IFC 4.3.2.20251031 (IFC4X3_ADD2) under development

4.1.9.8 Project Representation Context

项目表示上下文指示适用于项目或项目库中所有几何图形的坐标系方向、正北方向、精度和其他值。为3D模型和2D表示创建了一个主要的几何表示上下文，两者都可以使用几何表示子上下文进行进一步细化。

下图展示了应用此概念时使用的通用类和关系。 此外，概念可能对常见或标准化的行业实践和场景具有特殊意义。对于这些特定的使用场景，下表展示了用户可采用的推荐通用使用模式列表。

G <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcContext.htm'>IfcContext</a> IfcContext 1. GlobalId [1:1] 2. OwnerHistory [0:1] 3. Name [0:1] 4. Description [0:1]      HasAssignments [0:?]      Nests [0:1]      IsNestedBy [0:?]      HasContext [0:1]      IsDecomposedBy [0:?]      Decomposes [0:1]      HasAssociations [0:?] 5. ObjectType [0:1] 6. LongName [0:1] 7. Phase [0:1] 8. RepresentationContexts [1:?] 9. UnitsInContext [0:1]      IsDefinedBy [0:?]      Declares [0:?] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcGeometricRepresentationContext.htm'>IfcGeometricRepresentationContext</a> IfcGeometricRepresentationContext ContextIdentifier 1. ContextIdentifier [0:1] ContextType 2. ContextType [0:1]      RepresentationsInContext [0:?] 3. CoordinateSpaceDimension [1:1] 4. Precision [0:1] 5. WorldCoordinateSystem [1:1] 6. TrueNorth [0:1]      HasSubContexts [0:?]      HasCoordinateOperation [0:1] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcContext.htm'>IfcContext</a>:RepresentationContexts1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcGeometricRepresentationContext.htm'>IfcGeometricRepresentationContext</a>:IfcGeometricRepresentationContext0 IfcLabel_5 IfcLabel <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcContext.htm'>IfcContext</a>:Phase1->IfcLabel_5:IfcLabel0 IfcLabel_6 IfcLabel <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcContext.htm'>IfcContext</a>:ObjectType1->IfcLabel_6:IfcLabel0 IfcLabel_7 IfcLabel <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcContext.htm'>IfcContext</a>:LongName1->IfcLabel_7:IfcLabel0 IfcLabel_0 IfcLabel <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcGeometricRepresentationContext.htm'>IfcGeometricRepresentationContext</a>:ContextIdentifier1->IfcLabel_0:IfcLabel0 IfcLabel_1 IfcLabel <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcGeometricRepresentationContext.htm'>IfcGeometricRepresentationContext</a>:ContextType1->IfcLabel_1:IfcLabel0 <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcDimensionCount.htm'>IfcDimensionCount</a> IfcDimensionCount <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcGeometricRepresentationContext.htm'>IfcGeometricRepresentationContext</a>:CoordinateSpaceDimension1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcDimensionCount.htm'>IfcDimensionCount</a>:IfcDimensionCount0 <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcAxis2Placement3D.htm'>IfcAxis2Placement3D</a> IfcAxis2Placement3D      LayerAssignment [0:1]      StyledByItem [0:1] 1. Location [1:1] 2. Axis [0:1] 3. RefDirection [0:1] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcGeometricRepresentationContext.htm'>IfcGeometricRepresentationContext</a>:WorldCoordinateSystem1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcAxis2Placement3D.htm'>IfcAxis2Placement3D</a>:IfcAxis2Placement3D0 IfcDirection_2 IfcDirection      LayerAssignment [0:1]      StyledByItem [0:1] 1. DirectionRatios [2:3] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcGeometricRepresentationContext.htm'>IfcGeometricRepresentationContext</a>:TrueNorth1->IfcDirection_2:IfcDirection0 <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcGeometricRepresentationSubContext.htm'>IfcGeometricRepresentationSubContext</a> IfcGeometricRepresentationSubContext SubContextIdentifier 1. ContextIdentifier [0:1] SubContextType 2. ContextType [0:1]      RepresentationsInContext [0:?] 3. CoordinateSpaceDimension [1:1] 4. Precision [0:1] 5. WorldCoordinateSystem [1:1] 6. TrueNorth [0:1]      HasSubContexts [0:?]      HasCoordinateOperation [0:1] 7. ParentContext [1:1] 8. TargetScale [0:1] 9. TargetView [1:1] 10. UserDefinedTargetView [0:1] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcGeometricRepresentationContext.htm'>IfcGeometricRepresentationContext</a>:HasSubContexts1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcGeometricRepresentationSubContext.htm'>IfcGeometricRepresentationSubContext</a>:ParentContext0 <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcCartesianPoint.htm'>IfcCartesianPoint</a> IfcCartesianPoint      LayerAssignment [0:1]      StyledByItem [0:1] 1. Coordinates [1:3] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcAxis2Placement3D.htm'>IfcAxis2Placement3D</a>:Location1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcCartesianPoint.htm'>IfcCartesianPoint</a>:IfcCartesianPoint0 IfcDirection_0 IfcDirection      LayerAssignment [0:1]      StyledByItem [0:1] 1. DirectionRatios [2:3] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcAxis2Placement3D.htm'>IfcAxis2Placement3D</a>:Axis1->IfcDirection_0:IfcDirection0 IfcDirection_1 IfcDirection      LayerAssignment [0:1]      StyledByItem [0:1] 1. DirectionRatios [2:3] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcAxis2Placement3D.htm'>IfcAxis2Placement3D</a>:RefDirection1->IfcDirection_1:IfcDirection0 IfcLabel_2 IfcLabel <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcGeometricRepresentationSubContext.htm'>IfcGeometricRepresentationSubContext</a>:ContextIdentifier1->IfcLabel_2:IfcLabel0 IfcLabel_3 IfcLabel <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcGeometricRepresentationSubContext.htm'>IfcGeometricRepresentationSubContext</a>:ContextType1->IfcLabel_3:IfcLabel0 <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcPositiveRatioMeasure.htm'>IfcPositiveRatioMeasure</a> IfcPositiveRatioMeasure <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcGeometricRepresentationSubContext.htm'>IfcGeometricRepresentationSubContext</a>:TargetScale1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcPositiveRatioMeasure.htm'>IfcPositiveRatioMeasure</a>:IfcPositiveRatioMeasure0 <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcGeometricProjectionEnum.htm'>IfcGeometricProjectionEnum</a> IfcGeometricProjectionEnum <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcGeometricRepresentationSubContext.htm'>IfcGeometricRepresentationSubContext</a>:TargetView1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcGeometricProjectionEnum.htm'>IfcGeometricProjectionEnum</a>:IfcGeometricProjectionEnum0 IfcLabel_4 IfcLabel <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcGeometricRepresentationSubContext.htm'>IfcGeometricRepresentationSubContext</a>:UserDefinedTargetView1->IfcLabel_4:IfcLabel0
Figure 4.1.9.8.A

General Usage

ApplicableEntity
ContextIdentifier
IfcGeometricRepresentationContext.ContextIdentifier 		ContextType
IfcGeometricRepresentationContext.ContextType
IfcProject Model 3D
IfcProject Plan 2D
表 4.1.9.8.B

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