private function compositeToStdObject(ProcessableInterface $tree)
 {
     if ($tree->isAListOfTrees()) {
         return $this->listOfTreesToStdObject($tree);
     } else {
         return $this->namedTreeToStdObject($tree);
     }
 }
 /**
  * @param ProcessableInterface $message
  * @return array|string
  */
 private function buildCompositeMessageBody(ProcessableInterface $message)
 {
     if ($message->isAListOfTrees()) {
         $content = $this->buildListOfTreeBody($message);
     } else {
         $content = $this->buildChildrenTreeBody($message);
     }
     return $content;
 }