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");
documentRoot.setPMML(pmml);
HeaderType header = _40Factory.eINSTANCE.createHeaderType();
header.setCopyright("www.admire-project.eu");
header.setDescription("Tree model");
pmml.setHeader(header);