private void initDefaultWriters() {
registerWriter(Bbox.class, new BboxWriter());
registerWriter(Point.class, new PointWriter());
registerWriter(LineString.class, new LineStringWriter());
registerWriter(LinearRing.class, new LineStringWriter());
registerWriter(Polygon.class, new PolygonWriter());
registerWriter(MultiPoint.class, new MultiPointWriter());
registerWriter(MultiLineString.class, new MultiLineStringWriter());
registerWriter(MultiPolygon.class, new MultiPolygonWriter());
registerWriter(GeometryCollection.class, new GeometryCollectionWriter());
}