IFC 4.3.2.20251031 (IFC4X3_ADD2) under development

4.2.1 Coordinate Reference System in WKT

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/IfcCoordinateReferenceSystem.htm'>IfcCoordinateReferenceSystem</a> IfcCoordinateReferenceSystem CRSName 1. Name [0:1] 2. Description [0:1] 3. GeodeticDatum [0:1]      HasCoordinateOperation [0:1] HasWKTDescription      WellKnownText [0:1] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcWellKnownText.htm'>IfcWellKnownText</a> IfcWellKnownText WKTLiteral 1. WellKnownText [1:1] 2. CoordinateReferenceSystem [1:1] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcCoordinateReferenceSystem.htm'>IfcCoordinateReferenceSystem</a>:WellKnownText1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcWellKnownText.htm'>IfcWellKnownText</a>:CoordinateReferenceSystem0 IfcLabel_0 IfcLabel <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcCoordinateReferenceSystem.htm'>IfcCoordinateReferenceSystem</a>:Name1->IfcLabel_0:IfcLabel0 IfcWellKnownTextLiteral_0 IfcWellKnownTextLiteral <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcWellKnownText.htm'>IfcWellKnownText</a>:WellKnownText1->IfcWellKnownTextLiteral_0:IfcWellKnownTextLiteral0 constraint_0 ='WKT' IfcLabel_0->constraint_0
Figure 4.2.1.A

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