TRAXTransformer traxTransformer = traxTemplates.newTransformer();
assertNotNull("get transformer", traxTransformer);
// transform
traxTransformer.initResult(new StreamResult(byteOutputStream));
traxTransformer.transform(new StreamSource(res));
res.close();
assertTrue("Output is empty", byteOutputStream.size() > 0);
// other transformer from same templates