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What is the placement of curve IfcLinearPlacement.PlacementMeasuredAlong

IfcLinearPlacement.PlacementMeasuredAlong references to curve, but what coordinate system is used for the curve?

I have to search IfcProduct that has the curve in Representations and use ObjectPlacement to have answer.

If this is curve referenced by IfcAlignment.Axis - I possible have to use its ObjectPlacemenyt but see no specification for this at all.