IfcBuildingElement

Natural language names
deBauteil / Bauelement
enBuilding Element
frElément de construction
Semantic definitions at the entity
Entity definition

The building element comprises all elements that are primarily part of the construction of a building, i.e., its structural and space separating system. Building elements are all physically existent and tangible things

NOTE  Definition from ISO 6707-1:
Major functional part of a building, examples are foundation, floor, roof, wall.

This IfcBuildingElement is a generalization of all elements that participate in a building system. Typical examples of IfcBuildingElement 's are (among others):

EXAMPLE  Building elements are walls, curtain wall, doors, columns, pile, and others.

The IfcBuildingElement is an abstract entity that cannot be instantiated. For arbitrary building elements, that cannot be expressed by a subtype of IfcBuildingElement, use IfcBuildingElementProxy.

HISTORY  New entity in IFC1.0
Formal Propositions
RuleDescription
MaxOneMaterialAssociationThere should be only a maximum of one material association assigned to an building element.
NOTE  The material association can assign a single material, a set of materials, a set of material layers, or a set of material profiles by a single association relationship.
FC2x4 CHANGE The where rule has been promoted from the subtype IfcWall.
Inherited definitions from supertypes
Entity inheritance IfcBeam IfcBuildingElementProxy IfcChimney IfcColumn IfcCovering IfcCurtainWall IfcDoor IfcFooting IfcMember IfcPile IfcPlate IfcRailing IfcRamp IfcRampFlight IfcRoof IfcShadingDevice IfcSlab IfcStair IfcStairFlight IfcWall IfcWindow IfcElement IfcProduct IfcObject IfcObjectDefinition IfcRoot
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRoot
1GlobalIdIfcGloballyUniqueId Assignment of a globally unique identifier within the entire software world. X
2OwnerHistoryIfcOwnerHistory? 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
3NameIfcLabel? 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
4DescriptionIfcText? Optional description, provided for exchanging informative comments.X
IfcObjectDefinition
HasAssignmentsIfcRelAssigns
@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
NestsIfcRelNests
@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
IsNestedByIfcRelNests
@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
HasContextIfcRelDeclares
@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
IsDecomposedByIfcRelAggregates
@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
DecomposesIfcRelAggregates
@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
HasAssociationsIfcRelAssociates
@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
5ObjectTypeIfcLabel? 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
IsDeclaredByIfcRelDefinesByObject
@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
DeclaresIfcRelDefinesByObject
@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
IsTypedByIfcRelDefinesByType
@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
IsDefinedByIfcRelDefinesByProperties
@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
6ObjectPlacementIfcObjectPlacement? 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
7RepresentationIfcProductRepresentation? 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
ReferencedByIfcRelAssignsToProduct
@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
IfcElement
8TagIfcIdentifier? 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
FillsVoidsIfcRelFillsElement
@RelatedBuildingElement
S[0:1]Reference to the IfcRelFillsElement Relationship that puts the element as a filling into the opening created within another element. X
ConnectedToIfcRelConnectsElements
@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
IsInterferedByElementsIfcRelInterferesElements
@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
InterferesElementsIfcRelInterferesElements
@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
HasProjectionsIfcRelProjectsElement
@RelatingElement
S[0:?]Projection relationship that adds a feature (using a Boolean union) to the IfcBuildingElement.X
ReferencedInStructuresIfcRelReferencedInSpatialStructure
@RelatedElements
S[0:?]Reference relationship to the spatial structure element, to which the element is additionally associated. This relationship may not be hierarchical, an element may be referenced by zero, one or many spatial structure elements.
IFC2x3 CHANGE  The inverse attribute has been added with upward compatibility for file based exchange.
X
HasOpeningsIfcRelVoidsElement
@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
IsConnectionRealizationIfcRelConnectsWithRealizingElements
@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
ProvidesBoundariesIfcRelSpaceBoundary
@RelatedBuildingElement
S[0:?]Reference to space boundaries by virtue of the objectified relationship IfcRelSpaceBoundary. It defines the concept of an element bounding spaces. X
ConnectedFromIfcRelConnectsElements
@RelatedElement
S[0:?]Reference to the element connection relationship. The relationship then refers to the other element that is connected to this element. X
ContainedInStructureIfcRelContainedInSpatialStructure
@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
HasCoveringsIfcRelCoversBldgElements
@RelatingBuildingElement
S[0:?]Reference to IfcCovering by virtue of the objectified relationship IfcRelCoversBldgElement. It defines the concept of an element having coverings associated.X
IfcBuildingElement
Definitions applying to General Usage

 Instance diagram


Concept usage

Property Sets for Objects

The Property Sets for Objects concept template applies to this entity as shown in Table 29.

PredefinedTypePsetNameProperties
 Pset_EnvironmentalImpactIndicators
 Pset_EnvironmentalImpactValues
 Pset_Condition
 Pset_ManufacturerOccurrence
 Pset_ManufacturerTypeInformation
 Pset_ServiceLife
 Pset_Warranty

Table 29 — IfcBuildingElement Property Sets for Objects



Product Assignment

The Product Assignment concept template applies to this entity as shown in Table 30.

TypeDescription
IfcTaskTask for operating upon the building element.

Table 30 — IfcBuildingElement Product Assignment



Spatial Containment

The Spatial Containment concept template applies to this entity as shown in Table 31.

RelatingStructure
IfcBuildingStorey
IfcBuilding
IfcSite

Table 31 — IfcBuildingElement Spatial Containment



Surface 3D Geometry

The Surface 3D Geometry concept applies to this entity.

Some IfcBuildingElement may be represented by an surface as an abstract geometric representation. See each subtype for specific guidance.



mvdXML Specification
<?xml version="1.0"?>
<ConceptRoot xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" uuid="0c92a9fe-71e3-40e5-b5bd-4e39c88519aa" name="IfcBuildingElement" status="sample" applicableRootEntity="IfcBuildingElement">
  <Concepts>
    <Concept uuid="79f3378b-ed50-4f17-a02a-50ef263bdfbb" name="Property Sets for Objects" status="sample" override="false">
      <Template ref="f74255a6-0c0e-4f31-84ad-24981db62461" />
    </Concept>
    <Concept uuid="4ca2bd3c-123b-4c4e-931f-6db8e951b60f" name="Product Assignment" status="sample" override="false">
      <Template ref="ec9cfb04-adfe-4868-8168-d78fe995a913" />
      <TemplateRules operator="and">
        <TemplateRule Description="Task for operating upon the building element." Parameters="Type[Type]='IfcTask'" />
      </TemplateRules>
    </Concept>
    <Concept uuid="88cc6775-1b72-4b5c-bff4-5d96a30581a0" name="Spatial Containment" status="sample" override="false">
      <Template ref="d9a3f822-0014-4bc2-8d94-9d9067759045" />
      <TemplateRules operator="and">
        <TemplateRule Parameters="RelatingStructure[Type]='IfcBuildingStorey'" />
        <TemplateRule Parameters="RelatingStructure[Type]='IfcBuilding'" />
        <TemplateRule Parameters="RelatingStructure[Type]='IfcSite'" />
      </TemplateRules>
    </Concept>
    <Concept uuid="e18a7464-340a-445f-ab6c-3d1fe994c8e4" name="Surface 3D Geometry" status="sample" override="false">
      <Template ref="bd82983d-39d5-41b2-9ee8-f3bd8777d315" />
    </Concept>
  </Concepts>
</ConceptRoot>
Concept inheritance

#ConceptTemplateModel View
IfcRoot
IdentitySoftware IdentityGeneral Usage
Revision ControlRevision ControlGeneral Usage
IfcObject
Object Occurrence Predefined TypeObject Predefined TypeGeneral Usage
IfcProduct
Product PlacementProduct PlacementGeneral Usage
Product Geometric RepresentationProduct Geometric RepresentationGeneral Usage
IfcElement
Product Local PlacementProduct Local PlacementGeneral Usage
CoG GeometryCoG GeometryGeneral Usage
Box GeometryBox GeometryGeneral Usage
FootPrint GeometryFootPrint GeometryGeneral Usage
Body SurfaceOrSolidModel GeometryBody SurfaceOrSolidModel GeometryGeneral Usage
Body SurfaceModel GeometryBody SurfaceModel GeometryGeneral Usage
Body Tessellation GeometryBody Tessellation GeometryGeneral Usage
Body Brep GeometryBody Brep GeometryGeneral Usage
Body AdvancedBrep GeometryBody AdvancedBrep GeometryGeneral Usage
Body CSG GeometryBody CSG GeometryGeneral Usage
Mapped GeometryMapped GeometryGeneral Usage
IfcBuildingElement
Property Sets for ObjectsProperty Sets for ObjectsGeneral Usage
Product AssignmentProduct AssignmentGeneral Usage
Spatial ContainmentSpatial ContainmentGeneral Usage
Surface 3D GeometrySurface 3D GeometryGeneral Usage
Formal representations
XML Specification
 <xs:element name="IfcBuildingElement" type="ifc:IfcBuildingElement" abstract="true" substitutionGroup="ifc:IfcElement" nillable="true"/>
 <xs:complexType name="IfcBuildingElement" abstract="true">
  <xs:complexContent>
   <xs:extension base="ifc:IfcElement"/>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcBuildingElement
 ABSTRACT SUPERTYPE OF(ONEOF(IfcBeam, IfcBuildingElementProxy, IfcChimney, IfcColumn, IfcCovering, IfcCurtainWall, IfcDoor, IfcFooting, IfcMember, IfcPile, IfcPlate, IfcRailing, IfcRamp, IfcRampFlight, IfcRoof, IfcShadingDevice, IfcSlab, IfcStair, IfcStairFlight, IfcWall, IfcWindow))
 SUBTYPE OF (IfcElement);
 WHERE
  MaxOneMaterialAssociation : SIZEOF (QUERY(temp <* SELF\IfcObjectDefinition.HasAssociations |
'IFCPRODUCTEXTENSION.IfcRelAssociatesMaterial' IN TYPEOF(temp)
)) <= 1;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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