map.put("tagVO", "{http://tags}thetag");
provider.setOutTransformElements(map);
Map<String, String> nsmap = new HashMap<String, String>();
nsmap.put("http://tags", "ps1");
provider.setNamespaceMap(nsmap);
TagVO tag = new TagVO("A", "B");
ByteArrayOutputStream bos = new ByteArrayOutputStream();
provider.writeTo(tag, TagVO.class, TagVO.class,
new Annotation[0], MediaType.TEXT_XML_TYPE, new MetadataMap<String, Object>(), bos);
String expected = "{\"ps1.thetag\":{\"group\":\"B\",\"name\":\"A\"}}";
assertEquals(expected, bos.toString());