model.outputPDL(out);
if (true) { throw new Error("not implemented"); }
    public static void writePDL(MetadataRoot root, File directory)        throws IOException {        Iterator models = root.getModels();        while (models.hasNext()) {            Model model = (Model)models.next();            PrintStream out = new PrintStream(new FileOutputStream(new File(directory, model.getName() + ".pdl")));            model.outputPDL(out);            out.close();        }    }