Arcade IsSimple() function docs: Explain what “topologically simple” means

[Bud]

In the Arcade IsSimple() function docs:

IsSimple(inputGeometry) -> Boolean

Indicates if the given geometry is topologically simple.

It would help if the docs could explain what is meant by “topologically simple”. Not everyone reading those docs is fluent in topology lingo.

[DavidPike]

possibly https://developers.arcgis.com/net/api-reference/api/netstandard/Esri.ArcGISRuntime/Esri.ArcGISRuntim... but explicitly detailed or a link to guidance would of-course be better.

[Bud]

@DavidPike 

For what it’s worth, the St_geometry docs (page 18) explain it like this:

The ST_LineString is simple if it does not intersect its interior.

The graphic below shows examples of ST_LineString objects: (1) is a simple, nonclosed ST_LineString; (2) is a nonsimple, nonclosed ST_LineString; (3) is a closed, simple ST_LineString and, therefore, a ring; and (4) is a closed, nonsimple ST_LineString—it is not a ring.