/**
  * Wrapper for QubitDigitalObject::importFromBase64() method
  *
  * @param string $encodedString base-64 encoded data
  * @param string $filename name of destination file
  * @return QubitInformationObject $this
  *
  * @TODO allow for different usage types
  */
 public function importDigitalObjectFromBase64($encodedString, $filename)
 {
     $digitalObject = new QubitDigitalObject();
     $digitalObject->usageId = QubitTerm::MASTER_ID;
     $digitalObject->importFromBase64($encodedString, $filename);
     $this->digitalObjects[] = $digitalObject;
 }