/**
 \defgroup ITKSpatialObjects Module ITKSpatialObjects 
 SpatialObjects are intended to represent regions in space.
The basic functionality of an itk::SpatialObject is to answer the question of
whether a physical point is inside or outside of the itk::SpatialObject. They are
commonly used for representing masks in an analytical form, as well as
approximations of shape by combining them into hierarchical structures similar
to scene graphs. 
 \par Dependencies:
 \li \ref ITKCommon 
 \li \ref ITKImageFunction 
 \li \ref ITKMesh 
 \li \ref ITKMetaIO 
 \li \ref ITKTransform 
 \dot 
 graph "ITKSpatialObjects" { 
 "ITKSpatialObjects" -- "ITKCommon"; 
 "ITKSpatialObjects" -- "ITKImageFunction"; 
 "ITKSpatialObjects" -- "ITKMesh"; 
 "ITKSpatialObjects" -- "ITKMetaIO"; 
 "ITKSpatialObjects" -- "ITKTransform"; 
 } 
 \enddot 
 */