# ST_IsSimple

### Signature

### Description

Returns true if `geom`

is simple.

The SFS definition of simplicity follows the general rule that a Geometry is simple if it has no points of self-tangency, self-intersection or other anomalous points.

Simplicity is defined for each Geometry subclass as follows:

- Valid polygonal geometries are simple, since their rings must not self-intersect.
- Linear rings have the same semantics.
- Linear geometries are simple iff they do not self-intersect at points other than boundary points.
- Zero-dimensional geometries (points) are simple iff they have no repeated points.
- Empty Geometries are always simple.