Well-known text (WKT) is a text markup language for representing vector geometry objects, spatial reference systems of spatial objects and transformations between spatial reference systems. In Redbex WKT is used for geometries for spatial data.

While there it the original specification of WKT[1] and various vendor specific specification of the WKT format, the WKT used in Redbex sticks closely to the OpenGIS Coordinate Transformation Service Implementation Specification issued by the Open Geospatial Consortium[2]. However the implemented WKT parser is robust and might tolerate WKT presentations that are not fully conformant with the above mentioned standard.

This chapter gives a brief overview of the WKT format as used in Redbex, for further reading we suggest to get the original specification from www.opengeospatial.org.