IfcWindowType

Semantic definitions at the entity

Entity definition

The element type IfcWindowType defines commonly shared information for occurrences of windows. The set of shared information may include:

common properties within shared property sets
common material information
common partitioning of panels
common operation types of panels
common shape representations

A window type defines the particular parameter of the lining and one (or several) panels through the IfcWindowLiningProperties and the IfcWindowPanelProperties as predefined property sets applicable to windows only.

It is used to define a window specification, or window style (the specific product information that is common to all occurrences of that window type). Window types may be exchanged without being already assigned to occurrences.

Occurrences of the IfcWindowType within building models are represented by instances of IfcWindow or IfcWindowStandardCase.

HISTORY New entity in IFC4. The entity IfcWindowType replaces the previous definition IfcWindowStyle (which is deprecated in IFC4).

Partitioning type use definition

The IfcWindowTypePartitioningEnum defines the general layout of the window type and its symbolic presentation. Depending on the enumerator, the appropriate instances of IfcWindowLiningProperties and IfcWindowPanelProperties are attached in the list of HasPropertySets. The IfcWindowTypePartitioningEnum mainly determines the way of partitioning the window into individual window panels and thereby number and position of window panels.

See geometry use definitions at IfcWindowTypePartitioningEnum for the correct usage of panel partitioning and IfcWindowPanelProperties for the opening symbols for different panel operation types.

Material Use Definition

The material of the IfcWindowType is defined by the IfcMaterialConstituentSet or as fall back by IfcMaterial and attached by the IfcRelAssociatesMaterial.RelatingMaterial. It is accessible by the inverse HasAssociations relationship.

The following keywords for IfcMaterialConstituentSet.MaterialConstituents[n].Name shall be used:

'Lining' - to indicate that the material constituent applies to to the window lining
'Framing' - to indicate that the material constituent applies to to the window panels, if not provided, the 'Lining' material information applied to panels as well
'Glazing' - to indicate that the material constituent applies to to the glazing part

If the fall back single IfcMaterial is referenced, it applies to the lining and framing of the window.

Geometry Use Definitions:

The IfcWindowType may define the common shape of window occurrences. The common shape can be defined by

applying shape parameters defined within the associated IfcWindowLiningProperties and IfcWindowPanelProperties applied to the 'Profile' geometric representation. It is only applicable if the IfcWindowType has only occurrences of type IfcWindowStandardCase (See geometric use definition of IfcWindowStandardCase for further information).
applying the RepresentationMaps attribute to refer to a list of IfcRepresentationMap's, that allow for multiple geometric representations (e.g. with IfcShapeRepresentation's having an RepresentationIdentifier 'Box', 'Profile', 'FootPrint', or 'Body')
NOTE The product shape representations are defined as RepresentationMaps (attribute of the supertype IfcTypeProduct), which get assigned by an element occurrence instance through the IfcShapeRepresentation.Item[n] being an IfcMappedItem. See IfcTypeProduct for further information.

NOTE The values of attributes RepresentationIdentifier and RepresentationType of IfcShapeRepresentation are restricted in the same way as those for IfcWindow and IfcWindowStandardCase

Attribute definitions

#	Attribute	Type	Cardinality	Description	C
10	PredefinedType	IfcWindowTypeEnum	[1:1]	Identifies the predefined types of a window element from which the type required may be set.	X
11	PartitioningType	IfcWindowTypePartitioningEnum	[1:1]	Type defining the general layout of the window type in terms of the partitioning of panels.	X
12	ParameterTakesPrecedence	IfcBoolean	[0:1]	The Boolean value reflects, whether the parameter given in the attached lining and panel properties exactly define the geometry (TRUE), or whether the attached style shape take precedence (FALSE). In the last case the parameter have only informative value. If not provided, no such information can be infered.	X
13	UserDefinedPartitioningType	IfcLabel	[0:1]	Designator for the user defined partitioning type, shall only be provided, if the value of PartitioningType is set to USERDEFINED.	X

Formal Propositions

Rule	Description
CorrectPredefinedType	The inherited attribute ElementType shall be provided, if the PredefinedType is set to USERDEFINED.

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
IfcRoot
1	GlobalId	IfcGloballyUniqueId	[1:1]	Assignment of a globally unique identifier within the entire software world.	X
2	OwnerHistory	IfcOwnerHistory	[0:1]	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.	X
3	Name	IfcLabel	[0:1]	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
4	Description	IfcText	[0:1]	Optional description, provided for exchanging informative comments.	X
IfcObjectDefinition
	HasAssignments	IfcRelAssigns @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
	Nests	IfcRelNests @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).	X
	IsNestedBy	IfcRelNests @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).	X
	HasContext	IfcRelDeclares @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.	X
	IsDecomposedBy	IfcRelAggregates @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).	X
	Decomposes	IfcRelAggregates @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).	X
	HasAssociations	IfcRelAssociates @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
IfcTypeObject
5	ApplicableOccurrence	IfcIdentifier	[0:1]	The attribute optionally defines the data type of the occurrence object, to which the assigned type object can relate. If not present, no instruction is given to which occurrence object the type object is applicable. The following conventions are used: The IFC entity name of the applicable occurrence using the IFC naming convention, CamelCase with IFC prefix It can be optionally followed by the predefined type after the separator "/" (forward slash), using uppercase If one type object is applicable to many occurrence objects, then those occurrence object names should be separate by comma "," forming a comma separated string. EXAMPLE Refering to a furniture as applicable occurrence entity would be expressed as 'IfcFurnishingElement', refering to a brace as applicable entity would be expressed as 'IfcMember/BRACE', refering to a wall and wall standard case would be expressed as 'IfcWall, IfcWallStandardCase'.	X
6	HasPropertySets	IfcPropertySetDefinition	S[1:?]	Set ~~list~~ of unique property sets, that are associated with the object type and are common to all object occurrences referring to this object type.	X
	Types	IfcRelDefinesByType @RelatingType	S[0:1]	Reference to the relationship IfcRelDefinedByType and thus to those occurrence objects, which are defined by this type.	X
IfcTypeProduct
7	RepresentationMaps	IfcRepresentationMap	~L[1:?]	List of unique representation maps. Each representation map describes a block definition of the shape of the product style. By providing more than one representation map, a multi-view block definition can be given.	X
8	Tag	IfcLabel	[0:1]	The tag (or label) identifier at the particular type of a product, e.g. the article number (like the EAN). It is the identifier at the specific level.	X
	ReferencedBy	IfcRelAssignsToProduct @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 type.	X
IfcElementType
9	ElementType	IfcLabel	[0:1]	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
IfcBuildingElementType
IfcWindowType
10	PredefinedType	IfcWindowTypeEnum	[1:1]	Identifies the predefined types of a window element from which the type required may be set.	X
11	PartitioningType	IfcWindowTypePartitioningEnum	[1:1]	Type defining the general layout of the window type in terms of the partitioning of panels.	X
12	ParameterTakesPrecedence	IfcBoolean	[0:1]	The Boolean value reflects, whether the parameter given in the attached lining and panel properties exactly define the geometry (TRUE), or whether the attached style shape take precedence (FALSE). In the last case the parameter have only informative value. If not provided, no such information can be infered.	X
13	UserDefinedPartitioningType	IfcLabel	[0:1]	Designator for the user defined partitioning type, shall only be provided, if the value of PartitioningType is set to USERDEFINED.	X

Definitions applying to Common Use Definitions

Instance diagram

Concept usage

Type Body Geometry

The Type Body Geometry concept applies to this entity.

Property Sets for Types

The Property Sets for Types concept applies to this entity.

Two subtypes of IfcPreDefinedPropertySet are applicable to IfcWindowType:

IfcWindowLiningProperties - a single instance to define the shape parameters of the window lining
IfcWindowPanelProperties - one or several instances to define the shape parameters of the window panel(s)

Concept inheritance

#	Concept	Model View
IfcRoot
	Software Identity	Common Use Definitions
	Revision Control	Common Use Definitions
IfcTypeProduct
	Product Type Shape	Common Use Definitions
IfcWindowType
	Type Body Geometry	Common Use Definitions
	Property Sets for Types	Common Use Definitions

Formal representations

XSD Specification

 <xs:element name="IfcWindowType" type="ifc:IfcWindowType" substitutionGroup="ifc:IfcBuildingElementType" nillable="true"/>

 <xs:complexType name="IfcWindowType">

  <xs:complexContent>

   <xs:extension base="ifc:IfcBuildingElementType">

    <xs:attribute name="PredefinedType" type="ifc:IfcWindowTypeEnum" use="optional"/>

    <xs:attribute name="PartitioningType" type="ifc:IfcWindowTypePartitioningEnum" use="optional"/>

    <xs:attribute name="ParameterTakesPrecedence" type="ifc:IfcBoolean" use="optional"/>

    <xs:attribute name="UserDefinedPartitioningType" type="ifc:IfcLabel" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcWindowType

 SUBTYPE OF (IfcBuildingElementType);

  PredefinedType : IfcWindowTypeEnum;

  PartitioningType : IfcWindowTypePartitioningEnum;

  ParameterTakesPrecedence : OPTIONAL IfcBoolean;

  UserDefinedPartitioningType : OPTIONAL IfcLabel;

 WHERE

  CorrectPredefinedType : (PredefinedType <> IfcWindowTypeEnum.USERDEFINED) OR
((PredefinedType = IfcWindowTypeEnum.USERDEFINED) AND EXISTS(SELF\IfcElementType.ElementType));
END_ENTITY;

 EXPRESS-G diagram

Link to this page

Item	Change	Description
IFC2x3 to IFC4
IfcWindowType	ADDED
IFC4 Addendum 1
IfcWindowType
ParameterTakesPrecedence	MODIFIED	Type changed from BOOLEAN to IfcBoolean.

	Fenster - Typ
	Window Type
	Type de fenêtre