/**
  * Populates the properties with a specified XML string based on ATOM 
  * ENTRY schema. 
  * 
  * @param string $xmlString An XML string representing a rule info instance.
  * 
  * @return none
  */
 public function parseXml($xmlString)
 {
     $this->_entry->parseXml($xmlString);
     $content = $this->_entry->getContent();
     if (is_null($content)) {
         $this->_ruleDescription = null;
     } else {
         $this->_ruleDescription = RuleDescription::create($content->getText());
     }
 }