IfcStyledRepresentation

BACnet MVD

#### IfcStyledRepresentation

Natural language names

| Repräsentation mit Stilinformationen
| Styled Representation

##### Semantic definitions at the entity

Entity definition

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

Rule | Description
--- | ---

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

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcRepresentation
1 | ContextOfItems | IfcRepresentationContext |  | Definition of the representation context for which the different subtypes of representation are valid. | X | X
2 | RepresentationIdentifier | IfcLabel | ? | The optional identifier of the representation as used within a project. | X | X

3

RepresentationType

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.

X

X

4 | Items | IfcRepresentationItem | S[1:?] | Set of geometric representation items that are defined for this representation. | X | X

RepresentationMap

IfcRepresentationMap
@MappedRepresentation

S[0:1]

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

X

LayerAssignments

IfcPresentationLayerAssignment
@AssignedItems

S[0:?]

Assignment 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

X

OfProductRepresentation

IfcProductRepresentation
@Representations

S[0:?]

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.

X

IfcStyleModel
IfcStyledRepresentation

##### Formal representations

XML Specification
`<xs:element name="IfcStyledRepresentation" type="ifc:IfcStyledRepresentation" substitutionGroup="ifc:IfcStyleModel" nillable="true"/>
<xs:complexType name="IfcStyledRepresentation">
<xs:complexContent>
<xs:extension base="ifc:IfcStyleModel"/>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcStyledRepresentation
SUBTYPE OF (IfcStyleModel);
WHERE
OnlyStyledItems : SIZEOF(QUERY(temp <* SELF\IfcRepresentation.Items |
(NOT('IFCPRESENTATIONAPPEARANCERESOURCE.IfcStyledItem' IN TYPEOF(temp)))
)) = 0;
END_ENTITY;

EXPRESS-G diagram

`

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