Neos\ContentRepository\Domain\Model\Workspace::getRootNodeData PHP Method

    public function getRootNodeData()
    {
        return $this->rootNodeData;
    }

 /**
  * This finds nodes by path and delivers a raw, unfiltered result.
  *
  * To get a "usable" set of nodes, filtering by workspaces, dimensions and
  * removed nodes must be done on the result.
  *
  * @param string $path
  * @param Workspace $workspace
  * @param array|null $dimensions
  * @param boolean $onlyShadowNodes
  * @return array
  * @throws \InvalidArgumentException
  */
 protected function findRawNodesByPath($path, Workspace $workspace, array $dimensions = null, $onlyShadowNodes = false)
 {
     $path = strtolower($path);
     if ($path === '' || $path !== '/' && ($path[0] !== '/' || substr($path, -1, 1) === '/')) {
         throw new \InvalidArgumentException('"' . $path . '" is not a valid path: must start but not end with a slash.', 1284985489);
     }
     if ($path === '/') {
         return [$workspace->getRootNodeData()];
     }
     $addedNodes = [];
     $workspaces = [];
     while ($workspace !== null) {
         /** @var $node NodeData */
         foreach ($this->addedNodes as $node) {
             if ($node->getPath() === $path && $node->matchesWorkspaceAndDimensions($workspace, $dimensions) && ($onlyShadowNodes === false || $node->isInternal())) {
                 $addedNodes[] = $node;
                 // removed nodes don't matter here because due to the identity map the right object will be returned from the query and will have "removed" set.
             }
         }
         $workspaces[] = $workspace;
         $workspace = $workspace->getBaseWorkspace();
     }
     $queryBuilder = $this->createQueryBuilder($workspaces);
     if ($dimensions !== null) {
         $this->addDimensionJoinConstraintsToQueryBuilder($queryBuilder, $dimensions);
     }
     $this->addPathConstraintToQueryBuilder($queryBuilder, $path);
     if ($onlyShadowNodes) {
         $queryBuilder->andWhere('n.movedTo IS NOT NULL AND n.removed = TRUE');
     }
     $query = $queryBuilder->getQuery();
     $nodes = $query->getResult();
     return array_merge($nodes, $addedNodes);
 }