AutoCAD Map 3D 2009 Geospatial Platform Reference
From AutoCAD Map 3D Geospatial Platform API
WKT
[Glossary]
Well Known Text format. A method used to exchange geometry information in textual form. For more information, see the OpenGIS Project Document 99-049, Simple Features Specification For SQL, http://www.opengeospatial.org/docs/99-049.pdf.