/**
  * Creates a subscription description with specified XML string. 
  *
  * @param string $subscriptionDescriptionXml An XML based subscription
  * description.
  *
  * @return none
  */
 public static function create($subscriptionDescriptionXml)
 {
     $subscriptionDescription = new SubscriptionDescription();
     $root = simplexml_load_string($subscriptionDescriptionXml);
     $subscriptionDescriptionArray = (array) $root;
     if (array_key_exists('LockDuration', $subscriptionDescriptionArray)) {
         $subscriptionDescription->setLockDuration((string) $subscriptionDescriptionArray['LockDuration']);
     }
     if (array_key_exists('RequiresSession', $subscriptionDescriptionArray)) {
         $subscriptionDescription->setRequiresSession((bool) $subscriptionDescriptionArray['RequiresSession']);
     }
     if (array_key_exists('DefaultMessageTimeToLive', $subscriptionDescriptionArray)) {
         $subscriptionDescription->setDefaultMessageTimeToLive((string) $subscriptionDescriptionArray['DefaultMessageTimeToLive']);
     }
     if (array_key_exists('DeadLetteringOnMessageExpiration', $subscriptionDescriptionArray)) {
         $subscriptionDescription->setDeadLetteringOnMessageExpiration((string) $subscriptionDescriptionArray['DeadLetteringOnMessageExpiration']);
     }
     if (array_key_exists('DeadLetteringOnFilterEvaluationException', $subscriptionDescriptionArray)) {
         $subscriptionDescription->setDeadLetteringOnFilterEvaluationException((string) $subscriptionDescriptionArray['DeadLetteringOnFilterEvaluationException']);
     }
     if (array_key_exists('DefaultRuleDescription', $subscriptionDescriptionArray)) {
         $subscriptionDescription->setDefaultRuleDescription((string) $subscriptionDescriptionArray['DefaultRuleDescription']);
     }
     if (array_key_exists('MessageCount', $subscriptionDescriptionArray)) {
         $subscriptionDescription->setMessageCount((string) $subscriptionDescriptionArray['MessageCount']);
     }
     if (array_key_exists('MaxDeliveryCount', $subscriptionDescriptionArray)) {
         $subscriptionDescription->setMaxDeliveryCount((string) $subscriptionDescriptionArray['MaxDeliveryCount']);
     }
     if (array_key_exists('EnableBatchedOperations', $subscriptionDescriptionArray)) {
         $subscriptionDescription->setEnableBatchedOperations((bool) $subscriptionDescriptionArray['EnableBatchedOperations']);
     }
     return $subscriptionDescription;
 }