code: public InternalTile paint(InternalTile tile) throws RenderException {
  		if (tile.getContentType().equals(VectorTileContentType.URL_CONTENT)) {
  			if (urlBuilder != null) {
  				if (paintGeometries) {
  					urlBuilder.paintGeometries(paintGeometries);
  					urlBuilder.paintLabels(false);
  					tile.setFeatureContent(urlBuilder.getImageUrl());
  				}
  				if (paintLabels) {
  					urlBuilder.paintGeometries(false);
  					urlBuilder.paintLabels(paintLabels);
  					tile.setLabelContent(urlBuilder.getImageUrl());
  				}
  				return tile;
  			}
  		}
  		return tile;
  	}
docs: Painter the tile, by building a URL where the image can be found.
  
  @param tile
  Must be an instance of {@link InternalTile}, and must have a non-null {@link RasterUrlBuilder}.
  @return Returns a {@link InternalTile}.