### 12.14.9 Functions That Test Spatial Relations Between Geometry Objects

The functions described in this section take two geometries as
arguments and return a qualitative or quantitative relation
between them.

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).

There is also a MySQL-specific set of MBR-based functions
available to test the relationship between two geometry values.