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An ST_MultiCurve is a collection of zero or more ST_Curve values, and all of the curves are within the spatial reference system. The length of a multicurve is the sum of the lengths of the contained curves. A multicurve is closed if it is non-empty and has an empty boundary.
ST_IsClosed method for type ST_MultiCurve
ST_Length method for type ST_MultiCurve
ST_MultiCurveAggr method for type ST_MultiCurve
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