Group2GroupTransformer group2GroupTransformer = new Group2GroupTransformer();
group2GroupTransformer.setMediator(mediator);
transformers.addTransformer(group2GroupTransformer);
transformers.addTransformer(new InputSource2Node());
transformers.addTransformer(new InputSource2SAX());
transformers.addTransformer(new InputStream2Node());
transformers.addTransformer(new InputStream2SAX());
transformers.addTransformer(new DOMNode2JavaBeanTransformer());