A compound curve is a sequence of ST_Curve values such that adjacent curves are joined at their endpoints. The contributing curves are limited to ST_LineString and ST_CircularString. The start point of each curve after the first is coincident with the end point of the previous curve.
ST_CompoundCurve constructor
ST_CurveN method for type ST_CompoundCurve
ST_NumCurves method for type ST_CompoundCurve
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