IfcStyledItem

Natural language names
Element mit Stilinformationen
Styled Item
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4
    IfcStyledItem
      StylesMODIFIEDType changed from IfcPresentationStyleAssignment to IfcStyleAssignmentSelect.
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.

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 399 illustrates use of IfcStyledItem for the two usage examples:

NOTE  The new IfcStyleAssignmentSelect allows the direct assignment styles, such as IfcCurveStyle, IfcSurfaceStyle without using the intermediate IfcPresentationStyleAssignment
2x4 example

Figure 399 — Styled item

Attribute definitions
#AttributeTypeCardinalityDescription G
1ItemIfcRepresentationItem? A geometric representation item to which the style is assigned.
IFC2x2 Add2 CHANGE The attribute Item has been made optional. Upward compatibility for file based exchange is guaranteed.
X
2StylesIfcStyleAssignmentSelectS[1:?] Representation styles which are assigned, either to an geometric representation item, or to a material definition.
IFC4 CHANGE The data type has been changed to IfcStyleAssignmentSelect with upward compatibility for file based exchange.
NOTE  Only the select item IfcPresentationStyle shall be used from IFC4 onwards, the IfcPresentationStyleAssignment has been deprecated.
X
3NameIfcLabel? The word, or group of words, by which the styled item is referred to.X
Formal Propositions
RuleDescription
ApplicableItemA styled item cannot be styled by another styled item.
Inherited definitions from supertypes
Entity inheritance IfcRepresentationItem
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRepresentationItem
LayerAssignmentIfcPresentationLayerAssignment
@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.
IFC2x3 CHANGE  The inverse attribute LayerAssignments has been added.
IFC4 CHANGE  The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.
X
StyledByItemIfcStyledItem
@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.
IFC2x3 CHANGE  The inverse attribute StyledByItem has been added.
X
IfcStyledItem
1ItemIfcRepresentationItem? A geometric representation item to which the style is assigned.
IFC2x2 Add2 CHANGE The attribute Item has been made optional. Upward compatibility for file based exchange is guaranteed.
X
2StylesIfcStyleAssignmentSelectS[1:?] Representation styles which are assigned, either to an geometric representation item, or to a material definition.
IFC4 CHANGE The data type has been changed to IfcStyleAssignmentSelect with upward compatibility for file based exchange.
NOTE  Only the select item IfcPresentationStyle shall be used from IFC4 onwards, the IfcPresentationStyleAssignment has been deprecated.
X
3NameIfcLabel? The word, or group of words, by which the styled item is referred to.X
Formal representations
XML 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;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcRepresentationItem IfcFillAreaStyleTiles

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