Shading devices are purpose built devices to protect from the sunlight, from natural light, or screening them from view. Shading devices can form part of the facade or can be mounted inside the building, they can be fixed or operable.
NOTE Also other building elements such as
protruding slabs or balconies can act as shading devices. Those
elements however have another primary purpose and are defined as
IfcSlab or by other subtypes of IfcBuildingElement.
The particular additional purpose as a shading device is provided
by assigning the property set Pset_ElementShading to those
HISTORY New entity in IFC4
Common Use Definitions
The following concepts are inherited at supertypes:
- IfcRoot: Identity, Revision Control
- IfcElement: Product Placement, Box Geometry, FootPrint Geometry, Body SurfaceOrSolidModel Geometry, Body SurfaceModel Geometry, Body Tessellation Geometry, Body Brep Geometry, Body AdvancedBrep Geometry, Body CSG Geometry, Mapped Geometry
- IfcBuildingElement: Product Assignment, Surface 3D Geometry
The Object Typing concept applies to this entity as shown in Table 161.
Table 161 — IfcShadingDevice Object Typing
Property Sets for Objects
The Property Sets for Objects concept applies to this entity as shown in Table 162.
Table 162 — IfcShadingDevice Property Sets for Objects
The Material Single concept applies to this entity.
The Spatial Containment concept applies to this entity as shown in Table 163.
|IfcBuildingStorey||Default spatial container|
|IfcBuilding||Spatial container for the element if it cannot be assigned to a building storey|
|IfcSite||Spatial container for the element in case that it is placed on site (outside of building)|
|IfcSpace||In particular use cases, a shading device maybe assigned directly to space|
Table 163 — IfcShadingDevice Spatial Containment
The IfcShadingDevice, as any subtype of IfcBuildingElement,
may participate alternatively in one of the two different containment relationships:
- the Spatial Containment (defined here), or
- the Element Composition.
XSD Specification: <xs:element name="IfcShadingDevice" type="ifc:IfcShadingDevice" substitutionGroup="ifc:IfcBuildingElement" nillable="true"/>
<xs:attribute name="PredefinedType" type="ifc:IfcShadingDeviceTypeEnum" use="optional"/>
|CorrectPredefinedType|| : ||NOT(EXISTS(PredefinedType)) OR
(PredefinedType <> IfcShadingDeviceTypeEnum.USERDEFINED) OR
((PredefinedType = IfcShadingDeviceTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));|
|CorrectTypeAssigned|| : ||(SIZEOF(IsTypedBy) = 0) OR
('IFCSHAREDBLDGELEMENTS.IFCSHADINGDEVICETYPE' IN TYPEOF(SELF\IfcObject.IsTypedBy.RelatingType));|
|PredefinedType|| : ||
Predefined generic type for a shading device that is specified in an enumeration. There may be a property set given specificly for the predefined types.
NOTE The PredefinedType shall only be used, if no IfcShadingDeviceType is assigned, providing its own IfcShadingDeviceType.PredefinedType.
|CorrectPredefinedType|| : ||
Either the PredefinedType attribute is unset (e.g. because an IfcShadingDeviceType is associated), or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED.
|CorrectTypeAssigned|| : ||
Either there is no shading device type object associated, i.e. the IsTypedBy inverse relationship is not provided, or the associated type object has to be of type IfcShadingDeviceType.
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