A MultiCurve is a geometry collection
        composed of Curve elements.
        MultiCurve is a non-instantiable class.
      
        MultiCurve
        Properties
      
            A MultiCurve is a one-dimensional
            geometry.
          
            A MultiCurve is simple if and only if all
            of its elements are simple; the only intersections between
            any two elements occur at points that are on the boundaries
            of both elements.
          
            A MultiCurve boundary is obtained by
            applying the 「mod 2 union rule」 (also known as
            the 「odd-even rule」): A point is in the
            boundary of a MultiCurve if it is in the
            boundaries of an odd number of MultiCurve
            elements.
          
            A MultiCurve is closed if all of its
            elements are closed.
          
            The boundary of a closed MultiCurve is
            always empty.
          

