function fetchParticipant($itemID, $participantID)
 {
     if ($participantID === false) {
         $user = eZUser::currentUser();
         $participantID = $user->attribute('contentobject_id');
     }
     $participant = eZCollaborationItemParticipantLink::fetch($itemID, $participantID);
     if ($participant === null) {
         $resultArray = array('error' => array('error_type' => 'kernel', 'error_code' => eZError::KERNEL_NOT_FOUND));
     } else {
         $resultArray = array('result' => $participant);
     }
     return $resultArray;
 }
 function participant()
 {
     return eZCollaborationItemParticipantLink::fetch( $this->CollaborationID, $this->ParticipantID );
 }