/**
  * Constructor
  */
 function __construct($emailKey = null, $locale = null)
 {
     parent::__construct($emailKey, $locale);
     $this->callback = null;
     $this->frequency = 10;
 }
 /**
  * Constructor.
  * @param $submission Submission
  * @param $emailKey string optional
  * @param $locale string optional
  * @param $context object optional
  * @param $includeSignature boolean optional
  * @see MailTemplate::MailTemplate()
  */
 function __construct($submission, $emailKey = null, $locale = null, $context = null, $includeSignature = true)
 {
     parent::__construct($emailKey, $locale, $context, $includeSignature);
     $this->submission = $submission;
 }