public static String toPMML(String dott) throws IOException {
// Create a resource set to hold the resources.
//
ResourceSet resourceSet = new ResourceSetImpl();
// Register the appropriate resource factory to handle all file
// extensions.
//
resourceSet.getResourceFactoryRegistry().getExtensionToFactoryMap()
.put(Resource.Factory.Registry.DEFAULT_EXTENSION,
new _40ResourceFactoryImpl());
// Register the package to ensure it is available during loading.
//
resourceSet.getPackageRegistry().put(_40Package.eNS_URI,
_40Package.eINSTANCE);
TreeBuild builder = new TreeBuild();
Node nodeOfWeka = builder.create(new StringReader(dott));
Resource resource = resourceSet.createResource(URI.createURI("http://www.admire-project.eu/PMML-4_0"));
DocumentRoot documentRoot = _40Factory.eINSTANCE.createDocumentRoot();
PMMLType pmml = _40Factory.eINSTANCE.createPMMLType();
pmml.setVersion("4.0");