IFC 4.3.2.20251031 (IFC4X3_ADD2) under development

4.2.4 Layer

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表示图层可用于将几何体组织成可显示或隐藏的组。此类指定仅用于查看和编辑目的，不包含任何语义含义。

下图展示了应用此概念时使用的通用类和关系。

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

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