IFC 4.3.x development

8.18.3.16 IfcStyledRepresentation

Change log

IFC4

additionswhere_rulesOnlyStyledItems
deletionswhere_rulesWR21

IFC4X1

additionswhere_rulesOnlyStyledItems
deletionswhere_rulesOnlyStyledItems

IFC4X2

additionswhere_rulesOnlyStyledItems
deletionswhere_rulesOnlyStyledItems

IFC4X3_RC3

additionswhere_rulesOnlyStyledItems
deletionswhere_rulesOnlyStyledItems

8.18.3.16.1 Semantic definitions at the entity

The IfcStyledRepresentation represents the concept of a styled presentation being a representation of a product or a product component, like material. within a representation context. This representation context does not need to be (but may be) a geometric representation context.

NOTE  Current usage of IfcStyledRepresentation is restricted to the assignment of presentation information to an material. The IfcStyledRepresentation includes only presentation styles (IfcCurveStyle, FillAreaStyle, IfcSurfaceStyle) that define how a material should be presented within a particular (eventually view and scale dependent) representation context. All instances of IfcStyledRepresentation are referenced by IfcMaterialDefinitionRepresentation, and assigned to IfcMaterial by IfcMaterialDefinitionRepresentation.RepresentedMaterial.

A styled representation has to include one or several styled items with the associated style information (curve, symbol, text, fill area, or surface styles). It shall not contain the geometric representation items that are styled.

HISTORY  New entity in IFC2x2.

Formal Propositions

OnlyStyledItems

Only IfcStyledItem's (or subtypes) are allowed as members in the list of Items, inherited from IfcRepresentation.

IFC2x3 CHANGE  New where rule to ensure the usage for material definition representations, and other non-shape representations

# Attribute Type Description
IfcRepresentation
1 ContextOfItems IfcRepresentationContext Definition of the representation context for which the different subtypes of representation are valid.
2 RepresentationIdentifierOPTIONAL IfcLabel The optional identifier of the representation as used within a project.
3 RepresentationType OPTIONAL IfcLabel The description of the type of a representation context. The representation type defines the type of geometry or topology used for representing the product representation. More information is given at the subtypes IfcShapeRepresentation and IfcTopologyRepresentation.

The supported values for context type are to be specified by implementers agreements.
4 Items SET [1:?] OF IfcRepresentationItem Set of geometric representation items that are defined for this representation.
RepresentationMap SET [0:1] OF IfcRepresentationMap FOR MappedRepresentation Use of the representation within an IfcRepresentationMap. If used, this IfcRepresentation may be assigned to many representations as one of its Items using an IfcMappedItem. Using IfcRepresentationMap is the way to share one representation (often of type IfcShapeRepresentation) by many products.

> IFC2x3 CHANGE  The inverse attribute LayerAssignments has been added
LayerAssignments SET [0:?] OF IfcPresentationLayerAssignment FOR AssignedItemsAssignment of the whole representation to a single or multiple layer(s). The LayerAssigments can be overridden by LayerAssigments of the IfcRepresentationItem's within the list of Items.

> NOTE  Implementation agreements can restrict the maximum number of layer assignments to 1.

> IFC2x3 CHANGE  The inverse attribute LayerAssignments has been added
OfProductRepresentation SET [0:?] OF IfcProductRepresentation FOR Representations Reference to the product representations to which this individual representation applies. In most cases it is the reference to one or many product shapes, to which this shape representation is applicable.

> IFC4 CHANGE Inverse relationship cardinality relaxed to be 0:N.

8.18.3.16.1 Entity inheritance

dot_inheritance IfcStyledRepresentation IfcStyledRepresentation IfcStyleModel IfcStyleModel IfcStyledRepresentation->IfcStyleModel IfcRepresentation IfcRepresentation IfcStyleModel->IfcRepresentation IfcShapeModel IfcShapeModel IfcShapeModel->IfcRepresentation

8.18.3.16.2 Formal representations

ENTITY IfcStyledRepresentation
 SUBTYPE OF (IfcStyleModel);
 WHERE
	OnlyStyledItems : SIZEOF(QUERY(temp <* SELF\IfcRepresentation.Items | 
  (NOT('IFC4X3_DEV_a1492713.IFCSTYLEDITEM' IN TYPEOF(temp)))
)) = 0;
END_ENTITY;