@SuppressWarnings("restriction")
   public static String serializePar(Model model) {
      Injector in = new ParStandaloneSetup().createInjectorAndDoEMFRegistration();
      Serializer serializer = in.getInstance(Serializer.class);
      return serializer.serialize(model, SaveOptions.newBuilder().format().getOptions());
   }

   public static Model parsePar(File f) {
      try {
         Injector in = new ParStandaloneSetup().createInjectorAndDoEMFRegistration();

         IParser parser = in.getInstance(ParParser.class);
         IParseResult result = parser.parse(new FileReader(f));
         Iterable<INode> errors = result.getSyntaxErrors();

         Iterator<INode> i = errors.iterator();
         if (i.hasNext()) {
            System.out.println("ERROR: " + i.toString());
            return null;
         }

         return (Model) result.getRootASTElement();
      } catch (Exception e) {
         return null;
      }
   }