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 16.2.10 Class `MultiCurve'
 --------------------------
 
 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.
 

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