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20252453-T-424 项目

4.1.9.8.1 项目表示上下文 2D(Project Representation Context 2D)

为2D表示创建的主要几何表示上下文,可以使用几何表示子上下文进一步细化以适应特定的2D上下文。

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。

<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 constraint_0 =2 <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcDimensionCount.htm'>IfcDimensionCount</a>->constraint_0 <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 <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_2 IfcLabel <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcGeometricRepresentationSubContext.htm'>IfcGeometricRepresentationSubContext</a>:UserDefinedTargetView1->IfcLabel_2:IfcLabel0 IfcLabel_3 IfcLabel <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcGeometricRepresentationSubContext.htm'>IfcGeometricRepresentationSubContext</a>:ContextIdentifier1->IfcLabel_3:IfcLabel0 IfcLabel_4 IfcLabel <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcGeometricRepresentationSubContext.htm'>IfcGeometricRepresentationSubContext</a>:ContextType1->IfcLabel_4:IfcLabel0
Figure 4.1.9.8.1.A

General Usage

ApplicableEntity
IfcProject
表 4.1.9.8.1.B