IFC (IFC4X3_ADD2) under development

4.2.4 Layer

Presentation layers may be used to organize geometry into groups that may be shown or hidden. Such designation is only for viewing and editing purposes and does not imply any semantic meaning.

The following diagram shows the generic classes and relationships used when applying this concept.

G IfcPresentationLayerAssignment IfcPresentationLayerAssignment 1. Name [1:1] 2. Description [0:1] 3. AssignedItems [1:?] 4. Identifier [0:1] IfcLabel IfcLabel IfcPresentationLayerAssignment:Name1->IfcLabel:IfcLabel0 IfcText IfcText IfcPresentationLayerAssignment:Description1->IfcText:IfcText0 IfcLayeredItem IfcLayeredItem IfcPresentationLayerAssignment:AssignedItems1->IfcLayeredItem:IfcLayeredItem0 IfcIdentifier IfcIdentifier IfcPresentationLayerAssignment:Identifier1->IfcIdentifier:IfcIdentifier0
Figure 4.2.4.A

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