Chris@0: The core/lib directory is for classes provided by Drupal Core that are original Chris@0: to Drupal. All Drupal-originated code must follow the PSR-0 naming convention Chris@0: for classes and namespaces as documented here: Chris@0: Chris@0: https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-0.md Chris@0: Chris@0: The vendor namespace for Drupal-originated code is "Drupal".