| Attribute | Type | Defined By | 
|---|
|  StartTag | IfcLabel (STRING) | IfcAlignmentParameterSegment | 
|  EndTag | IfcLabel (STRING) | IfcAlignmentParameterSegment | 
|  StartPoint | IfcCartesianPoint (ENTITY) | IfcAlignmentHorizontalSegment | 
|  StartDirection | IfcPlaneAngleMeasure (REAL) | IfcAlignmentHorizontalSegment | 
|  StartRadiusOfCurvature | IfcLengthMeasure (REAL) | IfcAlignmentHorizontalSegment | 
|  EndRadiusOfCurvature | IfcLengthMeasure (REAL) | IfcAlignmentHorizontalSegment | 
|  SegmentLength | IfcNonNegativeLengthMeasure (REAL) | IfcAlignmentHorizontalSegment | 
|  GravityCenterLineHeight | IfcPositiveLengthMeasure (REAL) | IfcAlignmentHorizontalSegment | 
|  PredefinedType | IfcAlignmentHorizontalSegmentTypeEnum (ENUM) | IfcAlignmentHorizontalSegment |