Hi Paolo,

I've encountered differing opinions on the validity of repeated vertices.
The ticket linked below summarizes the "invalid" argument, and includes a
link to the "valid" argument:
https://trac.osgeo.org/postgis/ticket/3425

Dan


On Wed, Feb 14, 2018 at 2:17 PM, Paolo Cavallini <cavall...@faunalia.it>
wrote:

> Hi all,
> we noticed two strange things in the behaviour of ST_IsValid:
> * repeated vertices are not considered invalid
> * in case of multiple intersections on a same polygon, only the first
> one is reported.
> Is there an explanation for this?
> Thanks.
> --
> Paolo Cavallini - www.faunalia.eu
> QGIS & PostGIS courses: http://www.faunalia.eu/training.html
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