How to set priority in RQM while creating test case using Eclipse Lyo

Hello,

I am trying to create a test case using eclipse lyo. I am not able to set the priority using QName.
Please help

private static final String QM_NAMESPACE = "http://jazz.net/xmlns/prod/jazz/rqm/process/1.0/";
private static final String PRIORITY = "priority";

TestCase tc = new TestCase();      
tc.setTitle(rqmAdapterInput.getTestCaseDTO().getTitle());        tc.setDescription(rqmAdapterInput.getTestCaseDTO().getDescription());                      
QName priority = new QName(QM_NAMESPACE, PRIORITY,PRIORITY);       
Map<QName, Object> priorityMap = new HashMap<QName, Object>();       
priorityMap.put(priority, "literal.priority.130");                       
tc.setExtendedProperties(priorityMap);                               
String testcaseCreation = client.lookupCreationFactory(serviceProviderUrl,OSLCConstants.OSLC_QM_V2,              tc.getRdfTypes()[0].toString());               
System.out.println(testcaseCreation);       

ClientResponse creationResponse = client.createResource(testcaseCreation, tc,OslcMediaType.APPLICATION_RDF_XML);      

if (creationResponse.getStatusCode() != HttpServletResponse.SC_CREATED) {            System.err.println("ERROR: Could not create the test case (status "creationResponse.getStatusCode()+ ")\n");            System.err.println(creationResponse.getEntity(String.class));                  
 }       
creationResponse.consumeContent();       

String testcaseLocation = creationResponse.getHeaders().getFirst(HttpHeaders.LOCATION);        System.out.println("Test Case created a location " + testcaseLocation);