Possible discrepancy: Are both FootPrint and Axis required for Alignment Geometry - Horizontal and Vertical?

[RickBrice]

Looking at concept templates 4.1.7.1.1.1 Alignment Geometry - Horizontal and 4.1.7.1.1.2 Alignment Geometry - Horizontal and Vertical, the RepresentationIdentifier for the IfcCompositeCurve in the Horizontal case is Axis and it is FootPrint for the Horizontal and Vertical case.

Taken at face value, that would mean for Alignment Geometry - Horizontal and Vertical IfcAlignment.Representation.Representations must equal 3.

1. "Axis" and "Curve2D" for Horizontal only
2. "FootPrint" and "Curve2D" for Horizontal and Vertical (for the IfcCompositeCurve)
3. "Axis" and "Curve3D" for Horizontal and Vertical (for the IfcGradientCurve)

The same is true for CT 4.1.7.1.1.3 Alignment Geometry - Horizontal, Vertical, and Cant

As is, complying with CT 4.1.7.1.1.2 and .3 does not implicitly provide compliance with CT 4.1.7.1.1.1.

Is it intended that the RepresentationIdentifier for the horizontal geometry only be different? If this is just a documentation discrepancy, should "FootPrint" be changed to "Axis" in the vertical and cant CTs, or should "Axis" be changed to "FootPrint" in the horizontal only CT?