cart.addItem("HelloWorld 2GB MP3 Player",
"HelloWorld, the simple MP3 player", 159.99f, 1);
Diff myDiff = new Diff(shoppingCartSimple, cart.getXml());
Validator v = new Validator(cart.getXml());
//v.useXMLSchema(true);
//v.setJAXP12SchemaSource(xsd);
//assertTrue("XML valid ", v.isValid());