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      14.16.9 Functions That Test Spatial Relations Between Geometry Objects
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       14.16.9.1 Spatial Relation Functions That Use Object Shapes
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       14.16.9.2 Spatial Relation Functions That Use Minimum Bounding Rectangles
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  <p>
   The functions described in this section take two geometries as
      arguments and return a qualitative or quantitative relation
      between them.
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   MySQL implements two sets of functions using function names
      defined by the OpenGIS specification. One set tests the
      relationship between two geometry values using precise object
      shapes, the other set uses object minimum bounding rectangles
      (MBRs).
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