public function getResourceVersion($con = null)
 {
     if ($this->aResourceVersion === null && $this->resource_version_id !== null) {
         include_once 'plugins/sfPropelVersionableBehaviorPlugin/lib/model/om/BaseResourceVersionPeer.php';
         $this->aResourceVersion = ResourceVersionPeer::retrieveByPK($this->resource_version_id, $con);
     }
     return $this->aResourceVersion;
 }