@Override
 public void visit(PolyHedralSurface geom) {
   writeByteOrder(output);
   DimensionalFlag dimension = DimensionalFlag.valueOf(geom.is3D(), geom.isMeasured());
   writeTypeCodeAndSrid(geom, dimension, output);
   output.putUInt(geom.getNumPatches());
   for (Polygon pg : geom) {
     pg.accept(this);
   }
 }