IfcStyledItem

Semantic definitions at the entity

Entity definition

The IfcStyledItem holds presentation style information for products, either explicitly for an IfcGeometricRepresentationItem being part of an IfcShapeRepresentation assigned to a product, or by assigning presentation information to IfcMaterial being assigned as other representation for a product.

If the IfcStyledItem is used within a reference from an IfcProductDefinitionShape then one Item shall be provided.
If the IfcStyledItem is used within a reference from an IfcMaterialDefinitionRepresentation then no Item shall be provided.

NOTE Definition according to ISO/CD 10303-46:1992
The styled item is an assignment of style for presentation to a geometric representation item as it is used in a representation.

NOTE Entity adapted from styled_item defined in ISO10303-46.

HISTORY New entity in IFC2x2.

IFC2x2 Addendum 1 CHANGE The entity IfcStyledItem has been made non abstract and the attribute Name added.

IFC2x3 CHANGE The attribute Item has been made optional, upward compatibility for file based exchange is guaranteed.

IFC4 CHANGE The subtype IfcAnnotationOccurrence and its subtypes are deleted. Use IfcStyledItem for all instantiations. The data type of Styles has been changed to IfcStyleAssignmentSelect

Use Definition

Figure 366 illustrates use of IfcStyledItem for the two usage examples:

As a presentation for a geometric representation item
As a presentation for a material definition

NOTE The new IfcStyleAssignmentSelect allows the direct assignment styles, such as IfcCurveStyle, IfcSurfaceStyle without using the intermediate IfcPresentationStyleAssignment

Figure 366 — Styled item

Attribute definitions

#	Attribute	Type	Cardinality	Description	C
1	Item	IfcRepresentationItem	[0:1]	A geometric representation item to which the style is assigned.	X
2	Styles	IfcStyleAssignmentSelect	S[1:?]	Representation styles which are assigned, either to an geometric representation item, or to a material definition.	X
3	Name	IfcLabel	[0:1]	The word, or group of words, by which the styled item is referred to.	X

Formal Propositions

Rule	Description
ApplicableItem	A styled item cannot be styled by another styled item.

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
IfcRepresentationItem
	LayerAssignment	IfcPresentationLayerAssignment @AssignedItems	S[0:1]	Assignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items.	X
	StyledByItem	IfcStyledItem @Item	S[0:1]	Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.	X
IfcStyledItem
1	Item	IfcRepresentationItem	[0:1]	A geometric representation item to which the style is assigned.	X
2	Styles	IfcStyleAssignmentSelect	S[1:?]	Representation styles which are assigned, either to an geometric representation item, or to a material definition.	X
3	Name	IfcLabel	[0:1]	The word, or group of words, by which the styled item is referred to.	X

Formal representations

XSD Specification

 <xs:element name="IfcStyledItem" type="ifc:IfcStyledItem" substitutionGroup="ifc:IfcRepresentationItem" nillable="true"/>

 <xs:complexType name="IfcStyledItem">

  <xs:complexContent>

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

    <xs:sequence>

     <xs:element name="Styles">

      <xs:complexType>

       <xs:group ref="ifc:IfcStyleAssignmentSelect" maxOccurs="unbounded"/>

       <xs:attribute ref="ifc:itemType" fixed="ifc:IfcStyleAssignmentSelect"/>

       <xs:attribute ref="ifc:cType" fixed="set"/>

       <xs:attribute ref="ifc:arraySize" use="optional"/>

      </xs:complexType>

     </xs:element>

    </xs:sequence>

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

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcStyledItem

 SUBTYPE OF (IfcRepresentationItem);

  Item : OPTIONAL IfcRepresentationItem;

  Styles : SET [1:?] OF IfcStyleAssignmentSelect;

  Name : OPTIONAL IfcLabel;

 WHERE

  ApplicableItem : NOT('IFCPRESENTATIONAPPEARANCERESOURCE.IFCSTYLEDITEM' IN TYPEOF(Item));
END_ENTITY;

 EXPRESS-G diagram

Item	Change	Description
IFC2x3 to IFC4
IfcStyledItem
Styles	MODIFIED	Type changed from IfcPresentationStyleAssignment to IfcStyleAssignmentSelect.

	Element mit Stilinformationen
	Styled Item