/**
  * 
  * Returns all the failures as XML formatted string
  * @throws Exception
  */
 public static function toXML(KalturaTestProcedureFailure $testProcedureFailure, $rootNodeName = 'data')
 {
     if (count($testProcedureFailure->getTestCaseInstanceFailures()) == 0) {
         return "";
     }
     $dom = new DOMDocument("1.0");
     //Create elements in the Dom referencing the entire test data file
     $testProcedureElement = $dom->createElement($rootNodeName);
     $testProcedureElement->setAttribute("testProcedureName", $testProcedureFailure->getTestProcedureName());
     $dom->appendChild($testProcedureElement);
     //For each unit test data
     foreach ($testProcedureFailure->getTestCaseInstanceFailures() as $testCaseInstanceFailure) {
         //Create the xml from the object
         $objectAsDOM = KalturaTestCaseInstanceFailure::toXml($testCaseInstanceFailure, "TestCaseInstance");
         kXml::appendDomToElement($objectAsDOM, $testProcedureElement, $dom);
     }
     return $dom;
 }