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(ZAxis, XAxis, Arg: IfcDirection)
: IfcDirection;
LOCAL
YAxis : IfcVector;
V : IfcDirection;
Temp : IfcVector;
END_LOCAL;
IF NOT EXISTS(Arg) THEN
V := IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcDirection([0.0,1.0,0.0]);
ELSE
V := Arg;
END_IF;
Temp := IfcScalarTimesVector(IfcDotProduct(V, ZAxis), ZAxis);
YAxis := IfcVectorDifference(V, Temp);
Temp := IfcScalarTimesVector(IfcDotProduct(V, XAxis), XAxis);
YAxis := IfcVectorDifference(YAxis, Temp);
YAxis := IfcNormalise(YAxis);
RETURN(YAxis.Orientation);
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