IfcElement

Natural language names
Element (allgemein)
Element
Élément
Semantic definitions at the entity
Entity definition

An element is a generalization of all components that make up an AEC product.

Elements are physically existent objects, although they might be void elements, such as holes. Elements either remain permanently in the AEC product, or only temporarily, as formwork does. Elements can be either assembled on site or pre-manufactured and built in on site.

EXAMPLE  Examples of elements in a building construction context are walls, floors, windows and recesses.

The elements can be logically contained by a spatial structure element that constitutes a certain level within a project structure hierarchy (site, building, storey or space). This is done by using the IfcRelContainedInSpatialStructure relationship. An element can have material and quantity information assigned through the IfcRelAssociatesMaterial and IfcRelDefinesByProperties relationship.

In addition an element can be declared to be a specific occurrence of an element type (and thereby be defined by the element type properties) using the IfcRelDefinesByType relationship. An element can also be defined as an element assembly that is a group of semantically and topologically related elements that form a higher level part of the AEC product. Those element assemblies are defined by virtue of the IfcRelAggregates relationship.

EXAMPLE  Examples for element assembly are complete Roof Structures, made by several Roof Areas, or a Stair, composed by Flights and Landings.

Elements that performs the same function may be grouped by an "Element Group By Function". It is realized by an instance of IfcGroup with the ObjectType ='ElementGroupByFunction'.

HISTORY  New entity in IFC1.0
Attribute definitions
#AttributeTypeCardinalityDescription G
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
Inherited definitions from supertypes
Entity inheritance IfcBuildingElement IfcCivilElement IfcDistributionElement IfcElementAssembly IfcElementComponent IfcFeatureElement IfcFurnishingElement IfcGeographicElement IfcTransportElement IfcVirtualElement 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
PositionedRelativeToIfcRelPositions
@RelatedProducts
S[0:1]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
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 51.

PsetNameProperties
Pset_EnvironmentalImpactIndicators
TemplatePropertyNameValueReference
Single ValueReferenceIfcIdentifier
Single ValueFunctionalUnitReferenceIfcLabel
Single ValueUnitIfcText
Single ValueExpectedServiceLifeIfcTimeMeasure
Single ValueTotalPrimaryEnergyConsumptionPerUnitIfcEnergyMeasure
Single ValueWaterConsumptionPerUnitIfcVolumeMeasure
Single ValueHazardousWastePerUnitIfcMassMeasure
Single ValueNonHazardousWastePerUnitIfcMassMeasure
Single ValueClimateChangePerUnitIfcMassMeasure
Single ValueAtmosphericAcidificationPerUnitIfcMassMeasure
Single ValueRenewableEnergyConsumptionPerUnitIfcEnergyMeasure
Single ValueNonRenewableEnergyConsumptionPerUnitIfcEnergyMeasure
Single ValueResourceDepletionPerUnitIfcMassMeasure
Single ValueInertWastePerUnitIfcMassMeasure
Single ValueRadioactiveWastePerUnitIfcMassMeasure
Single ValueStratosphericOzoneLayerDestructionPerUnitIfcMassMeasure
Single ValuePhotochemicalOzoneFormationPerUnitIfcMassMeasure
Single ValueEutrophicationPerUnitIfcMassMeasure
Enumerated ValueLifeCyclePhaseIfcLabel
Pset_EnvironmentalImpactValues
TemplatePropertyNameValue
Single ValueTotalPrimaryEnergyConsumptionIfcEnergyMeasure
Single ValueWaterConsumptionIfcVolumeMeasure
Single ValueHazardousWasteIfcMassMeasure
Single ValueNonHazardousWasteIfcMassMeasure
Single ValueClimateChangeIfcMassMeasure
Single ValueAtmosphericAcidificationIfcMassMeasure
Single ValueRenewableEnergyConsumptionIfcEnergyMeasure
Single ValueNonRenewableEnergyConsumptionIfcEnergyMeasure
Single ValueResourceDepletionIfcMassMeasure
Single ValueInertWasteIfcMassMeasure
Single ValueRadioactiveWasteIfcMassMeasure
Single ValueStratosphericOzoneLayerDestructionIfcMassMeasure
Single ValuePhotochemicalOzoneFormationIfcMassMeasure
Single ValueEutrophicationIfcMassMeasure
Single ValueLeadInTimeIfcDuration
Single ValueDurationIfcDuration
Single ValueLeadOutTime
Pset_Condition
TemplatePropertyNameValue
Single ValueAssessmentDateIfcDate
Single ValueAssessmentConditionIfcLabel
Single ValueAssessmentDescriptionIfcText
Pset_ManufacturerOccurrence
TemplatePropertyNameValueReference
Single ValueAcquisitionDateIfcDate
Single ValueBarCodeIfcIdentifier
Single ValueSerialNumberIfcIdentifier
Single ValueBatchReferenceIfcIdentifier
Enumerated ValueAssemblyPlaceIfcLabel
Pset_ManufacturerTypeInformation
TemplatePropertyNameValueReference
Single ValueGlobalTradeItemNumberIfcIdentifier
Single ValueArticleNumberIfcIdentifier
Single ValueModelReferenceIfcLabel
Single ValueModelLabelIfcLabel
Single ValueManufacturerIfcLabel
Single ValueProductionYearIfcLabel
Enumerated ValueAssemblyPlaceIfcLabel
Pset_ServiceLife
TemplatePropertyNameValueUpperValueLowerValueSetValue
Single ValueMeanTimeBetweenFailureIfcDuration
Bounded ValueServiceLifeDurationIfcDuration
Pset_Warranty
TemplatePropertyNameValue
Single ValueWarrantyIdentifierIfcIdentifier
Single ValueWarrantyStartDateIfcDate
Single ValueWarrantyEndDateIfcDate
Single ValueIsExtendedWarrantyIfcBoolean
Single ValueWarrantyPeriodIfcTimeMeasure
Single ValueWarrantyContentIfcText
Single ValueExclusionsIfcText

Table 51 — IfcElement Property Sets for Objects



Product Local Placement

The Product Local Placement concept template applies to this entity as shown in Table 52.

HasPlacementRelativeToElementDescription
IfcLocalPlacementRelative placement according to position and rotation relative to container.

Table 52 — IfcElement Product Local Placement

The object placement for any subtype of IfcElement is defined by the IfcObjectPlacement, either IfcLocalPlacement or IfcGridPlacement, which defines the local object coordinate system that is referenced by all geometric representations of that IfcElement.



CoG Geometry

The CoG Geometry concept applies to this entity.

The 'CoG', Center of Gravity, shape representation is used as a means to verify the correct import by comparing the CoG of the imported geometry with the explicily provided CoG created during export.



Box Geometry

The Box Geometry concept applies to this entity.

bounding box
EXAMPLE  Any IfcElement may be represented by a bounding box, which shows the maximum extend of the body within the object coordinate system established by the IfcObjectPlacement. As shown in Figure 153, the bounding box representation is given by an IfcShapeRepresentation that includes a single item, an IfcBoundingBox.

Figure 153 — Building element box representation

 


FootPrint Geometry

The FootPrint Geometry concept template applies to this entity as shown in Table 53.

IdentifierTypeItemsDescription
FootPrintGeometricCurveSetAny collection of points and curves representing the floor plan projection.
FootPrintAnnotation2DAny collection of points and curves, and additional hatching and text representing the floor plan projection.

Table 53 — IfcElement FootPrint Geometry



Body SurfaceOrSolidModel Geometry

The Body SurfaceOrSolidModel Geometry concept applies to this entity.

Any IfcElement (so far no further constraints are defined at the level of its subtypes) may be represented as a mixed representation, including surface and solid models.



Body SurfaceModel Geometry

The Body SurfaceModel Geometry concept applies to this entity.

Any IfcElement (so far no further constraints are defined at the level of its subtypes) may be represented as a single or multiple surface models, based on either shell or face based surface models. It may also include tessellated models.

 

surface model
EXAMPLE  As shown in Figure 154, the surface model representation is given by an IfcShapeRepresentation, which includes a single item which is either an IfcShellBasedSurfaceModel, or an IfcFaceBasedSurfaceModel. In some cases it may also be useful to expose a simple representation as a bounding box representation of the same complex shape.

Figure 154 — Element surface model representation

 


Body Tessellation Geometry

The Body Tessellation Geometry concept applies to this entity.

Any IfcElement (so far no further constraints are defined at the level of its subtypes) may be represented as a single or multiple tessellated surface models, in particular triangulated surface models.



Body Brep Geometry

The Body Brep Geometry concept applies to this entity.

Any IfcElement (so far no further constraints are defined at the level of its subtypes) may be represented as a single or multiple Boundary Representation models (which are restricted to be faceted Brep's with or without voids). The Brep representation allows for the representation of complex element shape.

 

Brep representation
EXAMPLE  As shown in Figure 155, the Brep representation is given by an IfcShapeRepresentation, which includes one or more items, all of type IfcFacetedBrep. In some cases it may be useful to also expose a simple representation as a bounding box representation of the same complex shape.

Figure 155 — Building element body boundary representation

 


Body AdvancedBrep Geometry

The Body AdvancedBrep Geometry concept applies to this entity.

An IfcElement (so far no further constraints are defined at the level of its subtypes or by view definitions) may be represented as a single or multiple boundary representation models, which include advanced surfaces, usually refered to as NURBS surfaces. The 'AdvancedBrep' representation allows for the representation of complex free-form element shape.

NOTE  View definitions or implementer agreements may restrict or disallow the use of 'AdvancedBrep' geometry.


Body CSG Geometry

The Body CSG Geometry concept applies to this entity.

Any IfcElement (so far no further constraints are defined at the level of its subtypes) may be represented a CSG primitive or CSG tree. The CSG representation allows for the representation of complex element shape.

NOTE  View definitions or implementer agreements may restrict or disallow the use of 'CSG' geometry.


Mapped Geometry

The Mapped Geometry concept applies to this entity.

Any IfcElement (so far no further constraints are defined at the level of its subtypes) may be represented using the 'MappedRepresentation'. This shall be supported as it allows for reusing the geometry definition of a type at all occurrences of the same type. The results are more compact data sets.

The same constraints, as given for 'SurfaceOrSolidModel', 'SurfaceModel', 'Tessellation', 'Brep', and 'AdvancedBrep' geometric representation, shall apply to the IfcRepresentationMap.



Element Voiding

The Element Voiding concept applies to this entity.



Element Projecting

The Element Projecting concept applies to this entity.



Linear Placement

The Product Linear Placement concept template applies to this entity as shown in Table 54.

LinearPositioninElementDescription
IfcLinearPositioningElementDIstance can be measured along any physical element that has a representation featuring an IfcBoundedCurve that can be used as an Axis in IfcLinearPositioningElement.

Table 54 — IfcElement Product Linear Placement



mvdXML Specification
<?xml version="1.0"?>
<ConceptRoot xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" uuid="45c13cd8-1b20-4895-b084-2fca09b68a2a" name="IfcElement" status="sample" applicableRootEntity="IfcElement">
  <Applicability uuid="00000000-0000-0000-0000-000000000000" status="sample">
    <Template ref="f44ee7f3-f22f-4e10-918d-d01d83d3071b" />
    <TemplateRules operator="and" />
  </Applicability>
  <Concepts>
    <Concept uuid="c174c84e-5ba2-4a4f-86b7-565c0626b272" name="Property Sets for Objects" status="sample" override="false">
      <Template ref="f74255a6-0c0e-4f31-84ad-24981db62461" />
      <TemplateRules operator="and">
        <TemplateRule Parameters="PsetName[Value]='Pset_EnvironmentalImpactIndicators'" />
        <TemplateRule Parameters="PsetName[Value]='Pset_EnvironmentalImpactValues'" />
        <TemplateRule Parameters="PsetName[Value]='Pset_Condition'" />
        <TemplateRule Parameters="PsetName[Value]='Pset_ManufacturerOccurrence'" />
        <TemplateRule Parameters="PsetName[Value]='Pset_ManufacturerTypeInformation'" />
        <TemplateRule Parameters="PsetName[Value]='Pset_ServiceLife'" />
        <TemplateRule Parameters="PsetName[Value]='Pset_Warranty'" />
      </TemplateRules>
    </Concept>
    <Concept uuid="1cf74898-9f79-4a9e-a0d9-019c11088c3e" name="Product Local Placement" status="sample" override="false">
      <Template ref="cbe85b5f-7912-4a43-8bb7-1e63bf40b26d" />
      <TemplateRules operator="and">
        <TemplateRule Description="Relative placement according to position and rotation relative to container." Parameters="HasPlacement[Type]='IfcLocalPlacement'" />
        <TemplateRule Description="Absolute placement according to position and rotation of world coordinate system." Parameters="HasPlacement[Type]='IfcLocalPlacement'" />
      </TemplateRules>
    </Concept>
    <Concept uuid="5d59ea3a-d1b2-4966-92b2-b6ad32b9cc07" name="CoG Geometry" status="sample" override="false">
      <Template ref="a13f0eca-6c45-4a95-bfa6-03cc7da6a6cf" />
    </Concept>
    <Concept uuid="4f15de20-1150-41bf-af4d-998047663946" name="Box Geometry" status="sample" override="false">
      <Template ref="b942ceb1-b818-4683-871b-9c979fa34dd5" />
    </Concept>
    <Concept uuid="4336ad71-e1b5-4b3c-bda4-85b0fa2f003c" name="FootPrint Geometry" status="sample" override="false">
      <Template ref="4f5777d7-68e9-459c-aa2c-46adf3e88d31" />
      <TemplateRules operator="and">
        <TemplateRule Description="Any collection of points and curves representing the floor plan projection." Parameters="Identifier[Value]='FootPrint' AND Type[Value]='GeometricCurveSet'" />
        <TemplateRule Description="Any collection of points and curves, and additional hatching and text representing the floor plan projection." Parameters="Identifier[Value]='FootPrint' AND Type[Value]='Annotation2D'" />
      </TemplateRules>
    </Concept>
    <Concept uuid="6774bf6a-01a8-49db-b300-7a90c0ffc9af" name="Body SurfaceOrSolidModel Geometry" status="sample" override="false">
      <Template ref="fbbb70d8-52ee-4d90-972e-9ddb4c0a11ab" />
    </Concept>
    <Concept uuid="4efb9ee0-81a6-48d6-96cc-a9521f03dfd6" name="Body SurfaceModel Geometry" status="sample" override="false">
      <Template ref="17d34a12-9403-40f4-bf82-65399be23c55" />
    </Concept>
    <Concept uuid="1dfabbd4-7bad-45d4-9a80-76a3119b3abf" name="Body Tessellation Geometry" status="sample" override="false">
      <Template ref="5cfd4403-6545-4c6d-bc27-0a95a3d09950" />
    </Concept>
    <Concept uuid="a43f9fe1-d853-4f66-856e-b39c8ce0577f" name="Body Brep Geometry" status="sample" override="false">
      <Template ref="8fb923f5-b82d-48d2-ad29-d678ca473fda" />
    </Concept>
    <Concept uuid="9d50ed78-ea94-47c5-bce5-e5fb4682c713" name="Body AdvancedBrep Geometry" status="sample" override="false">
      <Template ref="fc763575-50f1-4bc0-bbf2-382380152047" />
    </Concept>
    <Concept uuid="698a7b75-fc38-4233-8afa-5471591a57b9" name="Body CSG Geometry" status="sample" override="false">
      <Template ref="a0ab7630-6965-495e-be8f-d106fd2599c2" />
    </Concept>
    <Concept uuid="7e839abe-0d85-4c0e-a6b9-feb79842c4fb" name="Mapped Geometry" status="sample" override="false">
      <Template ref="ecfdd7c8-71d5-449f-bf20-e63a25dcb9ba" />
    </Concept>
    <Concept uuid="cd4e7615-a33c-405b-861c-d983b8e7b6c8" name="Element Voiding" status="sample" override="false">
      <Template ref="b9005e79-b5c5-4c0b-9d86-046c21ad420d" />
    </Concept>
    <Concept uuid="0ac5e600-3b9a-4fe1-b028-9cd4d6d44f0e" name="Element Projecting" status="sample" override="false">
      <Template ref="14891e19-2eaa-4641-8913-629bb9a60801" />
    </Concept>
    <Concept uuid="e8eec15a-5c2e-4bad-9767-f157690cd5a3" name="Linear Placement" status="sample" override="false">
      <Template ref="8b71ce7c-35cf-4aaf-9402-f060c8c57bf3" />
      <TemplateRules operator="and">
        <TemplateRule Description="DIstance can be measured along any physical element that has a representation featuring an IfcBoundedCurve that can be used as an Axis in IfcLinearPositioningElement." Parameters="LinearPositioninElement[Type]='IfcLinearPositioningElement'" />
      </TemplateRules>
    </Concept>
  </Concepts>
</ConceptRoot>
Concept inheritance

#ConceptTemplateModel View
IfcRoot
IdentitySoftware IdentityGeneral Usage
Revision ControlRevision ControlGeneral Usage
IfcObjectDefinition
Classification AssociationClassification AssociationGeneral Usage
IfcObject
Object User IdentityObject User IdentityGeneral Usage
Object Predefined TypeObject Predefined TypeGeneral Usage
Object TypingObject TypingGeneral Usage
Property Sets with OverrideProperty Sets with OverrideGeneral Usage
IfcProduct
Product PlacementProduct PlacementGeneral Usage
Product Geometric RepresentationProduct Geometric RepresentationGeneral Usage
IfcElement
Property Sets for ObjectsProperty Sets for ObjectsGeneral Usage
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
Element VoidingElement VoidingGeneral Usage
Element ProjectingElement ProjectingGeneral Usage
Linear PlacementProduct Linear PlacementGeneral Usage
Formal representations
XML Specification
 <xs:element name="IfcElement" type="ifc:IfcElement" abstract="true" substitutionGroup="ifc:IfcProduct" nillable="true"/>
 <xs:complexType name="IfcElement" abstract="true">
  <xs:complexContent>
   <xs:extension base="ifc:IfcProduct">
    <xs:sequence>
     <xs:element name="HasProjections" nillable="true" minOccurs="0">
      <xs:complexType>
       <xs:sequence>
        <xs:element ref="ifc:IfcRelProjectsElement" minOccurs="0" maxOccurs="unbounded"/>
       </xs:sequence>
       <xs:attribute ref="ifc:itemType" fixed="ifc:IfcRelProjectsElement"/>
       <xs:attribute ref="ifc:cType" fixed="set"/>
       <xs:attribute ref="ifc:arraySize" use="optional"/>
      </xs:complexType>
     </xs:element>
     <xs:element name="HasOpenings" nillable="true" minOccurs="0">
      <xs:complexType>
       <xs:sequence>
        <xs:element ref="ifc:IfcRelVoidsElement" minOccurs="0" maxOccurs="unbounded"/>
       </xs:sequence>
       <xs:attribute ref="ifc:itemType" fixed="ifc:IfcRelVoidsElement"/>
       <xs:attribute ref="ifc:cType" fixed="set"/>
       <xs:attribute ref="ifc:arraySize" use="optional"/>
      </xs:complexType>
     </xs:element>
     <xs:element name="HasCoverings" nillable="true" minOccurs="0">
      <xs:complexType>
       <xs:sequence>
        <xs:element ref="ifc:IfcRelCoversBldgElements" minOccurs="0" maxOccurs="unbounded"/>
       </xs:sequence>
       <xs:attribute ref="ifc:itemType" fixed="ifc:IfcRelCoversBldgElements"/>
       <xs:attribute ref="ifc:cType" fixed="set"/>
       <xs:attribute ref="ifc:arraySize" use="optional"/>
      </xs:complexType>
     </xs:element>
    </xs:sequence>
    <xs:attribute name="Tag" type="ifc:IfcIdentifier" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcElement
 ABSTRACT SUPERTYPE OF(ONEOF(IfcBuildingElement, IfcCivilElement, IfcDistributionElement, IfcElementAssembly, IfcElementComponent, IfcFeatureElement, IfcFurnishingElement, IfcGeographicElement, IfcTransportElement, IfcVirtualElement))
 SUBTYPE OF (IfcProduct);
  Tag : OPTIONAL IfcIdentifier;
 INVERSE
  FillsVoids : SET [0:1] OF IfcRelFillsElement FOR RelatedBuildingElement;
  ConnectedTo : SET [0:?] OF IfcRelConnectsElements FOR RelatingElement;
  IsInterferedByElements : SET [0:?] OF IfcRelInterferesElements FOR RelatedElement;
  InterferesElements : SET [0:?] OF IfcRelInterferesElements FOR RelatingElement;
  HasProjections : SET [0:?] OF IfcRelProjectsElement FOR RelatingElement;
  ReferencedInStructures : SET [0:?] OF IfcRelReferencedInSpatialStructure FOR RelatedElements;
  HasOpenings : SET [0:?] OF IfcRelVoidsElement FOR RelatingBuildingElement;
  IsConnectionRealization : SET [0:?] OF IfcRelConnectsWithRealizingElements FOR RealizingElements;
  ProvidesBoundaries : SET [0:?] OF IfcRelSpaceBoundary FOR RelatedBuildingElement;
  ConnectedFrom : SET [0:?] OF IfcRelConnectsElements FOR RelatedElement;
  ContainedInStructure : SET [0:1] OF IfcRelContainedInSpatialStructure FOR RelatedElements;
  HasCoverings : SET [0:?] OF IfcRelCoversBldgElements FOR RelatingBuildingElement;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcRelConnectsElements IfcRelConnectsPorts IfcRelConnectsWithRealizingElements IfcRelFillsElement IfcRelInterferesElements IfcRelProjectsElement IfcRelSpaceBoundary IfcRelVoidsElement IfcRelCoversBldgElements IfcStructuralActivityAssignmentSelect

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