/**
  * The deletePublisher method checks if a publisher exists and deletes
  * the publisher or returns an error message, as appropriate.
  *
  * @access public
  *
  * @param string $sessionId
  * @param integer $publisherId
  *
  * @return boolean
  */
 function deletePublisher($sessionId, $publisherId)
 {
     if ($this->verifySession($sessionId)) {
         return $this->_validateResult($this->_dllPublisher->delete($publisherId));
     } else {
         return false;
     }
 }