WKB4J implements the Simple Features Specification for SQL as defined by the OpenGIS consortium .

WKB4J also implements the Two-and-a-half-D extensions for Simple Features proposal. This simple proposition extends the Simple Features Specification to handle height information without the complexity of a complete 3D system. It doesn't seem that it will be standardized by the OpenGIS Consortium any time soon, but several importants projects support it.