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 R
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.
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
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
Inherited definitions from supertypes
Entity inheritance IfcBuildingElement IfcCivilElement IfcDistributionElement IfcElementAssembly IfcElementComponent IfcFeatureElement IfcFurnishingElement IfcGeographicElement IfcTransportElement IfcProduct IfcObject IfcObjectDefinition IfcRoot
Attribute inheritance
#AttributeTypeCardinalityDescriptionR
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.
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.
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
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
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.
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
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
Definitions applying to Reference View

 Instance diagram


All general-case subtypes of IfcElement are included in this model view; standard-case and elemented-case subtypes are excluded.

Concept usage

Property Sets for Objects

The Property Sets for Objects concept template applies to this entity as shown in Table 18.

PsetNameProperties
Pset_EnvironmentalImpactIndicators
TemplatePropertyNameValueReference
Single ValueReferenceIfcIdentifier
Single ValueFunctionalUnitReferenceIfcLabel
Single ValueUnitIfcText
Enumerated ValueLifeCyclePhaseIfcLabelPEnum_LifeCyclePhase
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
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 ValueLeadOutTimeIfcDuration
Pset_Condition
TemplatePropertyNameValue
Single ValueAssessmentDateIfcDate
Single ValueAssessmentConditionIfcLabel
Single ValueAssessmentDescriptionIfcText
Pset_ManufacturerOccurrence
TemplatePropertyNameValueReference
Single ValueAcquisitionDateIfcDate
Single ValueBarCodeIfcIdentifier
Single ValueSerialNumberIfcIdentifier
Single ValueBatchReferenceIfcIdentifier
Enumerated ValueAssemblyPlaceIfcLabelPEnum_AssemblyPlace
Pset_ManufacturerTypeInformation
TemplatePropertyNameValueReference
Single ValueGlobalTradeItemNumberIfcIdentifier
Single ValueArticleNumberIfcIdentifier
Single ValueModelReferenceIfcLabel
Single ValueModelLabelIfcLabel
Single ValueManufacturerIfcLabel
Single ValueProductionYearIfcLabel
Enumerated ValueAssemblyPlaceIfcLabelPEnum_AssemblyPlace
Pset_ServiceLife
TemplatePropertyNameValueUpperValueLowerValueSetValue
Bounded ValueServiceLifeDurationIfcDuration
Single ValueMeanTimeBetweenFailureIfcDuration
Pset_Warranty
TemplatePropertyNameValue
Single ValueWarrantyIdentifierIfcIdentifier
Single ValueWarrantyStartDateIfcDate
Single ValueWarrantyEndDateIfcDate
Single ValueIsExtendedWarrantyIfcBoolean
Single ValueWarrantyPeriodIfcDuration
Single ValueWarrantyContentIfcText
Single ValuePointOfContactIfcLabel
Single ValueExclusionsIfcText

Table 18 — IfcElement Property Sets for Objects



Product Local Placement

The Product Local Placement concept template applies to this entity as shown in Table 19.

HasPlacementRelativeToElementDescription
IfcLocalPlacementIfcSpatialElementPlacement relative to the position and rotation of the spatial element.
IfcLocalPlacementIfcElementPlacement relative to the position and rotation of the container element.

Table 19 — IfcElement Product Local Placement

Placement of elements is defined by a local placement (a transformation matrix relative to):

The local placement shall always be relative.



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 111, the bounding box representation is given by an IfcShapeRepresentation that includes a single item, an IfcBoundingBox.

Figure 111 — Building element box representation

 


Body Solid Geometry General

The Body Geometry General concept applies to this entity.



Body Tessellation Geometry

The Body Tessellation Geometry concept applies to this entity.

The default geometric representation of any IfcElement within this model view is a single or multiple tessellated item. The supported tessellation is a triangulated face set, defined by indices into a Cartesian point list. Optionally normals per vertex can be included as well.



Body SweptSolid PolyCurve Geometry

The Body SweptSolid PolyCurve Geometry concept applies to this entity.

The IfcElement can be geometrically represented by a single or multiple swept solid. In this case, both extruded and revolved solids are supported. The cross section of the swept solid is provided by a poly curve, having straight and circular arc segments. The cross section may have inner loops that result in holes of the resulting swept solid.



Mapped Geometry

The Mapped Geometry concept template applies to this entity as shown in Table 20.

IdentifierType
SurfaceMappedItem
BodyMappedItem

Table 20 — IfcElement Mapped Geometry

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 'Tessellation', 'SweptSolid', and 'AdvancedSweptSolid' geometric representation, shall apply to the IfcRepresentationMap.



Product Geometry Layer

The Product Geometry Layer concept applies to this entity.



Product Geometry Colour

The Product Geometry Colour concept applies to this entity.



Spatial Containment

The Spatial Containment concept applies to this entity.



Element Composition

The Element Composition concept applies to this entity.



Element Decomposition

The Element Decomposition concept applies to this entity.



Element Voiding

The Element Voiding concept applies to this entity.



Material Single

The Material Single for Objects with Override concept template applies to this entity as shown in Table 21.

MaterialPropertySetName
Pset_MaterialCommon
Pset_MaterialCombustion
Pset_MaterialConcrete
Pset_MaterialEnergy
Pset_MaterialFuel
Pset_MaterialHygroscopic
Pset_MaterialMechanical
Pset_MaterialOptical
Pset_MaterialSteel
Pset_MaterialThermal
Pset_MaterialWater
Pset_MaterialWood
Pset_MaterialWoodBasedBeam
Pset_MaterialWoodBasedPanel

Table 21 — IfcElement Material Single for Objects with Override



Material Constituent

The Material Constituent Set with Override concept applies to this entity.



Classification

The Classification for Objects with Override concept applies to this entity.



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="c58866fd-312a-4ed8-8569-b11a0f694634" name="IfcElement" status="sample" applicableRootEntity="IfcElement">
  <Applicability uuid="00000000-0000-0000-0000-000000000000" status="sample">
    <Template ref="826680f1-b756-4cdf-b424-20b60228e143" />
    <TemplateRules operator="and" />
  </Applicability>
  <Concepts>
    <Concept uuid="ab8a65fa-3066-412f-8347-a023abc3f817" name="Property Sets for Objects" status="sample" override="false">
      <Template ref="f74255a6-0c0e-4f31-84ad-24981db62461" />
      <Requirements>
        <Requirement applicability="export" requirement="recommended" exchangeRequirement="dcd96125-898e-4ff0-b294-eb02afe953aa" />
        <Requirement applicability="import" requirement="recommended" exchangeRequirement="dcd96125-898e-4ff0-b294-eb02afe953aa" />
      </Requirements>
      <TemplateRules operator="and">
        <TemplateRule Parameters="PsetName=Pset_EnvironmentalImpactIndicators;" />
        <TemplateRule Parameters="PsetName=Pset_EnvironmentalImpactValues;" />
        <TemplateRule Parameters="PsetName=Pset_Condition;" />
        <TemplateRule Parameters="PsetName=Pset_ManufacturerOccurrence;" />
        <TemplateRule Parameters="PsetName=Pset_ManufacturerTypeInformation;" />
        <TemplateRule Parameters="PsetName=Pset_ServiceLife;" />
        <TemplateRule Parameters="PsetName=Pset_Warranty;" />
      </TemplateRules>
    </Concept>
    <Concept uuid="1c47ba50-9354-434d-a9ac-1d7c05a290e3" name="Product Local Placement" status="sample" override="false">
      <Template ref="cbe85b5f-7912-4a43-8bb7-1e63bf40b26d" />
      <Requirements>
        <Requirement applicability="export" requirement="recommended" exchangeRequirement="dcd96125-898e-4ff0-b294-eb02afe953aa" />
        <Requirement applicability="import" requirement="recommended" exchangeRequirement="dcd96125-898e-4ff0-b294-eb02afe953aa" />
      </Requirements>
      <TemplateRules operator="and">
        <TemplateRule Description="Placement relative to the position and rotation of the spatial element." Parameters="HasPlacement=IfcLocalPlacement;RelativeToElement=IfcSpatialElement;" />
        <TemplateRule Description="Placement relative to the position and rotation of the container element." Parameters="HasPlacement=IfcLocalPlacement;RelativeToElement=IfcElement;" />
      </TemplateRules>
    </Concept>
    <Concept uuid="134dc8e5-a89d-4d54-ac5d-6ba27d2c5a60" name="CoG Geometry" status="sample" override="false">
      <Template ref="a13f0eca-6c45-4a95-bfa6-03cc7da6a6cf" />
    </Concept>
    <Concept uuid="16b0d3f0-2982-4224-ab5b-04288ac8d58b" name="Box Geometry" status="sample" override="false">
      <Template ref="b942ceb1-b818-4683-871b-9c979fa34dd5" />
    </Concept>
    <Concept uuid="0d974712-679c-43e1-b278-326e680d2fe8" name="Body Solid Geometry General" status="sample" override="false">
      <Template ref="6656c33f-2ce2-43de-89d6-a7ee1262b1a0" />
    </Concept>
    <Concept uuid="ce779b85-4fbf-46dc-bcf0-ee657eccd537" name="Body Tessellation Geometry" status="sample" override="false">
      <Template ref="5cfd4403-6545-4c6d-bc27-0a95a3d09950" />
    </Concept>
    <Concept uuid="522f2b24-b397-458a-9c5c-be641cc2071a" name="Body SweptSolid PolyCurve Geometry" status="sample" override="false">
      <Template ref="38710ccd-8ff5-41ba-8fda-08300907a02e" />
    </Concept>
    <Concept uuid="eec431fa-85e7-46a4-b858-31edf9abfb62" name="Mapped Geometry" status="sample" override="false">
      <Template ref="ecfdd7c8-71d5-449f-bf20-e63a25dcb9ba" />
      <Requirements>
        <Requirement applicability="export" requirement="recommended" exchangeRequirement="dcd96125-898e-4ff0-b294-eb02afe953aa" />
        <Requirement applicability="import" requirement="recommended" exchangeRequirement="dcd96125-898e-4ff0-b294-eb02afe953aa" />
      </Requirements>
      <TemplateRules operator="and">
        <TemplateRule Parameters="Identifier=Surface;Type=MappedItem;" />
        <TemplateRule Parameters="Identifier=Body;Type=MappedItem;" />
      </TemplateRules>
    </Concept>
    <Concept uuid="2a658ec4-ebaa-4967-82b2-45a2bb75b2ea" name="Product Geometry Layer" status="sample" override="false">
      <Template ref="79a0d5e1-02ae-41d1-a51d-49a22c5b0a14" />
    </Concept>
    <Concept uuid="8e814a1e-6188-4bb0-9bcf-07d8147206b4" name="Product Geometry Colour" status="sample" override="false">
      <Template ref="bb040be6-824a-4e78-9814-1177b257fdc9" />
    </Concept>
    <Concept uuid="648282d7-f66b-43dc-9c2d-2ca98f6773d8" name="Spatial Containment" status="sample" override="false">
      <Template ref="d9a3f822-0014-4bc2-8d94-9d9067759045" />
    </Concept>
    <Concept uuid="1bc4288f-24ad-4398-802e-bc935868ed27" name="Element Composition" status="sample" override="false">
      <Template ref="ca0f65e2-3913-4fdb-8a09-0c5c7a0d5421" />
    </Concept>
    <Concept uuid="21563473-16d3-471a-a3b1-881221b2554e" name="Element Decomposition" status="sample" override="false">
      <Template ref="8a27c15a-c4ea-4ca9-8cce-7fbba1c9bce0" />
      <Requirements>
        <Requirement applicability="import" requirement="recommended" exchangeRequirement="dcd96125-898e-4ff0-b294-eb02afe953aa" />
        <Requirement applicability="export" requirement="recommended" exchangeRequirement="dcd96125-898e-4ff0-b294-eb02afe953aa" />
      </Requirements>
    </Concept>
    <Concept uuid="f5a4c7d3-f844-473f-8d8d-8591607d5f99" name="Element Voiding" status="sample" override="false">
      <Template ref="b9005e79-b5c5-4c0b-9d86-046c21ad420d" />
      <Requirements>
        <Requirement applicability="export" requirement="recommended" exchangeRequirement="dcd96125-898e-4ff0-b294-eb02afe953aa" />
        <Requirement applicability="import" requirement="recommended" exchangeRequirement="dcd96125-898e-4ff0-b294-eb02afe953aa" />
      </Requirements>
    </Concept>
    <Concept uuid="139cc6a8-6b1f-4b75-8104-15fc2f740af3" name="Material Single" status="sample" override="false">
      <Template ref="ce228dc3-1168-4ee5-8cde-ae7874b03000" />
      <TemplateRules operator="and">
        <TemplateRule Parameters="MaterialPropertySetName=Pset_MaterialCommon;" />
        <TemplateRule Parameters="MaterialPropertySetName=Pset_MaterialCombustion;" />
        <TemplateRule Parameters="MaterialPropertySetName=Pset_MaterialConcrete;" />
        <TemplateRule Parameters="MaterialPropertySetName=Pset_MaterialEnergy;" />
        <TemplateRule Parameters="MaterialPropertySetName=Pset_MaterialFuel;" />
        <TemplateRule Parameters="MaterialPropertySetName=Pset_MaterialHygroscopic;" />
        <TemplateRule Parameters="MaterialPropertySetName=Pset_MaterialMechanical;" />
        <TemplateRule Parameters="MaterialPropertySetName=Pset_MaterialOptical;" />
        <TemplateRule Parameters="MaterialPropertySetName=Pset_MaterialSteel;" />
        <TemplateRule Parameters="MaterialPropertySetName=Pset_MaterialThermal;" />
        <TemplateRule Parameters="MaterialPropertySetName=Pset_MaterialWater;" />
        <TemplateRule Parameters="MaterialPropertySetName=Pset_MaterialWood;" />
        <TemplateRule Parameters="MaterialPropertySetName=Pset_MaterialWoodBasedBeam;" />
        <TemplateRule Parameters="MaterialPropertySetName=Pset_MaterialWoodBasedPanel;" />
      </TemplateRules>
    </Concept>
    <Concept uuid="8f4f1803-f293-48ef-a50b-899176307cf4" name="Material Constituent" status="sample" override="false">
      <Template ref="b31e8fb4-e7b9-48da-bbf4-cfd422f5f6cd" />
    </Concept>
    <Concept uuid="37f15abd-df8c-4af1-90a9-e2ce3d5eb0f4" name="Classification" status="sample" override="false">
      <Template ref="2a56ad37-c686-401e-a4e0-61b428927798" />
    </Concept>
  </Concepts>
</ConceptRoot>
Concept inheritance

#ConceptTemplateModel View
IfcRoot
IdentitySoftware IdentityReference View
Revision ControlRevision ControlReference View
IfcObjectDefinition
ClassificationClassificationReference View
IfcObject
Object User IdentityObject User IdentityReference View
Object Predefined TypeObject Predefined TypeReference View
Object TypingObject TypingReference View
Property Sets for ObjectsProperty Sets with OverrideReference View
IfcElement
Property Sets for ObjectsProperty Sets for ObjectsReference View
Product Local PlacementProduct Local PlacementReference View
CoG GeometryCoG GeometryReference View
Box GeometryBox GeometryReference View
Body Solid Geometry GeneralBody Geometry GeneralReference View
Body Tessellation GeometryBody Tessellation GeometryReference View
Body SweptSolid PolyCurve GeometryBody SweptSolid PolyCurve GeometryReference View
Mapped GeometryMapped GeometryReference View
Product Geometry LayerProduct Geometry LayerReference View
Product Geometry ColourProduct Geometry ColourReference View
Spatial ContainmentSpatial ContainmentReference View
Element CompositionElement CompositionReference View
Element DecompositionElement DecompositionReference View
Element VoidingElement VoidingReference View
Material SingleMaterial Single for Objects with OverrideReference View
Material ConstituentMaterial Constituent Set with OverrideReference View
ClassificationClassification for Objects with OverrideReference View
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="HasOpenings" type="ifc:IfcRelVoidsElement" nillable="true" minOccurs="0" maxOccurs="1"/>
    </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))
 SUBTYPE OF (IfcProduct);
  Tag : OPTIONAL IfcIdentifier;
 INVERSE
  FillsVoids : SET [0:1] OF IfcRelFillsElement FOR RelatedBuildingElement;
  HasOpenings : SET [0:?] OF IfcRelVoidsElement FOR RelatingBuildingElement;
  ContainedInStructure : SET [0:1] OF IfcRelContainedInSpatialStructure FOR RelatedElements;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcRelConnectsPorts IfcRelFillsElement IfcRelVoidsElement

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