The Well-Known Text (WKT) representation of Geometry is designed to
exchange geometry data in ASCII form. For a Backus-Naur grammar that
specifies the formal production rules for writing WKT values, see the
OpenGIS specification document referenced in
https://mariadb.com/kb/en/gis-resources/.

URL: https://mariadb.com/kb/en/wkt-definition/

