermost non-spatial object. IFC4 CHANGE The inverse attribute datatype has been added.	X
	IsDecomposedBy	IfcRelAggregates @RelatingObject	S[0:?]	References to the decomposition relationship being an aggregation. It determines that this object definition is whole within an unordered whole/part decomposition relationship. An object definitions can be aggregated by several other objects (occurrences or parts). IFC4 CHANGE The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates.	X
	Decomposes	IfcRelAggregates @RelatedObjects	S[0:1]	References to the decomposition relationship being an aggregation. It determines that this object definition is a part within an unordered whole/part decomposition relationship. An object definitions can only be part of a single decomposition (to allow hierarchical strutures only). IFC4 CHANGE The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates.	X
	HasAssociations	IfcRelAssociates @RelatedObjects	S[0:?]	Reference to the relationship objects, that associates external references or other resource definitions to the object.. Examples are the association to library, documentation or classification.	X
IfcObject
5	ObjectType	IfcLabel	?	The type denotes a particular type that indicates the object further. The use has to be established at the level of instantiable subtypes. In particular it holds the user defined type, if the enumeration of the attribute PredefinedType is set to USERDEFINED.	X
	IsDeclaredBy	IfcRelDefinesByObject @RelatedObjects	S[0:1]	Link to the relationship object pointing to the declaring object that provides the object definitions for this object occurrence. The declaring object has to be part of an object type decomposition. The associated IfcObject, or its subtypes, contains the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring IfcObject, or its subtypes. IFC4 CHANGE New inverse relationship, change made with upward compatibility for file based exchange.	X
	Declares	IfcRelDefinesByObject @RelatingObject	S[0:?]	Link to the relationship object pointing to the reflected object(s) that receives the object definitions. The reflected object has to be part of an object occurrence decomposition. The associated IfcObject, or its subtypes, provides the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring IfcObject, or its subtypes. IFC4 CHANGE New inverse relationship, change made with upward compatibility for file based exchange.	X
	IsTypedBy	IfcRelDefinesByType @RelatedObjects	S[0:1]	Set of relationships to the object type that provides the type definitions for this object occurrence. The then associated IfcTypeObject, or its subtypes, contains the specific information (or type, or style), that is common to all instances of IfcObject, or its subtypes, referring to the same type. IFC4 CHANGE New inverse relationship, the link to IfcRelDefinesByType had previously be included in the inverse relationship IfcRelDefines. Change made with upward compatibility for file based exchange.	X
	IsDefinedBy	IfcRelDefinesByProperties @RelatedObjects	S[0:?]	Set of relationships to property set definitions attached to this object. Those statically or dynamically defined properties contain alphanumeric information content that further defines the object. IFC4 CHANGE The data type has been changed from IfcRelDefines to IfcRelDefinesByProperties with upward compatibility for file based exchange.	X
IfcProduct
6	ObjectPlacement	IfcObjectPlacement	?	Placement of the product in space, the placement can either be absolute (relative to the world coordinate system), relative (relative to the object placement of another product), or constraint (e.g. relative to grid axes). It is determined by the various subtypes of IfcObjectPlacement, which includes the axis placement information to determine the transformation for the object coordinate system.	X
7	Representation	IfcProductRepresentation	?	Reference to the representations of the product, being either a representation (IfcProductRepresentation) or as a special case a shape representations (IfcProductDefinitionShape). The product definition shape provides for multiple geometric representations of the shape property of the object within the same object coordinate system, defined by the object placement.	X
	ReferencedBy	IfcRelAssignsToProduct @RelatingProduct	S[0:?]	Reference to the IfcRelAssignsToProduct relationship, by which other products, processes, controls, resources or actors (as subtypes of IfcObjectDefinition) can be related to this product.	X
	PositionedRelativeTo	IfcRelPositions @RelatedProducts	S[0:1]		X
	ReferencedInStructures	IfcRelReferencedInSpatialStructure @RelatedElements	S[0:?]		X
IfcElement
8	Tag	IfcIdentifier	?	The tag (or label) identifier at the particular instance of a product, e.g. the serial number, or the position number. It is the identifier at the occurrence level.	X
	FillsVoids	IfcRelFillsElement @RelatedBuildingElement	S[0:1]	Reference to the IfcRelFillsElement Relationship that puts the element as a filling into the opening created within another element.	X
	ConnectedTo	IfcRelConnectsElements @RelatingElement	S[0:?]	Reference to the element connection relationship. The relationship then refers to the other element to which this element is connected to.	X
	IsInterferedByElements	IfcRelInterferesElements @RelatedElement	S[0:?]	Reference to the interference relationship to indicate the element that is interfered. The relationship, if provided, indicates that this element has an interference with one or many other elements. NOTE There is no indication of precedence between IsInterferedByElements and InterferesElements. IFC4 CHANGE New inverse relationship.	X
	InterferesElements	IfcRelInterferesElements @RelatingElement	S[0:?]	Reference to the interference relationship to indicate the element that interferes. The relationship, if provided, indicates that this element has an interference with one or many other elements. NOTE There is no indication of precedence between IsInterferedByElements and InterferesElements. IFC4 CHANGE New inverse relationship.	X
	HasProjections	IfcRelProjectsElement @RelatingElement	S[0:?]	Projection relationship that adds a feature (using a Boolean union) to the IfcBuildingElement.	X
	HasOpenings	IfcRelVoidsElement @RelatingBuildingElement	S[0:?]	Reference to the IfcRelVoidsElement relationship that creates an opening in an element. An element can incorporate zero-to-many openings. For each opening, that voids the element, a new relationship IfcRelVoidsElement is generated.	X
	IsConnectionRealization	IfcRelConnectsWithRealizingElements @RealizingElements	S[0:?]	Reference to the connection relationship with realizing element. The relationship, if provided, assigns this element as the realizing element to the connection, which provides the physical manifestation of the connection relationship.	X
	ProvidesBoundaries	IfcRelSpaceBoundary @RelatedBuildingElement	S[0:?]	Reference to space boundaries by virtue of the objectified relationship IfcRelSpaceBoundary. It defines the concept of an element bounding spaces.	X
	ConnectedFrom	IfcRelConnectsElements @RelatedElement	S[0:?]	Reference to the element connection relationship. The relationship then refers to the other element that is connected to this element.	X
	ContainedInStructure	IfcRelContainedInSpatialStructure @RelatedElements	S[0:1]	Containment relationship to the spatial structure element, to which the element is primarily associated. This containment relationship has to be hierachical, i.e. an element may only be assigned directly to zero or one spatial structure.	X
	HasCoverings	IfcRelCoversBldgElements @RelatingBuildingElement	S[0:?]	Reference to IfcCovering by virtue of the objectified relationship IfcRelCoversBldgElement. It defines the concept of an element having coverings associated.	X
IfcBuiltElement
IfcWall
9	PredefinedType	IfcWallTypeEnum	?	Predefined generic type for a wall that is specified in an enumeration. There may be a property set given specifically for the predefined types. NOTE The PredefinedType shall only be used, if no IfcWallType is assigned, providing its own IfcWallType.PredefinedType. IFC4 CHANGE The attribute has been added at the end of the entity definition.	X
IfcWallElementedCase

Definitions applying to General Usage

Instance diagram

Concept usage

Product Local Placement

The Product Local Placement concept template applies to this entity as shown in Table 204.

Table 204 — IfcWallElementedCase Product Local 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.

The 'Surface Geometry' shape representation 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.

Element Decomposition

The Element Decomposition concept template applies to this entity as shown in Table 205.

IsDecomposedBy	RelatedObjects	Description
	IfcElementAssembly	Frame containing studs, tracks, and possibly insulation
	IfcBuildingElementPart	Panels on each side such as gypsum (drywall) or cement board (tile backing) with fasteners

Table 205 — IfcWallElementedCase Element Decomposition

An elemented wall is decomposed into parts for particular components such as framing and panels on each side. There must be an object corresponding to each type of part, however there may be single object instance indicating multiple placements (via mapping geometry) for each part, or multiple instances corresponding to each placement. For minimizing file size, it is recommended to use a single object with multiple placement unless there are specific connectivity relationships indicated (e.g. a junction box connected to a specific stud).

Element Voiding

The Element Voiding concept template applies to this entity as shown in Table 206.

Table 206 — IfcWallElementedCase Element Voiding

As shown in Figure 252, 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 252 — Wall elemented voiding

mvdXML Specification


<?xml version="1.0" encoding="utf-8"?>

<ConceptRoot xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" uuid="7234582b-3e33-44fe-ae26-21f8e24bfc68" name="IfcWallElementedCase" applicableRootEntity="IfcWallElementedCase">

 <Applicability>

  <Template ref="37de502b-e4e9-46dd-bbda-e3b7e983b4e7" />

  <TemplateRules operator="and">

  </TemplateRules>

 </Applicability>

 <Concepts>

  <Concept uuid="982edf62-3924-43e5-99f0-e13c10669a25" name="Product Local Placement">

   <Template ref="cbe85b5f-7912-4a43-8bb7-1e63bf40b26d" />

  </Concept>

  <Concept uuid="f9ea8de5-6955-47ae-a9dc-d04f10964ece" name="Surface Geometry">

   <Template ref="2e99de70-fb73-478f-9bca-4fedfdeb4ea5" />

  </Concept>

  <Concept uuid="690cfae5-8fb2-4c83-800a-9a793f0c0c8e" name="Element Decomposition">

   <Template ref="8a27c15a-c4ea-4ca9-8cce-7fbba1c9bce0" />

   <TemplateRules operator="and">

    <TemplateRule Description="Frame containing studs, tracks, and possibly insulation" Parameters="RelatedObjects[Type]=&apos;IfcElementAssembly&apos;" />

    <TemplateRule Description="Panels on each side such as gypsum (drywall) or cement board (tile backing) with fasteners" Parameters="RelatedObjects[Type]=&apos;IfcBuildingElementPart&apos;" />

   </TemplateRules>

  </Concept>

  <Concept uuid="79db20d2-4de5-4dd3-9394-8804b48a6ff2" name="Element Voiding">

   <Template ref="b9005e79-b5c5-4c0b-9d86-046c21ad420d" />

  </Concept>

 </Concepts>

</ConceptRoot>

Concept inheritance

#	Concept	Template	Model View
IfcRoot
	Identity	Software Identity	General Usage
	Revision Control	Revision Control	General Usage
IfcObjectDefinition
	Classification Association	Classification Association	General Usage
IfcObject
	Object User Identity	Object User Identity	General Usage
	Object Predefined Type	Object Predefined Type	General Usage
	Property Sets with Override	Property Sets with Override	General Usage
IfcProduct
	Product Placement	Product Placement	General Usage
	Product Geometric Representation	Product Geometric Representation	General Usage
IfcElement
	CoG Geometry	CoG Geometry	General Usage
	Box Geometry	Box Geometry	General Usage
	FootPrint Geometry	FootPrint Geometry	General Usage
	Body SurfaceOrSolidModel Geometry	Body SurfaceOrSolidModel Geometry	General Usage
	Body SurfaceModel Geometry	Body SurfaceModel Geometry	General Usage
	Body Tessellation Geometry	Body Tessellation Geometry	General Usage
	Body Brep Geometry	Body Brep Geometry	General Usage
	Body AdvancedBrep Geometry	Body AdvancedBrep Geometry	General Usage
	Body CSG Geometry	Body CSG Geometry	General Usage
	Mapped Geometry	Mapped Geometry	General Usage
	Element Projecting	Element Projecting	General Usage
	Linear Placement	Product Linear Placement	General Usage
IfcBuiltElement
	Surface 3D Geometry	Surface 3D Geometry	General Usage
IfcWall
	Object Typing	Object Typing	General Usage
	Property Sets for Objects	Property Sets for Objects	General Usage
	Quantity Sets	Quantity Sets	General Usage
	Material Layer Set	Material Layer Set	General Usage
	Path Connectivity	Path Connectivity	General Usage
	Spatial Containment	Spatial Containment	General Usage
	Axis 2D Geometry	Axis 2D Geometry	General Usage
	Body SweptSolid Geometry	Body SweptSolid Geometry	General Usage
	Body Clipping Geometry	Body Clipping Geometry	General Usage
	Product Assignment	Product Assignment	General Usage
IfcWallElementedCase
	Product Local Placement	Product Local Placement	General Usage
	Surface Geometry	Surface Geometry	General Usage
	Element Decomposition	Element Decomposition	General Usage
	Element Voiding	Element Voiding	General Usage

Item	Change	Description
IFC2x3 to IFC4 4.0.0.0
IfcWallElementedCase	ADDED
IFC4 Addendum 2 Technical Corrigendum 1 4.0.2.1
IfcWallElementedCase	MODIFIED	Status changed to Deprecated.
IFC4x2 Candidate 4.2.0.0
IfcWallElementedCase
PositionedRelativeTo	ADDED
IFC2x3 to IFC4 4.0.0.0
IfcWallElementedCase	ADDED
IFC4 Addendum 2 Technical Corrigendum 1 4.0.2.1
IfcWallElementedCase	MODIFIED	Status changed to Deprecated.
IFC4x2 Candidate 4.2.0.0
IfcWallElementedCase
PositionedRelativeTo	ADDED

IfcWallElementedCase

Semantic definitions at the entity

Inherited definitions from supertypes

Definitions applying to General Usage

Formal representations

	Wand elementiert
	Wall Elemented Case
	Mur composite