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
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcPresentationLayerAssignment.htm">IfcPresentationLayerAssignment</a>
IfcPresentationLayerAssignment 1. Name
[1:1]
2. Description
[0:1]
3. AssignedItems
[1:?]
4. Identifier
[0:1]
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcLabel.htm">IfcLabel</a>
IfcLabel
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcPresentationLayerAssignment.htm">IfcPresentationLayerAssignment</a>:Name1-><a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcLabel.htm">IfcLabel</a>:IfcLabel0
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcText.htm">IfcText</a>
IfcText
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcPresentationLayerAssignment.htm">IfcPresentationLayerAssignment</a>:Description1-><a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcText.htm">IfcText</a>:IfcText0
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcLayeredItem.htm">IfcLayeredItem</a>
IfcLayeredItem
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcPresentationLayerAssignment.htm">IfcPresentationLayerAssignment</a>:AssignedItems1-><a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcLayeredItem.htm">IfcLayeredItem</a>:IfcLayeredItem0
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcIdentifier.htm">IfcIdentifier</a>
IfcIdentifier
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcPresentationLayerAssignment.htm">IfcPresentationLayerAssignment</a>:Identifier1-><a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcIdentifier.htm">IfcIdentifier</a>:IfcIdentifier0
Figure 4.2.4.A