factory.addFunction(new GeometryUnion());
factory.addFunction(new GeometryIntersection());
factory.addFunction(new GeometryDifference());
factory.addFunction(new GeometrySymDifference());
factory.addFunction(new GeometryBoundary());
factory.addFunction(new GeometryCentroid());
factory.addFunction(new GeometryConvexHull());
factory.addFunction(new ConvertToMetre());
factory.addFunction(new ConvertToSquareMetre());