5.4.3.4 IfcElement
| Élément |
| Element (allgemein) |
An element is a generalization of all components
that make up an AEC product. Those 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.
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.
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
Quantity Use Definition
The quantities relating to the IfcElement are defined
by the IfcElementQuantity and attached by the
IfcRelDefinesByProperties. A detailed specification for
individual quantities is introduced at the level of subtypes of
IfcElement.
Geometry Use Definitions
The geometric representation of any IfcElement is given
by the IfcProductDefinitionShape and
IfcLocalPlacement allowing multiple geometric
representations. A detailed specification for the local placement
and shape representaion is introduced at the level of subtypes of
IfcElement.
Construction Operations
An element represents a physical building component. All subtypes of IfcElement are within scope of this MVD (for example, IfcBoiler), however instantiable subtypes are not incorporated within this documentation, for brevity.
Instance diagram
Identity
The Identity concept applies to this entity.
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Revision Control
The Revision Control concept applies to this entity.
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External Data Constraints
The External Data Constraints concept applies to this entity as shown in Table 19.
| Table | Name | Reference | Format | Color |
|---|
| Component | Name | IfcElement.Name | Key | #FFFF99 |
| Component | CreatedBy | IfcElement.OwnerHistory\IfcOwnerHistory.OwningUser\IfcPersonAndOrganization.ThePerson\IfcPerson.Identification | | #FFCC99 |
| Component | CreatedOn | IfcElement.OwnerHistory\IfcOwnerHistory.CreationDate | | #FFFF99 |
| Component | TypeName | IfcElement.IsTypedBy[*]\IfcRelDefinesByType.RelatingType | | #FFCC99 |
| Component | Space | IfcElement.ContainedInStructure[*]\IfcRelContainedInSpatialStructure.RelatingStructure | | #FFCC99 |
| Component | Description | IfcElement.Description | | #FFFF99 |
| Component | ExtSystem | IfcElement.OwnerHistory\IfcOwnerHistory.OwningApplication\IfcApplication.ApplicationIdentifier | | #CC99FF |
| Component | ExtObject | IfcElement\ | | #CC99FF |
| Component | ExtIdentifier | IfcElement.GlobalId | | #CC99FF |
| Component | SerialNumber | IfcElement.IsDefinedBy['Pset_ManufacturerOccurrence']\IfcRelDefinesByProperties.RelatingPropertyDefinition\IfcPropertySet.HasProperties['SerialNumber']\IfcPropertySingleValue.NominalValue\IfcIdentifier | | #CCFFCC |
| Component | InstallationDate | IfcElement.IsDefinedBy['Pset_ManufacturerOccurrence']\IfcRelDefinesByProperties.RelatingPropertyDefinition\IfcPropertySet.HasProperties['AcquisitionDate']\IfcPropertySingleValue.NominalValue\IfcDateTime | | #CCFFCC |
| Component | WarrantyStartDate | IfcElement.IsDefinedBy['Pset_Warranty']\IfcRelDefinesByProperties.RelatingPropertyDefinition\IfcPropertySet.HasProperties['WarrantyStartDate']\IfcPropertySingleValue.NominalValue\IfcDateTime | | #CCFFCC |
| Component | TagNumber | IfcElement.Tag | | #CCFFCC |
| Component | BarCode | IfcElement.IsDefinedBy['Pset_ManufacturerOccurrence']\IfcRelDefinesByProperties.RelatingPropertyDefinition\IfcPropertySet.HasProperties['BarCode']\IfcPropertySingleValue.NominalValue\IfcIdentifier | | #CCFFCC |
| Component | AssetIdentifier | IfcElement.IsDefinedBy['Pset_ManufacturerOccurrence']\IfcRelDefinesByProperties.RelatingPropertyDefinition\IfcPropertySet.HasProperties['BatchReference']\IfcPropertySingleValue.NominalValue\IfcIdentifier | | #CCFFCC |
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Table 19 — IfcElement External Data Constraints |
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Classification
The Classification concept applies to this entity as shown in Table 20.
| Source | Name | Tokens | Description |
|---|
| Construction Specifications Institute | OmniClass Table 22 | 22-00 00 00 | Work Results |
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Table 20 — IfcElement Classification |
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Object Typing
The Object Typing concept applies to this entity as shown in Table 21.
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Table 21 — IfcElement Object Typing |
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Spatial Containment
The Spatial Containment concept applies to this entity as shown in Table 22.
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Table 22 — IfcElement Spatial Containment |
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Properties for Occurrences
The Properties for Occurrences concept applies to this entity as shown in Table 23.
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Table 23 — IfcElement Properties for Occurrences |
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XSD 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:complexContent>
</xs:complexType>
EXPRESS Specification:
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| Tag | : | OPTIONAL IfcStrippedOptional; |
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Attribute Definitions:
| Tag | : | 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. |
| ConnectedTo | : | Reference to the element connection relationship. The relationship then refers to the other element to which this element is connected to.
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| IsConnectionRealization | : |
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.
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| ConnectedFrom | : | Reference to the element connection relationship. The relationship then refers to the other element that is connected to this element.
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| ContainedInStructure | : |
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.
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Inheritance Graph:
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| ObjectType | : | OPTIONAL IfcStrippedOptional; |
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| ObjectPlacement | : | OPTIONAL IfcStrippedOptional; |
| Representation | : | OPTIONAL IfcStrippedOptional; |
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| Tag | : | OPTIONAL IfcStrippedOptional; |
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