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Description: 
 A Prism
is a 
Region which represents an extrusion of an existing Region into one or more
orthogonal dimensions (specified by another Region). If the Region to be extruded has N
axes, and the Region defining the extrusion has M axes, then the resulting Prism will have
(M
N)
axes. A point is inside the Prism if the first N axis values correspond to a point
inside the Region being extruded, and the remaining M axis values correspond to a point
inside the Region defining the extrusion.
As an example, a cylinder can be represented by extruding an existing Circle, using an
Interval to define the extrusion. Ih this case, the Interval would have a single axis
and would specify the upper and lower limits of the cylinder along its length.  
Constructor Function 
  Inheritance  
 The Prism class inherits from the
Region class.  
  Attributes  
 The Prism class does not define any new attributes beyond
those which are applicable to all Regions.  
  Functions  
 The Prism class does not
define any new functions beyond those which are applicable to all Regions.
 Copyright (C) 2021 East Asian Observatory
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 A Library for Handling
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Coordinate Systems
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