IfcPermeableCoveringProperties

BACnet MVD

#### IfcPermeableCoveringProperties

Natural language names

| Festdefinierte Merkmale einer luftdurchlässigen Abdeckung
| Permeable Covering Properties

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcPermeableCoveringProperties |  |  |  |
OwnerHistory |  |  | MODIFIED | Instantiation changed to OPTIONAL.

##### Semantic definitions at the entity

Entity definition

This entity is a description of a panel within a door or window (as fillers for opening) which allows for air flow. It is given by its properties (IfcPermeableCoveringProperties). A permeable covering is a casement, such as a component, fixed or opening, consisting essentially of a frame and the infilling. The infilling is normally a grill, a louver or a screen. The way of operation is defined in the operation type.

The IfcPermeableCoveringProperties are included in the list of properties (HasPropertySets) of the IfcWindowStyle or the IfcDoorStyle. More information about the permeable covering can be included in the same list of the window or door style using the IfcPropertySet for dynamic extensions. This particularly applies for additional properties for the various operation types

The IfcPermeableCoveringProperties does not hold a geometric representation. However it defines parameters which can be used to create the shape of the IfcWindowStyle (which is inserted by the IfcWindow into the spatial context of the project), or of the IfcDoorStyle (which is inserted by the IfcDoor).

The parameters at the IfcPermeableCoveringProperties define a standard permeable covering. The outer boundary of the panel is determined by the occurrence parameter assigned to the IfcWindow or IfcDoor. It has to take the lining parameter into account as well. The position of the permeable covering within the overall window or door is determined by the PanelPosition attribute.

Figure 257 illustrates the panel applied to the position within the lining, as defined by the panel position attribute. The following parameters apply to that panel: FrameDepth, FrameThickness.

Figure 257 — Permeable covering properties

> HISTORY New entity in IFC2.0, it had been renamed from IfcPermeableCovering in IFC2x.

> IFC4 CHANGE Supertype changed to new IfcPreDefinedPropertySet.

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
5 | OperationType | IfcPermeableCoveringOperationEnum |  | Types of permeable covering operations. Also used to assign standard symbolic presentations according to national building standards. |  | X
6 | PanelPosition | IfcWindowPanelPositionEnum |  | Position of this permeable covering panel within the overall window or door type. |  | X
7 | FrameDepth | IfcPositiveLengthMeasure | ? | Depth of panel frame (used to include the permeable covering), measured from front face to back face horizontally (i.e. perpendicular to the window or door (elevation) plane. |  | X
8 | FrameThickness | IfcPositiveLengthMeasure | ? | Width of panel frame (used to include the permeable covering), measured from inside of panel (at permeable covering) to outside of panel (at lining), i.e. parallel to the window or door (elevation) plane. |  | X
9 | ShapeAspectStyle | IfcShapeAspect | ? | Optional link to a shape aspect definition, which points to the part of the geometric representation of the window style, which is used to represent the permeable covering. |  | X

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcRoot
1 | GlobalId | IfcGloballyUniqueId |  | Assignment of a globally unique identifier within the entire software world. | X | X

2

OwnerHistory

IfcOwnerHistory

?

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

X

3 | Name | IfcLabel | ? | 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 | X
4 | Description | IfcText | ? | Optional description, provided for exchanging informative comments. |  | X
IfcPropertyDefinition
| HasContext | IfcRelDeclares @RelatedDefinitions | S[0:1] |  |  | X
| HasAssociations | IfcRelAssociates @RelatedObjects | S[0:?] | Reference to the relationship IfcRelAssociates and thus to those externally defined concepts, like classifications, documents, or library information, which are associated to the property definition. |  | X
IfcPropertySetDefinition

DefinesType

IfcTypeObject
@HasPropertySets

S[0:?]

The type object to which the property set is assigned. The property set acts as a shared property set to all occurrences of the type object.

> NOTE The relationship between the IfcPropertySetDefinition and the IfcTypeObject is a direct relationship, not utilizing IfcRelDefinesByProperties, for maintaining compatibility with earlier releases of this standard.

> IFC4 CHANGE The cardinality has been changed from 0:1 to 0:? with upward compatibility for file based exchange.

X

IsDefinedBy

IfcRelDefinesByTemplate
@RelatedPropertySets

S[0:?]

Relation to the property set template, via the objectified relationship IfcRelDefinesByTemplate, that, if given, provides the definition template for the property set or quantity set and its properties.

> IFC4 CHANGE New inverse relationship, change made with upward compatibility for file based exchange.

X

DefinesOccurrence

IfcRelDefinesByProperties
@RelatingPropertyDefinition

S[0:?]

Reference to the relation to one or many object occurrences that are characterized by the property set definition. A single property set can be assigned to multiple object occurrences using the objectified relationship IfcRefDefinesByProperties.

> IFC4 CHANGE Inverse attribute renamed from PropertyDefinitionOf with upward compatibility for file-based exchange.

X

IfcPreDefinedPropertySet
IfcPermeableCoveringProperties
5 | OperationType | IfcPermeableCoveringOperationEnum |  | Types of permeable covering operations. Also used to assign standard symbolic presentations according to national building standards. |  | X
6 | PanelPosition | IfcWindowPanelPositionEnum |  | Position of this permeable covering panel within the overall window or door type. |  | X
7 | FrameDepth | IfcPositiveLengthMeasure | ? | Depth of panel frame (used to include the permeable covering), measured from front face to back face horizontally (i.e. perpendicular to the window or door (elevation) plane. |  | X
8 | FrameThickness | IfcPositiveLengthMeasure | ? | Width of panel frame (used to include the permeable covering), measured from inside of panel (at permeable covering) to outside of panel (at lining), i.e. parallel to the window or door (elevation) plane. |  | X
9 | ShapeAspectStyle | IfcShapeAspect | ? | Optional link to a shape aspect definition, which points to the part of the geometric representation of the window style, which is used to represent the permeable covering. |  | X

##### Definitions applying to Design Transfer View

Concept inheritance

# | Concept | Template | Model View
--- | --- | --- | ---
IfcRoot
| Revision Control | Revision Control | Design Transfer View

##### Definitions applying to BACnet View

Concept inheritance

# | Concept | Template | Model View
--- | --- | --- | ---
IfcRoot
| Revision Control | Revision Control | Design Transfer View

##### Formal representations

XML Specification
`<xs:element name="IfcPermeableCoveringProperties" type="ifc:IfcPermeableCoveringProperties" substitutionGroup="ifc:IfcPreDefinedPropertySet" nillable="true"/>
<xs:complexType name="IfcPermeableCoveringProperties">
<xs:complexContent>
<xs:extension base="ifc:IfcPreDefinedPropertySet">
<xs:sequence>
<xs:element name="ShapeAspectStyle" type="ifc:IfcShapeAspect" nillable="true" minOccurs="0"/>
</xs:sequence>
<xs:attribute name="OperationType" type="ifc:IfcPermeableCoveringOperationEnum" use="optional"/>
<xs:attribute name="PanelPosition" type="ifc:IfcWindowPanelPositionEnum" use="optional"/>
<xs:attribute name="FrameDepth" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
<xs:attribute name="FrameThickness" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcPermeableCoveringProperties
SUBTYPE OF (IfcPreDefinedPropertySet);
OperationType : IfcPermeableCoveringOperationEnum;
PanelPosition : IfcWindowPanelPositionEnum;
FrameDepth : OPTIONAL IfcPositiveLengthMeasure;
FrameThickness : OPTIONAL IfcPositiveLengthMeasure;
ShapeAspectStyle : OPTIONAL IfcShapeAspect;
END_ENTITY;

EXPRESS-G diagram

`

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