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Determines whether the geometry value is simple (containing no self intersections or other irregularities).
Returns 1 if the geometry value is simple, otherwise 0.
SQL/MM (ISO/IEC 13249-3: 2006)
The following returns the result 29 because the corresponding multi linestring contains two lines which cross.
SELECT ShapeID FROM SpatialShapes WHERE Shape.ST_IsSimple() = 0